The KMC 38T/52mm 11/128 tooth sprocket is a high-quality chainring suitable for Bosch 4 systems. This chainring has a chromoly black finish, which gives it a stylish look. It is specifically designed for electric bicycles and has a chainline of 52.0mm. With 38 teeth, this chainring offers the perfect balance of speed and power. It is made of hardened chromoly steel, making it durable and reliable. This KMC chainring is an essential component for any Bosch Gen 4 electric bicycle. Product specifications - Size: 1/2" X 11/128" - Treatment: Chromolic Black - For Bosch 4 Systems - 4.5mm offset - Article number: BFCB45238 - EAN: 8719189051964 - Brand: KMC - Model: BOSCH - Type: GEN 4 - Bicycle type: Electric bicycle - Number of teeth: 38 - Color: Black - Number of gears: 0 - Primary base color: Black - Type: Bosch Gen4 - Material: Steel - Number of holes: DM Direct Mount - Number of teeth: 38 - Chainring type: E-Bike - Material description: Hardened Chromoly steel"