Depends on the track size.
Here in Holland we use the 93 a lot with the motor(Carson Cupmachine) we are using in the Dutch Tamiya challenge.
We drive mostly with foam tires with a rollout of 50/51
So if your running foams, go for pinions from 21 to 29(with the 0.4 module spur).
regards Roy
Originally Posted by
Bigtomo71
If im running a 104 spur what pinion would be best? 20-21 or bigger?