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The Official TIRE SIZE THREAD

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Psquare75 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Psquare75 Quote  Post ReplyReply Direct Link To This Post Topic: The Official TIRE SIZE THREAD
    Posted: 21-April-2009 at 12:22PM
Please list the following for your car..

Year Make Model

Tire size
Wheel width and offset
Lowering amount, if any
Rubbing issues experienced, if any
Any other pertinent info you think might be of use to us (ex- I have air shocks in the back so nothing rubs, you get the idea)
Paul
77 XR7 460/C6/3.00:1 *SOLD*
78 XR7 523/C6/3.5:1
79 F100 460/TKO500/3.25:1
'I also have some left over potatoes-I understand you can generate electricity from them'- Foote500
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Psquare75 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Psquare75 Quote  Post ReplyReply Direct Link To This Post Posted: 21-April-2009 at 12:23PM
1978 Mercury Cougar
255 50 17 in front, 275 50 17 in rear
17 x 8 3.5" back spacing in front, 17 x 9 4.5" back spacing in rear
No lowering
So tight I cannot run a mud flap on the passenger fender. Rear fits with room to spare.

Paul
77 XR7 460/C6/3.00:1 *SOLD*
78 XR7 523/C6/3.5:1
79 F100 460/TKO500/3.25:1
'I also have some left over potatoes-I understand you can generate electricity from them'- Foote500
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Torinogts73c Quote  Post ReplyReply Direct Link To This Post Posted: 21-April-2009 at 2:49PM
245/60-15 with 15x7 Magnums 4.25 back space on the front 295/50-15's on the rear w/15x8 magnums 4.5 backspace. thinking about swapping to 15x10 's for the rear same size tire . 1.5 " lowered in front with 2001 Crown Vic interceptor springs Ford #D9AZ-5310-W  . Rides & handles great!

Edited by Torinogts73c - 21-April-2009 at 2:53PM
Gary 73 Gran Torino Sport 351CJ,SVT LIGHTNING,07 CHARGER R/T HEMI,97 Mustang GT Vert

"Never complain Never explain"
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1975MontegoMX Quote  Post ReplyReply Direct Link To This Post Posted: 22-April-2009 at 2:34AM
1975 Mercury Montego MX

15/60/245
15x7 (Don't Know Backspace)
Stock Height
No Rubbing
Im running Monroe-Matic Gas Shocks all around
1975 Mercury Montego MX /351 M/
1986 Ford Crown Victoria /302/"5.0"
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mcford Quote  Post ReplyReply Direct Link To This Post Posted: 22-April-2009 at 3:16AM
couple different cars.
72 sport - ran 275/60r15 on a 15x8 magnum 500 rear and 215/70r15 on a 15x7 magnum 500 front.  dont know the backspace.
 
72 Ranchero - 255/60r15 rear and 245/60r15 front on factory ford 15x7 magnum 500's.
 
72 gran torino 4dr - 235/70r15 rear on 15x8 street star and 215/65r15 front on 15x7 street star wheels.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JimW Quote  Post ReplyReply Direct Link To This Post Posted: 22-April-2009 at 3:58PM
1976 Gran Torino, stock 351M non A/C springs, stock replacement shocks, AL headed big block/C6/battery in trunk, no front bumper support
265/50/15 on 15x8 TT2 in front (3.5" backspace I think) one front fender real tight in the back.
275/60/15 on 15x8 TT2 in the rear (same backspace) tight to rear fender lips, needed some clearancing with the BFG DR's but the MT DR's clear fine.
 
Jim
1976 S&H Gran Torino

460/C6/4.33 13.05@105.6

545/C6/3.56 11.52@117.8

More to come!!!!

