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
The OB1 Adventurer
The OB1 Adventurer
The OB1 Adventurer

The OB1 Adventurer

Regular price $3,299.00

DETAILS

AS SEEN IN 

Overview                  Specs                  Geometry                  FAQ


For the explorers who disappear not just for hours, but for days. It’s all the best capabilities of our Shredder, but geared even more forgivingly to enable difficult climbs even when your bike is loaded with all the gear you need for overnight adventures. Bikepacking fanatics love this variation, as do our friends who live in more mountainous terrain. And of course, when the bags are off and you’re out for a quick jaunt, it’s still quick, nimble, and fun to ride.


Lead time: 4-8 weeks
Arrives 90% assembled (see prep guide)
Here's how it works and why it's worth the wait.


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, 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 mounts on the fork blades
  • Front and rear fender mounts (seat stay bridge included)
  • Wide central clamping area on handlebar


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

Max weight of rider + gear: 115kg (254lb)

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.

 


 

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.

 

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 mounts on the fork blades
- Front and rear fender mounts (seat stay bridge included)
- Wide central clamping area on handlebar

Note: For optimum performance, load your heaviest items in a frame bag secured in the main triangle.
Max weight of rider + gear: 115kg (254lb)

 

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.

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
- Front-shifter actuated
- 495g +/-5% (405/105) + 90g cable set

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 this one first gained popularity among 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 their disciplines as well. With a bit more cushion for mixed terrain riding and hollow Cr-Mo rails for outstanding strength, this is a saddle meant for long days on rough roads.

We spec our Endurance 148 saddle across our entire line of bikes. Our riders love it so much that many have outfitted their entire stable with them.

 

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: 155, 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.
 

Shop now

 


 

Geometry

 

Need help finding the right size? Check out our sizing guide.

Frame Size XS S M L XL
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 (Midpoint of TT) 720 750 775 805 835
Default Handlebar (C-C) 380 400 420 420 440
Default Stem (7°) 80 90 100 100 110
Default Crankarms 155 160 165 170 175
Default Seatpost 350 350 400 400 400
Dropper Seatpost
Default Length | Travel 315 | 70 360 | 90 360 | 90 405 | 110 405 | 110
Default Saddle Height Range 610 - 660 660 - 735 690 - 720 735 - 820 765 - 850
Alternate Length | Travel 360 | 90 315 | 70 405 | 110 360 | 90 360 | 90
Alternate Saddle Height Range 650 - 705 640 - 690 705 - 790 720 - 795 750 - 825


All figures in millimeters unless otherwise indicated.

 


 

What they're saying

“Unbeatable.” - CyclingTips

“Remarkable.” - Bikerumor

“I went through everything and climbed a ton. Mud. Ice. Road and gravel. It really is fantastic. Many miles of smiles.” - Joe C., Thesis rider

“I’m blown away at the ride quality and the handling of this gravel grinding machine. I’ll definitely be taking this bike on some adventures.” - Kevin B., Thesis rider

Grab a test ride

 


 

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

 


 

Explore our other setups

No matter how you ride the Thesis OB1, it's an unbeatable gravel bike. Choose one of our popular curated setups with the perfect wheelset + gearing for you, or design a custom OB1.

Each setup allows the OB1 to take on a completely new personality without altering its high-performance soul. Find the one that’s right for you below.

THE ADVENTURER
$3299

For the explorers who disappear not just for hours, but for days.

- Wheels: 650B carbon wheels // 47mm tires
- Gearing: 38T chainring // 11-46T cassette


THE SHREDDER
$3299

Our most popular option, born and bred for gravel.

- Wheels: 650B carbon wheels // 47mm tires
- Gearing: 42T chainring // 11-46T cassette

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THE ROADIE
$3299

Hold your own on the group ride, then take the long way home through the woods.

- Wheels: 700C carbon wheels // 30c tires
- Gearing: 46T chainring // 11-42T cassette

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OMNI EDITION
$4698

One bike. Two wheelsets. Unlimited possibilities.

- Wheelset 1: 700C carbon wheels // 30c tires // 11-42T cassette
- Wheelset 2: 650B carbon wheels // 47mm tires // 11-46T cassette
- Chainring: 44T

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CUSTOM
Starting at $3299

Choose the wheelset, gearing, and fit to suit your personality and favorite terrain.

Shop now

Want to use your own 1x or 2x drivetrain? Check out our Bring Your Own Drivetrain option.

 



 

 

Factory-direct

Details matter

Personal one-on-one consults

Ride it & love it:
30-day returns

No bull crash replacement

Invest in community

 

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

- 2 bottle mounts in the front triangle
- 1 bottle mount below the downtube
- 1 bento mount on the top tube
- 2 bottle mounts on the fork blades
- Front and rear fender mounts (seat stay bridge included)
- Wide central clamping area on handlebar

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

Max weight of rider + gear: 115kg (254lb)

When your bike shows up on your doorstep, you'll want to install and secure the bars, seatpost, pedals, and wheels, plus checking the tire pressure and making sure the bike is adjusted to fit you perfectly. Check out our setup guide to learn more.

If this isn’t something you’re already super comfortable with, your best option is to take your Thesis to a local professional bicycle mechanic. It’s always good to have a local mechanic on your side; you never know when you’ll need their help.

It's pretty darn easy and takes less than 90 seconds. See our video guide below:

Ordering and Customization

Nope, unfortunately not. We believe the OB1 is amazing in its own right, and that's why we stand behind the full bike.
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.
Nope, that was a limited time offer. But guess what? Our black frame is already primed for custom paint, so you can go wild and be you.
Guess what? Our standard “Black Carbon Matte” finish doubles as a primer for custom paint. We'd love to see what you come up with, so please send us photos. :)
Yes! We offer a version of the Thesis OB1 without the drivetrain so you can use your own. The OB1 is compatible with both 1x and 2x systems. Check out our Bring Your Own Drivetrain page.
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).

