Well, you are the first I've heard of running an 81t spur. I think that you will find most guys are running with an 87t. If you run the larger spurs you will take the pinion/spur mesh further away from the belts eliminating this problem you have of the pinion touching the belt.
I run the stock tamiya pinions on the 501 and for the sizes that I dont have I use the RW long boss pinions, I have never had any troubles with these on either brushed or brushless motors.
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2 x TRF 415 MRE's 2 x TRF 501X's I'm TRF-Tastic me Come to the blue side and feel the love!!
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