463rwhp/495rwtq

two tons of fun

see it and hear it at:

www.torinocobra.com

www.st
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GranTorinoMan Quote  Post ReplyReply Direct Link To This Post Posted: 23-April-2009 at 4:01AM
72 Ford Gran Torino Sport
 
Front Tire - P225/70R15
Rear Tire - P275/60R15
Rear Drag Tire - 28x14.5-15LT (Drag tire rubs, air shocks pumped up to clear)   
 
Front Rims -  15x8 - (3.75" Backspacing)
Rear Rims - 15x10 - (4" Backspacing)
Drag Rear Rims - 15x10 - (4" Backspacing)
 
Stock Springs
Rear axle housing slightly narrowed 1" each end.  
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MarkGubinski Quote  Post ReplyReply Direct Link To This Post Posted: 26-April-2009 at 5:13AM
Chris, 14.5 on a 10 wheel? And doesn't it also rub on the front part of the frame rail near where the lower arm mounts?
 
Drag Only 1972 GTSs
26x4.5 front
29x11 on 15x10 back on my car (514 cu.in.)
28x10 on 15x10 on my son's car (472 cu.in.)
72 Gran Torino Sport 514
10.33 @134 @3600lbs.
2 Time Milan Dragway Track Champion.
2012 IHRA Div. 5 No-Box Champion.
86 career wins.





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Post Options Post Options   Thanks (0) Thanks(0)   Quote picon3 Quote  Post ReplyReply Direct Link To This Post Posted: 28-April-2009 at 2:50AM
I went with Vintique's Magnum 500 15 x 8 wheel:
 
72 Ford Gran Torino Sport
 
Front Tire -P255/60/R15
Rear Tire - P275/60/R15
 
Front Rim -15x8 - (4.50" Backspacing)
Rear Rim - 15x8 - (4.50" Backspacing)-fills the rear wheel nicely.  No rubbing.
 
Center Bore Diameter 2.125 inch with press on caps.
 
 


Edited by picon3 - 28-April-2009 at 6:28AM
1972 GTS 351CJ-4V black/black
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rtgreen Quote  Post ReplyReply Direct Link To This Post Posted: 05-May-2009 at 4:19AM
This vendor is running a sale on Magnum 500's from 18x10 to 20x10 in Deep Dish styles. The 1994-2004 Mustang fitment will work on our cars. Enjoy!
 
 
72 Gran Torino Sport Q 4spd

1996 GT- H/C/I swap, SCT

1995 Bronco - 5.0 5spd.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1973 429 torino Quote  Post ReplyReply Direct Link To This Post Posted: 05-May-2009 at 12:48PM
1973 Gran Torino Sport
Front 15x7 Wheel Vintique Magnum 500 235/60r15
Rear 15x10 Wheel Vintique Magnum 500 295/50 r15
No rubbing, nice fit
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Eliteman76 Quote  Post ReplyReply Direct Link To This Post Posted: 12-May-2009 at 6:45AM
1972 Gran Torino Sport
16 x 7 Ford Crown Vic police steel rim {same thing as what rangers, explorers use 1998-2002}
Kumho 245/50/16 sport radial*
 
1973 Gran Torino Sport
16 x 7 Ford Crown Vic police steel rim
Goodyear Eagle 225/60/16 radial*
 
*Note- these tires are both too short of a side wall for my liking.
Andrew
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ranchero72 Quote  Post ReplyReply Direct Link To This Post Posted: 08-June-2009 at 3:55PM
1972 Ford Ranchero 500
14x7 OEM Magnum 500 wheels
Road Runner G 78-14 tires
'72 Ford Ranchero 500
-351C C4
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Eliteman76 Quote  Post ReplyReply Direct Link To This Post Posted: 15-June-2009 at 6:10AM
OK, question time:
What are the largest tires that will fit our cars out back, when plus-sizing?
I am looking for a 17" tire, but I want something in the range of a 275 series, around a 30" tall. I want to say there is a 275/60r17 on General's site in the grabber UHP series.
I also saw a 255 tire...but at 27" tall, too short for my taste for back tires.
 
I looked at the typical Mustang type 275/40r17, and forget it, I don't want a donut 25" tall tire. I need some sidewall!
 
