The KMC sprocket 38T 11/128 Bosch is an excellent chainring for E-bikes with a mid-motor and a crank with BDC 104. This chainring has a thickness of 3mm and is specifically designed for use in combination with the KMC e101 EPT chain and the KMC rear sprockets: Shimano and Nuvinci. With a lifespan of more than 10,000 km, this chainring is durable and reliable. The chainring has a black color and a BDC of 104 teeth. Product specifications - Brand: KMC - Primary base color: Black - Number of teeth: 55 - Receipt description: Chainring KMC 38t - Chainring BDC: 104 - Chainring type: E-bike