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sram-red-quarq-gxp-172-5-34-50-bottom-bracket-not-included, SRAM Quarq Red CranksetsDoes not include bottom bracket, head unit or training softwareQuarq strain gauges and electronics (+/- 1.5% accuracy) are fully integrated in the spider, minimizing weight and maximizing durability and protection from the elementsWireless ANT+ technology is compatible with all industry standard receiving/display unitsANT+ ID is clearly visible to assist pairing with head unit during setupLED indicator in the spider signals power on and ready for setupDelivers left/right power comparison to compatible head unitsCalibration values are stored in the spider; no need to recalibrate if you change head unit or chainring sizesCoin-style battery (CR2032) lasts over 300 hours and is easily replaced