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The RX825 rear derailleur combines SHADOW RD+ chain stabilization with an on/off switch: turn it off for easier rear-wheel removal, or on for a quieter ride and precise shifting. It also serves as the wireless hub for Shimano’s 12-speed Di2 system, connecting to shift levers, compatible cycle computers, and the E-TUBE PROJECT Cyclist app. The built-in charge port and multi-function button support battery checks, Bluetooth pairing, and derailleur adjustments.
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