The 5DEV Zink Signature Freeride Crank is built for Specialized Levo Gen 4, Bosch, TQ, and Avinox motor systems, CNC machined from 7075 aluminum in San Diego. The stronger alloy handles the lateral loads and impacts that freeride and aggressive descending put through a crank without adding unnecessary weight to the front end of the drivetrain. What Our Gearhead(R) Experts Are Saying:"On a heavy E-MTB hitting big hits and drops, the crank is one of the first things to show stress. 7075 aluminum machined to this tolerance holds up where softer alloys start to creak and flex. Levo Gen 4 fitment is confirmed out of the box, so there's no adapter guesswork before the first ride."