SRAM's most advanced aluminum road crankset is their most stunning. Careful engineering has resulted in crankarms that optimize stiffness to weight ratio with material only where it’s needed. Integrated chainrings deliver flawless shifting in ranges that fit your needs with the whole package coming in over 50 grams lighter than the previous generation.Modern aluminum crankarms and aluminum 2x chainring optimizes stiffness to weight ratio with material only where it’s neededX-Range gearing technology gives you more range and a smoother gear progression so you’re always in the right gear2x aluminum intergrated chainring offers crisp and accurate front shiftsDUB bottom bracket adds durability and simplicity (Bottom bracket sold separately)45mm chainline Rings 46/33, 48/35 Number of Chainrings Double Drivetrain Speeds 12 Chainring BCD Direct Mount SRAM 8-Bolt Chainline/Hub Compatibility 135/142 Road Disc Hubs > 415 mm Chainstay Color Black Crank Length (mm) 160, 165, 170, 172.5, 175 Crank Intended Use Road BB Included No Pedal Spindle 9/16" Spindle Interface Type SRAM DUB Defined Color Black