Stiff, strong chainrings form the backbone of SRAM's front shifting ever. Rival 2x chainrings are a light, elegant one-piece construction so none of your effort goes to waste. A 13-tooth delta on all chainring pairs ensures precise shifting for any setup, as well as a less dramatic change in cadence during front shifts. One-piece construction for faster, smoother, more secure shifting. Crisp and accurate front shifts. X-Range gearing technology gives you more range and a smoother gear progression, so you're always in the right gear.. Item Specifications: Tooth Count: 48/35, Drivetrain Speeds: 12, Round or Oval: Round, Material: Aluminum, Color: Black, Defined Color: Black, Direct Mount Type: Direct Mount SRAM 8-Bolt,