[問題] 改裝Giant R3300
有沒有人也是一樣騎R3300然後有改裝的(大盤+飛輪），看了一下Sora大盤1800，Tiagra大盤2500。差了一個檔次使用上會有感嗎謝謝
原配是53／39，11／25最輕齒比1.5多爬坡真的很硬想改成50／34，11／28完美齒比，科科
手機排板請見諒
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