Stages GRX RX810/820 Power Meter LeftThe Stages Gen 3 Stages Power L GRX RX810 power meter integrates onto a non drive side Shimano GRX RX 810 crank arm. It provides consistent and accurate power measurement through automatic temperature compensation. This system is compatible with all Shimano GRX cranksets, offering data for various cycling disciplines. Calibrated individually, the power meter ensures a + 1. 5% accuracy level in all conditions. Its low profile design adds minimal weight