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The science of Stages

Our meters are refined. Smart. Downright miniature. Made from the same material as bulletproof glass. Simply put, Stages Power meters employ the most advanced technology in the power meter category, all while being accurate, reliable and the simplest to maintain and use.

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Stages Gen 3 Electronics.

Refined over the course of nearly a decade, our Gen 3 power meter electronics have state-of-the art radio hardware for enhanced signal strength, which ensures your power data consistently and reliably reaches your computer (or GPS watch) as well as an LED status indicator that shows pairing and battery status at a glance.

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Active Temperature Compensation*

*Don’t try this at home
Measuring power is easy in a controlled environment, but in real-world riding, weather conditions change constantly. The strain gages used in a power meter—regardless of whether it’s crank based, spider based, pedal or hub based—are made of metallic elements which are affected by even slight changes in temperature which, if not factored, can lead to inaccurate ride data. For this reason, Stages Power meters are equipped with Active Temperature Compensation firmware, which automatically adjusts for temperature changes during your ride, so you can trust your data.

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Very, very water resistant.

Like fluctuations in temperature, moisture is a reality in cycling – whether it’s caused by high heat and humidity or freezing cold rain. Stages power meters are designed to meet or exceed the IPX7 standard for water resistance and tested extensively in-house at our Boulder, Colorado facility as well as over thousands of miles out on the roads and trails.

ANT+ AND Bluetooth works with everything.

Stages was the first power meter brand to offer both ANT+ and Bluetooth transmission protocols. This simplifies the setup process and ensures that our power meters are compatible with a broad range of other devices, including smart trainers, phones, cyclometers and more. This also provides two-way communication for wireless firmware updates.

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Wattage 101 – Understanding Power

Simply put, power is a measurement – typically displayed in watts – of how hard you’re working on the bike, and the most accurate way to capture your true effort. Unlike heart rate, power is not affected by lack of sleep, dehydration, heat, stress or caffeine, And while heart rate changes can lag behind short efforts, power data is instantaneous. Power is the perfect tool to understand how you are progressing and the best indicator of fitness gained and fatigue level. Simply put, if you want to know how you’re doing, check your power.

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What is power?

The equation for power is pure physics:

POWER  =    TORQUE          x    CADENCE
P      =         2X[(F x 9.8 x L)  x    (R x .1047)]

P=Power, aka Watts.

TORQUE //  Fave x 9.8 x L = Torque
(Fave = Average Force per Revolution )x(9.8 = gravitational constant)x (L=Length of Crank)

To measure TORQUE, Stages’ proprietary strain gages are laid precisely along the crank arm. These gages, which are the same tool used in aerospace, can detect the smallest flex in the stiffest crank. In this case, every pedal stroke, causes a small amount of flex along the crank arm. This downward force happens in every rotation. This force, multiplied by 9.8m/s2 and the length of crank arm are used to determine the force applied to a pedal stroke, or torque.

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CADENCE  //  R x .1047 = Cadence
(R= Rotations — measured using an accelerometer)

Using an accelerometer (the same technology used to tell your phone how to orient its screen), the Stages meter measures cadence. The proprietary circuitry houses this cadence tool, allowing the meter to eliminate the antiquated need of magnets, external sensors, cables and zip ties to measure cadence. This modern technology also allows the meter to capture multiple positions per revolution, resulting in a faster response and better overall data. Once Cadence and Torque are collected, they are multiplied together to determine the POWER of a single pedal stroke.

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