Wireless Bike Speedometer

I mean the wireless signal - how does it work?

Basically, there is a sender sending unit / that you attach to the front fork (in general), which generates a radio wave, regardless of the frequency of manufacturer designs. A magnet attached to the spokes of the wheel pulses and this signal was picked up by the receiver unit / usually mounted on the handlebars.

He is the head of unit, which is really the magic!

Count the number of pulses it receives (ie, laps) and compares with an internal clock, from that information (and the wheel size programmed in by the runner), it calculates speed and distance traveled.

Many also have a device to measure heart rate, this is achieved by a strap around the chest runners (with electrical contacts on the skin) that sends another pulse wireless unit and calculates your heart rate in beats per minute.

Some of them go one step further and have a magnet on the crank and a unit of the fixed wireless sender to the suspension chain, it will measure your pedal speed or cadence (in rpm) .

From this information, you can follow your progress and train more effectively.

I use a Polar that you can download information on a graph via a PC and adjust your driving accordingly.

Intelligent controls eh?

Hope this helps mate.

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The magnet on the wheel pass generates an electrical signal from the transmitter is sent by radio to the main unit, which is nothing more than a calculator / watch. Count the clicks in time and calculates the speed. Because he knows the size of the wheel, it can calculate the distance, etc.