On Wed, 30 Nov 2011 11:31:33 +0100, "Paul B. Andersen"
wrote:

On 28.11.2011 21:24, Henry Wilson DSc. wrote:
On Mon, 28 Nov 2011 11:16:55 -0800 (PST), Jerry
wrote:


Inserting context:
The odometer/speedometer readings are much less dependent
on the tire pressure than one would be inclined to think.
That's because modern tires usually are steel-belted
radial tires, where the circumference of the tire is very
stable and little dependent on the pressure.
So when the wheel has made one revolution, it will have
advanced one circumference.
"The peculiarity is that if r is the distance from the hub
to the ground, the wheel will advance more than 2 pi r
per revolution.
How is that possible?
The sides of the tire are flexing."

Ralph's response:
"Oh dear! I feel embarrassed reading this.
No wonder you are silly enough to believe
everything Einstein said."

Lethal argument defending his response follows.
Taa-daa:

There is no mention of a car....just a wheel.

You are of course right, Ralph.
Nobody has ever mentioned a car.
When you started the discussion about to what degree
the tire pressure affects the odometer readings by stating:

"I assumed the odometer reading is also 2% high...but
I could be wrong. It also depends on the tyre pressure."

.. you were obviously thinking of just a wheel with an odometer.

And we all know that for just a wheel with an odometer,
the odometer readings depend on the tire pressure.

So you were right:
The odometer reading depend on the tire pressure!
Right?

Well, after all, a barometer depends on the air pressure.