The sram quarq elsa 10r power meter crank arms to become a fitter and most importantly faster cycling during your training you must focus on intensity to see the best results and the best way to monitor how you are performing is through a power meter with the latest in market technology the quarq elsa 10r power meter provides you with the means to analyse your riding technique right down to the finest detail allowing you to make adjustments to ensure your ride as fast and as efficiently