You've been rolling with your Quarq power meter for some time, enjoying the perks of power, elevated training, and pushing yourself to the max, but you're ready to upgrade your drivetrain and feeling a little panicked at the thought of putting aside your crankset to delve into Shimano's new Dura-Ace 9100 groupset. Fortunately, you don't have to worry too much about a total overhaul in the crank-zone with the Quarq DFour91 Power Meter Spider. This sentient spider pairs with the 8-bolt Quarq crankset you already have decked out on your bike, enabling you to run Dura-Ace 9100 or Ultegra 8000 chainrings on your ride for top-tier shifting and control, with Quarq's newest technology and strain gauges for improved data accuracy. 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 fluctuating from zero to 130-degrees Fahrenheit, so the unit its self can determine where it needs to be in different weather and create an auto-adjust schedule based on atmospheric details. This lets the power mete...
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Quarq DFour91 Power Meter Spider
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Rising above a scene rich with extraordinary wildlife, pristine lakes, and alpine terrain, the Teton Range stands monument to the people who fought to protect it. These are mountains of the imagination. Mountains that led to the creation of Grand Teton National Park where you can explore over two hundred miles of trails, float the Snake River or enjoy the serenity of this remarkable place.
The pika is a close relative of the rabbits and hares, with two upper incisors on each side of the jaw, one behind the other. Being rock-gray in color, pikas are seldom seen until their shrill, metallic call reveals their presence.