SRAM Rival AXS Power Meter Left Crank Arm and Spindle Upgrade Kit - 175mm, Dub Spindle Interface, Black, D1

DUB-PWR spindle-based unit measures left side power to calculate total watts
An elegant integrated design
Proven Quarq reliability and accuracy
Long battery life (400+ hours) to power a season of rides
User replaceable lithium AAA battery
0.74 kilograms