The OB1 Adventurer
The OB1 Adventurer
The OB1 Adventurer
The OB1 Adventurer
The OB1 Adventurer
The OB1 Adventurer
The OB1 Adventurer
The OB1 Adventurer
The OB1 Adventurer

The OB1 Adventurer

Regular price $2,999.00

DETAILS

AS SEEN IN 

Overview                 How It Works                  Specs                  Geometry                  FAQ

Go on an epic journey.

The OB1 Adventurer is for multi-day excursions on paved roads, dirt trails, and wherever else the journey takes you. Whether you’re riding to an overnight camp spot or the ends of the earth, this machine will get you there with speed, comfort, and reliability you can depend on.

With extra low gearing and a full suite of mounting points for bags, fenders, rear racks, extra bottles, and other accessories, the OB1 Adventurer is your trusted companion for exploring the world. And with today’s lightweight gear, you could ride for months while stopping only to refuel.

SHIPPING LEAD TIME (EST.): 12-16 weeks
WEIGHT: 18-20lbs

Notes: Bags, racks, and other accessories not included. Dropper post pictured is an optional add-on. We reserve the right to update specs at any time.

 

Why you'll love it

  • Extra low gearing for schlepping up the mountain, with a 38T chainring and 11-46T cassetteProvides 418% of gearing range with consistent steps between gears.

    Effective range is comparable to a traditional double with an 11-32 cassette (428%), but biased toward more low end for loaded climbing.
     to keep you spinning.
  • Ultra-Wide Carbon 650B wheels built for speed, strength, and durability at a race-ready weight. Their broad support lets you run 47mm WTB Byways at low pressures for comfort and traction in the rough.
  • Tubeless done right with high-volume tires matched to wide rims for easy set-up, fewer flats, greater efficiency, and an extra smooth ride.
  • 1x11 drivetrain allows simple up/down shifting with no cross-chaining, chain slap, or chain drop, with a cage-lock feature on the derailleur that makes it super easy to swap wheels or fix a flat.
  • Ergonomic handlebar with a flat top, shallow drop, and 10 degrees of flare for comfort on the tops and control in the drops.

Obsessive on the details

  • Wide, asymmetric, graphene-infused carbon tubeless rims use every technology available to deliver maximum stiffness, durability, and tire stability per gram.
  • A creak-free bottom bracket with oversized Japanese stainless steel bearings and a 2-piece aluminum shell that threads together for perfect alignment. We refuse to use the failure-prone press fits most brands use.
  • DT350 hubs offer tool-free serviceability and bombproof reliability in a lightweight package that’s widely regarded as one of the best in the industry.
  • Shock-absorbing bar tape and a remarkably comfortable saddle for all day riding.
  • Mounting points galore for bags, extra bottles, rear racks, fenders, bento, and any other gear you need for your all-day (or all-month) adventure.

Mounting points for all your gear

  • 2 bottle mounts in the front triangle
  • 1 bottle mount below the downtube
  • 1 bento mount on the top tube
  • 2 bottle/lightweight gear mounts on the fork blades
  • Front and rear fender mounts (seat stay bridge included)
  • Rear rack mounts (max 15kg)
  • Wide central clamping area on handlebar
  • Clampable aluminum seatpost (included even when dropper is added)


Note: For optimum performance, load your heaviest items in a frame bag secured in the main triangle.

Max weight of rider + gear: 120kg (264lb)

 


 


Add-Ons

700C Wheel Package
$1299

Convert your OB1 to a versatile one bike for every road in under two minutes. Optimized for road, cyclocross, and touring, our wide tubeless carbon 700Cs are some of the best in the business. Add the entire wheel package -- including wheelset, tires, cassette, rotors, tubeless tape, sealant, and valvestem -- for a limited early offer of $1299.

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Dropper Seatpost
$199

Our infinitely adjustable, shifter-activated dropper post is a total game-changer. Dropping the saddle out of the way allows you to shift your center of mass back and low while freeing your legs to act as suspension. The result is increased control, speed, and confidence over steep or aggressive terrain. (See Specs for more details.)

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How it works

OB1 arrives on your doorstep 20% assembled.

Why? There's a reason mechanics hate factory-assembled bikes: they don’t perform the way they’re meant to, and they’re prone to damaging or failing at crucial moments. Factory-assembled bikes are lower quality and end up being more expensive than getting your bike built by a local professional mechanic.

We think there's a smarter way. We save you the cost, deliver the unassembled parts directly from the factories to your doorstep, and let you support your local bike shop. Everyone wins.

Learn more

 

Ride every road that calls you.

The OB1 is a carbon bike with carbon wheels that hammers on road, shreds gravel, and has mounting points for all your travels. Its sleek endurance road geometry hides clearance for ultra-wide gravel tires and mounting points for racks, fenders, extra bottles, and bags.

By working directly with the top factories behind the world's leading bikes, we've created a traditionally $6000 bicycle for the revolutionary price of $2999.

Explore all OB1 build kits below:

THE ADVENTURER
$2,999

Go on an epic journey.

- 650B | 11-46T wheels
- 38T chainring


THE GRAVEL SHREDDER
$2,999

A mixed-terrain joy machine.

- 650B | 11-46T wheels
- 42T chainring

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THE ROADIE
$2,999

A speed weapon for every road.

- 700C | 11-42T wheels
- 46T chainring

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OMNI EDITION
$4,298

One bike. Two wheelsets. Unlimited possibilities.

