Shimano sm cre80 steps chainring fc e8000 e8050a genuine shimano part for use with fc e8000 and e8050 crank arms, this steel and aluminium constructed chainring features dynamic chain engagement to ensure that your chain remains firmly on the drivetrain. It's designed to work together with an optional chain retention device, e.g. Sm cde80, as part of your 1 speed configuration. Part of shimano's steps range, it combines with your e bike's chain system or for a smoother pedalling experience under more rugged enduro and xc conditions.features material chainring steel spider aluminium fixing bolts stainless steel fitting for derailleur shimano steps 10 11 speed bolt circle 104mm direct mount standard steps buy shimano components from chain reaction cycles, the world's largest online bike store.