Originally Posted by
Skiddins
As we use rollout for 1/12 cars, due to the fact that the tyre diameter changes as they are used, you really need to use that for calculating gearing.
Pinion x tyre diameter (mm) x 3.14, then divide that result by the spur.
76t spur, 40t pinion and 42mm rear tyres would give 69mmpr etc.
We need to know what motor etc, which would get you in the ball park, then up or down a pinion could be used to fine tune.
If you're too far out to begin with you might overheat your motor.
Thanks for the information. My rollout right now is 4.2 using a 17.5 motor and one cell battery. That leads me to another question, do most state the rollout in metric or standard? I've had people talk to me about it in both.
43mm tires, 60T pinion, 76T spur. Trackstar 17.5 two timing marks towards +, with a trackstar genII one cell esc, not in blinky mode. She's a good runner and I plan on trying to fit a 61T pinion this week.
I was just wondering what was considered a big jump in rollout. Would shaving 2mm off the tires be a big jump? Or fine tuning? Would 1 tooth pinion change be a big jump or fine tuning? I'm just curious.
And should I cut the extra length of my axle off that sticks out 11mm past the left wheel hub?