Originally Posted by
bigemike
I would rollout somewhere between 80mm and 100mm 0r 3.5" to 4.25" depending on how big your track is. Download the rollout chart and set your gearing from there. That should get you close.
80mm to 100mm? Isn't that very big. Sorry because I am very inexperienced in 1/12. On stock I used rollout of 40mm last race. Am I undergearing badly? The track was around the size of a basketball court with track width of 4 feet.