I need help with the formula on roll out and the the best place to start with gear ratio/ tire size, when running 19 turn on short tracks.

thanks grant

pinion x tire diameter x 3.1416 / spur = rollout

now the rollout will depend on the track size and how much timing you got in the motor. at the track we run at guys are running anywhere from a 2.60 rollout at 24 degrees to 2.15 at a tick over 36 degrees.

i do it like shadow said for when i want to know the rollout i am running. but when i find out from other racers what rollout i should be running and i need to know what pinion i need to use here is the formula ive learned to use

rollout x spur/ tire diameter/3.1416=pinion

write down both formulas close by your calculator so you can access it anytime easy :)

hope that helps

joe ivo

Thanks For All The Help. Grant

Hay Grant, are you going to come out and play on the 9th at racers

leo

lLeo whats up,i plan on it,i have not drove a pan car in years,i plan on running 19 turn,so you better stay out of way.Is gary h going to run.
GRANT