 
Andrew
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Psquare75 Quote  Post ReplyReply Direct Link To This Post Posted: 19-June-2009 at 3:24AM
Andy, this is a 275 50 17 on a 17x9 rim.



Paul
77 XR7 460/C6/3.00:1 *SOLD*
78 XR7 523/C6/3.5:1
79 F100 460/TKO500/3.25:1
'I also have some left over potatoes-I understand you can generate electricity from them'- Foote500
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Eliteman76 Quote  Post ReplyReply Direct Link To This Post Posted: 19-June-2009 at 2:12PM
What's the overall hight on that tire? My concern with the 50 series, it may be too wide for the 8" rim width.

Andrew
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gpd294 Quote  Post ReplyReply Direct Link To This Post Posted: 21-June-2009 at 6:00AM

I am looking for original size white wall tires for my wagon. I have a 1975 Gran Torino Wagon. What would yall recommend?

P205 75 14's, P215 75 14's, or something else?
 
I'm not looking for a bigger wheel combo as I am wanting to keep my original Torino hub caps.
 
Thanks, Carlos
Carlos....1975 Gran Torino Squire Station Wagon restored to look like a 1973 Torino Station

Wagon my Dad bought new from McAnary Ford on June 6, 1973 in Gary,Indiana
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Eliteman76 Quote  Post ReplyReply Direct Link To This Post Posted: 22-June-2009 at 6:37AM
On a wagon, I would of thought by 1975 they would have been a 15" rim.
On that car, i would think the tire size should be around a 225/75 or a 235/75 series size tire.
205 and 215 seem entirely too small for the weight of a Wagon, let alone a 4 door or coupe.
You can still run a bit of a tire on a 14" rim, but the sizes are getting increasingly a pain to find.
I forget, but I would image a 225/60 will fit a 7" wide rim?
Or, at the wheels you have a 14x6?
 
Andrew
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gpd294 Quote  Post ReplyReply Direct Link To This Post Posted: 22-June-2009 at 6:57AM
According to Coker Tires website it states the 1975 Wagon had size HR78-14 tires. Isn't this a bias ply tire??? Can someone tell me what this translates to when it comes to radial tires???
 
VEHICLE: 1975  FORD  Torino

Standard
HR78-14    JR78-14   
Wagon
HR78-14    HR78-14   


Edited by gpd294 - 01-July-2009 at 3:50AM
Carlos....1975 Gran Torino Squire Station Wagon restored to look like a 1973 Torino Station

Wagon my Dad bought new from McAnary Ford on June 6, 1973 in Gary,Indiana
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Eliteman76 Quote  Post ReplyReply Direct Link To This Post Posted: 23-June-2009 at 5:49AM
This was something I found poking around the net with Google...I think this would apply well with our Heavy Torinos.
From what I gather, you should stick at least a 225/75/R14 tire on your car.
If I was you, I would upgrade to Ford 15"x7" steel wheels, and go to a 235/75/r15 for a larger stock Torino sized tire that a lot of cars had. Every Elite I have owned were factory 15" wheel cars.
The Gran Torino Sports I have owned have all had 14x8 wheels, I have some 14x8 factory steel rims That I have held onto a few as spares with original bias Goodyear or Firestone tires because I like the look of the old tires.
 
Remember, you have a wagon. That car has some serious heft to it.
If you want to stick a whitewall on there, stick with a good brand...you are going to spend twice for white walls versus a blackwall or raised white letter, judging by the Coker Classic line of wide white walls, but BFG would be another good choice.
I figure you will have $900 for 4 tires, $1,125 for 4 plus the spare, and that's not including the shipping.
I would tell you to check out a local you-pull it for a 80's crown vic, those wheels should still accept the Torino center cap if the rim's center has the bumps for retaining the cap.
 
If you wanted to get fancy, I have a set of the Elite specific slotted stainless steel hubcaps, but you would need a 15" rim.
  
