pinion

i asked this question a month or so ago but am about to finalize my order so i thought id get any last opinions...im using a 9xl on 4s and am thinking of using a 20t pinion and a 49t spur, is the 20t pinion good for bashing?

Edit: now im thinking maybe an 18 tooth pinion would be better for bashing, what does anyone think?

a month later and no responses?

[bdebde]

Try BrianG's calculator

Shoot for about 40mph to start out, gear up if you need more speed.