Yes, some very interesting things.
Does anyone have any idea about:
The speed rating of passenger car tires includes time. I.E.: 103 MPH at 1750
Lb.
for 10 minutes. What parameters are used for racing tires?
How do tires age and what can be done to retard aging? (store in the dark,
nitrogen, coat with mouse milk ????)
Can an old tire look good (lots of tire dressing) but be structurally unsound
internally because of aging?
Is there a way (Attn.: drmayf) to calculate the effect of the aerodynamic
wedge
on a tire using roller bearing formulas/techniques ?
Opinion:
I think the owner should be solely responsible for insuring that the tires are
in good condition. The inspector can't tell if the tire has a boot in it or
has casing damage caused improper installation.
Bryan Savage (who wishes he was as good at answering as asking)
Dave Dahlgren wrote:
>
> Interesting things to think about here!
> My 2 cents worth from looking around the last 10 years tells me there are very
> few wings at B'ville that make that much down force. KT would have told you
> about how the car settles down during a run from down force, well i
>instrumented
> it this year and the car moved very little probably on the order of 1/8 inch.
> >From what I can see of the rules for the most part real wings are not
>allowed in
> most classes and a spoiler is for cleaning up air flow and is not a foil that
> can generate large amounts of down force. personally i think tire failures
>have
> more to do with the the weight of the car. Most tires that I am aware of all
> have both a load rating and a speed rating. I would also have to think that an
> overloaded tire will have less strength and therefore a lower speed rating
>than
> one that is not overloaded. I have looked through the rule book and did not
>find
> anywhere so far a place that discusses the load rating of a tire. Does anyone
> think that i could run a Goodyear land speed tire on a Ford Expedition or a
>GMC
> Yukon at 200 mph and be ok with handling? or that the tires would not be
> overloaded? yet i have heard all about 5000 lb doorslamers with tires like
>these
> on them. If you really want to get a handle on tires and failures you might
>want
> to ask some one how much the car weighs and if the tires are rated for that
> weight and speed that they are planing on running. If they have a 5000 lb car
> and small front tires and have 55% front weight you have a failure waiting to
> happen!! I would bet most are severely overloaded.
> The front runners have no load rating at all listed on Goodyears site and many
> of the land speed tires are rated for 1200 lbs others at 1700 lbs with one
> listed at 3000 lbs. I looked at M/T site and there was nothing listed about
>LSR
> tires there ...
> If you really want to put any tire issues behind yourself you have to have a
> tire from a company that will give the recommended load and speed rating and
> check cars for compliance as part of a safety inspection. If you look at this
> link http://www.goodyear.com/us/tires/racing/products/racect19.html
>
> You will see that all these tires are rated at 300 mph or less at the rated
>load
> or less load..
> So if you have a car that goes over 300 on these tires you have an issue to
> begin with and like i said the front runners don't even have a rated load or
> speed that I saw so what is safe for those?
> The other side of this that I would have to ask is the age of the tires. But
> maybe that is another issue How do cars with visible checking on the side
>walls
> even get through inspection? They are there and i have seen them many times!
> What is the speed load rating after 4 years with a side wall that is checked
>and
> how do you separate cosmetic damage from structural damage?
>
> Dave Dahlgren
> Who personally would not buy a tire without a load and a speed rating and
>would
> believe it!
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