Miles's Bamboo MTB with Eccentric BB

Miles holds up his mountain bike frame like a trophy — which, after a weekend of wrapping and waiting and sanding, it essentially is.

This MTB build includes an eccentric bottom bracket, a detail that suggests belt drive intentions. Eccentric BBs let you tension a belt or chain without the traditional dropout adjustment, keeping the rear wheel position consistent for disc brake alignment.

The frame construction shows natural bamboo tubes joined by dark flax fibre lugs. The wet-look gloss on the joints suggests this photo was taken right after the final clear coat — that satisfying moment when all the work comes together into something you can hold.

What stands out is the rocker dropout at the rear — a machined aluminium piece that offers multiple wheel positions. Combined with the eccentric BB, this gives Miles flexibility for different drivetrain setups on the same frame.

The workshop backdrop tells its own story: paint-splattered shirt, white breeze-block walls, the industrial setting where bikes get made rather than marketed. This is the authentic side of cycling — dirty hands and earned results.

Building a mountain bike frame takes particular confidence. The forces involved are higher than road riding, the geometry more aggressive, the margin for error smaller. Miles clearly trusted the process and his own skills.

Frame completed, trails waiting. That's the look of someone ready to ride what they built. 🔥

Want to build your own? See our mountain bike frame kit.