drive belts

While I'm waiting for the ESC and servo tester (aka throttle) to arrive, I'm trying to figure out what gearing I'll need with my new motor.

My Piaggio Boxer wheels are 14" in radius, so if my high-school geometry is right, that's 2 x pi x r = 88" in circumference.

If go 5 mph, that's 316800 inches per hour, that's 3600 rotations per hour or 60 rotations per minute.