Converting a Basic Bike computer to count Cadence

[Cruzer]

I read that it is possible to configure a basic standard (no cadence) bike computer to work as a cadence counter.

 

I want to use an old computer on my trainer.

 

Anyone know how to do this?

[fandacious]

it would be a wheelsize setting. then instead of speed you would get cadence

[Gman1834]

It should be possible, you can change the circumference input. In what unites do you enter the circumference?

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It wont show rpm but km/h and with some conversion you should be able to get the cadence.

[Guest Big H]

It was described in a bike mag quite a while ago. I will look for info.

[Saffa_G]

and u post this under group rides?????  go figure?

[Dirtbreath]

Can you set your circumference to 1m? Your speed at this circumference will give you your actual cadence.

[Tumbleweed]

it would be a wheelsize setting. then instead of speed you would get cadence

 

 

 

a wheelsize setting that matches the circumference/rotation of a crankarm? am interested to see how it works.

[Cruzer]

I dont get it.

 

When I revive this computer with a new battery and I switch it on for the first time its going to need me to input info,right?

 

I would normaly enter the wheel size so that it could calc speed as the wheel spins and the magnet moves past the pick - up

 

The method for cadence is similar only the magnet and pickup have to move to the actual pedal and the pickup would have to be close by on the frame in order to count the pedal/crank rotations.

 

My question what is input into the computer at initial setup in order for it to reflect actual cadence (although it is actualy calculating speed)

[Guest Big H]

one computer, one magnet. Set wheel size to1667mm and readout to kmh. Speed indicates cadence eg 9.7kmh =97rpm cadence

 

Go and try this , I cannot guarantee as I have never used it.

 

[Tumbleweed]

I dont get it.

 

?

 

When I revive this computer with a new battery and I switch it on for the first time its going to need me to input info' date='right?

 

?

 

I would normaly enter the wheel size so that it could calc speed as the wheel spins and the magnet moves past the pick - up

 

?

 

The method for cadence is similar only the magnet and pickup have to move to the actual pedal and the pickup would have to be close by on the frame in order to count the pedal/crank rotations.

 

?

 

My question what is input into the computer at initial setup in order for it to reflect actual cadence (although it is actualy calculating speed)

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man, my head hurts after reading that. it would have to be something the computer is set for? ie the circumference of a crank (minus distance centre of pedal axle is from end of crank) rotation?

[Cruzer]

THANKS!! WILL DO.

[Dirtbreath]

Some computers have an actual circumference measurement while others have a ratio of some sorts.

[Tumbleweed]

Some computers have an actual circumference measurement while others have a ratio of some sorts.

 

 

 

mostly work with sigmas, and they have a table with codes. thought it was just a number (code) the computer would recognise. am i wrong?

[Gman1834]

If you input the wheel circumference into the computer use 1/60 or 1000/60 or 1000000/60 this will convert from km/h to rpm. I THINK IT SHOULD WORK

[Dirtbreath]

Never used a Sigma.

 

My Suunto uses an actual measurement in mm. It's all the same really. You just trick the computer into thinking the crank is the wheel. One rev of the crank is one rev of the wheel and the measurement/ration so that your cadence is your speed. POP POP POP!

[Gman1834]

Did it work?