Personally speaking, I never run bigger than 12.5. This used to be my std all the time on 21pinion. However, at a regional this year I changed to a 12mm rotor and 20 pinion as i was looking for it to be a bit softer on the bottom end. It is softer on the bottom end (just) and silly fast at the mid to end of straight, so haven't touched it since!
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Matthew White
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