Super narrow lightweight 11-speed HG-EV symmetrical design chain for smooth shifts and maximum durability. Outer plate design has been developed to reduce the chance of chain suck. Sil-Tec surface treatment technology (PTFE plating) on inner and outer links and rollers that is smooth running and increases durability. Zinc-Alloy plated inner and outer links. Hollow pin for added weight saving. The inner plate has been developed for better contact with gears providing smoother shifting under high load, giving efficient pedalling, increased rigidity and near silent running. The SHIMANO HG901-11 chain receives a complete SIL-TEC treatment on its plates and roller for increased durability and efficiency. Its asymmetric design ensures smooth front and rear shifts while reducing drivetrain noise. Compatible with 11-speed drivetrains, the HG901-11 is also rated for E-BIKE use. Key Features HG-X11 special asymmetric plate design for 11-speed Rear drive Smooth driving without noise Front drive Preserve chain security at cross chainline Front & Rear Shift Smooth and reliable shifting SIL-TEC on Plate/Roller Hollow pin