Shimano 105 RD-R7150E Di2 Rear Derailleur – 12-Speed For 2×12-Speed Direct Mount, Black. The Shimano 105 RD-R7150 Di2 12-speed rear derailleur completes a shift in the blink of an eye with its high-performance motor and optimized link structure. This is the hub of the Shimano Di2 system, with the charging port, indicator LEDs, adjustment switches, and more integrated into a compact package.

• Low-profile Shimano Shadow RD design reduces damage from contact and falls
• Receive the wireless shifting signal from the shift lever
• Check the battery level and Bluetooth/ANT pairing success with your cycle computer, smartphone, or tablet
• Allows selection of preferred shift mode and view adjustment mode information (if you wish to tweak or tune your rear derailleur)
• Smartphone/tablet connectivity via E-TUBE PROJECT

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