Hard to say without knowing your spur gear size and final drive ratio. Usually its best to experiment a bit, start with the pinion you have and gear up until you start to notice the motor and ESC getting hot. You can usually find someone with a temperature gun you can borrow in the pits on race days (Me for example). Keep motor and ESC temps below 150 degrees and you shouldnt have any problems. When you hit about 170 you start to get ESCs blowing up and motor bearings failing.
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TLR 22
B44.2
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