鎖くさり歯は車ぐるま

noun

sprocket wheel

A toothed wheel that engages with a chain, used in bicycles, motorcycles, and machinery.

• 自じ転てん車しゃの鎖くさり歯は車ぐるまが摩ま耗もうしたので交こう換かんした。

  The bicycle's sprocket wheel wore out, so I replaced it.