- 700C | 11-42T wheels
- 650B | 11-46T wheels
- 46T chainring

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CUSTOM
Starting at $2,999

Select the wheelset(s), chainring, cassette, handlebar width, crank length, and stem length that are right for your body and terrain.

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Specs

Chassis    |    Cockpit    |    Drivetrain & Braking    |    Wheels


Every component has a story. No placeholder parts or marketing gimmicks here. Every detail, down to the bolts and bearings, is selected for the optimal balance of performance, durability, and serviceability. Click on the name of each component to learn more about why we chose it.

To learn more about our approach, check out how we built a high-end carbon dream bike for $2999.

 

CHASSIS

DETAILS

- Endurance road geometry
- Clearance for 650B x 47mm or 700C x 40mm tires
- Discreet mounting points for: (5) bottle cages, racks, fenders, bento, and clip-on accessories
- Clean internal routing for hoses and full cable housings, with foam sleeves sheathing for sound dampening
- Round, dropper-ready 27.2 seat tube
- Accommodates up to 46t single or 50/34t double chainrings
- Reinforced Toray 800/700 blend carbon construction
- Fiberglass anti-corrosive layer at seatpost, bottom bracket, and headset interfaces
- 1145g +/-5% (medium, black finish, frame w/o hardware)


Choice of: XS, S, M, L, XL (See Geometry)

WHY WE CHOSE IT

From road to gravel to travel, our OB1 frameset is ready for every road. Its sleek road-bike design hides clearance for wide dirt tires and discreet mounting points for bags, fenders, racks, extra bottles, and everything else the ride demands. From reinforcement at every hole and boss, to anti-corrosive fiberglass where carbon meets metal, to bolt-secured aluminum cable guides, we've invested in the details to deliver you performance without compromise.

DETAILS

- Steersafe -equipped carbon steerer
- Clearance for 650b x 47mm | 700c x 40mm tires
- Discreet bosses for fenders, racks, and (2) bottles
- 12mm thru axle dropouts
- Reinforced Toray 800/700 carbon construction
- 545g +/-5% fork, 45g SteerSafe (eliminates compression plug)

WHY WE CHOSE IT

We created SteerSafe to ensure your carbon steerer is fully supported against stem clamping forces. SteerSafe is an aluminum tube with built-in starnut that gets bonded into our carbon steerers at the factory. To shorten a SteerSafe equipped steerer, simply cut through the carbon and aluminum layers using a guide and a carbon-specific blade as you would a normal carbon steerer, then use ultra-fine sandpaper to create a smooth, slightly rounded edge. Finish by torquing the lubricated stem bolts to 5 Nm.

DETAILS

- Hollow bolt-on with 6mm hex head
- 12mm front | rear
- Thread length and pitch matched to OB1 frame/fork
- Machined 7075 aluminum
- 82g +/- 5% per set 

WHY WE CHOSE IT

Each thru axle is machined from a single billet of ultra-premium 7075 aluminum. With a built-in washer for smooth installation, our bolt-on thru-axles offer stiffness, security, and easy wheel removal without the extra ~100g of weight of levered designs and uses a 6mm hex wrench.

DETAILS

- Standard interface for even clamping
- Steel bolt & threaded insert for trouble-free adjustment
- Machined 7075 aluminum
- 20g +/-5%

WHY WE CHOSE IT

OB1's seat clamp achieves its integrated look while utilizing a traditional clamping interface that, unlike many proprietary integrated designs, evenly distributes clamping forces. This helps prevent damage to frame or post, post slippage, or post binding (dropper post). We finish it off with a lubricated nut and bolt for a lifetime of trouble-free use. Be sure to coat your seat post with grip paste before installing.

DETAILS

- Oversized 1-1/2" stainless steel angular contact lower bearing
- Standard 1 1/8" angular contact upper bearing
- Sealed upper cap
- Replaceable aluminum split crown race

WHY WE CHOSE IT

Selected for durability, OB1's extra large 1-1/2” angular contact lower cartridge bearing distributes the extreme loads this component experiences over more and larger balls. The sealed top cap provides an extra barrier to water penetration and its replaceable aluminum split crown race protects the carbon steerer crown from wear while being less prone to creaking than non-split races. While it adds a handful of grams relative to smaller diameter options, we don't believe in shedding weight at the expense of durability.

DETAILS

- 1-bolt replaceable
- Stiff for use with long-cage derailleurs
- Axle threads directly into the hanger
- Extra included just in case

WHY WE CHOSE IT

Flexy derailleur hangers compromise shifting and are quick to fail. OB1's is stiff and strong to withstand the greater loads placed on it by today's long-cage derailleurs and wide range cassettes, but will still sacrifice itself to protect the derailleur and frame in the event of a major impact. And don't worry - we include an extra just in case. 

Mounting points for all your gear:
- 2 bottle mounts in the front triangle
- 1 bottle mount below the downtube
- 1 bento mount on the top tube
- 2 bottle/lightweight gear mounts on the fork blades
- Front and rear fender mounts (seat stay bridge included)
- Rear rack mounts (max 15kg)
- Wide central clamping area on handlebar
- Clampable aluminum seatpost (included even when dropper is added)

Note: For optimum performance, load your heaviest items in a frame bag secured in the main triangle.
Max weight of rider + gear: 120kg (264lb)

 

COCKPIT

STANDARD SEATPOST
DETAILS

- 1-piece 3D forged 2014-T6 aluminum quill
- Micro-adjustable 2-bolt clamp
- Broadly supportive lower clamp
- 0 offset to match OB1's 73° seattube angle
- 230g +/-5% (400mm), 210g +/-5% (350mm)

WHY WE CHOSE IT

OB1's seatpost weighs less than some carbon posts yet is safe to use with clamp-on accessories like bikepacking seat bags. Its quill is forged from a single billet of ultra-premium 2014-T6 aluminum for excellent strength to weight. The 2-bolt head and oversized lower clamp plate offer superior saddle security, support, and micro-adjustability. 

