Shimano GRX-610 2-Speed Left Front STI Lever

The STI Shimano GRX-610 2s lever is a dual-control lever for gravel and cyclocross, with 2-speed mechanical front shifting and hydraulic braking. It mounts on the left, the front chainring side, and is designed for riders who want to control braking and shifting with a single lever on a double-chainring drivetrain.

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

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.