[AT] truck tires; now pressures

Stephen Offiler soffiler at gmail.com
Thu May 15 11:34:53 PDT 2014


I don't know, Charlie... I think we can make a case that we are still
examining the tires on an F-600!

We've hit upon the importance of proper pressure, which is certainly true
on a hauling vehicle.

We've hit upon the use of temperature in relation to proper pressure, ditto.

Now you just hit on another interesting aspect of tires... they are
actually air springs.  When a tire/wheel is out of balance, it typically
shakes at a particular range of speeds.  That speed range is dictated by
the spring rate of the tire.  It implies that you can change tire pressure
(within safe limits of course) and observe the speed range shift.

SO



On Thu, May 15, 2014 at 2:02 PM, charlie hill <charliehill at embarqmail.com>wrote:

> Herb this is getting a bit away from the issue but NASCAR
> teams actually adjust tire pressure to increase or decrease
> the effective "spring rate" on a particular wheel to improve
> handling of the car.  That is something they can easily do during
> the race on a normal tire change.  By raising or lowering the
> tire pressure in one tire by as little as 1/2 PSI they can dramatically
> change the
> handling of the car.  However, that is in a situation where the price and
> durability of tires make little difference as long as the tire will make it
> for 50 or 150 miles until the next pit stop (depending on the track size
> and configuration)  they are happy.
>
> Charlie
>
> -----Original Message-----
> From: Herb Metz
> Sent: Thursday, May 15, 2014 12:59 PM
> To: Antique tractor email discussion group
> Subject: Re: [AT] truck tires; now pressures
>
>
> I don't follow the Indy 500 very closely, but, if memory serves, approx ten
> years ago the winner was determined by tire durability and their having a
> couple pounds less pressure on one tire?
>
>
> -----Original Message-----
> From: Stephen Offiler
> Sent: Thursday, May 15, 2014 11:57 AM
> To: Antique tractor email discussion group
> Subject: Re: [AT] OT truck tires/driveshaft?
>
> Firestone tires on that original Explorer (circa '91) has a max pressure
> rating of 35psi.  Firestone engineers recommended 28psi for the Explorer.
> Ford dropped that to 26psi to tailor ride and handling characteristics.
> Now add the fact that 99.9% of the driving population never checks their
> air pressures, and let a year or two go by, and natural diffusion thru the
> rubber has dropped the pressure to sub-20psi sort of levels.  Now we have
> created a situation that exacerbated the Firestone's propensity toward
> tread separation.  Lots of blame to spread all around in that whole thing.
> It also gifted the driving population with pressure sensors in each wheel
> in modern vehicles.
>
> SO
>
>
>
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