The Shimano HG601 105 5800 11 Speed Chain is a super narrow lightweight 11-speed HG-EV symmetrical design chain for smooth shifts & maximum durability. The outer plate design has been developed to reduce the chance of chain suck & Sil-Tec surface treatment technology (PTFE plating) on Zinc Alloy inner & outer links & rollers makes sure the chain stays running smooth & increases durability. The inner plate has been developed for better contact with gears providing smoother shifting under high load, giving efficient pedalling, increased rigidity & near silent running. This chain has a total width of 5.62mm, optimised for 11-speed Super Narrow HG-EV drivetrains to give its full potential & can now be used with the higher torque generated by E-Bike drivetrains.