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 11-speed rear derailleur with Di 2 technology 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 High tolerance cold forged aluminium link plates & body construction is extremely light & durable 11-speed E-tube Di 2 compatible Compatible with 11-speed HG chains Wide gear ratio compatible up to 11-42T For use with single chainset Weight: 318