The standard high gear sprocket has 25 teeth. However, I suggest it’s best to alter the output sprocket to change the ratio. They are supplied with 19,20,21 or22 teeth and are
available from Ken Lack.
As an aside, a 42tooth sprocket is considered the best low gear sprocket to give the
easiest chain adjustment for both sides but the size can be altered to suit your local
riding terrain.
Laurie.
