Shimano 105 11 speed super narrow road chain. This Super Narrow HG-X11 directional chain offers precise shifting and improved durability thanks to SHIMANO's SIL-TEC treatment on the inner plate surfaces. Features System engineered drivetrain component for optimal power transfer. Inner-plate treated with SHIMANO's ultra-low friction surface treatment "SIL-TEC" (inner plate). Same durability as current 10-speed chain. Smooth and precise front and rear shifting. Directional chain. Shimano GRX 11-V series. E-Bike RD system compatible. Real weight: 264 g (116 Link). Technologies HG-X Chain Further evolution of shifting performance A directional mountain bike specific 11-speed HG-X chain means smoother shifts, lighter weight and greater overall performance. HG-X directional chain: Outer side is optimized for front shifting and inner side is optimized for rear shifting. Sil-Tec Shimano’s ultra-low friction surface treatment. Superior to simple coating, Sil-Tec is an advanced plating process that improves system performance through the use of embedded fluorine particles. Sil-Tec products run smoother and wear longer in all conditions. Quick-Link Tool-free assembly for current chains provides great convenience to user.