Shimano GRX, with its gravel specific ergonomics, optimized gearing options, rugged reliability, and quiet and stable drivetrain, sets itself apart from the rest of the component world Low profile Shadow Plus design 10-speed rear derailleur for fast and precise shifting performance Shadow Plus uses a chain stabilising switch that when on will reduce chain bounce in rough terrain maintaining more stable drive and shifting Compatible with 10-speed HG chains Wide gear ratio compatible up to 11-36T For use with double chainset Weight: 303 g