Adding power measurement to a gravel bike used to mean compromising on weight or dealing with complex installations. The Stages Power L GRX addresses both issues by bonding a Gen 3 power meter pod directly to a Shimano GRX RX810 left crank arm, creating a single unit that swaps onto your existing crankset in about ten minutes. Remove your current left arm, bolt on the Stages version, pair it to your head unit, run a zero calibration, and you're collecting power data. No magnets, no additional sensors, no routing cables through the frame.

The Gen 3 electronics pack strain gauges and an accelerometer into a low-profile housing that adds just 15 grams to the base crank arm weight. That accelerometer handles cadence measurement without magnets, eliminating one more thing to install and align. The radio transmitter runs six times stronger than previous Stages generations, which translates to more reliable connections with bike computers and watches, especially in environments where signal interference can cause dropouts.

Active Temperature Compensation runs continuously during your ride, automatically adjusting readings as conditions change. Temperature swings that would throw off uncorrected power meters get handled in firmware, so your data stays consistent whether you start a ride at dawn in cool air and finish in afternoon heat. Stages calibrates each unit individually before shipping, targeting plus or minus 1.5 percent accuracy across the 0 to 2500 watt measurement range.... Read More