Originally Posted by Ooj
No it should be this
Tyre diameter * 3.14 / (spur/pinion)
For touring sedans it is
Tyre diameter * 3.14 / (spur/pinion*internal ratio of car)
tire diameter * 3.14 * (pinion / spur) = rollout
In calculating it out, they both work. Just different routes of getting there.
Thanks again for all the help.