The Shimano 105 RD-R7150 is a 12-speed electronic rear derailleur for Shimano 105 road drivetrains. It uses Shimano’s semi-wireless Di2 setup, where the shift levers send shift commands wirelessly while the rear derailleur itself is wired to the battery system. This makes it a practical choice for riders who want electronic shifting on a road bike without moving to Shimano’s higher-priced groupsets.

This derailleur is designed for Shimano 105 R7100/R7150 2×12 road systems and is listed by Shimano as compatible with cassettes up to 36T. Shimano also describes it as a SHADOW RD design with a low-profile body that helps reduce exposure in crashes and tight clearances. The medium cage and 41T total capacity make it suitable for common road gearing ranges, especially compact and mid-compact setups. For installation, it uses a standard hanger mount and is intended for modern road frames with a derailleur hanger.