SRAM Rival 1x XPLR AXS Power Meter Wide Crankset - 170mm 12/13-Speed 42t 8-Bolt Direct Mount DUB PM Spindle BLK E1SRAM Rival 1x XPLR AXS Power Meter Wide Crankset 170mm 12 13 Speed 42t 8 Bolt Direct Mount DUB PM Spindle Carbon E1. SRAM cut grams out of their Rival aluminum crankarms but didnt cut corners on power measurement. The light and accurate spindle based power unit nestles into the striking redesigned arms to give you the data you need and our newest direct mount chainrings are light and stiff while looking good. Spindle based power meter unit measures