Sram's digital data sub-brand Quarq now has seven power meter options with the addition of the DFour91 for Shimano Dura Ace 9100, and a spider to fit the latest Specialized S-Works chainrings.
The full DFour91 comes with crank arms, a built-in AxCad cadence sensor (so no extra cadence magnet is required) and a battery with 200 hours of juice. If you already have an 8-bolt power meter, you can just buy the four-bolt spider and upgrade to DFour91. DZero uses bluetooth and ANT+ wireless data transfer, and there is Quarq's very own Qualvin app to manage free firmware updates and installation of the unit. A compatible Sram bottom bracket must be used to fit the system.
Both new power meters embody 10 years of Quarq advances in power meter technology, plus features such as dual Bluetooth low energy and ANT+™ wireless data transfer, Quarq’s latest measurement circuit, and the Qalvin BLE app. Riders also get AxCad accelerometer cadence, the easy-to-replace CR2032 battery, an IPX7 waterproof rating and a 2-year warranty.
The spider option for Specialized has all the same features as the Dura-Ace version and bolts straight on to S-Works chainrings, replacing the standard spider that comes with the crankset. It's available in 110 BCD and 130 BCD, and you'll need a Specialized lock ring tool to do the installation yourself.
“We’ve packed a long list of technology advances; 150 documented iterations; into the DZero platform. Riders love the platform, and we want to make it widely available,” says Jim Meyer, the founder of Quarq.
Quarq say both the DFour91 and DZero for Specialized options are available now, however we having spotted any in stock amongst UK retailers yet or seen UK pricing, so we'll be keeping our eyes peeled...
Arriving at road.cc in 2017 via 220 Triathlon Magazine, Jack dipped his toe in most jobs on the site and over at eBikeTips before being named the new editor of road.cc in 2020, much to his surprise. His cycling life began during his students days, when he cobbled together a few hundred quid off the back of a hard winter selling hats (long story) and bought his first road bike - a Trek 1.1 that was quickly relegated to winter steed, before it was sadly pinched a few years later. Creatively replacing it with a Trek 1.2, Jack mostly rides this bike around local cycle paths nowadays, but when he wants to get the racer out and be competitive his preferred events are time trials, sportives, triathlons and pogo sticking - the latter being another long story.