X-SYNC Direct Mount Aero Chainring 1xSram X SYNC 1x chainrings provide the highest level of performance and durability. The Sram X SYNC tall square teeth edges engage the chain earlier than traditional triangle shaped teeth. The sharp narrow tooth profile, as well as rounded chamfer edges, help manage a deflected chain. To provide the best possible performance in muddy conditions, the X SYNC chainrings have been designed with mud clearing recesses for inner chain links and rollers.