On Thu, 28 Jun 2018 22:26:40 +0100, Tim Streater
wrote:

In article , Jeff
wrote:

"T i m" wrote in message
. ..

Bingo.

I was walking round the park with our daughter earlier and I gave her
the nutshell iTPMS overview and asked her how she thought it might
work ... how the circumference could become shorter for the iTPMS to
'sense' the increased RPM.

"As the tyre gets flatter it spreads more and that makes the
circumference shorter and so the revs higher?"

Not convinced and that summary makes no sense either. Why would
the tyre 'spread more' as it gets flatter and why would the circumference
get shorter even if it did

Well it does spread a bit, see Fig 5 on:

http://the-contact-patch.com/book/road/c2020-the-contact-patch

But the circumference can't get shorter except for a small amount,

Bwhahaha ... what's this, the penny staring to drop with Turnips
goblin as well!!

much
less than the "rolling radius" people like Huge and T r o l l.

I personally haven't stated any numbers so even more BS and lies from
the goblin.

Fig 5 shows what *actually* happens when the tire is deflated (although
fig 5 is about higher speed effects, supposedly). You will see it
showing the bulge on each side of the flat part.

That is where the
extra circumference goes,

Ding! They all get there in the end ... even goblins!

Cheers, T i m