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作者: bmxurso 時間: 2009-10-10 00:38
標題: crc
crc 12son 11.5t 用92t 42t 可以嗎?ching!求教~求教~

作者: hardmankam 時間: 2009-10-10 01:49
本帖最後由 hardmankam 於 2009-10-10 01:51 編輯

assuming your tires are 45mm
then 92/42 is overgear (rollout out of 65mm)
you should aim for rollout of about 55mm for 4cell NiMh, so use pinion 36t.

Here is the rollout formula:
rollout = Pi * TireDiameter * pinion / spur
or
pinion = rollout * spur / (pi * TireDiameter)
or
pinion = 55 * 92 / (3.1416 * 45) = 35.79 or 36 tooth

hope this helps.

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