SRAM XX1 34T 11 Speed Chainring 76BCD. Dial in your gear range and match your terrain, wheel size and riding style with the SRAM XX1 11 Speed 34T chainring. Developed for maximum chain control, each tooth's thickness is precisely CNC machined to support the chain's inner and outer links perfectly. Each X Sync chainring fits a single, universal spider, allowing you to change rings without removing the carbon crank arm. New tooth profile alternates thickness by inner and outer links, providing maximum chain control.