You've been running with power in your cranks for a bit, but craving a drivetrain change. This can be a little tough to stomach, especially when you've been rolling with an expensive power meter that limits compatibility. If your setup involves a Quarq DZero DUB crankset, and Shimano's newest Dura Ace is catching your eye, don't worry, you don't need to lose out on your whole crankset, or compromise your drivetrain desires, with the Quarq DFour DUB Power Meter Spider you can bridge the gap. This spider enables you to keep running your DUB cranks with Shimano's Dura Ace 9100 drivetrains, so you don't have to make concessions anywhere.Spider must be paired with a compatible Quarq DZero DUB crankset with an 8-bolt interface and SRAM DUB bottom bracketNot compatible with SRAM's 3-bolt direct mount interfaceDFour DUB is designed for Dura-Ace R9100 chainringsBluetooth low energy technology and ANT+ wireless data transferMagicZero technology automatically checks and recalibrates your power meter as you ride no need to manually calibrateAxCad system provides no-magnet cadence dataUse the AXS app to easily update firmware and view power meter metricsMeasures power for both legs with +/- 1.5% accuracyUses a CR2032 battery that can be replaced without toolsOmniCal system allows you to swap chainrings without affecting accuracyIPX7 waterproof ratingCompatible Chainrings - Compatible with Dura-Ace R9100 chainrings. Works with Ultegra R8000 and 105 R7000 chainrings but will not aesthetically matchItem SpecificationsChainring BCD110 AsymColorBlack Quarq DFour DUB Crank Spider UPC: 710845839443