 
This bit came off here:
 

The first number is the width of the tire in millimeters, measured from sidewall to sidewall. To convert to inches, divide by 25.4 In the example above, the width is 185mm or 7.28".

The second number is the aspect ratio. This is a ratio of sidewall height (also referred to as "section height" in the diagram) to width. In the example above, the tire is 7.28" wide, multiply that by the aspect ratio to find the height of one sidewall. In this case, 185x0.60=111mm or 7.28"x0.60=4.36".

The last number is the diameter of the wheel in inches.

To figure the outside diameter of a tire, take the sidewall height and multiply by 2, (remember that the diameter is made up of 2 sidewalls, the one above the wheel, and the one below the wheel) and add the diameter of the wheel to get your answer.

Example...185/60R14 85H or 185/60HR14

185mm x .60=111mm x 2=222mm + 355.6mm(14")= 577.6mm or 22.74"


Tips from Dick on How To Calculate Your Tire Size:

Here is how you figure out the dimensions on a tire and what will work for your car. The first number is the width in Millimeters "255" is 255 mm, or about 10". I don't know what year your car is, but chances are these tires will be at least 1" and maybe almost 2" wider. You'll have to look to see if you have clearance, between the fender skirt and the rear wheel, and between the frame and the inside of the front tire in a sharp turn. Remember when you hit a bump in a turn, the tire will move a little closer to the frame.

The second number is the percentage relation between the height from the rim to the road as compared to the width. "70" means the tire is 70% as high as it is wide, or 7 inches from rim to tread (with no load on the tire). This will be a short, fat looking tire for your car, when the original was a tall thin dude. Some like this new look, some don't. You pick it.


Tips from Chris on Tire Measurement:

The measurement of the sidewall height on tires is always done as a function (or percentage) of the section width, and it's called the "aspect ratio."

In the 1950s and early 1960s, the standard aspect ratio was 82-84%, meaning the distance from the top edge of the rim to the top of the tire tread was that percentage of the width of the tire (which is measured about mid-carcass, not at the tread). Tire sizes were usually given as simply the section width and rim size, like 9.15-15 (9.15 inches wide, 15-inch rim).

Around 1970, bias-ply tires moved to a 78% aspect ratio, this the term "H78-15. H was a load rating, 78 was the aspect ratio, 15 the rim size. All tires using the same load rating (for example, G70-15, G60-15, etc.) were the same diameter. Because the diameter was the same and the aspect ratio was lower, a 60-series tire was wider than a 78-series.

As radials became the norm, these designations stayed in use, but an R (for radial, of course) was added: HR78-15. In the 1970s, US tire manufacturers adopted the European system of metric sizing (though the rim diameter is still in inches). Example: 235/75R15. R still stands for Radial, 235mm is the section width, 75 the aspect ratio, 15 the rim diameter. What's different in this system is that the section width is an absolute number, so a 235/75 is just as wide as a 235/60. The 60-series tire is therefore smaller in diameter.

During this time period, the "standard" aspect ratio dropped to 75% (today, 65%, 60% and even down to 35% on some exotic sports cars, are all common).

So, if you wanted to put a set of radial tires on an old car and approximate the original sidewall height, you'd have to go with an enormously wide tire, which is undesirable for many reasons, including more difficult steering and some odd handling response (for these cars, which were not designed to have such a big contact patch between rubber and road).

As such, we compromise with a balance of width and height that comes closest overall... an old 9.15-15 might become a slightly wider but shorter HR78-15, which then becomes an even shorter 235/75R15.

Finding correct-size 14-inch tires today is harder still, because few tire manufacturers make little 14's strong enough and wide enough to manage the load of a 5,000-lb car. Choose carefully, note the load rating (remember, some 65% of your car's weight is on the front wheels) and the temperature grade (B is OK, A is better, C is not good enough), and maintain proper tire pressure (about 4 lbs below max is what I use). We've all seen what happens when under-inflated tires overheat in a heavy vehicle like, oh, I dunno... a Ford Explorer?

 
Andrew
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