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Quarq power meters using Quarq technology, measure power at the crankset spider. This is one of the best places on the bike to measure power because all your pedaling effort flows directly through the spider and it can be measured with great precision.
Quarq combines their power measurement technology with SRAM's topflight crank arms to create an integrated, high performance bicycle component, supported by a 2-year warranty and worldwide customer service.
In the past three years Quarq has powered world championships, cobbled classics, multiple stage wins in the Tour de France and Giro d'Italia, and two first place finishes at Ironman® Hawaii.