Quality Remote Control Parts and Accessories

Pro Trani, 32 Pitch

New Pro Trani. 32 Pitch 56T Spur.

How to figure out what pinion you need?
Divide your current spur by your current pinion. then dived 56 by the number will equal your new pinion.
Example: 90 divided by 21 = 4.28
56 divided by 4.28 = 13.08
So a 56 and a 13 would be rally close to what you've been running.