The OB1 Frameset

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While our original spec results in our idea of the perfect bike, we can’t wait to see what yours looks like. Whether you’re looking to run vintage XTR with bar end shifters for tou ring, you’re a Campy person, or you want to migrate parts over from a past bike, our frameset lets you build your unique version of the OB1. Frameset includes: Frame and fork (including bolts and spare frame hardware) Thru-Axles Headset Spare derailleur hanger (we'd hate to leave you hanging) Compatible with mechanical 1x, electronic 1x and 2x drivetrains only. Not compatible with mechanical front derailleurs Want help building your perfect bike? Schedule a consult with one of our resident bike nerds to discuss your fit and chat about your build. Overview Specs Geometry FAQ With nimble yet stable endurance geometry, the OB1 is truly a do it all machine. Chase down roadies, explore some new singletrack, or load up for a long adventure. Join the N=1 revolution. Current lead time: Frames ship in 2-4 weeks depending on size and color. Frame modules require full assembly. We strongly suggest using a professional mechanic to build your bike to ensure you get a safe and reliable machine. Why you'll love the OB1 Endurance road geometry for all day comfort and balanced handling. Dropper post compatible 27.2mm seat tube. Clearance for high volume tires up to 650B x 47mm and 700C x 40mm for exceptional traction and a smooth ride. Specs Chassis Click on the name of each component to learn more about why we chose it. Every detail is chosen for the optimal balance of performance, durability, and serviceability. To learn more about our approach, check out how we built a high-end carbon dream bike. CHASSIS FRAME Thesis OB1 Carbon DETAILS Spirited yet stable endurance road geometry Clearance for 650B x 47mm or 700C x 40mm Mounting points for (5) cages, fenders, a bento, and more Up to 46T or 50/34T chainrings Round 27.2 seat tube with traditional seat post clamp Construction: Reinforced Toray 800/700 1145g +/-5% (medium black w/o hardware) 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, extra bottles, and everything else you may need along the ride. 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. FORK Thesis OB1 Carbon with SteerSafe DETAILS Accommodations for fenders, headlight, and cages Clearance for 650B x 47mm and 700C x 40mm tires Steersafe-reinforced carbon steerer 12x100mm thru-axle dropouts Reinforced Toray 800/700 carbon construction 445g fork | 45g SteerSafe 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. Note that we pre-cut our steerers to an exposed length of ~69mm, then bond in our SteerSafe insert from there. We do this to prevent folks from using a tall stack of spacers below a downward-pointed stem, as this can lead to imprecise steering. Those needing a more upright position should start be flipping the stem. Should this prove insufficient despite the OB1s relatively tall head tube, we recommend sourcing a 17 degree stem in order to maintain steering precision. THRU-AXLES Thesis Hollow-Light Bolt-On DETAILS Hollow bolt-on 6mm hex head Strong and durable 7075 alloy Just ~80g per set WHY WE CHOSE IT Our hollow bolt-on thru-axles are machined from ultra-premium 7075 aluminum for strength, durability, and ease of wheel removal at less than half the weight of levered designs. SEATPOST CLAMP Thesis Flush DETAILS Integrated look Traditional clamping interface for even distribution of forces WHY WE CHOSE IT OB1's seat clamp achieves its integrated look while utilizing a traditional clamping interface that, unlike proprietary integrated designs, evenly distributes clamping forces to avoid seatpost creaking, slipping, or cracking. HEADSET Thesis Integrated Stainless DETAILS Stainless steel cartridge bearings Sealed upper cap Split crown race Upper: 41.8x30.5x8 | 45°x45° Lower: 51.9x40x8 | 45°x45° WHY WE CHOSE IT Designed for durability, our lightweight integrated headset features premium stainless steel bearings to prevent corrosion in wet and muddy conditions. 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. DERAILLEUR HANGER Thesis Replaceable DETAILS Rigid 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. The 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 Click for details 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: 125kg (275lbs) Have a question? Check out our FAQ or reach out to us directly at [email protected] to talk to a real human. We're always happy to talk bikes. Shop now Geometry Frame Size XS S M L XL Typical Height Range 5'1" - 5'5" 5'4" - 5'8" 5'6" - 5'11" 5'10" - 6'2" 6'1" - 6'5" 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°) 70 80 90 100 110 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 - 750 735 - 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 about the OB1 "I've been playing bikes for over twenty years now. This bike inspires a mix of speed, fun and confidence I've never felt before. I had high expectations for this bike, and I’m happy to say it has blown me away." - Rachel C. “I've been loving my OB1. It's opened up a whole other world of riding for me with many new places to explore. Every time I'm on a new trail, I'm blown away by the beauty of the new places I'm discovering, excited to go out and try a route I've never done before and very thankful I have the OB1 to take me to all these places I previously couldn't go to before.” - Andy W. Show more