I don't know. Do what you have to do to get running. As for the tires, I've never been crazy about running the 40 series tires in a race environment. They are much heavier than standard size maxx tires and what I really don't like about the heavier tires is the adverse way that they affect runtime, the stress on the brushless system and increase the unsprung weight of the vehicle. I think that you'd be better of with a good set of MTR bowties or holeshots.