Originally Posted by
2hundy
Would a 26t pinion fit with a stock 70t spur? 25t to 26t is an increase in diameter of 0.8mm so the pinion-spur distance is 0.4mm closer with the 26t. In my experience tamiya motor mounts provide a relatively loose mesh, certainly looser than I would set on my BD7.
I'm entering a stock spec class where only the pinion can be changed.
You could try...and see if you can turn the wheel freely...the stock motor mount only up to 25t pinion for 70t spur.
0.4mm gear mesh seems a lot to me as I usually left a paper thin gap between spur and pinion which should far less than 0.4mm