Provides riders with accurate, live power data delivery housed in SRAM's most advanced aluminum crankset Power meter technology is integrated through what is called “DUBPWR”, a unique design that elegantly houses Quarq’s reliable and accurate power measurement inside the DUB crank spindle itself Measuring leftside power to calculate total watts, it’s subtle, lightweight, compatible with any chainring setup, and boasts unbeatable battery life Compatible with the Flight Attendant system, allowing for total connectivity between all AXS enabled components BB and BB DUB spacers are not included 174mm QFactor 2Guards