Hello mate
It really depends on the track...
Is it low traction or high traction? Are there any really big straights or is it small and technical???
I would start of with a 23 as I have found to be a good starting point for a 7.5 motor...of course that applies to previous generation motors
Hope this helps...
Regards
Argi
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Team Kyosho-Proline Racing-Team Orion-LRP-Maugrafix-ZWorks.tk-Rudebits-Ghea Racing
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