Gearing a Orion Revolution 11x2 motor

[Kev Cooke]

What pinion should i use in my B4 when running a Orion Revolution 11x2 motor with a 78t spur gear? The B4 manual recommends a 20t pinion for the 81t spur but doesn't list details for a 78t spur.

[super__dan]

Well if you've gone down on the spur going down 1 tooth on the pinion will effect a similair though not identical ratio. How come your running the 78t spur?

[Kev Cooke]

I was only running the 78 cos that what was on the car and i couldn't be bothered putting the 81 back in