Quote Originally Posted by Al Fowler View Post
I think mines 19/ something. Still dont know what it means.
AL
On your back wheel

Big sprockets and little sprockets mate yes.

Okay mark a tooth on the little sprocket with tipex or marker, turn the sprocket and count the teeth, should be either 12 or 13 usually.

Same on big sprocket and that could be 25, 26 even 29

Or if you clean your bike and the sprockets arnt covered in crap it should say the num,ber on them. Although some dont.
Campag ones usually do.

The 25/26/ 29 ones are your climbing sprockets

hence the bikie 12/25 or 13/26
Not much difference and everyone is different in there preference.