SRAM AXS X-Sync 12 Spd 107 BCD Chainring SRAM performed intense studies on chain retention and chainring wear patterns which led to the radical tooth profile of X-Sync chainrings. These chainrings last longer, run quieter and further improve chain retention. Features Chainring can be used with SRAM Eagle 12-speed or SRAM 11-speed chains107 B. C. D. SRAM X-Sync Technology - Refined tooth profile provides exceptional chain retention Part of AXS wireless electronic groupset36T to 44T options available Blast Black or Polar Gray options available | Sram | Axs X-Sync 1X 12 Spd 107Bcd Chainring | Blast Black | 44T, 107 Bcd, 1X, 12 Speed | Aluminum