• HISTORY

Many years research have been necessary to arrive at this product.

The first LOOK research on this product goes back to 1986 and the registration of a patent on power measurement in the hub. The first product marketed was the MAX ONE, in 1989, a date at which twas also used on the Tour de France. Since then, several laboratory products have seen the light of day, with some patented, before deciding, 3 years ago to start the design of a product intended for the market. The result of this work is the Keo Power.

• PRINCIPLE

Each pedal collects the power and the cadence, and transfers them to transmitters that send them wirelessly to the computer.

• ACCURATE MEASUREMENT

The Keo Power permits very accurate measurement of the power and cadence. Each axle is equipped with 8 strain gauges permitting very accurate measurement of the axle deflection and so of the forces applied to it.

The observed measurement deviations, whatever the value of the force and its point of application are less than 2%. The axle electronics are designed to measure forces up to 170kg, obviously the axle can support much larger forces. The cadence is measured using a reed relay placed in the body of the pedal.

Through the force and cadence measurement, the Keo Power is capable of giving the power. The information is then sent to the POLAR transmitter, which sends it wirelessly to the meter via the WIND protocol.

8 stress gauges per axle permit force measurement with very high accuracy (<2%)

The sensors measure the deformation of the pedal axle

All pedals are inspected and calibrated in production.

The Keo Power has been developed so that the impact of temperature on the measurement is as low as possible. For a +/- 5°C temperature variation there is no impact. Above this, the temperature can have an impact. A simple restart is sufficient to recalibrate the system.

• LEFT / RIGHT BALANCE

Because it measures the power on each axle, the Keo Power permits an indication of the left/right power distribution as a percentage. This will allow experienced cyclists to improve their pedalling technique.

Left / right power distribution in percentage: 53% of power developed on the left, 47% on the right

• EASY TO INSTALL, USE & SELF-CALIBRATION

The Keo Power is very easy to install, compatible with the majority of bicycles on the market and very easy to move from one bike to another, in contrast to systems that are found in the chainset or the hub.
Its fixing system is slightly different because it is necessary to orient the axle in a very specific position, then tighten the locknut. The tool delivered with the pedal permits the axle to be aligned perfectly with the chainset.

The Keo Power is designed to be compatible with chainsets with crank thickness less than 16 mm and length of 170, 172.5, 175 or 177.5 mm (Shimano, SRAM, Campagnolo, FSA ranges, etc.)

Calibration is done automatically when the system starts up. The Keo power is designed to limit the impact of temperature on the gauges.

Choice of crank length

• KEO STANDARD: EFFICIENCY, REALIBILITY, LIGHTNESS

The Keo Power possesses all the characteristics of a Keo. The platform surface is the same as the Keo Blade, which is one of the widest currently available (62mm), guaranteeing excellent stability and efficiency. The platform height is also the same as a Keo Blade (15.2mm). Finally the Keo Power is among the lightest power measurement systems on the market, with only 150g excess weight compared to a top of the range LOOK pedal that is already one of the lightest.

The axle has been the subject of special attention: 3 bearings, double seals. It has undergone exactly the same approval tests as the standard axles: Keo Power axles have only been approved after a 1 million cycle rotation test at 100rev/min with a load of 90kg on the centre of the pedal and eccentric rotation (which creates a shock at each turn). This test is much greater than the current standard: EN14781.

• COMPATIBILITY

The Keo Power is compatible with POLAR CS 500, CS 600 and CS 600X computers, so permitting the benefit of all these computers that are already available on the market.

CS 600X :
> For competitors and professional cyclists
> Very technical cardiac frequency data
> Displays power, cadence and L / R distribution
> Indicates slopes, their inclinations, and measures altitude.
> Delivered with Polar ProTrainer 5 software

CS 500 :
> For cyclists seeking to improve their training
> Fast, sure control using Rocker Switch navigation
> Displays the power and cadence
> Indicates the inclination of the slope and measures the altitude
> Compatible with www.polarpersonaltrainer.com

• DATA TRANSFER AND ANALYSIS

The transfer of data into the POLAR computers is done wirelessly using an infra-red key.

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