[DeTomaso] Tire Failures (Re: How tough are the 15" factory magnesiumwheels?-UPDATE-"I'm no Mad Dawg")

Sat Jan 10 12:22:46 EST 2009

These have been excellent examples of WHY the tire inspectors at Open 
Road Races will NOT accept tires with older date codes.  They have these 
rules for a reason, for a SAFETY reason.  Date Code, Speed Rating, Tread 
Limits, etc.  They all contribute to the life of a tire.  The last thing 
we need is some Doug Mann not paying attention to his tires and ending 
up upside down after shearing a phone pole from leaving the road.

Be safe out there, check your tires.  It's the only thing between you 
and the road.

Asa Jay

Asa Jay Laughton, MSgt, USAFR, Retired

& Shelley Marie
Spokane, WA

1971 Mach I Mustang  [ASA JAY]
1973 Pantera L 5533  [ASASCAT]

******************************     
http://www.asajay.com
http://www.351c.info

Charles McCall wrote:
> I'll second the "the tire store did you no favors" opinion, and again based
> on personal experience and not second-hand stories... 
>
> My GT5-S came with a spare set of unused rear Pirelli P7R's. When the time
> came, I mounted them up. They lasted exactly 40 kilometers before I heard a
> loud "BANG!". The noise was loud enough to scare me into pulling over to
> investigate, and I watched the last of the air run of out my tire. 
>
> It had split lengthwise right between the tread, probably four inches long.
> Fortunately I was only tiptoing along at probably 20mph when it happened. We
> can speculate about what could have happened had I been "at speed" or in
> curves. 
>
> Post mortum inspection - there was no cracking visible in the tire, with the
> exception of the one huge crack that was fatal. The tire was 11 years old.
> The tire looked brand new - the little nipple thingies hadn't even begun to
> wear off yet. It killed me to throw away two tires that "looked" so new, but
> away they went. 
>
> Sometimes tire stores have silly rules to cover their a**es but this is one
> case where I think there is a legitimate safety issue. Thank about what life
> would be like if your tire split on you while accelerating on a highway
> cloverleaf... or on a 2-lane road with an oncoming truck.. 
>
> -----Mensaje original-----
> De: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] En
> nombre de Kerry Maguire
> Enviado el: jueves, 08 de enero de 2009 23:12
> Para: JDeRyke at aol.com; detomaso at realbig.com
> Asunto: Re: [DeTomaso] How tough are the 15" factory
> magnesiumwheels?-UPDATE-"I'm no Mad Dawg"
>
> I took my wheel and tire to Discount Tire this morning and they declined to
> repair the tire because it was more then 10 years old. I am running 8's and
> 10's on the factory magnesium 15" wheels.
>  
> As you all know, 305/50-15" tires are made out of "unobtainium". 
>  
> I was sent by Discount Tire to a "Hispanic owned" tire store that wouldn't
> ask too many questions and would plug my tire. Even though my Cat #5606 is
> driven enough to keep the tires in good shape, Discount tire was concerned
> that if the tire was dismounted, that the bead would fail. So, I had my tire
> plugged at the "Hispanic Tire Store".
>  
> I do not drive fast and competitively like Mad Dawg. 
>  
> I have plenty of tread left on my 1995 era BF Goodrich tires, so I am going
> to make them last a little while longer and drive them with one tire "the
> plug" in it.
>  
> The good news is that a couple of months ago, I was able to source 4-Toyo
> Proxies ST in the 295/50-50" size for the rear wheels. In the next year or
> two, I will broom the BF Goodrich tires and have the new set of the Toyo's
> mounted front and rear.
>  
> My apologies to all of the performance driver's out there, but I want to
> make the BF Goodrich's last as long as possible. 
>  
> I really like the appearance of the factory 8's and 10's and do not want to
> purchase an updated set of wheels and tires at this time.
>  
> Regards,
>  
> Kerry M. Maguire
>
> ________________________________
>
> From: JDeRyke at aol.com [mailto:JDeRyke at aol.com]
> Sent: Thu 1/8/2009 12:08 PM
> To: Kerry Maguire; detomaso at realbig.com
> Subject: Re: [DeTomaso] How tough are the 15" factory magnesium wheels?
>
>
> In a message dated 1/7/09 5:35:55 PM, kmaguire at landrovermiramar.com writes:
> snip.....
>
>
> 	I am going to a Discount tire store recommended by an officer of the
> San Diego Pantera Club. Also, the wheel weights are mounted on the lip of
> the rim. Is this the common wheel weight mounting
> 	method used on these wheels?
> 	
>
>
> Absolutely not! The weights always vibrate a little, chip the protective
> paint and then water gets in and dissolves the magnesium! ALWAYS use glue on
> weights placed on the horizontal backside of the wheel, with a couple of
> protective strips of duct tape over them.
> Second problem: be very sure the tire people know that this is a 35-year-old
> MAGNESIUM wheel before they use their automatic tire-machine on it. Wheels
> have been chipped and broken in two by these machines. When I'm forced to
> take a wheel to such places, they often elect to do the disassembly (and
> reassembly) by hand once they know what they're dealing with! 
> To answer the question in the post heading, Campagnolos are pretty tough but
> are quite thin (only 3/16" thick in spots), and as time goes on, mag gets
> harder and more brittle. Its best if such wheels are annealed in an oven
> every decade or two to remove this brittleness. Good luck- J DeRyke
>
>
>
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