[DeTomaso] Rim Offsets

[Tomas Gunnarsson]

The backspacing for 8" and 10" wheels are actually the same.
 
Tomas

<-----Ursprungligt Meddelande----->
From: JDeRyke at aol.com [JDeRyke at aol.com]
Sent: 3/7/2013 10:07:20 AM
To: steve at snclocks.com; detomaso at poca.com
Subject: Re: [DeTomaso] Rim Offsets

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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