Diy Carbon Fiber Bike Frame . There is a ton of. You can also build e.g. New DIY Road Bike Mountain Bicycle Light Speed Aero Carbon Fiber Frame from www.aliexpress.com The first step in building a frame is to design the frame you intend to build. After mentioning motorcycle kits and components i noticed these two links describing the process for building carbon fiber bicycle frames.super light and super strong,. I borrowed a frame jig, but was able to build a hardtail carbon frame for around $400 total.