Originally Posted by Shangrila

Many thanks for your response Tony!

How often do you remove them? I may have been king konging it tightening but the thread inside the pinion and the sidewall / end of the pinion (facing motor side) did crack right behind the grub screw hole. Mini racer next to didn't even have to look at it to tell me what happened. So it's happened here often enough for people not to want to use it.

I'd like to buy another one but it's expensive if it's going to fail again.

So, can anyone help with the pitch?

Thanks very much for the tire size info. Very helpful to know.