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[What's_nitro?]

The problem is that I need to gear "high" to get any reasonable speed out of a high-wind motor because I have 3" tires on the truck. We're talking close to a 2:1 pinion/spur ratio. Yes, I do have M1 Revo spur gears with the Revo slipper. I have M1 14, 16, 18T pinions, and 40, 38, 36T spurs.

Why so high you say? I want around 35K max unloaded rpm on the motor with 8s lipo to make it efficient. With standard Rustler gear ratios, say 19/87, that's less than 40 mph with 3" tires. I want the small tires to keep ground clearance to a minimum. I don't mind donuts, but I don't like rolls.