Originally Posted by
Phantoj
For what it's worth (???) I believe some auto tire pressure monitors work by measuring wheel rotational speed -- an under-inflated tire can be found because it will be spinning a little faster than the others.
I'm still a little cloudy on the mechanics of why this all works.
They used to before they were regulated by the (US) government. They're not accurate or quick enough to pass the standards.
Basically, the actual circumference is the over all wheel and tire combined. The effective circumference, what will be measured, is that of the deformed tire under your weight.
Really? five pages?
