So technically its an Oryg not a Gyro. Anyway, the important part is that its made for a BMX bike and rim brakes. But with lots of cutting, welding, and half-assing, I got it to work on my Kona mountain bike, with mechanical disc brakes. How fucking sweet is this! It really works too. I can't wait to bring it to Rye Wednesday to really work it out. Oh I also put a new BB on there since my old brand new one from like 2 months ago disintegrated on me!