Barbara and/or Bill Hooper wrote:
>
> on 4/27/2002 2:04 PM, James Frysinger at [EMAIL PROTECTED] wrote:
>
> > What on Earth would require such large pressures? Tires for semi-trailers and
> > their tractors?
>
> Larger tires can be made to use LESS pressure. It is SMALL tires that
> require higher pressure. The highest air pressure I ever had to use on a
> tire was on the little tire on my wheel barrow.
What you say is true when comparing vehicles that load the same number
of tires by the same amount. But semi-trailers carry much more than my
Dodge Caravan does. Even when correcting for the number of tires, I bet
I still lose the load contest. Don't forget that the footprint (width
times a factor for the tire diameter) has a bearing on this matter, too.
Jim
--
Metric Methods(SM) "Don't be late to metricate!"
James R. Frysinger, CAMS http://www.metricmethods.com/
10 Captiva Row e-mail: [EMAIL PROTECTED]
Charleston, SC 29407 phone/FAX: 843.225.6789
