[Shotimes] Tire/rim width
Ron Porter
ronporter@prodigy.net
Fri, 8 Aug 2003 18:12:05 -0400
I think it has more to do with the angle of the installed rear struts, as
they slant away from the tire the farther up you go, and a 17" rim moves the
wide cross-section of the tire "higher" with relation to the strut.
Folks, does this sound like the gist of those threads? I wasn't really
interested, as I didn't plan on aftermarket wheels when the thread was
active.
Ron Porter
-----Original Message-----
From: Carl Prochilo [mailto:gr8sho@prochilo.myserver.org]
Sent: Friday, August 08, 2003 5:44 PM
To: Ron Porter; Shotimes@autox.team.net
Subject: Re: [Shotimes] Tire/rim width
That's interesting. I would have thought that the overall proportions of
the tire/wheel package would be maintained assuming that tire width and
overall diameter remained constant. My son's 95 is running 235/45s on 17x7
inch wheels with absolutely no problems whatsoever. I would then surmise
that a 16x7 (or x8) inch wheel should be able to handle a 235/50 series
tire. This assumes a proper offset.
Maybe the issue turns out to be that the taller the sidewall, the more give
it has under hard cornering resulting in the interference. Then, dialing
out some negative camber induced by the shorter Eibach springs should give
you more room for the tire. I believe the Eibachs nominally cause -1.0 in
the rear's.
Carl
----- Original Message -----
From: Ron <mailto:ronporter@prodigy.net> Porter
To: 'Carl Prochilo' <mailto:gr8sho@prochilo.myserver.org> ;
Shotimes@autox.team.net
Sent: Friday, August 08, 2003 5:18 PM
Subject: RE: [Shotimes] Tire/rim width
IIRC, there was a long thread about tire sizes and wheel offsets about a
year ago. I think I remember that 17" wheels have less of an issue with the
tire hitting the rear strut housing, as the tire sidewall is farther away
than it is with a 16" wheel.....or something like that!! Anyone recall this?
Ron Porter
-----Original Message-----
From: shotimes-admin@autox.team.net [mailto:shotimes-admin@autox.team.net]
On Behalf Of Carl Prochilo
Sent: Friday, August 08, 2003 4:10 PM
To: Shotimes@autox.team.net
Subject: Re: [Shotimes] Tire/rim width
This is slightly off the thread, but TR's database will also take into
account
the type of car when they apply the fitment guide. It seems that Gen 1 and
Gen 2 SHOs are lumped together. So, if you say you want a 16" wheel and go
to
tire selection, they only offer the 215/60 size. They say this is due to
fitment problems customers have reported to them in the past. But if you
ask
for a 17" wheel they give the 225 width choice. Go figure.
----- Original Message -----
From: Ron Porter
To: 'Leigh Smith'
Cc: Shotimes@autox.team.net
Sent: Friday, August 08, 2003 3:49 PM
Subject: RE: [Shotimes] Tire/rim width
The best source for the tire dimensions, recommended rim widths, and the
spec rim size are on Tire Rack's site for virtually every tire they sell.
Just look under Specs for a given tire.
Ron Porter
-----Original Message-----
From: shotimes-admin@autox.team.net [mailto:shotimes-admin@autox.team.net]
On Behalf Of Leigh Smith
Sent: Friday, August 08, 2003 2:56 PM
To: dean james
Cc: Shotimes@autox.team.net
Subject: Re: [Shotimes] Tire/rim width
The old thumb rules still hold up pretty well. However there are
specific manufacturer's recommendations for suggested rim width, for
each size tire. BFG and Goodyear both do a great job at this and have
tire info posted on their websites.
There is another major issue with wide tires on the SHO, wide wheels.
True a 8 inch wheel would support an 8 in tire ideally. But the tire
sidewall dimension grows as well. That "thumb rule" is "add 0.5 in. to
sidewall width for every 1.0 in added to wheel width". This means you
need to know the "spec rim size" that the mfgr uses to come up with his
sidewall dimension. It's in the flyers. A 8 in wheel may make the
sidewall dimension grow as much as 1 inch.
IIRC, and the reason I bring all this up, is that the major limiting
factor on tire width on a SHO is sidewall clearance. Mine is 1/2 in.
(Max) away from the swaybar link "BOLT". with stock size tire/slicers.
IIRC someone had a stock size tire blow-out at high speed on the race
track during an earlier Atlanta convention due to rubbing this bolt and
tearing out the sidewall. There can be a lot of sidewall movement under
high loads with tall 60 series sidewalls.
Ian F. has 8 in wheels and 225/55 tires (or /45), but I believe his
offset is not stock, it is outside a little bit. He has the same bolt
clearance as stock, but the tire sticks out the fender lip 1/4 in. If he
were to go to a stock offset to tuck the tire in, he'd tear the sidewall.
My 0.02 advice, deal with the real threat and sawzall off half the d***
sway bar link bolt. There is at least another 1/4 - 3/8 in or so til the
tire rubs the smoother strut. Go with 7-1/2 to 8 wide, and tuck them way
in with the right rim offset.
Lee
"I put 10 in wide wheels inside the stock fenders on a 70 Z28 when
everyone said it couldn't be done"
dean james wrote:
> I had to go out to the parking lot in 100+ degree heat and take some
> measurements. (109 degrees yesterday!) Both sets of my Yoko 225's
> have a tread width of about 7 5/8" which would be 194mm. So these
> tires are right at the limit of tread width 1" larger than rim width,
> and an 8" wide rim should be good.
>
>> Equate terms like "the old rule" to "old wives tales".
>>
>> If in doubt, go to the Tire Rack Spec site for the particular tire
>> and size
>> that you are looking at. That will tell you what the mfr feels is the
>> best
>> setup.
>
>
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