Gull Bikes Chip Bandit 149 3

Not a real brand...

I designed and made this bike as a personal project and to [hopefully] last me a long time. Basically everything is designed with longevity in mind, so big bearings, doubling up at key points, not trunnion, minimal threads in the frame (better alignment, can replace a bolt rather than a whole frame member), press in cups etc. Basically aiming for a pretty "normal" bike that doesn't have too many riding quirks or excessive complexity. This project came with a bunch of interesting and fun problems to solve, like designing so that the lugs were affordable, speccing the tube layups, figuring out how to ensure accurate dimensions and alignment without a surface plate, mill, or lathe. Knowing which dimensions will affect the kinematic (and how) meant that I could focus on getting those accurate, and use others as "follower dimensions" to absorb a tolerance stack without random undesired effects, and designing the jig to work with and within these limitations. 

Still have a few small things to do (furniture feet on the chainstay is not the final solution, and I have some pour molds planned), and the parts spec is a total mixed bag of odds and ends from a cheap second hand donor bike - but it's all functional, solid, and can be replaced as it becomes affordable...

Key Geo

HT 64° & 130mm

Reach 500mm

Stack 635mm

BB Height 347mm

CS 446mm

Seat Tube Effective 77°

Frame travel 149mm @ 19% Progressivity, mostly in the first half of travel

Need to clean up some of this messy gluing... Maybe one day