Shimano 105 Di2 RD-R7150 12-Speed Rear Derailleur

The Shimano 105 Di2 RD-R7150 rear derailleur is an electronic derailleur for 12-speed road bikes, from the 105 Di2 R7100 groupset. It uses Direct Mount, meaning it mounts directly to the frame: check that your bike has this mount before buying. The rear derailleur is designed for anyone wanting to upgrade their drivetrain or replace a worn derailleur.

To choose, compare the tooth counts: the rear derailleur accepts a largest sprocket of up to 36 teeth (minimum 34), a smallest sprocket of up to 11 teeth and a maximum difference of 16 teeth between the front chainrings, with a total capacity of 41 teeth. Use the CN-M7100 HG 12-speed chain and EW-SD300 electric wire. The stated materials are aluminium and CFRP.

Founded in 1921 in Sakai, Japan, by Shozaburo Shimano, Shimano is still based in the same city today. For cyclists, it makes drivetrains, brakes, wheels, pedals and cycling shoes. Its history in bicycle components began with the production of freewheels in 1922.