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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)

請問我的後花鼓會往前滑一點,
導致鏈條鬆一點點,

可能是後花鼓鎖不夠緊, 請問要鎖幾牛米ㄋㄟ ?