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how does Campagnolo automatically detect the teeth on the bicycle sprocket?

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DiTBho:
50 minutes ago I was shocked at what I saw!

On my street corner I was all busy replacing the inner tube because some hipsters must have been drunk enough to leave thumbtacks lying around, when I saw a road bicycle parked near me, and its Campagnolo computer able to auto detect the teeth on the sprocket and show it on the LCD.

A serious rider shifts and picks gears by feel and intuition, and there is no real need to have indicators, what matters in the end is the cycling cadence, the number revolutions per minute that bike crankset / pedals spins. The actual selected gear is secondary.

Even because the gearing is continually adjusted up or down to maintain the optimal efficient cadence for the cyclist in question for the current terrain, pace and desired level of effort.

So, for this reasons, road bikes do not include unnecessary features, for the most part, but ...
... technically WOW, is it science fiction? How can it be? :o :o :o

Unfortunately, I don't speak French .. I couldn't make any interview to that lucky owner.

dave j:
I suspect it doesn't automatically detect the number of teeth on sprockets. The Campagnolo bike computer has wireless connection and there is a MyCampy app that lets you specify the exact bits you're using on your bike.

DiTBho:
Ahhhh so it's a trick  :)

wn1fju:
Typically there are wireless transmitters in the two shifters on the handlebars that send data to the bicycle computer.  Once you tell the computer your rear gear cluster range and the front chainring sizes, the computer can display what you have selected from the internal positions of the shifter mechanisms.  This kind of stuff has been around for several years...

But I agree with you.  I can usually tell pretty accurately from my workload what gear I am in and don't really need a cycle computer to tell me.  Besides, you can always simply tilt your head down and look at the gears!

thm_w:
There is some new obsession with head units recording: what gear you are in, what ratio, how many shifts you made, when you made them.
Most of it is just to say "hey we have a new feature, you'll have to buy the 2022 head unit to get it".
Maybe some fraction of people have use for it when training, should shift earlier here? who knows.

The more interesting aspect to me is:
- Shimano/SRAM/campag all fix their electronic shifters based on the number of gears.
This is pure marketing decision, because what you have inside the shifter is a small geared motor that is being told to move a certain distance when a shift signal is received (essentially).
On a 10 speed cassette it might be 3.95mm on 11 speed 3.7mm. Its a variable in the code somewhere.

A Chinese company decided on their model instead to let you enter that information yourself. So you can set 7 speed, 8 speed, 12 speed, whatever.
https://www.youtube.com/watch?v=eISsqEf3r7k

Now, the reliability of it is probably crap currently, but, at least they are fighting back against this idea of "must buy all the latest parts" to be compatible.

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