The SRAM RED AXS power meter is a huge step forward in power meter design, giving riders the gearing they truly want and need. Shifting performance has been optimized by moving the range from the front of the drivetrain to the back, and creating a consistent 13-tooth gap across all variants of chainring duos. The crankset is designed specifically for electronic shifting, with Quarq premier DZero power measurement technology fully integrated.Features-X-Range gearing technology gives you more range and a smoother gear progression, so you’re always in the right gear-Power meter is fully integrated into the chainring set-ANT+ and BLE-Power balance measures left and right legs separately -Power readings are accurate within +/-1.5% and aren’t affected by climate conditions during a ride-Integrated chainring design significantly reduces weight -Unique chainring shape results in a lighter weight, stiffer, more durable crankset -Carbon crank arms and aluminum chainrings are lightweight-DUB bottom bracket (not included) adds durability and simplicity-45mm chainlineItem Specifications-Pedal Spindle:9/16"-BB Included:No-Chainring BCD:Direct Mount SRAM-Color:Natural Carbon-Defined Color:Carbon-Crank Intended Use:Road-Number of Chainrings:Double-Crank Length (mm):165mm-Rings:46/33-Drivetrain Speeds:12-Spindle Interface Type:SRAM DUB-Chainline/Hub Compatibility:130 Hubs,135/142 Road Disc Hubs <415 mm Chainstay