crc 的齒比點算出黎!

For rollout, the calculation is:
3.14 x Tire Diameter x pinion / spur

eg: for 45mm form tires and using 30pinion 95spur, the rollout is:  3.14x45x30/95 = 44.6mm
meaning that for 1 revolution of the motor, the car will travel 44.6mm distance.