SRAM Rival X-Sync Direct Mount Road Chainring - 40t, 12-Speed, 8-Bolt Direct Mount, 6.5mm Offset, Black, E1SRAM's light, stiff, and durable Rival X Sync direct mount aluminum road chainrings let you pick the exact gearing you want and quickly swap sizes. Our X SYNC technology keeps the chain where you need it to be, too. X Sync wide tooth, narrow tooth chainring technology provides maximum chain control Aluminum, laser etched chainring is designed to be more durable X Range gearing technology gives you more range and a smoother gear progression, so you re