[DeTomaso] Rim Offsets

B Hower b.hower3400 at yahoo.com
Wed Jul 3 15:06:55 EDT 2013


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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