Made a BIG Mistake on my Rim Size - Mustang Evolution

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Old 01-02-2004, 12:46 AM   #1
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Made a BIG Mistake on my Rim Size

Sorry for posting that last thread. I though I was ordering 17X9 rims not 17X8. My wife was looking over my shoulder when I was looking at the updates to my last thread. Since she is the one who does all of our finances. She had the invoice to my rims. She then told me that I didn't order the 17X9's. I ordered the 17X8's. I was quit upset for a little bit. But once i calmed down. It was than, I felt so stupid for the last post I summited. I know I'm an idiut. So, back to my question. What would be the best size tire for my 17X8 rims? I'm sorry again guys for the mess up.
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Old 01-02-2004, 01:00 AM   #2
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255 45 17?

i think thats the right size.
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Old 01-02-2004, 01:05 AM   #3
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I thought it was 245 45 17; leastways that's what I got.
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Old 01-02-2004, 01:29 AM   #4
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All Mustangs with 17X8 rims come with 245 45 17 from the factory
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Old 01-02-2004, 02:31 AM   #5
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well you'll get less road noise now.
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Old 01-02-2004, 02:54 AM   #6
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:yes:
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Old 01-02-2004, 04:59 AM   #7
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But on the brighter side.
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Old 01-02-2004, 01:38 PM   #8
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245/45/17 is the largest RECOMMENDED size, I have 275/40s on the rear of my GT, this is however stretching things quite a bit, 255/45s or 40s would probably be better, with the 275s on 8" I have noticed the outter tread does tend to turn up some, therefore you don't get full advantage of the 11 inches of tread with the 8" rims, they would be much better on at least 9" rims. I plan to get 9" or maybe 10.5 inch wide rims for the rear later on.
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Old 01-02-2004, 06:32 PM   #9
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Ideally, the tire width should be within 1" of the rim width, so a 7 to 9" wide tire would work best on an 8" rim. Too wide and the center bows out and wears first. Too narrow and the edges wear first, if you can get the tire to seat even. Low profile tires are harder to seat and too narrow makes it worse.

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Old 01-02-2004, 07:01 PM   #10
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245s are 9", 275s are actually 11" so according to your formula they would even be too wide for a 9" rim, but that is what comes stock from Ford on the 03 Cobra on 9" rims.
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Old 01-03-2004, 02:23 AM   #11
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sorry rick not meaning to correct, just add...
245mm->24.5cm/2.54=9.65" and 275's are 10.8".
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Old 01-03-2004, 11:38 AM   #12
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Well, with all due respect to Ford's suspension engineers, I haven't been too impressed with the live axle setup on the non-IRS Mustang's. Or the front suspension either. Too many problems that could have been resolved easily and cheaply at the design stage rather than making those of us that like a handling car spend many dollars correcting them via the aftermarket or DIY fabricating.

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Old 01-03-2004, 04:56 PM   #13
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7-9" TREADWIDTH for an 8" wheel, not section width. Tires are listed in
section widths. a 245/45/17 kumho 712 has a tread width of 9.1", not 9.65".
245/45/17s for 17x8s, 275s for 17x9s. any wider is a waste of money.

Those 245/45/17 kumhos ask for a 7.5-9" wide wheel to fit on. Each manufacturer
is a little different.
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Old 01-03-2004, 04:57 PM   #14
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Quote:
Originally Posted by Ponycarman
Well, with all due respect to Ford's suspension engineers, I haven't been too impressed with the live axle setup on the non-IRS Mustang's. Or the front suspension either. Too many problems that could have been resolved easily and cheaply at the design stage rather than making those of us that like a handling car spend many dollars correcting them via the aftermarket or DIY fabricating.

