SRAM RED AXS E1 POWERMETER 46/33 DM BK/SLIts the ultimate in integrated power measurement The RED AXS power meter kit adds Quarq technology to our one piece chainrings for the lightest, stiffest, and most accurate power package available 3 tooth delta on all chainring pairs ensures precise shifting for any setup, as well as a less dramatic change in cadence during front shifts X Range gearing technology gives you more range and a smoother gear progression, so youre always in the right gear