Wolf Tooth Direct Mount Chainrings for Shimano E-Bike Motors have a 55mm chainline and are compatible with all Boost and Super Boost bikes that use the Shimano 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 Shimano Hyperglide+. The Drop-Stop ST tooth profile is only compatible with Shimano Hyperglide+ chains. Direct Mount Chainrings for Shimano 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 Shimano 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 Use Drop-Stop ST for use with Shimano 12-speed Hyperglide+ and 12spd KMC chains. Use Drop-Stop B for all 9, 10, and 11spd chains or 12spd SRAM Eagle, SRAM Flattop Road or Transmission (T-Type), KMC, Connex or Wippermann chains.
