Originally Posted by Maxxratter
Hello,
I just picked up the new GTB 4 cell and 13.5 sintered rotor motrr combo for my 3.2R
I think I have a 100 spur in it...(100 ok?)
Which pinion I should use?
Is there are handy chart out there somewhere?
Thanks...
for this motor you have to gear TALL. ignore any spurs sizes used for running 27T brushed motors. most are going with a 88 or smaller spur to get into the 13.5 gearing ballpark faster. not to long ago, PRS just came out with 76, 80, 84 tooth 64P gears based on requests of 12th oval and onroad racers.(precisionracingsystems.com)