全港最大單車品牌代理｜一站式單車購物首選
IRDRX825A
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SHIMANO GRX Di2 12 速後變速器採用內建無線連接組件和充電端，不僅確保能在混合地形快速穩定地變速，還能輕鬆充電。 整合式 SHADOW RD+ 技術可避免鏈條甩動，即便在嚴峻地形上也能精準變速。 此外，內建的 ON/OFF 開關也將輪組拆卸變得輕而易舉。 RX825 後變速器與 11-34T 及 11-36T 12 速卡式飛輪相容，且支援全同步或半同步變速模式，讓騎乘者有更多空間能根據自己的需求進行調整。
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