SRAM Rival AXS E1 2x Powermeter Spindle Crankset giantpromo emailrep The brand new "Windsock2" aero SR006218060001 The brand new "Windsock2" aero oversocks are designed absolutely from scratch and are a complete redesign of the now outdated (but much loved) original Spatz Windsocks Its incredible characteristics and versatile application possibilities made it the benchmark on the streets of the world featuring an integrated power meter on the left side for detailed performance trackingUtilizes ANT+ and Bluetooth protocols for seamless connectivity with a wide range of devicesOver 400 hours of operating time on a single AAA lithium battery ensures long lasting performanceRecommended inner bearing: SRAM DUB for optimal compatibility and efficiencyConstructed from lightweight aluminium for both axle and crank arm you can trust the power data (left side) to fine tune your training or racing efforts for optimum performance