SRAM's lightest, stiffest, and most durable chainring. Their one-piece construction ensures that 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. And the technology packed in makes this SRAM longest-lasting chainring set ever.Crisp and accurate front shifts. One-piece construction for faster, smoother, more secure shifting. 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, 50/37, Drivetrain Speeds, 12, Round or Oval, Round, Material, Aluminum, Color, Black, Color, Silver, Defined Color, Black, Defined Color, Silver, keyword search, AXS, Direct Mount Type,.