This seatpost can be shortened using a standard steerer cutting guide and 32TPI hacksaw blade. Just be sure that there's at least 105mm of insertion into the frame (more is better) and that you sand or file the cut edges to round them off and remove burrs.

OPTIONAL ADD-ON:  DROPPER SEATPOST  (+$199)
DETAILS

- Infinitely adjustable
- Premium 7075-T651 aluminum construction
- 1-piece forged upper with 2-bolt head
- Clean integrated cabling
- Proven, serviceable design
- Replaceable cartridge
- On 1x11 bikes, front shifter is free to actuate the dropper
- On 2x11 bikes, a separate lever (included) is required
- 495g +/-5% (405/105) + 90g cable set

Choice of: 405 and 360mm lengths

IMPORTANT: Dropper posts have a limited adjustment range and available options may not work for all riders (particularly those on smaller frames). Please check fit guide before selecting.

WHY WE CHOSE IT

A dropper post is a total game-changer. Dropping the saddle out of the way allows you to shift your center of mass back and low while freeing your legs to act as suspension. The result is increased control, speed, and confidence over steep or aggressive terrain. They're even great for fast road descents. We've been riding droppers on our drop-bar bikes since before it was cool, so whether you're looking to get shreddy off-road or just want to feel safer on that downhill sweeper, a dropper is an option well worth considering.

DETAILS

- 116mm drop | 75mm reach | 10 ° flare
- Comfy flat top sections
- Wide 100-180mm x 31.8mm clamp area
- Double butted 6061 aluminum

Choice of: 360, 380, 400, 420, 440mm widths (center-to-center at the hoods)

WHY WE CHOSE IT

Aero on the tops, control and comfort in the drops. With a short reach, shallow drop, and subtle 10° of flare, our handlebar keeps you narrow when motoring on the hoods while offering greater leverage when cornering, descending, or shredding dirt in the drops, all while reducing back and wrist strain. Its wide central clamping area allows you to attach a bell, GPS, bar bag, aero clip-ons, or all 4 at once if that's what your adventure requires.

DETAILS

- 3D forged 7050 aluminum
- 7° angle
- 105g (100mm)

Choice of: 70, 80, 90, 100, 110, 120 mm lengths

WHY WE CHOSE IT

A top-of-the-line stem equivalent to others retailing at $100 or more, our 7050-series aluminum stem is strong and stiff yet lighter than others' $250+ carbon stems.

DETAILS

- 148 width
- 244 length
- Wide, supportive nose
- Pressure relieving padding and cutout
- Hollow Cr-Mo rails
- 261g +/- 5%

WHY WE CHOSE IT

Wide, short, cut-out saddles like Velo's VL-1966 first gained popularity amongst triathletes and time-trialists looking for improved comfort over long stints in extremely aggressive positions. Eventually roadies and mountain bikers discovered their benefits and brought them into those disciplines as well. We went with hollow Cr-Mo rails because they are stronger than Titanium and only 8g heavier.

While this saddle has been universally loved by our testers, every backside is different. Saddle comfort is a game of millimeters and fractions of a degree, and we recommend you invest in a proper fit to get it right.

 

DRIVETRAIN & BRAKING

DETAILS

- Narrow-wide
- Direct mount for stiffness, weight, & easy swapping
- Long-wearing 7075 aluminum
- Standard SRAM-type 3-bolt interface | 6mm offset
- 99g +/-5%

WHY WE CHOSE IT

Machined from a single plate of long wearing 7075-series aluminum to eliminate every unnecessary gram, our chainrings feature contoured narrow-wide teeth for smooth, drop-free operation and direct-mount interfaces for a stiffer and lighter overall system.

DETAILS

- 11 evenly-spaced, slick-shifting cogs
- 418% range with plenty of low-end
- Long-wearing steel with 7075 aluminum outer cogs
- Aluminum carriers
- 465g +/-5%
- Note: 11-46T requires use of included spacer

WHY WE CHOSE IT

Lightweight, slick-shifting, and durable, we've been rocking 1x11 drivetrains using these premium Sunrace cassettes for years to great effect. Simpler and more reliable than a 2x11 system, 1x drivetrains have the added benefit of freeing up your front shifter (standard on all OB1s) to actuate a dropper post for some tongue-out gravel shreddery. With proper chain maintenance, you'll get thousands of miles of trouble-free use before needing a replacement.

DETAILS

- Clutched to prevent chain slap or drop
- Cage-lock for exceptionally easy wheel removal/swapping
- Long-wearing cartridge bearing pulleys


WHY WE CHOSE IT

Functionally identical to Force 1 except for its aluminum vs. carbon front cage plate (~8g), SRAM's Rival 1 long cage rear derailleur features worthwhile upgrades over Apex 1 that include more durable cartridge bearing pulleys and a 50g+ lighter weight. It's clutched main pivot prevents chain slap and drops when charging through rough terrain, and its clever cage-lock feature makes swapping between wheelsets a breeze.

