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原來可以拿來刮手繭，真是天才........XD

原出處 ----> link

I finally found the root of all my BB problems. The BB bolt is usually too slack and usually comes out more as you ride. So I normally just use more force to tighten it and that just messes up the BB over time.

So using this...  (full text)

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一個即興拍出來的教學，略顯簡陋，先給大家參考參考。
另外，這邊還有一篇相關的文章： link