SRAM 48T X-Sync Aero Direct Mount Chainring Blast Black. SRAMs X-Sync Aero Road Chainrings are designed for provide maximum control when used with AXS road aero cranksets.X-SYNC wide-tooth narrow-tooth chainring technology provides maximum chain controlLaser-etched chainring finish is more durableX-Range gearing technology gives you more range and a smoother gear progression so youre always in the right gearImproved aerodynamics for time trial and triathlon