It depends which one of those motors you end up buying. You'll need to know that before anyone can recommend a pinion. It also matters what shaft diameter the Losi motor has.
Mongoose motors have a 3.2mm shaft and RW Racing make anything from 9t and up. On a 10.5 Mongoose (7300kv) we commonly run 10/49 or 11/49. The stock Blaze spur is only a 45.
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