Originally Posted by
jhock
What kind of gearing/rollout you guys using on your 12th scales? I have been messing with this for awhile now and i feel i dont have the speed. I am using the RS with redline 10.5 in a 12R5. Let me know. I have a 81 tooth spur.
You need to be around a 65mm rollout +/- with a 10.5 depending on the size of track and layout.
Knowing the spur size does not help us help you calculate the proper pinion to reach the rollout w/o knowing the tire diameter too.