Working alongside our World Cup DH and Enduro athletes, e*thirteen engineered the new Helix Race GR Cranks. These Forged AL-6066-T6, CNC-sculpted aluminum cranks are designed for the rigors of downhill, big bike park laps, enduro, and freeride. The Helix Race GR shares the spindle design and low-profile shape with our top-end carbon and alloy cranks, with 83mm and 73mm spindle options. Helix Race GR cranks easily exceed ASTM 5 standard — a work of art made to take a beating. Exceeds ASTM 5 standards for Downhill, Bike Park, Enduro and Freeride applications Forged, CNC Machined, AL-6066-T6 arms and 30mm AL 7050-T7 spindle 73mm and 83mm spindle options for enduro and DH bikes Available in popular gravity crank arm lengths, Molded crank boots, protective polymer decals, APS adjuster, and self-extractor system included. 73mm crank requires a standard Helix chainring. Chainline 73mm spindle cranks: Helix Chainrings for 55mm chainline Chainring Compatibility 73mm spindle cranks: Helix Race, Helix Plus, or Helix Steel DM Chainrings Not compatible with SL or UL Chainrings Color: Sterling Silver Frame Compatibility 73mm cranks: All frames with 68/73mm BB shell Features Exceeds ASTM 5 standards for gravity use Forged and CNC machined for optimized strength-to-weight ratio and classic styling Molded crank boots for rock strike protection Adaptive Preload System (APS) Proven P3 Connect polygon spindle interface Included Crankset APS Adjuster BB/Lockring Tool Crank Boots (x2) User Manual Material Arms: Forged, CNC Machined AL 6066-T6 Spindle: 30mm AL 7075-T7 Spindle Specs Width: 73mm Diameter: 30mm Interface: P3 Connect Weight 73mm x 160mm: 584g