質問者が納得20.5*0.5*2+2.54*17=63.68(直径)
63.68-2.54*19/2=7.71(タイヤ厚み)
7.72/20.5*100=37.6(偏平率)
20.5*.035*2+2.54*19=62.61(直径)
100-62.61/63.68*100=1.68% →メーター誤差プラス
21.5*0.3*2+2.54*19=61.16(直径)誤差+4%・・215/30-19
22.5*0.3*2+2.54*19=61.76(直径)誤差+3%・・225/30-19
23.5*0.3*2+2.54*...
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