Gearing really depends on the track and the ESC settings.
If you run without loads of boost and turbo then we normally run a bigger pinion.
a 6.5 using a 21 pinion will give a different feel to 7.5. If i was using 6.5 i would likley go smaller on pinion.
The only way to be sure is to make sure you always have in your box range of pinions and try them for the track and motor you are running.
I normally start on 23 pinion for most models and go from there.
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