The Wolf Tooth Direct Mount Chainrings for Shimano E-Bike Motors are precision-machined to deliver durability, performance, and ideal chainline integration for Shimano electric bike systems. Designed with a fixed 55mm chainline, they are compatible with Boost and Super Boost bikes running Shimano EP8, E8000, and E7000 motor splines. These chainrings are built from 7075-T6 aluminum and machined in Minnesota, USA, ensuring lightweight strength and exceptional longevity. Choose between two optimized tooth profiles: Drop-Stop B - Compatible with nearly all 9, 10, 11, and 12-speed chains except Shimano Hyperglide+ Drop-Stop ST - Specifically designed for Shimano 12-speed Hyperglide+ chains only Key Features: Electric Bike Motor Compatibility: Fits Shimano EP8, E8000, and E7000 motors for seamless electric mountainin bike drivetrain integration. 55mm Chainline: Optimized for use with Boost and Super Boost bikes, ensuring precise drivetrain alignment. Drop-Stop Tooth Profiles: Choose Drop-Stop B for broad chain compatibility or Drop-Stop ST for Shimano Hyperglide+ chains. High-Quality Construction: CNC-machined from 7075-T6 aluminum in the USA for maximum durability and performance. Not Compatible with Pivot Super Boost: Designed for wide compatibility but excludes Pivot bikes using Super Boost chainlines. NOTE: These chainrings are not compatible with Pivot bikes using Super Boost chainlines.