Designed specifically for today's 11-speed systems, this Dura-Ace / XTR chain uses an asymmetric layout for better performance and better shifting performance.The chain also runs very quietly, because it has been coated with SIL-TEC, a new Shimano fluorine-based metallurgic surface treatment which decreases friction and increases chain life. Not only that, but SIL-TEC holds onto your lube better and longer, leading again to better chain performance. Shimano has added hollow pins to shed that extra weight, and included an extra quick link.DURA-ACE - 11-Speed - Super Narrow - HYPERGLIDE and SIL-TEC Road ChainThe 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.PRODUCT SPECIFICATIONSMODEL NO CN-HG901-11SERIES DURA-ACE R9100 SeriesAverage weight 247Chromizing treatment roller link pin ✔Type HG-X11 chainHollow pin ✔Pin link plate SIL-TECRoller and link plate: SIL-TECE-BIKE rear derailleur system compatible ✔Rear drive Smooth driving without noiseFront drive Preserve chain security at cross chain lineFront & Rear Shift Smooth and reliable shiftingHG-X11 Chain - Silky driving, accurate shiftingHG-X11 directional chain realize more smoother shifts and greater overall performance.Right and left sides are optimized for front and rear shifting respectively.SIL-TEC - SHIMANO’s ultra-low friction surface treatmentSuperior to simple coating, SIL-TEC is an advanced plating process that improves system performance through the use of imbedded fluorine particles.SIL-TEC products run smoother and wear longer in all conditions.Quick link includedSIL-TEC Coating for improved chain life, durability, lube retention and shifting performanceFor Shimano 11-speed road and mountain drivetrains (compatible with Ultegra, 105, XT and SLX, etc.)Compatible with E-bike systemsIncludes ONLY the items pictured and described.