DETAILS

- Hydraulic braking
- Flat-mount dual piston calipers
- Adjustable reach
- All OB1s come with front and rear shifters

WHY WE CHOSE IT

SRAM uses the same internals across all its road lines to achieve identical pro-level shifting and braking performance. With the only relevant differences being weight and finishes, we skipped Force's carbon levers (42g difference) and invested in high-end carbon wheels, lightweight cockpit components and other performance. durability, and serviceability upgrades while saving vastly more weight. While Rival and Apex are identical except for finishes, we went with the former due to it's availability with a front shifter to allow easy addition of a dropper post or front derailleur.

We discovered and have rigorously tested a simple, reversible hack that allows SRAM front shifters to swing freely for use with a dropper post. We'll publish a how-to video before your OB1 ships.

DETAILS

- Stiff, hollow box-section arms
- Lightweight & tough 7075 aluminum
- Wide-stance BB386 spindle (30 x 86.5mm)
- SRAM-type 3-bolt direct mount chainring interface
- 1-bolt removable drive-side arm
- Compatible with 4iiii power meters
- 625 grams (172.5mm)

Choice of: 160, 165, 170, 172.5, 175mm

WHY WE CHOSE IT

Strong, Stiff, Light: Pick 3. How do you create a crank that achieves extraordinary stiffness-to-weight in an easily serviceable package that isn't afraid of a rock strike? Take two billets of ultra premium 7075 aluminum. Smash each under 600 tones of force to form two hollow, box-section arms. Then take another billet of that same alloy and machine it into a large diameter BB386 spindle to push the bottom bracket's oversized bearings as far apart as possible for even more stiffness and durability. Sandblast rather than polish all surfaces to pound-out microfractures, machine out required interfaces, and anodize everything for an even harder and longer-wearing finish. On the non-drive side, press the spindle directly into the arm to reduce weight. On the drive side, use a single oversized bolt to cinch the burly spline interfaces of the arm and spindle together for easy crank removal and chainring swapping.

DETAILS

- Precision-milled aluminum shell
- Premium stainless steel sealed cartridge bearings
- Wide BB386 bearing stance

WHY WE CHOSE IT

Cheap plastic "Press Fit" bottom brackets need to die. Bottom brackets experience extreme loads under harsh conditions. Yet despite years of complaints, many companies are still pressing cheap plastic "Press Fit" or "PF" BB shells directly into their frames to cut cost without you noticing. This practice predictably results in poor bearing alignment and support, increased friction under load, accelerated wear, creaking, and in extreme cases even irreparable damage to the frame.

Our precision-milled aluminum bearing cups thread into each other to create a stiff, robust, and perfectly aligned shell to support our widely-spaced, large-ball cartridge bearings. It's the same $70+ solution that mechanics turn to when others' Press Fit BBs fail. Sure, it adds a few grams and quite a bit of cost, but the result is an efficient-under-load, durable, and easily serviceable BB that won't let you down.

DETAILS

- 114 link
- Quick master-link
- 259g

WHY WE CHOSE IT

This chain gets the job done with neither fanfare nor fuss. Designed by SRAM to work with all their 1x11 drivetrains, the workhorse PC1110 shifts and wears as well as far more expensive models. Keep it clean, treat it regularly with a wax-based lube, and replace it the moment your checking tool (you do have one, right?) indicates elongation in order to keep your drivetrain quiet, your shifts snappy, and your relatively expensive chainrings and cassettes free of premature wear.

DETAILS

- Stainless steel
- 160mm front | rear
- Centerlock

WHY WE CHOSE IT

SRAM's Centerline 160mm rotors offer a blend of power, modulation, smooth operation, and heat-management. We chose a Centerlock interface for easier installation and removal.

 

WHEELS

THESIS Ultra-Wide Carbon 650B Wheels

DETAILS

- 650B | 27.4mm internal | 33mm wide | 24.5mm deep
- Optimized for 47mm+ tires
- Tubeless-ready hookless design, also compatible with standard tubed tires
- 3mm offset, angle drilling, & reinforced nipple seat
- Toray 700/800 construction
- 370g +/- 5%

WHY WE CHOSE IT
An adventure-lover that's optimized to support popular 47mm gravel tires at low pressures, our Ultra-Wide Carbon 650B rims offer maximumized tire volume for compliance, traction, and stability in the dirt. They feature 3mm of offset, angled spoke hole drilling, and a reinforced nipple seat for high and balanced spoke tensions, which in turn create a stiffer, stronger, and more durable wheelset.  Their hookless design improves impact strength and tire stability at low pressures. With a bias toward comfort and traction, these rims are great for technical gravel, bike-packing, speed commuting, and speed touring.
DETAILS

- WTB Byway 650B x 47mm
- Supple skinwall casings
- 525g

WHY WE CHOSE IT

A gravel grinder that can hang with the roadies on the way to the trail, WTB's Byway is a dirt-lover's dream. They inflate to around 49mm on our ultra-wide 650B rims and are best at 25-55psi depending on your weight and terrain.

DETAILS

- Famously bombproof 18T star ratchet engagement system
- (4) premium 6902 sealed cartridge bearings
- Centerlock rotor interface
- 28 hole J-bend flanges
- 12 x 142mm thru axle
- 267g +/- 5%

WHY WE CHOSE IT

Extreme loads and environmental stresses make rear hubs notoriously prone to failure. That's why we invested in DT Swiss's rightfully venerated DT350 rear hub. It features the famously strong and durable Star Ratchet engagement system, large 6902 sealed cartridge bearings, tool-less serviceability and convertibility to other axle or freehub standards, and a centerlock interface for easy rotor installation and removal.

