Feature

●Installation requires professional knowledge Failure to do this may lead to unexpected accidents. Installation is done by a bicycle seller. Compatible with SHIMANO GRX 810-815 Di2 (2x11 speed) series or Ultegra RD-RX 800-805 (Di2) 3K carbon cage Full ceramic bearings 7075 aluminum pulley 14T-17T Weight: 2.6 oz (76 g) Maximum sprocket: 34T

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Description