Depends on the motor kv,if you run too large a pinion for the given motor it will overheat, thats what kills them,ask other people who use the same motor, what they use,
I run a 10.5 mongoose motor(7300kv)on a 10 pinion with stock 45 spur with a fan and it runs warm,could go to a 11 pinion,but any bigger it would probably overheat
HTH
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