Spin it up with the e*thirteen Helix Race Alloy Cranks. Featuring a 6061 aluminum construction and a 30mm 7075 T7 aluminum spindle, these cranks are lightweight, durable, and designed for high-level trail and enduro riding. They come with an APS preload adjuster and crank boots for serviceability and protection, and are available in three lengths and three colors for a custom fit.