[DeTomaso] 265/50-15 tires

Tomas Gunnarsson guson at home.se
Thu Jul 26 16:20:41 EDT 2012


Michael,
 
If your concern is sidewall height, try mounting a 295/50 tire on the
13" rim. I measured my 295 tires at around 330 mm overall width on the
11" wheels I used to have. Handling won't be as crisp as with the
shorter tires but I think it'll look OK.
 
Tomas

<-----Ursprungligt Meddelande----->
From: michael frazier [red3644 at hotmail.com]
Sent: 26/7/2012 10:03:14 PM
To: garth_rodericks at yahoo.com; pantera list; jderyke at aol.com
Subject: Re: [DeTomaso] 265/50-15 tires

I talked to a B F Goodrich tech years ago about the Euro T/As and
specifically about the 305s we all use on the 10 inch Campys.
He talked about this extra ply on the Euro tires and that the 305s were
even more resilient...in other words, great tires far exceeding specs.
He mentioned a mark on the side wall indicating this but I don't recall
what it was and I don't have one in front of me to jog a week memory.
Wish those tires were still available for those running 10" Campys.

My problem is another tire availability issue....
I'm running 10" and 13" 10 spoke wheels on a flared car and will now use
asphalt sprint car slicks grooved to whatever tread pattern i want.
The 345 Yokos and Pirellis are to short for a GT4 car. The GT5 & 5S cars
have a different flare profile and look OK with them. 

Michael

> Jack,
> 
> Just curious, what's the point of your message? What are you trying to
tell us? I don't understand.
> 
> There is a HUGE difference between an 'S' rating and an 'H' rating.
The following are a few excerpts from an interesting thread with info
from a tire engineer for a major tire manufacturer:
> 
> All tire manufacturers utilize an "over-design / under-utilize"
methodology. It's been found that barely meeting the conditions - load 
> capability, speed capability, etc. - results in a certain rate of 
> failure in the real world. And while we can talk about under
inflation, 
> road hazards, etc., the reality is that over-specifying a tire results
> in reduced failure rates.
> 
> Pretty much every tire will pass an S rating. (Please note that I'm 
> limiting the discussion to regular passenger car tires. Winter tires 
> and light truck tires are a different story - similar, but 
> different.) And T ratings are not much of a stretch.
> 
> So an S rating would - on the surface - seem to be adequate for use in
the US where there are speed limits everywhere.
> 
> But,
> in order to pass an H speed rating, a tire more or less has to have a 
> cap ply. This change has a profound effect on failure rates, way
beyond
> what the increase in speed rating suggests. The failures rates are so 
> low for tires with cap plies that court room "experts" claim that tire
> manufacturers are negligent for not using cap plies even in their S 
> rated products. (My response to that is that these "experts" must also
> be saying that tires ought to have a minimum of an H speed rating -
and 
> if that is true, the "experts" ought to be lobbying NHTSA to specify H
> rated tires for any tire sold in the US.)
> 
> But the point I want to
> make is that the step between T and H is enormous from a tire 
> durability point of view. And I don't recommend anyone use anything 
> less than an H rated tire. Considering that the risk of a tire failure
> includes fatality, the cost / benefit seems to be there.
> 
> 
> A cap ply is an additional layer of a fabric and rubber composite that
is applied over the belts and oriented in more or less the
circumferential direction. What it does is restrict the growth of the
tire in the 
> circumferential direction - like centrifugal forces. But I also think 
> it adds bulk and reduces the standing wave, which may actually be more
> important in the context of tire failure.
> Source: http://www.eng-tips.com/viewthread.cfm?qid=159900
> 
> Additional info:
>
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CGcQ
FjAB&url=http%3A%2F%2Fwww.nhtsa.gov%2FDOT%2FNHTSA%2FVehicle%2520Safety%2
FTest%2520Procedures%2FAssociated%2520Files%2FTP-139-02.pdf&ei=5IkRULfdC
cfhrAfQjYGAAw&usg=AFQjCNEYEuipPu_2ACn67-1IsQDHUhGMHw&sig2=2c9ZNOZl-06muD
XE-nk4vQ
<http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CGc
QFjAB&url=http%3A%2F%2Fwww.nhtsa.gov%2FDOT%2FNHTSA%2FVehicle%2520Safety%
2FTest%2520Procedures%2FAssociated%2520Files%2FTP-139-02.pdf&ei=5IkRULfd
CcfhrAfQjYGAAw&usg=AFQjCNEYEuipPu_2ACn67-1IsQDHUhGMHw&sig2=2c9ZNOZl-06mu
DXE-nk4vQ> 
> 
> 
> 
> --- Original Message ---
> "S" speed rating = 112 mph max sustained (30 min. test)
> "H" speed rating = 130 mph max sustained (30 min test) That may mean
that's all the mfgr decided to ask they be tested to, or.... FWIW- J
DeRyke
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