Please note that we offer a version of the Thesis OB1 without the drivetrain as well. The OB1 is compatible with both 1x and 2x systems. Check out our Bring Your Own Drivetrain page.

Thesis OB1 Maintenance

Short answer: it’s far lower than most people think.

We created the guide below as a starting point for determining ideal tire pressures for your particular body, terrain, and riding style. Off-road, the goal is to run low enough for optimal traction and shock-absorption, but high enough to prevent rim impacts over rough terrain. On road, the goal is to minimize rolling resistance and vibration-induced fatigue.

In both cases, because more of your mass will be distributed over the rear axle, consider running your front tire 5-8% lower for improved traction and comfort.

You’ll may notice that our recommended road pressures are substantially lower than what you may be used to with traditional 23/25/28mm tubed tires. Testing has shown that such wider rim/tire combinations offer superior rolling resistance relative to narrower combos. While running pressures that are slightly lower than our recommendations can improve traction and comfort with little-to-no impact on rolling efficiency, running higher than recommended pressures will reduce efficiency along with traction and comfort.

 

Yes, but you’ll need a model that doesn’t interfere with the dropper’s operation. Specifically, you’ll want something small and secure that attaches to the saddle rails and not the seatpost itself, and you’ll want to make sure it doesn’t get in the way when the post is fully dropped. Other options for on-bike storage include mounting a bottle cage to the bottom of the downtube for use with a bottle-shaped storage container, mounting a bento to the top of the top tube, or mounting a handlebar bag the bar’s wide central clamping area.

Not that for larger/heavier bikepacking-style seat bags, we recommend using your standard (non-dropper) seatpost.

It is completely normal in the beginning for tubeless tires to slowly leak air while the sealant works its magic. The same thin but robust sidewalls that provide such a smooth and efficient ride also have micro-pores that need to be filled, so it is entirely normal for a bit of sealant to weep through during the sealing process.

The best course of action is to ride. The sealant will foam up as it sloshes around, and riding continuously bathes the sidewalls in sealant in a way that a quick shake and spin during assembly cannot. Just be sure to bring a pump, tube, and 6mm hex wrench (for the thru-axles) just in case, as is good practice for all of your rides.

Dial in your fit with reach adjust. Get more power and control from your SRAM brakes by adjusting them to fit your hands. The adjustment is located between the shift lever blade and the brake lever blade on the underside of the brake lever. Pull back the shift lever to access the 2.5mm hex adjustment screw. When viewed from the bottom, turn the wrench clockwise to move the lever away from the bar and turn the wrench counter-clockwise to move the lever closer to the bar. Once you have your adjustment made, check to make sure that when the brake lever is pulled firmly, it doesn’t bottom out on the handlebar, limiting your braking power.

Levers feel spongy? You may need a re-bleed. While SRAM hydraulic brakes come pre-bled from the factory, the process of cutting and resizing the hoses to route them internally through your bicycle’s frame and fork can introduce enough air to the system to affect brake performance. This is why we recommend re-bleeding each system after installation in our assembly guide. Still having issues after a re-bleed? You may still have air in the system. If the situation doesn’t improve after a few squeezes of the lever, ask your mechanic if another bleed is needed. If bleeding the system yourself, be sure to follow SRAM’s recommended bleed procedure and pay particular attention to how dissolved gasses are removed from the brake fluid (time 0:59).

For more information, check out SRAM’s Road Hydraulic Brake Tips and Tricks.

Clamping a dropper is not recommended and can damage the post. Same is true of hanging a dropper-equipped bike by its seat.

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.

Shipping, Returns, and Warranty

Thesis is available to ship to the following countries:

  • Australia
  • Austria
  • Belgium
  • Canada
  • Denmark
  • Finland
  • France
  • Germany
  • Ireland
  • Italy
  • Japan
  • Netherlands
  • Norway
  • Portugal
  • Singapore
  • Spain
  • Sweden
  • Switzerland
  • Taiwan
  • United Kingdom
  • United States

Please note: all purchases are in US currency, and all customers outside the US are responsible for paying their own duties, tariffs, and customs prior to delivery.

We are exploring expansion into other countries. Send a note to support@thesis.bike if you'd like to request for your country to be added to the list.

A bicycle typically takes between 4-8 weeks. Here's how it works, and why it's worth the wait.
Shipping is a flat rate $99 for bicycles and wheels, and $4.99 to $19.99 for other components. At the time of this writing, taxes are only charged for delivery addresses in the state of California.
We're proud of our Ride It and Love It return policy, which lets you ride your bike for 30 days before making a return. 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.
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 | 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, Co-Founders of Thesis


Ride It and Love It: 30 Day Return Policy

We want you to love your bike. That's why we offer one of the best return policies of any bike brand out there. Ride your bike, love your bike, or return it within 30 days of delivery for a full refund minus the cost of shipping.

You may return like-new 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:

  • Products must be in like-new condition. Products that were damaged after arriving at your doorstep are not eligible for refunds, though we invite you to contact us about crash replacement options.
  • We ask you to cover the cost of shipping and packaging. Tip: hang on to the box your bike came in; it doubles as a good travel box anywhere you go.
  • 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 modified products or products ordered with custom paint.

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

 


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 90% assembled. By purchasing a Thesis bicycle, you understand it is 90% assembled and that improper assembly can result in product damage or failure that may lead to injury or death. You agree to follow instructions to assemble the last 10% before riding, or else to take your bike to a qualified professional mechanic for assistance. 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.