Many times people wonder about all the different part numbers for sprockets for the TD and TZ models over the years.

Most people do know how to calculate the gearing and/or roadspeed, but here is a handy table to start with before choosing the correct sprockets.

P.S. N/Gr is the max rpm of the wheel with these sprockets, Tyre=S is the circumference of the tyre and M/min is metres per minute, etc. You can copy this easily in an Excel file and see how fast you go! (or try to go...)