Shimano GRX-610 12-Speed Right Rear STI Lever

The STI Shimano GRX-610 12s lever is a dual-control lever for gravel and cyclocross, with 12-speed mechanical rear shifting and hydraulic braking. It mounts on the right, where rear shifting is controlled, and forms part of a drivetrain that combines braking and shifting in a single lever.

The system uses mineral oil as brake fluid. The attachment uses a closed clamp with a diameter of 23.8-24.2 mm, and reach is adjusted with a 13.3 mm bolt and a 2.5 mm hex key. The SM-BH90-JK-SSR brake hose is not included and the recommended calliper is the BR-RX400. The pack contains 1 brake/shift lever and 1 gear cable. The weight of 610 g refers to a pair of levers, not a single lever. For the front shifting lever, choose the left-hand version.

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.