Rival D1 DUB Left Arm and Power Meter Spindle Assembly

The Rival AXS power meter upgrade integrates Quarq's DUB-PWR spindle-based unit into a left crank arm, measuring left-side power and calculating total wattage without requiring a right arm, bottom bracket, spider, or chainring replacement. The upgrade path keeps cost down by isolating the power meter to the single component that needs to change, available in standard and Road Wide crankset fit. Weight impact stays under 40 grams over a standard crankset, and the unit runs on ANT+ and Bluetooth connectivity with a user-replaceable AAA battery rated for 400-plus hours.

What Our Gearhead® Experts Are Saying:

"I've logged a full season of structured training on this unit's numbers without a single result that made me question the data against a dual-sided setup. Left-side estimation from Quarq holds up as trustworthy training data, not a compromise I have to account for."