You can aim for rollout of about 55 to 60 mm for 10.5 @ 1S.
Rollout = Pi * (Rear Tire Diameter) * Pinion / Spur
In your case, if your rear tire is 46mm, then the pinion you will need is from 36t (rollout 55mm)to 40t (rollout 60mm).
Remember as your rear tires wear, you will need to gear up to maintain the same rollout.
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It is also recommended to use 120A esc in 1s 1/12, since the current drawn from such a low voltage will increase heat quite significantly.
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