This KMC chainring is specifically designed for Bosch 3 systems. With a size of 1/2" X 11/128" and a 38-tooth sprocket, this chainring provides maximum efficiency and saves the battery of your e-bike. The chainring is made of hardened chrome steel and is perfectly matched to KMC chains. Featuring NTP (New Teeth Profile) technology and a chainline of 47.5mm or 50.0mm, this chainring is suitable for 9-10-11 and 12 speed systems. It is an essential part for anyone looking to upgrade their Bosch gen3 e-bike. Product specifications - Article number: BFCB20138 - EAN: 8719325812527 - Brand: KMC - Model: BOSCH - Type: GEN 3 - Material type: Steel - Bicycle type: Electric bicycle - Colour: Black - Number of teeth: 38 - Chainring type: E-bike