Power on every ride. We've taken the reliability, elegance and features of Quarq's legendary shaft-based powermeter and lowered the barrier to entry once again. This new powermeter platform is fully housed in the DUB shaft for a clean integration that fits more bikes than ever before. It's an invisible technology that adds minimal weight and helps you get to your destination faster. With it, any eTap AXS bike can be retrofitted with power. The wave-based DUB-PWR unit measures the power on the left to calculate the total wattage.