2 Dec
2015
2 Dec
'15
8:13 a.m.
Mathematically, circumference is PI times diameter or 3.14159..... times
the diameter.
On 12/2/2015 11:06 AM, Fred Cisin wrote:
On Wed, 2 Dec 2015, Paul Koning wrote:
Actually, it's the circumference that
matters, not the diameter.
I always thought that there was a relatively stable relationship
between those! :-)
Circumference tends to be a little over 3 times the diameter (3.0 in
some states) :-)
Does the circumference of a rubber roll change
significantly when you
press on it?
If it shifts or squeezes out to the sides, not so much.
If it compresses, yes.
Before TPMS, some cars got a crude estimation of low tire pressure by
comparing the RPM of a tire (ABS sensors) with its fully inflated
brethren.
(circumference changing with pressure change)