Unidirectional carbon fiber arms and aluminum chainring spider provide excellent strength-to-weight. X-Glide tooth profiles and shift assist pins enable quick and reliable front shifting. Features: "Hidden" chainring bolt threads into crank arm to enhance chainring stiffness Chainrings are optimized for Yaw front derailleur Q-factor is 145mm Specs: Chainring BCD130 Drivetrain Speeds11 ColorBlack Number of ChainringsDouble Chainline/Hub Compatibility130 Hubs Defined ColorBlack BB IncludedNo Pedal Spindle9/16" Chainline/Hub Compatibility135/142 Road Disc Hubs > 415 mm Chainstay Weight699 Crank Intended UseRoad Crank Length (mm)165mm Rings53/39 Spindle Interface TypeSRAM/Truvativ GXP