請問CN-7900 跟 CN-7901 差異在哪?SHIMANO的鍊條不是都以5601、6701、7801、7701、7901 來定編號嗎??怎會跑出7900呢?? 差在哪裡??SHIMANO原廠有出快扣嗎?7901公司貨怎是附PIN呢??求大大解答
CN-7900 came with a reusable link which encounter noise/clicking problem with it.At the same time, Shimano discovered that the pro mechanics never remove a chain for cleaning .So, CN-7901 went back to the non-reusable special joining pin.