"Jeff" Wrote in message:


"Chris Hogg" wrote in message
...
On Sat, 23 Jun 2018 16:08:44 +1000, "Jeff" wrote:



"The Natural Philosopher" wrote in message
news https://www.youtube.com/watch?v=_2l5bOhHNxU

Answer. not by very much, if at all.

But the radius clearly does vary significantly.

Does it?

It clearly does with the distance between the axle and the ground.

The perimeter certainly changes shape from being
near-circular to having a significant flat side against the ground,
but if the radius changed significantly, that would also mean a
circumference change,

No it does not. What happens is that the distance between
the rim and the outer flat surface of the tyre changes a lot.
That is very clearly visible with a flat tyre still on the car.

and the read-outs from the various gauges such
as speedometer and odometer would no longer be accurate.

That inaccuracy wouldn't be noticed even if it was
done from the wheel which has the flat tyre.

There are
also steel reinforcing belts beneath the tread that would have to
stretch if the circumference increased.

But the circumference does not increase when the radius where
the wheel touches the ground reduces significantly and visibly.



Hi woddles!
--
--
Jim K


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