This hub is twice as strong and 3-5x more expensive than the traditional pawl-based models some brands employ to reduce cost, and weighs a few grams more than the under-built models often employed to achieve attention grabbing weights at the expense of durability. 

Don't be fooled. We've reviewed the testing data, talked to mechanics, and have been abusing DT Star Ratchet hubs ourselves for over 15 years. Whether you're ripping it up on singletrack, touring through some remote wilderness, or simply putting in long miles year after year, these are the hubs you'll want to trust to keep you going.

You can learn more about DT's Star Ratchet engagement system here.

 

DETAILS

- (2) premium 6802 sealed cartridge bearings
- Centerlock rotor interface
-  28h J-bend flanges
- 12 x 100mm thru axle
- 136g +/- 5%

WHY WE CHOSE IT

DT350 front hubs are famously durable, serviceable, and adaptable. They also achieve their light weight without resorting to durability-compromising tricks. What do we mean? Just as there are brands that will use failure-prone aluminum nipples to shave grams, there are others who may spec a hub with tiny bearings and a narrow hub shell to achieve an eye-catching weight. However, those small bearings wear out fast, and that narrow shell may not withstand the torsional loads associated with disc brakes.

DETAILS

- Cold forged
- Aero bladed
- Wind-up resistant
- Sandvik T302+ stainless
- J-bend
- 2-cross
- 4.3g each

WHY WE CHOSE IT

Why invest so much on so many fancy bladed spokes? Because the same cold-forging process that turns a length of round straight-gauge wire into a light and aero bladed spoke also improves strength-to-weight and elastication by realigning the grain flow of the metal and reducing its cross-sectional area. The result is a spoke that can be run at high tension while experiencing less change in tension and thus fatigue with each wheel rotation or impact. Furthermore, unlike cheaper round "butted" spokes that are in fact cold-forged in a similar process, bladed spokes can easily be built into a wheel and later trued without inducing spoke wind-up, further extending the life of the wheel. To cap it off, we went with J-Bends because they're easier to find should one fail, and avoided low spoke counts to make it unlikely you'll ever have to.

DETAILS

- Durable brass
- Resist seizing, splitting, & other failure modes
- Can be trued with tires and rim-tape in place
- 1g each

WHY WE CHOSE IT

Why do mechanics love externally adjustable brass nipples? Aluminum nipples are a trick used by some brands achieve attention-grabbing weights at the expense of durability and serviceability. Aluminum oxidizes and is much softer than brass, making aluminum nipples notoriously prone to seizure, splitting, and failure. The result is that a simple wheel true can turn into a costly rebuild with new nipples and spokes. Weight savings? Less than 18 grams per wheel.

As for the hidden nipples used by some uber expensive brands, no one envies having to remove your tires, sealant, & rim tape to make even minor adjustments. Aerodynamic advantage? Zero. Zilch. Nada.

DETAILS

- Each wheel is built by a single, skilled professional
- 2-cross lacing for lateral and rotational strength
- 28 spokes for durability and stiffness

WHY WE CHOSE IT

Strong, durable wheels require more than the best components. That's why we invested having our wheels professionally hand-built and machine checked. With a professional touch-up at 1200 miles and regular check-ups for tension and true, our wheels will continue to perform year after year.

 

Have a question? Check out our FAQ or reach out to us directly at support@thesis.bike to talk to a real human. We're always happy to talk bikes.
 

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Geometry

 

 

 

 


Need help determining size and fit? Our friends at Geometry Geeks make it easy to compare the OB1 with your current bike.

Compare

Frame Size XS
(48)
S
(51)
M
(54)
L
(57)
XL
(60)
A Reach 356 363 378 388 403
B Stack 521 551 571 595 614
C Head Tube 110 138 155 180 200
D Effective Top Tube 515 531 547 570 591
E Wheelbase 987 995 1007 1025 1046
F Front-Center 578 586 598 616 637
G Head Tube Angle 70° 71° 72° 72° 72°
H Fork Offset 51
I Fork Axle to Crown 385
J BB Drop 73
K Chain Stay 420
L Seat Tube Angle 73°
M Seat Tube 440 470 500 530 560
Standover Height 720 750 775 805 835
Max Exposed Steerer 90
Stem Length 70 90 100 100 110
Crankarm Length 160 165 170 172.5 175
Handlebar Width* 380 400 420 420 440

All figures in millimeters unless otherwise indicated.
*Center to center at hoods

 

Dropper Post Sizing Chart XS
(48)
S
(51)
M
(54)
L
(57)
XL
(60)
Dropper Option 1: 360mm
Length/Travel 360/90
Seatpost Min Insertion - 140 140 140 140
Frame Max Insertion - 188 197 197 197
Min Saddle Height** - 692 713 743 773
Max Saddle Height** - 730 760 790 820
Dropper Option 2: 405mm
Length/Travel 405/105
Seatpost Min Insertion - - 160 160 160
Frame Max Insertion - - 208 229 229
Min Saddle Height** - - 752 761 791
Max Saddle Height** - - 790 820 850

**From center of bottom bracket at full extension using our stock saddle. Exact figures depend on saddle's positioning and rider's positioning on it. Other saddles may have different stack heights. Please choose the option (if any) that puts you closest to the upper middle of the min-max saddle height range. Because of the number of variables involved, we cannot guarantee that riders at the extremes of these ranges for a given dropper/frame combination will be able to achieve optimal fit. Please contact us after purchasing if you are uncertain and we'll help confirm or modify your order as needed.

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Questions? Get a one-on-one consultation.

We know that finding the perfect bike can sometimes be overwhelming. That's why we offer free personal OB1 consultations over email, phone, video, and in person.

