Take a look inside Stages’ power meter assembly facility in Boulder, Colorado
Unless you slept through high school physics, the equation Power = Torque x Cadence should look vaguely familiar, even if you haven’t needed to use it since those awkward adolescent years. For Stages Cycling, that equation is much more than a foggy memory; it’s the cornerstone of the company, the calculation that their power meters perform thousands of times per ride.
Stages began by designing power meters for stationary bikes, the type used in commercial gyms. Taking the lessons learned from that product, they then launched their own crank arm mounted power meter in 2012. The device’s price, light weight, and weatherproof, wireless design helped it turn heads when it was launched, and over the last four years Stages’ athletes have brought home multiple World Championship medals in everything from road to enduro racing. Initially, the power meters were only available on aluminum crankarms, but Stages recently released their own carbon crankarm and power meter combination.
The basic principle behind a Stages power meter is fairly simple – a strain gauge is mounted onto a non-driveside crankarm, where it can detect even the smallest amount of flex. An accelerometer is used to determine a rider’s cadence, providing the second key part of the equation. Since the power meter is only mounted on one side, the number is multiplied by two, and the result is the amount of power (measured in watts) that a rider is putting out at any given moment. It sounds simple, but the execution is a good deal more complicated, due to the steps required to ensure that the device produces accurate, reliable data.
Read More – Source: Inside Stages Cycling – Pinkbike