Power measurement is a crucial part of training, so SRAM made it as easy as possible to upgrade your Force AXS ride with Quarq technology. DUB-PWR takes the legendary reliability and accuracy of Quarq technology and inserts it into the crank spindle for clean integration that fits more bikes than ever. It’s invisible technology that adds minimal weight and will help you get to the finish line faster. FEATURES: DUB-PWR spindle-based unit measures left side power to calculate total watts Proven Quarq reliability and accuracy Long battery life (400+ hours) to power a season of rides Waterproof (IPX7 waterproof to 1 meter for 30 minutes) DUB bottom bracket (Sold separately) adds durability and simplicity Right crank arm, bottom bracket, spider, and chainrings non include