Thesis Narrow-Wide Direct Mount Single Chainring

Thesis Narrow-Wide Direct Mount Single Chainring

Regular price $49.00
Lead time: 4-10 weeks    Learn more


DETAILS


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.

- Narrow-wide 
- Direct mount for stiffness, weight, & easy swapping
- Long-wearing 7075 aluminum
- Standard SRAM-type 3-bolt interface | 6mm offset
- 99g +/-5% (42T)

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.

- 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

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.

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.

Customizing Your OBI

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. :)
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.

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.
You can see latest shipping time status here. Your bike is “made to order” because minimizing inventory sitting in warehouses is part of what brings the OB1 from over $6000 retail down to $3299. We expect to reduce lead times as we grow.
Shipping is a flat rate $99 for bicycles and wheels, and $9.99 for small components. 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).
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.
At the moment, the OB1 is available in the United States. 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. 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 | 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.