SRAM RED 1x XPLR AXS Power Meter Wide Crankset - 170mm, 13-Speed, 40t Threaded Mount, 8-Bolt PM Spider, DUB Spindle,Tracking your progress on gravel just got easier and more accurate. With our new spider based power meter and removable Thread Mount chainrings, the RED XPLR AXS power meter is lightweight, reliable in all weather, and accurate within + 1. 5%. With dual sided power measurement, even your loftiest of gravel training goals are within reach. When SRAM found ways to make their lightest and stiffest crank even lighter, they went for it. A new process