Is that a B-Max2 ver.3 or a B-Max4 III? In case it is the 2WD car I'd say use a 25t together with the 80t spur gear that comes in the kit. IIRC Yokomo included a 25t pinion with the original B-Max2 and recommended it for a 7.5 turn motor. It worked pretty well on any kind of track in mine back in the day paired with a Thunder Power 8.5.
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