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Quarq DFour Power Meter Crank Arms - GXP

item #QRQ0016
Price: $999.99 Buy Quarq DFour Power Meter Crank Arms - GXP
Quarq DFour Power Meter Crank Arms - GXP
Quarq DFour Power Meter Crank Arms - GXP description:
Few brands in the power meter game combine function with price as well as Quarq, but--since the brand is part of the SRAM family--every new generation of Quarq tech means Shimano riders may be in danger of being left with less effective or more expensive options. The DFour Power Meter Crank Arms for GXP bottom brackets assuage those worries by bringing the latest Quarq power meter model to those of us who insist on Japanese drivetrains. The crank arms themselves are all SRAM; they're built with the same Exogram construction process used in the brand's top groupsets, so it saves around 200 claimed grams over the aluminum model. The DFour is, essentially, the DZero model but with one fewer chainring bolts and a bolt circle diameter (BCD) that fits Shimano's latest generation of 11-speed road chainrings, specifically Dura-Ace 9000 (sorry, no 9100 compatibility yet), Ultegra 6800, and 105 5800. Except for that compatibility difference, the DFour incorporates every piece of technology Quarq crams into the DZero. Chief among these is the power meter itself, which saw a healthy amount of retooling. Overall, Quarq claims that "150 documented improvements" inform the evolution from the previous models to DFour, but the most important is to the heart of the meter itself: the strain gauges and measurement circuitry. It still incorporates five strain gauges strategically placed throughout the spider in order to measure the Newton meters you're throwing into the pedals. It's also still got the same claimed accuracy of +/- 1. 5%, so its numbers are 0. 5% more accurate than most meters, but the new design requires less correction in order to maintain accuracy in drastic temperature changes. Fewer corrections mean the DFour also better rations battery life than Quarq's previous power meter models, though when the battery does go out, you can still change it without tools or having to ship the whole thing to the manufacturer. As with the DZero model it's based on, the DFour syst...



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