* Combine any length Quarq DUB crank arm with 110 BCD or 130 BCD DZero DUB power meter fortraditional 10- and 11-speed chainrings.* Magic Zero: Automatically check and recalibrates your power meter to ensure it is always accurate.* AXS™ app: Easily update firmware and view power meter metrics.* OmniCal: Swap chainrings without affecting accuracy.* 10K TEMPERATURE COMPENSATION: Each power meter is programmed with over 10,000 data points to eliminate temperature effects on power measurement.* For use with Red D1, Force D1, or Quarq D1 crank arms* SRAM Model ID: PM-DZ-SPDR-D1