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. Compatibility Chainring is compatible with only TQ Motor drive systems 55 mm chainline [snippet name="DropStop B ST"] Tech Specs Weights: 30t • 64g | 32t • 69g Material: 7075-T6 aluminum Made in the USA Patent and trademark information