This is the SRAM XX1 11 Speed Chainring. The SRAM XX1 was built with a dedicated 1X design philosophy
- making it simpler, lighter & more durable than any other. No matter where you ride, no matter what you're up against: SRAM XX1. Unstoppable. Developed for the maximum chain control, each tooth's thickness is precisely CNC-machines to support the chains inner & outer links perfectly. Six available chain rings (28-38) allow you to tune your gear range to match your terrain, wheel size & riding style.