You are reading a single comment by @hippy and its replies.
Click here to read the full conversation.
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
hippy
gbj_tester
Yes, it's called maths. The pitch circle radius of a roller chain sprocket is very close to Pitch×Z/2π, then add 4mm to get the top of the teeth
(12.7×38/2π) +4=80.8mm, so your stays need to be 2×(chainline-4mm*) apart at a point 81mm from the BB centre
*half the ring thickness + clearance for flex