Wolf Tooth Direct Mount Chainrings for Trek TQ E-Bike Motors are compatible with all Boost and Super Boost bikes that use the Trek TQ Motor. This brings a lightweight chainring with patented Drop-Stop technology to e-bike chainrings for the first time. Direct Mount Chainrings for Trek TQ E-Bike Motors are machined with 7075-T6 aluminum at Wolf Tooth in Minnesota, USA.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 chains55 mm chainlineItem SpecificationsColorBlackDefined ColorBlackDesigned for ebikeYesTooth Count30 Wolf Tooth Trek TQ Direct Mount Ebike Chainring eBike Chainrings and Sprockets UPC: 810006807080