Sram Quarq Riken BB30 Crank Arms are compatible with SRAM 10 and 11-speed road chainrings. Quarq strain gauges and electronics with +/- 1.5% accuracy are integrated in the spider, for minimum weight and maximum durability and protection from the elements. It's wireless ANT+ enabled, and interfaces with all industry standard receiving and display units. All calibration values are stored in the spider itself, meaning there's no need to recalibrate if you change heads or chainring sizes. It uses the coin-style CR2032 battery, which will last over 300 hours. Note: This purchase does not include the bottom bracket, head unit or training software.
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