Stages Power, a power meter for every rider. Used by Team SKY.
The Stages Power meter is primed to bring power-based training to all disciplines of performance cycling. With advanced technology and simple elegant design, the Stages Power meter is perfect for any cyclist whether looking for their first power meter or a savvy power-training expert wanting to add power measurement to a second MTB, ‘cross or DH bike. Regardless of what piqued your interest in power measurement, you’ll find the Stages Power meter to be the lightest, smallest, most technologically advanced unit available today. No matter your cycling passion — we have a Stages Power meter for you.
THE SCIENCE OF STAGES
'OUR METER IS: DOWNRIGHT MINIATURE. UNDER 20G. WITHOUT MAGNETS. MADE FROM THE SAME MATERIAL AS BULLET PROOF GLASS. SIMPLY PUT, THE STAGES POWER METER SPORTS THE MOST ADVANCED TECHNOLOGY EMPLOYED IN THE POWER METER CATEGORY, ALL WHILE BEING ONE OF THE EASIEST TO MAINTAIN AND SIMPLEST TO USE.'
WITH NO MOVING PARTS, AND EVERYTHING PROTECTED BY OUR HIGH-STRENGTH ABS-PC HOUSING, THE STAGES POWER METER PRESERVES THE STRUCTURAL INTEGRITY OF THE CRANK—ALL WHILE SEAMLESSLY ADDING THE ABILITY TO MEASURE YOUR POWER.
Power is a measurement of the work you do on the bike, and the most accurate way to measure your effort. Unlike your heart rate, which can be widely affected by physiological influences, including: stress, lack of sleep, caffeine, temperature, time of day, dehydration and other factors, power shows exactly how much work you are doing and exactly what you are getting out of your training. 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.
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.
CADENCE // R x .1047 = Cadence
(R= Rotations — measured using an accelerometer*)
Using an accelerometer (the same technology used to tell your smart 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. We then multiply this number by 2 with the assumption of doubling the left leg power. This one assumption, that both legs produce relatively the same force, is the key factor that allows Stages Power to be more compact, lighter, more robust, and more economical than any other power meter on the market. This assumption has been fair and consistent for most of the riders on the road.
ANT+ / BLUETOOTH CONNECTIVITY
The Stages Power meter is the first power meter to use Bluetooth Smart protocol in addition to ANT+.
ANT+ is the gold standard for over-the-air communication in the cycling and athletic industries. The system is simple, robust, and provides for riders the ability to add power to their ANT+ devices.