Thread: 21.5 2S rollout?
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Old 03-10-2012
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f888fhw f888fhw is offline
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So if my maths are correct you are running a 29 - 30 T 48dp pinion?

(51*3.142*X)/70=68mm rev

X= 68*70/51*3.142=29T pinion

51 = standard sort of rear tyre dia

70 = Standard mardave 48 DP diff spur
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