Power on every ride. We have adopted the reliability, elegance, and features of Quarq's legendary spindle-based power meter and lowered the entry barrier even further. This new power meter platform is fully integrated into the DUB spindle to ensure a clean integration that fits more bikes than ever before. It is an invisible technology that adds minimal weight and helps you reach your destination faster. This allows any eTap AXS bike to be upgraded with power. The spindle-based DUB-PWR unit measures power on the left side to calculate total wattage.