Have a question on fit? Need help choosing the right build kit or configuration for how you ride? Let us help. We'll treat you like a friend and help you find the best bike for your needs, regardless of who makes it.

To get started, schedule a phone call or drop us a note at hello@thesis.bike.

Book a consultation

 


 

What they're saying

“Remarkable.” - Bikerumor

“A highly attractive build.” - Gravelstoke

“I’m a typical, skeptical mechanic. I’ve worked on and ridden every gimmicky bike in the book. I've never seen one this well thought out.” - Aaron C.

“Damn it. I don’t want to ride my regular bike now.” - Andy R.

Grab a test ride



 

How we built a high-end carbon dream bike for $2999

Direct from the factory

The bicycle industry is pretty old school, and that means a lot of middlemen. We skip the middlemen and work directly with the top manufacturers behind the leading brands. That's how we cut the price in half.

Every component matters

No placeholder parts, marketing gimmicks, or corner-cutting. If we wouldn't put it on our own bikes, we won't put it on yours. We built the OB1 like a mechanic would: for performance, serviceability, and durability.

See our approach

 

Direct from top factories

Every component matters

Radical inclusion

30 day return policy

No bull crash replacement

Personal one-on-one consults

 

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Have a question we didn't answer below? Drop us a note at support@thesis.bike. We're always happy to talk about bikes.

The OB1

Since weights will vary depending on frame size, build and other selections, here are a few examples and their weights:

  • 18.5lbs: Size L, raw black carbon frame, 1 x 11, 11-42T, standard seatpost, 700C wheelset
  • 19.9lbs: Size M, painted frame, 1 x 11, 11-42T, dropper seat post, 650B wheelset
  • 20.0lbs: Size L, raw black carbon frame, 1 x 11, 11-46T, dropper seat post, 650B wheelset
650B x 47mm, or 700C x 40mm. The OB1's 650B x 47mm WTB Byways sit almost 50mm wide on our 27.3ID rims and offer just over 4mm of chainstay clearance. We know of at least two knobbier options in this size that will be available soon, and we've run the slightly wider 48mm Panaracer Gravel King SKs without issue.  Some tires marketed as 700C x 42mm may also work, and we'll update this section once we've had an opportunity to test them. And don't worry: the 700C x 30mm road slicks that come standard on our aero-wide road rims look great in the frame (they sit 31mm and have the same outer diameter as the 650B x 47mm option) and the rims are plenty wide enough to support the biggest tires that will fit in the frame.
The Pantone code of the warm red frame is "Warm Red C" and the electric blue is "801 C".
You may have noticed that some of our scenery photography is left over from our prototype bikes and shows bikes with blue decals. Our final production bikes will look very close to what you see with the white background photos (here's an example), featuring silver reflective decals and our updated logo that you see at the top of this website.

- 2 bottle mounts in the front triangle
- 1 bottle mount below the downtube
- 1 bento mount on the top tube
- 2 bottle/lightweight gear mounts on the fork blades
- Front and rear fender mounts (seat stay bridge included)
- Rear rack mounts (max 15kg)
- Wide central clamping area on handlebar
- Clampable aluminum seatpost (included even when dropper is added)

Note: For optimum performance, load your heaviest items in a frame bag secured in the main triangle.

Max weight of rider + gear: 120kg (264lb)

Pretty darn easy. It takes less than 90 seconds. See it in action below:

OB1 Assembly and Fit

Factory assembled bikes are often poorly put together and rarely fit right out the box. Investing in a frame up build and fit by a local professional results in a more comfortable, better performing, and longer lasting bicycle. That’s why we ship your OB1 to you 20% assembled and pass on the savings. And here’s the crazy thing: once all costs are factored in, you actually end up spending less for a bicycle built right for you.
We strongly recommend bringing your OB1 to a member of the Professional Bicycle Mechanics Association. PBMA's certified mechanics and fitters are some of the best in the business. A typical professional build and basic fit will usually run between $200-$329, with an advanced fit running more. You can also work with your favorite local bike shop.
If you’re a professional bicycle mechanic, absolutely. Otherwise, we very strongly recommend you to work with one (see "How do I find a mechanic to assemble my bike?" above). Building a high-end bicycle from the frame up requires specialized skills, tools, materials, and techniques. Improper assembly can result in premature wear, component failure, a crash, injury, and even death. There is no better performance enhancer than a professional build and fit, and no better insurance against a broken body or bike. We require you to sign a waiver acknowledging that you are either a professional bicycle mechanic, are bringing your OB1 to a certified and insured mechanic or shop, or accept the risks of not doing so.
While this is not an option today, we are considering it for the future. This may include partial assembly (where we tackle the hard stuff like installing and bleeding brakes) or a more standard 90% assembly. Either way, we'll be investing in having it done by a certified professional mechanic. All that said, there really is no more effective investment in performance, comfort, durability, and safety than a build and fit with a local professional. And it’s actually more cost-effective than if we offered it as a generic factory-assembled bike (see "Why does the OB1 come 20% assembled?" above). That’s why we’ll always recommend the 20% assembled bike for our personal friends. We’re also exploring future partnerships with service providers who will do a professional build and fit for you.

