[問題] 輪胎周長問題
我的輪子是700x25c
照精華區所列的周長是 2145mm
但是我的碼表附的說明書是 2124mm
由 網路得知 700x25c 直徑是 622+25*2
周長應為 (622+25*2)*pi=2111 才合理
那到底...有人能解釋嗎？
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