[DeTomaso] old tires

[hemipanter at hemipanter.se]

Did they broke in the middle?
Goran


> I had a set of Pirelli P7R's, in 345-35-15 flavor, split wide open on me
> in
> less than 30 miles.
>
> Brand new tires (un-used), with gorgeous treads and the little rubber
> nipple
> things but they split right down the middle. I repeat - they had 30 miles
> on
> them when they failed.
>
> They were also 12 years old. I was lucky and was going about 25mph when I
> heard a "BANG!!!!!!". I pulled over to see what the noise was and noticed
> the car sagging to one side.
>
> 15" tires are hard to find and can be expensive.
>
> Massive body work on your car, or extensive surgery on you because your
> tire
> blew out in the first curve can be even more expensive.
>
> After first-hand experience with a quality tire that blew out on me, I
> won't
> run old tires again, regardless of how nice and new the treads look...
>
> Charles McCall
> 1985 DeTomaso Pantera GT5-S #9375
> "Raising Pantera Awareness Across Europe"
> http://www.poca.com/index.php/gallery/?g2_itemId=2323
> -----Mensaje original-----
> De: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] En
> nombre de JDeRyke at aol.com
> Enviado el: domingo, 18 de abril de 2010 20:59
> Para: rtaspl at aol.com
> CC: DeTomaso at realbig.com
> Asunto: Re: [DeTomaso] old tires
>
> In a message dated 4/18/10 8:26:09 AM, michaelsavga at gmail.com writes:
>
>> So the BIG question to the group is - are the (9 yr old) tires safe to
>> run over 100mph or is it a heat/time thing?
>>
> Every case is different. I've run premium older tires well over100mph
> until
> cord shows. Others have had cheap near-new tires delaminate at 60 mph,
> causing body damage. Racing tires have no age-fighting chemicals in their
> compounds so they age faster. Its also where the tires spent most of their
> time.
> Ozone and sulfur gasses in the atmosphere attack rubber compounds and
> crack
> the sidewalls & treads, even inside garages. Time and high storage
> temperatures (or low inflation pressure that overheat the skins) also ages
> &
> drives
> out plasticizers from the rubber, making them harder and more prone to
> crack.
> Stored in downtown areas where there are many industrial pollutants
> floating
>
> around, tires might last a couple of years. A useful gauge is whether
> freshly-polished silverware turns black while you watch; the same
> pollutants
>
> cause silver-blackening.
> Stored indoors, in quiet pollution-free rural areas away from factories or
> electric motors which generate ozone, tires   can last a good decade or
> more. A pro inspection will tell you more- and this will not likely come
> from a
> highschool dropout at the gas station who sells on commission. I'd take
> the
> mounted tires to someone who distributes race tires; he's likely more
> knowlegable and more interested in keeping you alive so you'll come back
> again.
> Bottom line- its the same as a safety helmet; if you want to be perfectly
> safe, junk 'em every few years. If you're poor, get them pro-inspected
> before
> spending more time & hard-earned money. Pilotsports are getting scarce
> these days!
> My 2¢- J DeRyke (NOT a tire engineer, just a consumer. Use above at your
> own risk!)
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