SRAM 42 Tooth 107mm BCD x 4-Bolt 1x12-Speed X-Sync Chainring, Blast BlackSRAM's X Sync Road Chainrings are designed for provide maximum control when used with AXS road cranksets. X SYNC wide tooth, narrow tooth chainring technology provides maximum chain control Laser etched chainring finish is more durable X Range gearing technology gives you more range and a smoother gear progression, so you re always in the right gear Can be installed with a single tool, making gearing changes a breeze Chainring bolts not included Item