Shimano steps sm cre70 e7000 chainringready to deliver crisp, reliable performance on e mtbs, this shimano electric bike chainring has the extra strength and rigidity that's needed for the higher torque that e bikes deliver through the drivetrain. Specifically designed for use on e7000 chainsets, this high quality chainring provides excellent power delivery and chain retention over rough terrain.featureschainring for steps fc e7000 chainsetsteel teeth and alloy spider construction for rigidity, lightweight and durability9,10 and 11 speed chain compatiblechain ring fixing lock nut not includedfor 53mm chain linemanufacturer's code smcre70b34a 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products.buy shimano components from chain reaction cycles, the world's largest online bike store.