SRAM Rival Crankset E1Modern aluminum crankarms and aluminum 2x chainring optimizes stiffness to weight ratio, with material only where its needed X Range gearing technology gives you more range and a smoother gear progression, so youre always in the right gear 2x aluminum intergrated chainring offers crisp and accurate front shifts DUB bottom bracket adds durability and simplicity (Bottom bracket sold separately) 45mm chainline