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 11-speed rear derailleur with Di2 technology 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 High tolerance cold forged aluminium link plates and body construction is extremely light and durable 11-speed E-tube Di2 compatible Compatible with 11-speed HG chains Wide gear ratio compatible up to 11-34T For use with double chainset Weight: 287 g