Customizing Your OBI

Yep. Right here.
Let’s get you an amazing fit. If you find that you need a different size for your stem, crank, or handlebar, drop us a line at support@thesis.bike and we’ll get you a replacement at a reasonable price.
Yes you can! We offer a “custom paint” option at checkout for +$199. Just give us the Pantone number of the color you love. Note that U colors are uncoated, and C colors are coated. We highly recommend using a physical Pantone color guide to choose your color, as it often differs significantly from what you see on your screen.
Lucky for you, our standard “Black Carbon Matte” finish doubles as a primer for custom paint. And because your frameset comes unassembled in its own box, your painter won't have to strip off all the parts before getting to work. We'd love to see what you come up with, so please send us photos. :)
There's a good chance we can help. Drop us a line at support@thesis.bike with the build you have in mind to get started.
Based on feedback from a number of customers, we decided to remove the SRAM Rival 2x11 drivetrain option. We are actively exploring an even better replacement.

The original OB1 was created with a point of view on 1x drivetrians. While it may seem counter-intuitive to riders coming off traditional road bikes, we see 1x drivetrains as having a number of advantages and few disadvantages relative to 2x. These include:
    • Simple up/down shifting with no cross-chaining or chain-rub.
    • Simpler set-up, calibration, and servicing.
    • Clutch mechanism on the rear derailleur virtually eliminates chain slap/drop (a real issue on dirt).
    • Cage-lock feature on SRAM's 1x rear derailleurs makes for easy swapping between wheelsets.
    • The front shifter (standard on every OB1) is freed up to actuate a dropper post, making for a far more ergonomic and intuitive cockpit.
    • Gearing range can be calibrated upward or downward simply by swapping in a different chainring (note: may also require re-sizing or replacing your chain).
    • Less expensive up front and over the life of your bike.

As 1x11 gearing range is comparable to a typical 2x11 drivetrain, the only potential downside of 1x11 is larger jumps between cogs. We've found that most riders adjust to this almost immediately, particularly those who mountain bike (most mountain bikers ditched the front derailleur long ago).

OB1 Maintenance

Clamping a dropper is not recommended and can damage the post. Same is true of hanging a dropper-equipped bike by its seat.
Lightweight saddlebags are generally fine as long as they attach only to the saddle rails and do not interfere with the operation of the dropper through its full travel. Large and heavy seat bags are not recommended.

Wheelsets

650B x 47mm, which sit almost 50mm wide on our 27.3ID rims. We’ve also run the 48mm Panaracer GravelKing SKs with no issues, though they sit ~51mm and thus have a smidge less than our 4mm of recommended clearance. Because 650Bx47mm tires have the same radius as 700Cx30mm, handling remains constant when swapping wheelsets (except, of course, for differences related to the tires themselves).

700C x 40mm. The 22ID rims are aero-optimized for 28-30mm slicks but offer a wide base of support for running higher volume tires at low pressures without inducing tire squirm. Some 42mm tires will also fit, but we’ve not yet tested them and riders on smaller frames may experience toe overlap issues. Note that clearing larger 700C tires would have required a longer/slacker geometry, thus compromising handling.

Yep. Our wheelsets are carefully hand-built by a professional mechanic.

Shipping, Returns, and Warranty

By skipping the middlemen in the traditional bike industry, we cut the price of a high-end carbon bike in half. You can learn more on our blog post How we created a high-end carbon dream bike for $2999.
We generally ask folks to expect 8-12 weeks, though you can see latest shipping time status here. This is because your customized bike is “made to order”, and because minimizing inventory sitting in warehouses is part of what brings the OB1 from over $6000 retail down to $2999. We expect to reduce lead times as we grow.
Shipping is a flat $99. At the time of this writing, taxes are only charged for delivery addresses in the state of California (7.25% for the state, potentially additional for your city or county).
For standard bikes, we allow a full refund within 30 days of delivery for new and unopened products. Please see our Return Policy for more details.
Yep. Please visit our Warranty page for full details.
Rather than heavily marking up our products and then offering “discounted” crash replacements, we’re proud to give you the same direct pricing at all times. If you need a replacement part not already listed on our website, we’ll do our best to get one to you at a similarly outstanding value. Contact us at support@thesis.bike to get started.
At the moment, the OB1 is available in the United States. We are exploring expansion into other countries for 2019. Send a note to support@thesis.bike if you'd like to request for your country to be added to the list. We'll be prioritizing by the number of requests we see.

In the meantime, we've heard that folks outside the US are shipping to friends and relatives in the US. We're also offering pickup orders from our workshop in San Francisco if you don't have a US address. Just contact us if you'd like to pick up your order from our workshop.
Awesome! For group sales, reach out to us at hello@thesis.bike.
Yes! Once you add an item to your cart, instead of hitting "check out", you will see a PayPal button underneath it. Once you log in to PayPal, it will offer you several options for paying, and at the bottom, you'll see a purple box for PayPal Credit. It offers no interest if paid in full in 6 months. We're working with other vendors for more financing options in the future.

 

Have a question we haven’t answered yet? Send a note to support@thesis.bike and we'll take care of you.

 


 

Introducing the OB1

One bike, every road, no compromises. It's the dream bike we built for ourselves, and we're sharing it with you.

Meet the OB1

 

Return Policy  |  Component Swapping Program  |  No Bull Crash Replacement  |  Warranty


We’re in this together.

We care deeply about your ride experience. Honesty, integrity, and fairness are core to our thesis, and we strive to live by the adage of “treat others the way you want to be treated”.

That being said, we’re all human, and we may not always get it right. If that happens, we promise to do our best to make it right.

Whenever you have questions or issues, feel free to reach out to us at support@thesis.bike. Let’s figure this out together.

