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齿比与里程表误差计算器
要换轮胎或轮毂？输入新旧尺寸，查看里程表误差与有效齿比变化。
Original tyre
/R
New tyre
/R
Speedo error
+1.2%
speedo reads slow (you go faster)
At an indicated 60
60.7
real speed (mph or km/h)
Bigger overall diameter also lowers effective gearing (relaxed revs); smaller raises it. Full tyre size calculator →