SRAM Force AXS Wide Left Crank Arm Power Meter Spindle Assembly - 165mm 12-Speed DUB Spindle Interface Iridescent Gray D2SRAM Force AXS Wide Left Crank Arm and Power Meter Spindle Assembly 165mm 12 Speed DUB Spindle Interface Iridescent Gray D2. Power measurement is a crucial part of training so SRAM made it as easy as possible to upgrade your Force AXS ride with Quarq technology. DUB PWR takes the legendary reliability and accuracy of Quarq technology and inserts it into the crank spindle for clean integration that fits more bikes than ever. Its invisible technology