Quote:
Originally Posted by MiCk B.
You'll want the same overall as you were running with the 84t
So 84 - 20 is 10.50 overall
With an 81t spur a 19t pinion would give 10.66 over, as close as you can get between the two spurs.
Gear chart. (PDF document)
MiCk B. :-) |
As a quick mental calculation you can normally assume that 3 teeth on the spur equates to 1 tooth on the pinion. So to keep the same approx ratio if you drop 3 on the spur then drop 1 on the pinion etc.