i used the polar power meter for a season and felt that it was ok while i used it.i wanted to go to the powertap.after i did, i realized that polar was way off.i know this because polar's website claims about 10% accuracy and powertap was 1.5%.turns out my lactate threshold was about 10-15 watts below what polar was registering.not cool.Click Here to see more reviews about: Polar Power Output Sensor
Product Description:
The new Polar Power Output Sensor system was designed to make you a better cyclist. This system, along with the S720i, will redefine the way you train by combining heart rate and power (wattage) data side by side. All of the drive force of the bike is transmitted through the chain, allowing the S720i to calculate watts very accurately. The sensor positioned on the rear pulley works magnetically and measures the speed of the chain. The chain stay sensor calculates the tension of the chain by measuring the vibration as it passes over the sensor. The user will enter one time during set up: chain length, chain weight and the measurement between the bottom bracket axle to the rear wheel axle. A chart in the manual will help provide some standard parameters.
About Polar
The first EKG accurate wireless heart rate monitor was invented by Polar back in 1977 as a training tool for the Finnish National Cross Country Ski Team. The concept of "intensity training" by heart rate swept the athletic world in the eighties. By the 1990s, individuals were looking to heart rate monitors not only for performance training needs, but also for achieving everyday fitness goals. Today, the same concept of heart rate training is being used by world-class athletes as well as everyday people trying to lose weight. Polar is the leading brand among consumers, coaches, and personal trainers worldwide and the company is committed to not only producing the best products, but also being the leading educator on the benefits of heart rate based exercise.
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