UK what I am saying is at peak HP you have to be at 200 with the gearing. that is all you do. just because you rev to 12.5 rpm doesn't mean you are making power there.you may lose 20 hp
there are several ways but the most important part on the gear calculator is measuring the circumference and the do not forget about wheel spin. on the street where you have miles to get there spin is not a problem but in a standing start fixed distance it is at 6 psi of boost I say over 7 mph...
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