Let me first state that I am not a bicycle mechanic and was inspired to do this based on a Felix wong's article about quieting a loud freehub. He posted his before and after results on youtube and the results were quite dramatic. Link to the article below.

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Why I wanted to do this modification was simply because I noticed that the rear wheel hub seemed to not spin as freely as my previous shimano ultegra 6500 hub which is incredibly quiet in use.

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