235/60/18与255/45/20的轮胎的外圆是一样大吗？ 轮胎245/60r18和255/50r20的区别
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255/50r20\uff1a\u8f6e\u80ce\u76f4\u5f84\u4e3a255MM\u3002
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255/50r20\uff1a\u8f6e\u8f8b\u76f4\u5f84\u662f20\u82f1\u5bf8\u3002
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235/60/18 18英寸*25.4mm/英寸=457.2mm 235*60%*2=282mm 457.2mm+282mm=739.2mm
255/45/20 20英寸*25.4mm/英寸=508mm 255*45%*2=229.5mm 508mm+229.5mm=737.5mm
255/45/20的外圈直径还小于235/60/18的外圈直径1.7mm，基本相同，差别也只是有1.7mm/737.5mm*100%=0.23%，基本忽略不计
当255/45/20跑120km/h的时候的轮胎转速，换成235/60/18的轮胎的时候，能跑到120.276km/h，如果反过来，119.724km/h，基本上不需要校准车速表的。
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