[31trum]

hi ive got a old pace with about 20 millimetre horizontal dropout, am currently running a 50t ring and a 17t bmx sprocket on the back , need to know different set up/ring sizes but need to keep within the 20mm.
any advice greatly appreciated

many thanks

 

[pacman]

You're in luck

hi ive got a old pace with about 20 millimetre horizontal dropout, am currently running a 50t ring and a 17t bmx sprocket on the back , need to know different set up/ring sizes but need to keep within the 20mm.
any advice greatly appreciated

many thanks

You only need 12.5 mm play to run any chainring - cog combination.