Drive trains on e-bikes with strong mid motors are subject to enormous constant load. KMC hardened cromoly steel rear sprocket, designed for smooth shifting of Shimano internal gear hubs even under the high chain tension of e-bikes. Drivetrains on e-bikes with strong motors are subject to enormous constant load and this sprocket is a perfect solution for replacing /upgrading your current sprocket. Can also be used with non-motorised Shimano internal gear hubs. These Direct mount rear sprockets are compatible with either Super Narrow (Multi Speed) chains or Wide (Single Speed) chains. Specifically designed to be compatible with Shimano E-Bike systems, the KMC Narrow chainring is a perfect solution for replacing or upgrading your current rear sprocket Combine with a KMC chain and vastly increase your drivetrains mileage to over 3,500km Compatible with Shimano internal gear hubs & e-Bikes Perfectly matched to KMC chains for maximum efficiency which saves battery Size: 1/2" X 3/32" (Narrow)