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John Rumm John Rumm is offline
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Default Does a tyre change its CIRCUMFERENCE when underinflated?

On 23/06/2018 06:56, The Natural Philosopher wrote:

https://www.youtube.com/watch?v=_2l5bOhHNxU

Answer. not by very much, if at all.


So the short answer to your question is "yes".

This seems to be a perpetual urban myth.


Which you have just agreed with by claiming there is a small change.

It tyre pressure sensors are using this, it has to be a very very
complicated bit of software to detect - say - less than 1% change in RPM
relative to the other wheels.


Can't see that being too difficult in itself - especially as you
probably have input from other sensors and know the steering angle input
and so can assess when you are driving straight and not under high
acceleration etc.

Type pressure monitoring will need to be more sensitive to rate of
change than absolute difference since unequal tyre wear would otherwise
be flagged.


--
Cheers,

John.

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