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...
After cobbling together a few hundred quid during his student days off the back of a hard winter selling hats (long story), Jack bought his first road bike at the age of 20 and has been hooked ever since. He was Staff Writer at 220 Triathlon magazine for two years before joining road.cc in 2017, and reports on all things tech as well as editing the road.cc live blog. He is also the news editor of our electric-powered sister site eBikeTips. Jack's preferred events are time trials, sportives, triathlons and pogo sticking (the latter being another long story), and on Sunday afternoons he can often be found on an M5 service station indulging in his favourite post-race meal of 20 chicken nuggets, a sausage roll, caramel shortbread and a large strawberry milkshake.