Steve
You're driving on a 1978 fairmont platform. What do you expect? It's
a tried and true, easy to produce setup. They're finally changing it with the
05.
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Old 01-03-2004, 05:08 PM   #15
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ive had both 255 and 245/45/17 inch tires on my 17x8s. I dont really notice any difference
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Old 01-03-2004, 05:28 PM   #16
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Thats because its only one tire size difference, its not a lot of difference, try squeezing some 275s on there, you will notice, its really a bit too much tire on the 8" rim, it will go on there, but it is going to bow some, mine actually seem to bow near the outside of the tread. I have pictures, but its hard to see it in the pics.
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Old 01-03-2004, 05:33 PM   #17
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here it is.... these were made this afternoon...
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Old 01-03-2004, 05:37 PM   #18
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I know I had one from the rear, if I can find it....
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Old 01-03-2004, 05:44 PM   #19
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OK, look pretty good? Wanta take a peek under the hood? Ok sure....
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Rick Kilpatrick, AAS Automotive Systems Tech, Alamance Community College, Class of 99. 06 5 speed manual Mustang with Pony pkg : GT Mac Mufflers, true duals with one custom pipe. 2.5" system. GT bumper cover, all installed March 7&8 2006. AFE Stage 1 CAI, Motoblue Underdrive pulley, GT aluminum shifter knob, honeycomb rear blackout panel,and dash kit installed. Roush hood scoop and side window louvers installed. SS taillight trim has been installed, new alum. GT steering wheel installed.
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Old 01-03-2004, 06:13 PM   #20
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my brother put 245s on his 7.5" rims they look kinda funny
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Old 01-03-2004, 06:20 PM   #21
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This is one thats closer up right after I got them mounted, you might be able to see more what I am talking about. See there on the outside edge of the tire about like two inches from the edge on out its bowed, see what I mean? That is from the 8" rims.
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Old 01-03-2004, 06:22 PM   #22
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Yeah, I can see it there, near the edge, instead of the tire being flat like it should be its bowed, you see?
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Old 01-03-2004, 07:14 PM   #23
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245's on 17x8's:


275's:


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Old 01-04-2004, 03:34 AM   #24
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Quote:
Originally Posted by mikael
You're driving on a 1978 fairmont platform. What do you expect? It's
a tried and true, easy to produce setup. They're finally changing it with the
05.
Well, the only time the other car in my .sig ever handled like my Stang does is when a tire is flat or very low on air. And that is exactly what I thought was wrong with my stang the first time the assend got squirrelly. A simple panhard rod would do wonders for it.

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Holy crap he's right.
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Old 01-04-2004, 11:41 AM   #25
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Quote:
Originally Posted by Ponycarman
Quote:
Originally Posted by mikael
You're driving on a 1978 fairmont platform. What do you expect? It's
a tried and true, easy to produce setup. They're finally changing it with the
05.
Well, the only time the other car in my .sig ever handled like my Stang does is when a tire is flat or very low on air. And that is exactly what I thought was wrong with my stang the first time the assend got squirrelly. A simple panhard rod would do wonders for it.

Steve
Yup, and one of those changes in the 05 is to put a panhard bar in. I put
on in my mustang (custom built) and man that was great.
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Old 01-04-2004, 01:08 PM   #26
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That is a pretty expensive mod isn't it Mikael? Would it really be worth it on a GT? Especially on a nearly stock V6 car...
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Old 01-04-2004, 02:16 PM   #27
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That is a pretty expensive mod isn't it Mikael? Would it really be worth it on a GT? Especially on a nearly stock V6 car...
It's like 300 bucks or so. You really can't describe the difference. One
must just experience it. It turns it into an entirely different car. Anyone
who says otherwise hasn't driven a mustang before/after a PHB install.
People pay hundreds of dollars for custom dual exhaust setups to gain
5hp or even more for side exhaust just to look cool. Hundreds upon
hundreds for body kits and paint jobs. This is 300 or so from MM and
can be installed in an afternoon and you get a new car out of it.
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Old 01-04-2004, 02:50 PM   #28
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I am working on a much cheaper costing Panhard setup. $300 is way too much, imo. Half that price is my target price. I'm a cheap SOB.

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Holy crap he's right.
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Old 01-04-2004, 02:55 PM   #29
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I am working on a much cheaper costing Panhard setup. $300 is way too much, imo. Half that price is my target price. I'm a cheap SOB.

Steve
I made mine for like 60 bucks tops.

And back to tires... I had 255s on my 17x8s (not by choice) and even
they looked funny. 245s for 17x8s, 275s for 17x9s.
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Old 01-04-2004, 03:53 PM   #30
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Here is mine, Goodyear Aquatreds 3's P205/60R 15's U know you like them.. (sorry I had to put mine on here)


Yeah baby!
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Old 01-04-2004, 05:55 PM   #31
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Quote:
Originally Posted by mikael
I made mine for like 60 bucks tops.
My target is the "for sale" price, not the it cost me price. I actually have an idea for a new type of locator that works in two planes, similar to a watts linkage, but a simpler setup more akin to a panhard rod, but more effective than one. If I could afford a patent I'd go that route.

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Holy crap he's right.
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Old 01-06-2004, 02:24 AM   #32
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255/45's.......just right
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