Check the listing for details. Wolf Tooth Direct Mount Chainrings for E-Bike Motor. Condition: New. Listed at 84.95 USD. Wolf Tooth Direct Mount Chainrings for E-Bike Motors have a 55mm chainline and are compatible with all Boost and Super Boost bikes that use the EP8, E8000, and E7000 e-bike motor splines. The Drop-Stop B tooth profile is compatible with almost all 9-, 10-, 11-, and 12-speed chains – the only exception is Hyperglide+. The Drop-Stop ST tooth profile is only compatible with Hyperglide+ chains. Direct Mount Chainrings for E-Bike Motors are machined with 7075-T6 aluminum at Wolf Tooth in Minnesota, USA.Compatibility Compatible with all Boost and Super Boost bikes that use the EP8, E8000, and E7000 e-bike motors. Chain compatibility with all 9-, 10-, 11-, and 12-speed chains based on tooth profile selection. 55mm chainline. Related Products WT-1 SHIPS TODAY! Order before 1:30PM EST, M - F, and this item ships the same day! HAVE A QUESTION?Expert customer service by bike experts! A Real Brick And Mortar Retail Bicycle Shop with people you can talk to! Contact Us! (9-5 Mon-Fri, 12-4 Sat & Sun EST) Chat With Us