[問題] 後輪發出像火車一樣的聲音
最近發現在踩踏時聲音有點大，
很像火車的轟隆轟隆聲
https://dl.dropboxusercontent.com/u/8027988/biketrain.mp4
飛輪變速中間到最高時發出的聲音比較明顯
請問大家知道是哪裡出了問題嗎？？
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