Wolf Tooth direct mount E-bike chainring compatible with Trek TQ motors, Boost and Super Boost frames.Lightweight E-bike crankset with patented Drop-Stop® technology.Technical Specifications.Mounting:Direct Mount.Use:E-bike.Compatible:Trek TQ motors.Compatible:Boost and Super Boost frames.Compatible:9, 10 and 11 speed chains or SRAM Eagle, SRAM Flattop Road or Transmission (T-Type) 12 speed chains, KMC, Connex or Wippermann.*NOT COMPATIBLE:With Shimano HG+ 12v chains and Campagnolo 13v chains.Chain line:55 mm.Tooth profile:Drop-Stop B.Weights and sprockets:30 t - 64g, 32 t - 69 g.Material:Aluminium 7075-T6.Drop-Stop B system for all 9, 10 and 11-speed chains or SRAM Eagle, SRAM Flattop Road or Transmission (T-Type) 12-speed chains, KMC, Connex or Wippermann.