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
– Available in two different tooth profiles for optimal performance based on your chain type. 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.

DROP-STOP B
– Compatible 9, 10, 11, and 12spd SRAM Eagle, 12spd SRAM Transmission (T-type) Flattop, 12spd Campy, 12spd KMC
– Not compatible with 12spd Shimano HG+ chains

DROP-STOP ST
– Compatible with 12spd Shimano Hyperglide+ chain and 12spd KMC chain only
– Symmetric Trapezoidal (ST) tooth shape is optimized for Shimano HG+ chain

Tech Specs:
– Weights: 32t/87g | 34t/92g
– Material: 7075-T6 aluminum
– Made in the USA