Hi Mark,
I don't know whether anyone has answered your question yet, but the DOT number
on the sidewall determines when the tire was manufactured (date code).
Scott Helms
In a message dated Mon, 15 Oct 2001 2:53:02 PM Eastern Daylight Time,
"Creamer, Mark" <CreamerM@cintas.com> writes:
> How can I determine on a car purchased 1 1/2 years ago approx how old my
> tires are? They're redline Michelin X, and they "look" really new. I've
> been thinking about getting a set of everyday drive wheels and tires and
> hang the redlines up for shows only - maybe I should do so sooner rather
> than later
>
> Mark Creamer
>
> -----Original Message-----
> From: William Whitmoyer [mailto:wwhitmoyer@samsonite.net]
> Sent: Monday, October 15, 2001 2:26 PM
> To: 6pack@autox.team.net
> Subject: RE:Old Tires
>
> Tires build up heat as they turn, mostly from the flex of the contact
> patch
> when rotating, and also, separately, from heat generated by the brakes
> under braking. As the tire material degrades over time (and hardens
> too),
> it can not withstand the flex/brakes heat cycle as well and this
> compounds
> the decay...hence problems in the moment of crisis when you "load" up
> the
> tire's sidewalls. I get a shutter when I see obviously old tires with
> cracking, dry-rotted sidewalls mounted to classic cars...your safety
> margin
> is very small at that point. For TR6s, tubed-tires create even more
> internal heat than non-tube, as the tube rubs against the inner tire
> during
> the contact patch flex (and, in a nutshell, is why tubed performance
> radial
> tires were very short-lived in the marketplace) .
>
> I also understand that this is a big problem with RVs that sit for long
> periods of time...the tires degrade tremendously and blow out with very
> low
> actual driven miles.
>
>
>
> ----------cut----------------
> Date: Mon, 15 Oct 2001 09:05:32 +0100
> From: Will <tr6@mac.com>
> Subject: Re: Tires - Let's be safe!
> > The accident was blamed on the failure of his old tires.
> >Please, everyone, if you have old, original tires that you want to use
> for
> >show purposes, only use them for that purpose. Keep another set of
> tires
> >and wheels with modern tires for running at highway speeds or normal
> >driving. Me - I run on 2 year old 205/70x15s and keep an old tube-type
> >Michelin redline as my spare.
> >
> >Rex Townsend
> I'd like to second this one.
> Last year we set out across France on two new tyres, one almost new
> tyre & one 'old' tyre, which nonetheless had plenty of tread & no
> sign of damage. We reached the centre of France by Autoroute without
> incident, however the return journey began with a wooden palette
> lifting off a trailer I was following, and crashing into the road in
> front of me. The hard steering needed to avoid this must have
> weakened the old tyre: just minutes after joining the autoroute it
> burst, & the car ended up a write off.
> A new body & chassis later & its back on the road, but I won't be
> caught on old tyres again....
> - --
> William Davies
> 1975 TR6 PI
> CR6157-O
>
>
> William Whitmoyer
> 69 TR6
> 90 BMW iX
> 91 CRX Si
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