[DeTomaso] Rim Offsets

Wed Jul 3 15:20:46 EDT 2013

Interesting observations on the stock wheels, my experience as far as
comfort goes was the exact opposite.

I had never driven my car with anything other than the 245/40/17 and
335/35/17 that came on it when it was purchased until I decided
to enter it in the HHI Concours two years after I bought it.  I installed
the Campy's (7/8's) with the appropriate tires on it front and back and
took off
to drive to the event.

OMG, it was scary, I was not used to all that sidewall movement and wobbly
feeling in my car ( which is stiffened and lowered, etc )
and has considerably more power than stock.  I quickly dialed it back and
crept to the show and back, those things couldn't come off too soon.

To be fair, it had been years since I have driven on anything that wasn't
at least 60 series and far stiffer, I much prefer the solid, full, firm
footprint of a larger
contact patch on the Pantera.

Michael Shortt

On Wed, Jul 3, 2013 at 3:06 PM, B Hower <b.hower3400 at yahoo.com> wrote:

> Jack,
>
> Thanks for your 3/16" curl information ------- I can't wait to read the
> newsletter.
>
> FWIW -- Ford cars started the 5-on-4-1/2" bolt pattern in 1949. The center
> hole was larger than a '70 Torino but smaller a '72 Torino or '70 LTD.
>
> Bud #3400 ( Drive it like there is no tomorrow -- for there may not be ! )
>
> --- On Wed, 7/3/13, JDeRyke at aol.com <JDeRyke at aol.com> wrote:
>
>
> From: JDeRyke at aol.com <JDeRyke at aol.com>
> Subject: Re: [DeTomaso] Rim Offsets
> To: steve at snclocks.com, detomaso at poca.com
> Date: Wednesday, July 3, 2013, 3:06 AM
>
>
> The backspacing for a 7" Campy is 4.0", for an 8" Campy is 5.0" and for a
> 10" 2-slot Campy is 6.0". The 2-slot 10" wheel will NOT fit an uncut
> Pantera
> front fender but the others will. You will get some variation from other
> sources for a wheel's backspace if they lay a yardstick across a rim and
> forget
> to subtract the little 3/16" curl of the extreme outer reinforcing lip of
> the inner rim of a Campy (for instance), which should NOT be part of any
> backspace dimension. Not all wheels have this lip.
>
> If you're trying to locate a cheaper max-width rim that fits a Pantera
> using these numbers, that is an extremely complex subject. Remember the
> backspace measurement is only one of several vital dimensions you'll need.
> For
> instance, those backspace numbers above are all for wheels with 0.650"
> thick axle
> flanges. Thinner or thicker flanges will change the overall width of a
> wheel relative to clearing a fender edge or suspension parts. As the
> tire/wheel
> size goes up, the measurements for your particular car become more and more
> critical. Plus equally important to wheel width is the section width &
> tread
> width of the particular tire you're attempting to mount on them. There are
> NO off-the-shelf wide-wheel direct-bolt-ons that I know of; they all need
> rework of something to fit an uncut Pantera, and the wider they are, the
> more
> areas that interfere.
>
> Finally, a 5-on-4-1/2" bolt pattern is universal for 'small' Fords and some
> Mopars back thru about 1957, and is identical to wheels drilled for the
> 5-on-114.3mm used on Toyotas, some Hondas and other foreign made cars from
> Europe & the Far East with whom Ford has had dealings. "Big" Fords and some
> pickups used a 5-on-5" bolt pattern.
> Good luck- J Deryke (BTW, I have a 4-pg article coming out next month on
> this very subject in the POCA Newsletter)
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-- 

Michael L. Shortt
Savannah, Georgia
www.michaelshortt.com
michael at michaelshortt.com
912-232-9390

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