Originally Posted by
Tbuggy
you just have to do the math.
71/23=3.08
70/26=2.69 So if you wanted to use a 70 and get the close to the listed 71 you would actually want keep your pinion the same 70/23=3.04
What ratio are you going for?
81t equivalents would be;
81/27=3
81/30=2.7
Don't forget it also depends on the motor that you are running. These would be good for most 13.5's however the Tekin Spec R you will need a smaller pinion. I went from a 81/29 on my SMC 13.5 to a 81/24 with my Spec R motor.. I am going to believe that the new Reedy plus motors are probably going to follow the tuning of the Spec R motors.