[DeTomaso] FW: Tire pressure

[Charles Engles]

-----Original Message-----
From: Charles Engles [mailto:cengles at cox.net] 
Sent: Saturday, March 26, 2011 7:33 PM

Subject: RE: [DeTomaso] Tire pressure

Dear Forum,


         My experience with two Panteras over more than twenty years.

         The front tires wear almost forever.  The rear tires not so much.

         Ten inch rims (15x 10) and Pirelli P7s:  very quickly worn in the
center patch of the rear tires.  Painfully fast wear despite low, medium and
high pressures.
 
          Ten inch rims (15x10) and BFG Comp T/As (305-50-15):  Less rapid
center wear, but still wore in the center rear tire area.

         Seventeen inch diameter wheels (17x11) and BFG G-Force KDs:  Very
little wear with typical pressures of 35-36 psi, which is what I usually
used in the other tires.  It took *years* and thousands of miles to wear out
the KDs.

        Seventeen inch diameter wheels  (17x11) and Sumitomo HTZ:  Slightly
less rapid wear than Comp T/As and way faster wear than G-Force KDs.

       In my experience, the center wear of wide rear Pantera tires is due
to tire construction  more than inflation pressures.  The G-Force KDs, I am
told, have a much more rigid carcass and side walls.  I suspect that the
more "civilian" tires--P7s, Comp T/As and HTZs--- have less rigid
construction and permit a centrifugal outward bowing of the center of the
tire at speed when used on our favorite wide wheel rims.   That fits with my
observations over multiple wheel and tire iterations over two decades.
FWIW.


                     Warmest regards,  Chuck Engles

        


-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of boyd casey
Sent: Saturday, March 26, 2011 6:24 PM
To: Dave Londry
Cc: mikeldrew at aol.com; De Tomaso List; pantdino at aol.com
Subject: Re: [DeTomaso] Tire pressure

I am running Nitto NT05's235/40/18 9" width on the rim the manufacturer
calls for a maximum pressure of 50   psi
and 335/30/19 on the rear with 12.5" width on the rim. I run both front and
rear at around 40 psi although during pot holes season ( the spring) I tend
to run closer to 35 psi. I have not experienced any problems.
Boyd

On Sat, Mar 26, 2011 at 5:35 PM, Dave Londry <davel at emspace.com> wrote:

> Yes - I think a 335 carcass  on 11" and on 12" rims would behave quite a
> bit differently.
> dave
>
> On 3/26/2011 8:23 AM, Julian Kift wrote:
> > I have to disgaree to part of that statement; 35 psi is the pressure
'per
> square inch' so is independent of tire size. The issue is more likely that
> the tire is too wide for the rim size creating bowing in the tread center
at
> 35 psi which is now being compensated for by reduced pressure, two
different
> scenarios IMO.
> >
> > Julian
> >
> >> From: MikeLDrew at aol.com
> >> Date: Sat, 26 Mar 2011 01:59:50 -0400
> >> To: michaelsavga at gmail.com; pantdino at aol.com
> >> CC: detomaso at realbig.com
> >> Subject: Re: [DeTomaso] Tire pressure
> >>
> >>
> >> In a message dated 3/22/11 19 32 49, michaelsavga at gmail.com writes:
> >>
> >>
> >>> for some reason, my rears seem to wear out prematurely anyway.   I
keep
> >>> 335/35/17&  245/40/17. at 35 psi (cold).  Now that i have Kimbo, i
> hoping
> >>> for half the tread life and twice the fun.
> >>>
> >> They probably wear out prematurely in the center, no? 35 psi cold is
way
> >> high for tires that big, in the rear anyway.
> >>
> >> Lori was running 32 psi in hers, and she developed premature wear in
the
> >> center on the rears. She recently dropped the rears to 28, but only has
> a
> >> few miles on them since then.
> >>
> >> Mike
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