Print Page - 1961 M21 gear ratio

Title: 1961 M21 gear ratio
Post by: watts on 24 Mar, 2025, 12:29

Hello

I have a 1961 with a 16T engine sprocket.
Clutch 43T
Gearbox 19T as far as I can see.
Rear wheel 42T

I am going to ride it solo would it be sensible to change it to 20T or 21T or bigger?

Thank you
Matthew

Title: Re: 1961 M21 gear ratio
Post by: idie on 24 Mar, 2025, 13:28

A 19 engine sprocket would be what I would go for.

BSA Owners' Club Workshop Discussions

The BSA Workshop => Singles => Topic started by: watts on 24 Mar, 2025, 12:29