The SRAM power meter is accurate to +/-1.5% and isn’t affected by temperature changes, and the consistent 13-tooth gap on the rings ensures fast and reliable shifting. Our integrated rings are also incredibly long-lasting. FEATURES: Power meter is fully integrated into the chainring for lighter weight Power readings are accurate within +/-1.5% and aren’t affected by climate conditions during a ride Measures right and left leg power balance X-Range gearing technology gives you more range and a smoother gear progression, so you’re always in the right gear SPECS: Material: Aluminum Round or Oval: Round Color: Black Direct Mount Type: Direct Mount SRAM 8-Bolt Drivetrain Speeds: 12 , 13