SRAM X01 X-Sync 34T 94BCD 11 Speed Chainring: These chainrings have been developed for maximum chain control, with each tooths thickness being precisely CNC-machined to support the chains inner & outer links perfectly. The SRAM X01 drivetrain carries on the tradition of SRAMs championship-winning 1X philosophy-all the way down the mountain. The setup is simpler. The drivetrain is lighter. & the shifting is fast & solid. Bottom line: X01 is the right one for any terrain, every time. Five available chain rings (30-32-34-36-38) allow you to tune your gear range to match your terrain, wheel size & riding style. Each X-SYNC chainring fits a single, universal spider-allowing you to change rings without removing the light-weight carbon crank arm. X-sync A CNC-machined, "wide tooth, narrow tooth" pattern is repeated around the entire chain ring, perfectly mirroring the chains inner & outer links for maximum control. New tooth profile alternates thickness by inner & outer links, providing maximum chain control CNC-machined rings with extra machining to reduce weight 94BCD