Shimano® Dura-Ace® R9100A DZero power meter for Shimano® Dura-Ace® R9100 series. Combine the Exogram carbon Quarq DZero DUB crank arms with a Quarq DFour DUB power meter spider. Accurate and InnovativeQuarq’s DZero platform, combines with SRAM’s DUB™ technology brings you one of the most accurate and innovative power meters. The Quarq DZeroDUB power meters are lighter, stiffer, and stronger than ever. AdaptabilityWith a simple selection of the power meter spider that works best with your bike, a crank arm assembly of your choice in length and chainrings to suit, you can now power every ride. A Companion Digital WrenchWith the SRAM AXS app you can set the zero offset, check battery voltage, run diagnostics and perform firmware updates. New Features• DUB™ crank arm assemblies – stronger, stiffer, lighter. • A simplified product line – choose a power meter spider and preferred crank arm length • MagicZero™ – automatic calibration as you ride. No need to back pedal or manually calibrate through your headunit Technology • DZero is packed with 10 years of technical innovations and 150 documented technology iterations. • Now combined with SRAM’s DUB™ technology – stronger, stiffer, lighter. • Durable: IPX7 waterproof rating • Warranty: 2-year warranty, free firmware updates and acclaimed worldwide support.