Sram X-Sync, 11Sp, Direct Mount Chainring, For Single Speed, Aluminum* SRAM X SYNC 1x chainrings provide the highest level of performance and durability in the market* X SYNC tall square teeth edges engage the chain earlier than traditional triangle shaped teeth* The sharp and narrow tooth profile, as well as rounded chamfer edges, help manage a deflected chain* X SYNC chainrings have been designed with mud clearing recesses for the inner chain links and rollers* Direct Mount rings save 25 50g over spider and chainring