The Shimano 105 Di2 RD-R7150 brings electronic shifting to the 105 groupset for the first time, delivering precise and consistent 12-speed performance with a semi-wireless architecture. Designed for road cyclists who want reliable, fast shifts without the complexity of full wired systems, it pairs seamlessly with 105 Di2 STI levers and is forward-compatible with higher-tier Shimano Di2 groupsets.

Highlights

• Semi-wireless architecture: Shift levers communicate wirelessly to the derailleur via Bluetooth and ANT+, eliminating cables between the levers and rear derailleur for a clean cockpit setup.
• Electronic precision: A high-performance motor and optimised link structure deliver fast, accurate shifts every time, regardless of rider fatigue or cable stretch.
• Shimano SHADOW design: Low-profile cage geometry reduces the risk of impact damage and keeps the derailleur tucked close to the drivetrain.
• Wide-range compatibility: Supports cassettes up to 36T maximum sprocket with a 41T total capacity, accommodating both compact and standard chainring combinations.
• Integrated battery and charging: The BT-DN300 battery is built into the derailleur body with a charging port (EW-EC300 charger), so there is no separate battery pack to mount on the frame.
• Status at a glance: Integrated LED indicator displays battery level and system status, while the function button allows on-the-fly adjustments and syncing.

Semi-Wireless Di2 System

The RD-R7150 is the hub of the 105 Di2 system. The shift levers (ST-R7170) communicate wirelessly with the derailleur, while a single internal power cable (EW-SD300-I) connects to the battery housed within the derailleur body. This dramatically reduces the wiring required compared to traditional Di2 setups and makes installation straightforward on any road frame. The system is also compatible with higher-tier Shimano Di2 levers including Ultegra and Dura-Ace models.

Precision and Reliability

Electronic actuation removes the variables associated with mechanical cable systems — there is no cable stretch, housing compression, or friction to manage. Each shift is executed by a motor-driven mechanism calibrated at the factory, meaning the derailleur maintains its accuracy over the life of the drivetrain. The system also features automatic trim adjustment, eliminating the need to manually manage front derailleur rub.

Compatibility & Fit

The RD-R7150 is a 12-speed rear derailleur designed for use with the Shimano 105 R7100 Di2 groupset. Compatible shift levers include ST-R7170, ST-R8150, ST-R8170, ST-R8060, ST-R9250, ST-R9270, ST-R9160, and ST-R9180. Compatible cassettes include CS-R7100-12, CS-R7101-12, CS-HG710-12, and 11-34T variants of CS-R8100-12, CS-R8101-12, and CS-R9200-12. Compatible chains include CN-M8100, CN-M9100, CN-M7100, and CN-M6100. Supports cassettes up to 36T maximum low sprocket. Total drivetrain capacity is 41T, accommodating a maximum front chainring difference of 16T.