Shimano Chains - 6/7/8, 9, 10-SpeedShimano CN HG71 6 7 8 Speed Chains Bomber Bandit Gladiator Designed for precise Hyperdrive SIS and Dual SIS Index shifting This 8 speed chain meets durability requirements for e bike use when used with a pressed in pin instead of the included 'quick link , Shimano CN HG53 9 Speed Chains, 116L Silver Photon Hyperglide 9 Speed chain Optimized chain for HG sprocket which provides a fast and precise rear shifting performance (especially during downshifts)