DOH!!! mission, guess I should have read better...
from what they have on the schuie web site your internal is 1.8:1 or 2.1:1 depending on how you have it set....
the equation is this:
(spur gear/pinion gear) * internal ratio = final drive
for mod motors.. anywhere between 9:1 to 12:1 final ratio would be a decent place to start.
working backwards with 2.1 internal ratio and a 84T spur:
9 = 2.1 * (84/x) solve for X to get your pinion gear, round up or down as needed
in this case X = 19.6 rounding up use a 20T pinion...
this will help you get in the ball park for gearing, from there you refine by going up or down teeth on the pinion.
hope this helps a bit...
Last edited by RAP66; 06-19-2003 at 01:42 PM.