SRAM Cranksets Based on SRAM's S900 crankset, but uses Red chainrings Quarq CinQo spider with strain gauges provides 2 accuracy Wireless ANT technology is compatible with several Garmin power receivingdisplay units, as well as CycleOps Joule and Specialized Speedzone Pro Calibration values are stored in the CinQo, no need to recalibrate if you change head unit Coinstyle battery BA0124 is easily replaced, lasts about 500 riding hours Item S
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