Twostroke Series

Built for the front row, the Twostroke 01 carries BMC’s XC racing heritage forward into the future. A refined geometry and key technical upgrades built on an already solid hardtail platform.

Swiss-born in our Impec Lab it’s ready to dominate your home turf, or even a wild adventure in a distant land.

Fit For Every Challenge.

We know everyone rides differently; we get it. Race XC courses? Adventure out your backdoor? Rip across continents? Set a new track record? Or for a multi-day trip? Whatever. We take every watt. You take every win.

Geometry Updated.

Higher efficiency. Better handling. Greater versatility. We changed its front end, how you fit on the bike, and how it will accept different specifications of the components you choose.

01 Premium

Our best carbon grade. Attention to detail and high quality craftmanship give the Twostroke the foundation to support your ambition.

Multi-Faceted

You decide what you ride, how you ride. We planned everything, from traditional to nonsense rides and configurations. Twostroke 01 will be what you want it to be.

World Cup Configuration. And More

Our new hardtail features a progressive geometry and fast design, meeting the latest standards. Now fully aligned with the Fourstroke philosophy.

Not every innovation requires a revolution.

More often, it’s about the right evolution.
Small, deliberate improvements that make a meaningful difference.

Innovation & Technology

Drivetrains Compatibility

The Twostroke 01 is compatible with AXS, Di2, and mechanical drivetrains, allowing you to choose between the straightforward reliability of cable-actuated shifting or the crisp precision of electronic systems.

Cranksets and Chainrings

Designed around a 55 mm chainline and compatible with chainrings from 26T to 38T, the Twostroke 01 lets you tailor your gearing to any terrain or challenge.

Hydration Mounting

With three threaded inserts on the downtube, you can choose the ideal bottle-cage position, and you can confidently fit two bottles inside the front triangle.

Custom Chain Guide

is mounted securely to the frame and can accommodate chainrings between 32T and 36T, thanks to a fully adjustable design that ensures optimal chain control at all times.

Pure XC racing from short course to marathons, are covered. Podiums in sight.

Adventure? Strap your bags and roll! The Twostroke has always been the BMC for the multiday rides on rough terrain. It could even be our most capable gravel bike if you want it to be. From Frankenbike to race weapon, with eyes on the future, we designed it for the next generation of trail stars.

Q&A

The Twostroke is built for riders seeking a fast, lightweight XC hardtail with progressive geometry. It’s designed for XC racers, ambitious trail riders, and anyone who wants a responsive, efficient bike for training or everyday performance. Thanks to its versatile frame design and wide range of compatible
configurations, the Twostroke 01 also appeals to adventure riders and gravel enthusiasts looking for a capable, adaptable platform for long journeys and varied terrain.

Surprisingly, yes. Thanks to its dropped and widened flat seatstays and a compliant D-shaped seatpost, the carbon frame provides noticeable vertical give. It’s comfort by design, something rarely found in classic, rigid XC hardtails.

The seat tube is engineered around our compliant D-shaped seatpost, yet it still supports standard Ø27.2 mm posts via a dedicated shim. Dropper posts use the same shim and integrate seamlessly thanks to fully internal actuation-cable routing.

This depends on your fork specification and it’s compatibility with a new airshaft. Some forks are not allowing some travel options.
• the SID SL Select+ allows for 100 and 110mm travel options.
• the Judy Silver allows for 100, 110 and 120mm travel options.

Yes, it’s technically possible, but there are important limitations to keep in mind. First, the Twostroke’s reach is 60 to 75 mm longer than what you’d find on a typical gravel bike. This means achieving a proper drop-bar riding position can be challenging. You may need to consider sizing down to compensate for the longer frame, but doing so requires close attention to your saddle height and ensuring you still meet the minimum seatpost insertion requirements. So while the answer is yes, it’s a fairly tricky setup. We strongly remind riders that the Twostroke 01 is fundamentally an XC mountain bike, and converting it into a gravel configuration will always come with compromises.