RE: My 1/4 scale WCM Nascar to Drag Car
Hey, I'm on here...
The way I see it, with all that squishy drag foam on the tires, if there's any "play" in the rear drivetrain, THAT's where it will show up.. or get soaked up... a small amount of rear axle movement probably doesn't do anything disturbing in transferring power to the ground. The only possible detriment would be if the movement was severe enough to disturb your gear mesh, which it certainly isn't... and those molded nylon spur gears usually have a thou or two of squish to them, too... along with the bearing in the motor can.
Besides, if there was excessive play in the bearing, as soon as you hit the throttle, the spur gear would try it's best to divorce itself from the pinion, and slam the rear axle backwards in the bearing, probably holding it there until you got off the throttle.
I've not seen that ceramic bearings are a noticeable improvement in anything, except where heat is a factor, like in a nitro motor's crankcase.