Inferno ST-RR Gearing Question

[simplechamp]

I would start out with the 52/13 and go from there. Run it and watch temps closely, and you can decide how you like the torque and top speed, and also decide if the temps are reasonable. I can say with a 1.06:1 rollout ratio you will have plenty of torque.

As for the spur gears, I personally have never had an issue with steel and choose to use those, but some people do prefer plastic, it's a personal preference you can experiment with.

[nuz69]

Depending of your driving style, a higher top end (bigger pinion) will provide an higher torque impression, it's like the brushless motor can compensate indefinitly the higher load. But what we don't always realise is that this draws more amp from ESC and batteries.
I would go with longer motor than the 1515 for a truggy.