- Randall and Alice, Founders


Return Policy

You may return new, unused, unassembled products purchased from us within 30 days of delivery for a full refund minus the cost of shipping. The following terms apply to each such return:

  • New, unused, unassembled products must be returned in the same condition in which you received them, and with the original box and/or packaging intact, including manufacturer tags where applicable.
  • If your shipment came in multiple boxes, the 30 day window will begin from the day you received your last (most recent) box.
  • If your product was damaged in transit before you received it, you have 7 days from time of receipt to inform us of any damage. 
  • We do not accept returns on assembled products, modified products, used products, or products ordered with custom paint.

To start the process for a return, please contact us at support@thesis.bike. You must have written confirmation from us before shipping any return packages.

 


Component Swapping Program

Let’s get you an amazing fit. If you find that you need a different size for your stem, crank, or handlebar, drop us a line at support@thesis.bike and we’ll get you a replacement at a reasonable price.

 


No-Bull Crash Replacement

Rather than heavily marking up our products and then offering “discounted” crash replacements, we’re proud to give you the same direct pricing at all times. If you need a replacement part not already listed on our website, we’ll do our best to get one to you at a similarly outstanding value. Contact us at support@thesis.bike to get started.

 


Warranty

ACKNOWLEDGMENT OF ASSEMBLY RESPONSIBILITY
Your THESIS bike was delivered to your shipping address 20% assembled. By purchasing a THESIS bicycle, you understand it is 20% assembled and that improper assembly can result in product damage or failure that may lead to injury or death. You agree to choose and pay for a qualified and insured professional mechanic for frame up assembly, or else that you are a qualified professional mechanic assembling it yourself. You further agree not to hold THESIS liable for any damages resulting from assembly.

COVERAGE
Every bike purchased from THESIS is covered under our limited warranty program. The program grants a five (5) year limited warranty for the frame and fork, starting from the date of purchase, for the original purchaser against manufacturing and/or workmanship defects under normal and intended use.The program grants a two (2) year limited warranty for all other components, starting from the date of purchase, for the original purchaser against manufacturing and/or workmanship defects under normal and intended use.

Certain components may have limited warranties of their own that are offered by the component manufacturer, in which case we will refer you to the component manufacturer for service.

If a valid claim is received within the warranty period, THESIS will choose to either repair the product at no charge, using new or refurbished replacement parts; or replace the product or part with a new one that is at least functionally equivalent to the original product. The original of any product or component that is replaced under warranty must be returned to THESIS and becomes THESIS property.

For warranty service or questions, please contact THESIS at support@thesis.bike. Do not return your bicycle to THESIS without first speaking with our staff and obtaining a written return authorization. Please have your receipt or proof of purchase ready. You are responsible for the cost of shipping warranty returns to THESIS and return shipping to your address.

Non-covered events in the warranty include, but are not limited to:

  • improper assembly;
  • paint damage, fading or changes in color;
  • crashes, misuse, or neglect;
  • normal wear and tear;
  • modifications to frame, fork, or components;
  • mounting and alteration of additional components that were not expressly approved by us or replacement of our original components by components that do not have a similar quality;
  • improper use;
  • or excessive load.

The THESIS limited warranty does not include consumables or normal wear and tear parts, such as chain, cables, bar tape, chainrings, cassettes, pulley wheels, bearings, gears cables, tires, saddle covering, and brake pads.

SHIPPING DAMAGE CLAIMS
Please immediately inspect your product(s) for damage. We will not accept shipping damage claims later than 7 days from receipt of product. Take pictures of any damage that is found, and date the images when possible. Keep all packaging and paperwork until the inspection process is complete. Please contact support@thesis.bike to get started.

ADDITIONAL TERMS
The THESIS limited warranty as stated in this document provides the sole and exclusive remedy in lieu of all other of all other rights and remedies, including but not limited to implied warranties, contract rights, tort, negligence, strict liability, and other remedies expressed or implied at law or in equity. In no event shall THESIS be liable for special, indirect, incidental, economic or consequential damages, loss or damage to property other than the product itself, loss of use of property, loss of profits, business interruption, punitive damages, contribution, indemnification, or other losses, whatever the cause, including the fault or negligence of THESIS. If any part of this Limited Warranty is deemed to be not legal or enforceable, the remainder shall be given full force and effect.

CLAIMS TO BE RESOLVED BY ARBITRATION / WAIVER OF CLASS ACTION AND JURY TRIAL
If you have a claim against us, you agree that it will be resolved by binding arbitration brought before a single, neutral arbitrator in the State of California, County of San Francisco. Without your agreement to binding arbitration, we would be unable to provide our products and services to you on the same terms. Your agreement to binding arbitration means that you give up your right to sue us in a court of law, except that you may bring a claim in small claims court if your claim qualifies to be heard there. Any arbitration will be conducted and governed by the California Arbitration Act. You also agree not to bring a class action suit against us, and we each waive any right to a jury trial in any dispute. The above does not preclude any party from bringing an action to such equitable relief, if that is the only available appropriate relief under the circumstances.

BY ACCEPTING THESE TERMS, YOU ACKNOWLEDGE AND AGREE THAT YOU ARE WAIVING YOUR RIGHT TO A JURY TRIAL AND ANY RIGHTS YOU MAY HAVE TO BRING ANY CLAIMS ON A CLASS OR REPRESENTATIVE ACTION BASIS.

APPLICABLE LAW
The laws of the State of California and federal law, to the extent applicable, govern the use of the Sites and these Legal Notices without reference to choice of law provisions. Any claim which qualifies to be filed in a court of law will be heard exclusively in the state or federal courts located in the State of California, County of San Francisco.