Carbon Lugs: How We Made Bamboo Bike Building Accessible
The story behind the pre-moulded lugs we developed for building a bamboo frame at home.
Context
A bamboo frame built the traditional way — wrapping and bonding every tube junction by hand — takes around 70 hours. That is rewarding, but it is also a real barrier for a lot of people who want to build their own bike but cannot give up two working weeks to do it. So we set out to keep everything good about a hand-built bamboo frame while making it far quicker and more repeatable to assemble.
What we did
We developed pre-moulded carbon lugs — the joints that hold the bamboo tubes together. Working with academics at Oxford Brookes University (with the University of West London), we 3D-printed the lugs in nylon-reinforced carbon fibre and bonded the frame with a high-strength urethane adhesive. Designing the lug around the frame let us build in the things a good frame needs from the start: stiffness for efficient power transfer, the correct tolerances for standard components, and tidy internal cable routing.
We proved the idea in the most public way we could. At the Design Museum in London, during the Cycle Revolution exhibition, we designed, 3D-printed, built and test-rode a 3D-printed bamboo bicycle — live, in front of visitors. BikeBiz called it the world's first.
What came of it
- The pre-moulded carbon lug became the basis of BBC's first easy-build kit.
- It made a bamboo frame far quicker to assemble, while keeping the bike genuinely buildable at home with basic tools.
- The 3D-printed bamboo bike was built live in about 8 hours at the Design Museum.
Why it matters
As a society we need more local production, more low-carbon materials, and more products that can be built and repaired by the people who own them. The carbon lug was how we first made a hand-built bamboo frame something far more people could take on — without losing the craft, the ride quality, or the bamboo's natural vibration damping. Today's lugged kits build on the same idea, with pre-formed aluminium lugs.
"By combining the lug with bamboo, it offers a natural vibration dampening and resolves the current bicycle market's lack of flexibility and high costs." — Designboom
Links
- Press: BikeBiz
- Press: Core77
- Today's home frame build kits
Build one today: see the Gravel Lugged Frame Build Kit, or browse all our bamboo bike frame kits.
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