a type of bicycle gear that works by moving the bicycle chain from one sprocket wheel(= a wheel with a row of tooth-like parts) to another(自行車的)換擋裝置,變速器
Set the rear derailleur in the lowest gear, with the chain on the biggest sprocket wheel at the back.把後輪的變速器調到最低擋,就是讓鏈條在後面連到最大的鏈齒上。
derailleur gears換擋齒輪
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