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.

This seems to be a perpetual urban myth.

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.



I wasn't impressed by a bloke pushing a van who shows no signs of
understanding the meaning of "resolution". OTOH put "tyre rolling
radius pressure" in a well-known search engine[1] and the first hit is
a paper from University Politechnica of Bucharest giving the variation
in rolling radius for a range of pressures and speeds on a dynamometer[2].


Includes:

"When the inflation pressure is changed by ± 30 % with respect to the
nominal value, the increase of dynamic rolling radius has relative
values ranging between 0.88 % and 0.95 %, therefore close to 1 %.
It can be asserted that, for all the considered values of rolling speed,
the inflation pressure has an important influence on the tyre dynamic
rolling radius."




[1] I looked for it after reading the thread in u.r.c.maintenance about
pressure monitors, not in response to your "fake myth"

[2] G Anghelache and R Moisescu 2017 IOP Conf. Ser.: Mater. Sci. Eng.
252 012014

iopscience.iop.org/article/10.1088/1757-899X/252/1/012014/pdf

--
Robin
reply-to address is (intended to be) valid