Quarq DFour91 Power Meter Crank Arms - BB30

Welcoming a new member to the SRAM family, Quarq breaks out the BB30 DFour91 Power Meter Crank Arms. Designed to amplify your Dura Ace 9100 riding experience, the DFour91 provides you with the power you need to up your training regimen and collect the information that's critical to pushing yourself harder, and further. While the DFour had older Dura-Ace and Shimano riders covered, it felt like those with a 9100 drivetrain were left on the back-burner, searching for a power solution that lands at the happy medium between price and precision, but fortunately those of us with an affinity for Japanese drivetrains and the most modern components can now grace our bikes with the leader in performance cranks with an economic price point. The DFour91, like the DFour, use a SRAM Exogram hollow carbon crank to ensure ultimate stiffness, but are set up with a 4-arm spider and the illusive Shimano 9100 BCD for running the chainrings you want. The DFour 91 encompasses five precisely placed strain gauges throughout its spider to measure exactly how many newton meters you're putting out when you put the hammer down. With in-factory calibration, they are designed to accumulate data within 1. 5% of total accuracy --a claim landing 0. 5% more accurate than most power meters on the market. Accurate power is well and good, but what makes it even better is the fact that the new design eliminates the requirement of constant calibration and zeroing offsets when the weather changes. Since race days may start early with frosty dew, and end in warm afternoon sun, or send us from warm meadows into drafty canyons, the ability for the internals to self-calibrate reduces the amount of time we need to spend coasting, or messing with our head units, so we can stay focused on the road ahead. These temperature calibrations are achieved thanks to Quarq's 10K Dynamic temperature compensation technology. It uses 10,000 data points that collect information on how the unit responds to temperatures flu...