Quarq has added another option to their crank spider based power meter offerings. Already stocking units for a variety of SRAM cranksets (including the new XX1 mountain bike version) Specialized and Cannondale, now you can add Dura-Ace DA9000 to the mix.
The unit gets all the new technology introduced with the XX1 model, including the multipoint temperature calibration to keep it accurate from 0º to 130º F (-17C to 54C) and accelerometer based cadence measurements. Those combine with their usual features – OmniCal (maintains accuracy regardless of chainring selection) and Power Balance (captures left and right side strokes independently).
You will have to swap to their ExoGram hollow carbon crank arm, but if you’ve already got the Shimano crankset, then at least you won’t have to buy new chainrings. Yes, SRM has offered 11-speed DA power meter cranks since last fall with a version of Shimano’s crank to maintain the aesthetic, but they’re double the price…
The other difference between this and the SRM option is the Quarq gets a replaceable battery.
The accelerometer based cadence capture is claimed to be accurate up to 160rpm, and all older models can be updated to capture that data without a magnet on the frame. It’s a firmware update, and now they’ve made it easier than ever to perform it through their Qalvin software. Now available on more platforms, Qalvin 1.5 updates to add Windows and Mac desktop compatibility, and is still a free download and still available as an iOS or Android app, too.
SRAM/Quarq also had the best USB drive we received at Eurobike.