Sram Rival Left Arm AXS Power Meter DUB 175 DUB crankset blackSRAM Rival AXS Power Meter Left Crank Arm and Spindle Upgrade Kit 175mm DUB Spindle Interface Black D1. Power every ride with the SRAM Rival AXS Power Meter Arm and Spindle Upgrade Kit. This power meter platform is entirely contained within the DUB spindle for clean integration that fits more bikes than ever. Its invisible technology that adds minimal weight and will help you get to the finish line faster and can be used to upgrade any eTap AXS bike