Upgrade your e-bike drivetrain with our Bosch e*spec Direct Mount Chainrings. Our M3 narrow-wide tooth profile reduces weight without compromising on chain-retention. While the steel version is a direct OEM replacement, the premium aluminum versions provide cleaner aesthetics, lighter weight, and long-lasting performance perfect for when you're ready to upgrade from your original ring. Conquer your e-bike trails at a great price—power up your drivetrain now! PRODUCT SPEC Chainline Steel: 52mm Aluminum: 53mm (Boost chainline) Color Black Compatibility Bosch CX Gen4 Motor Material 7050 Aluminum Steel Mount QuickConnectTM Weight Aluminum: 34T: 123g 36T: 155g 38T: 188g Steel: 34T: 185g 36T: 210g 38T: 250g