Shimano RD-R7150 105 Di2 12-Speed Rear Derailleur

Shimano RD-R7150 105 Di2 12-Speed Rear Derailleur Bringing 12-speed electronic shifting to Shimano 105; the RD-R7150 Di2 Rear Derailleur benefits from trickle-down technology from the Ultegra and Dura-Ace groupsets. The system is semi-wireless; with no cables between the derailleur and the shifters; but both derailleurs are connected to a single battery by a loom within the frame. The rear derailleur governs the wireless signals to the shifters; houses the battery charging port and gives access to shifting mode choice. Connection to Shimano’s E-tube app gives access to more information; metrics and customisation options whilst it is also possible to connect the system wirelessly to compatible bike computers for gear shift and battery readouts. The derailleur uses four self-lubricating fluorine-coated link pivot bushings for long-lasting; low-friction smoothness and features cold-forged aluminium link plates for stiffness and more accurate shifting. There is a saver function to protect the derailleur in the event of an accident or crash and its maximum cassette compatibility is a very useful 36 tooth sprocket.