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