Originally Posted by sidecarphil1

This is dependent on a few things , I was in the same position as you a couple of weeks ago ,

You need to think about track size , motor and speedo combo , and then finally tyre size

in 1/12th racing the guys talk in rollout , not FDR , this is how far the car rolls for 1 turn of the pinion ,

I am too lazy for this and use Gearchart on my Iphone to work it out LOL

good luck and i hope you enjoy 1/12th racing as much as me