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2005-2009 Saleen Mustang For all S281, S302, H281 and H302 models based on the Ford S-197 Mustang platform, with the exception of the S302 PJ (see below). Be sure to specify year, model and equipment if asking for help.

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Old 03-06-2011
Aleks07-0518 Aleks07-0518 is offline
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Default Question: Widest rear tire for 20x9 wheel?

Well that time has come where I need new tires. Right now I'm rolling with the stock Dunlop tires. They are 275/35 20x9 all the way around. Well what I wanted to know if I can put 275/40 in the rear on a 20x9. What is the widest I can go on a 20x9 without any issues. Thanks in advance guys.
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Old 03-07-2011
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wiggywigton wiggywigton is offline
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275/35's are the widest that will fit. I just went through the same research and asked the same question.
the 40's should fit. The 40's just make the tires a little taller and you won't be able to rotate the tires. I wouldn't recommend it. If you have 20x9's all the way around, get some more life out of them by getting the same size and rotate every 3k miles.

I'm sooooo glad to get rid of the Dunlops. I just installed a set of Nitto's 555's on Friday and boy what a difference. The 555's were my second choice, NT05's was my first (but they were out of stock at the time I ordered).
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Mike Wigton
#06-409
MMR 1000S 302 Stroker, BBR Stage 2 cams 3.0 pulley 39# injectors, upgraded CAI, 20" Chrome w/275/35ZR's, 14 in Front Brakes, GT500 Heat Exchanger and Walbro Super Car dual fuel pumps, Rear bumper inlays, Shaftmaster 3.5 Alum Driveshaft, AEM Wideband A/F guage, Pypes Long tube headers X-pipe w/o Cats, Extreme chin spoiler, Steeda Tri-Ax short throw shifter, Hood Struts WMS stealth hood pins, Adj upper and lower rear control arms. tuned by Lito.
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Old 03-07-2011
Aleks07-0518 Aleks07-0518 is offline
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Ok thanks for makeing it clear Mike. Now I understand that I can go 275/40 in the the rear. The only reason I want to go with 40 is that it will fill in the gap a little. As far as for rotating the tires if I go 275/35 all the way around, I have to unmoumt the tires from the rims correct? Cuz it seems like the rear rims are offset a little more than the front.
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Old 03-07-2011
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wiggywigton wiggywigton is offline
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If the offset looks different then you might have the 20 x 10' s.
I have the 9's all around and I rotate. My wheels are all the same. Might want to double check your set.
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Mike Wigton
#06-409
MMR 1000S 302 Stroker, BBR Stage 2 cams 3.0 pulley 39# injectors, upgraded CAI, 20" Chrome w/275/35ZR's, 14 in Front Brakes, GT500 Heat Exchanger and Walbro Super Car dual fuel pumps, Rear bumper inlays, Shaftmaster 3.5 Alum Driveshaft, AEM Wideband A/F guage, Pypes Long tube headers X-pipe w/o Cats, Extreme chin spoiler, Steeda Tri-Ax short throw shifter, Hood Struts WMS stealth hood pins, Adj upper and lower rear control arms. tuned by Lito.
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Old 03-07-2011
Aleks07-0518 Aleks07-0518 is offline
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20x10??? Hmmm, well I the wheels are the Chrome, I've heard that you can tell if your rim is 10 or 9 by looking in the inside spoke. What I'm I looking for?
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Old 03-07-2011
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From the inside you will see cast in the wheel the rim width and diameter as well as offset. It will say 9x20 or 10x20. Put a tape measure through the wheel if you don't want to lay under the car and measure the width of both front and back. Or use a mirror and a flashlight.

since you have the Dunlops I suspect you have the 20x9's front and rear. The 20x9 and 20x10's (at least for 2007) are listed as optional with the Pirelli Rosso's and had 275/35ZR20 front and 275/40ZR20 rear, they were also assymetrico so they were not (stock) directional tires. I rotate mine side to side.

They 40 series tire definetly fills the wheel well better and as Mike W. said about, is the same width as what you have now.
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Old 03-07-2011
Aleks07-0518 Aleks07-0518 is offline
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Quote:
Originally Posted by Meikol02 View Post
From the inside you will see cast in the wheel the rim width and diameter as well as offset. It will say 9x20 or 10x20. Put a tape measure through the wheel if you don't want to lay under the car and measure the width of both front and back. Or use a mirror and a flashlight.

since you have the Dunlops I suspect you have the 20x9's front and rear. The 20x9 and 20x10's (at least for 2007) are listed as optional with the Pirelli Rosso's and had 275/35ZR20 front and 275/40ZR20 rear, they were also assymetrico so they were not (stock) directional tires. I rotate mine side to side.

They 40 series tire definetly fills the wheel well better and as Mike W. said about, is the same width as what you have now.
Hmmm interesting.. well one thing I do know is that when I look at the rear rims on the car the lug nuts sit deeper inside than the ones in the front. The lug nuts in the front are almost flush with the rim, while the ones in the back are deeper in. I will take a look and see what I find. Thanks guys very helpful.
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Old 03-07-2011
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I have seen lots of conflicting numbers on different offsets. I am sure Dave will straighten this out, but I believe there were a couple different combinations made depending on some variables.

I know the offset on the the Seven spoke Chrome wheels I have and WickedSC have are 45mm on the 10" rim. We looked at it yesterday morning or I wouldn't remember.

The front 9" wheel is supposed to be 25mm, although I so not remember what mine says I will have to verify that is correct for me.

Please post up what you find in your case.

Oh yeah, nice color!
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Old 03-08-2011
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Yea, good point on the dunlops. If you have the 275-35's all around chances are you have 20 9's.
The car would look like it was sitting lower in the rear if you had 10's. The 275-35 would stretch more on 10's.
I wouldn't go off of the lugs. They might have been replaced at one time. Best thing would be to take it to a tire shop and have then pull all the wheels and measure.

I wonder if 40's will fit on the the front? If you are looking to fill up the fenders a little more...
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Mike Wigton
#06-409
MMR 1000S 302 Stroker, BBR Stage 2 cams 3.0 pulley 39# injectors, upgraded CAI, 20" Chrome w/275/35ZR's, 14 in Front Brakes, GT500 Heat Exchanger and Walbro Super Car dual fuel pumps, Rear bumper inlays, Shaftmaster 3.5 Alum Driveshaft, AEM Wideband A/F guage, Pypes Long tube headers X-pipe w/o Cats, Extreme chin spoiler, Steeda Tri-Ax short throw shifter, Hood Struts WMS stealth hood pins, Adj upper and lower rear control arms. tuned by Lito.
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Old 03-08-2011
Aleks07-0518 Aleks07-0518 is offline
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Ok I looked at the rims and it looks like I have 20x9 all the way around. I did put a tape measure through the rim and from the rotor to the inside of the rim the rear rims measure 2 1/4 and the fronts measure 2in. When I look at my care it looks like it has the staggerd look and the rims in the rear look like if they were wider. I think I will go with 275/40 in at the rear and stock 273/35 up front.
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Old 03-08-2011
kcobra kcobra is offline
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If you look on the inside of the rears and see either 45mm or 50mm, those are 10 inch wides, the fronts should be either 25mm or 30mm I believe (9 inches wide). Saleen had different suppliers and they measured the wheels differently. I've got different on both sides of my car but they are the same rims. 9 in the front and 10 in the back. One side says, 25mm and 45mm and the other says 30mm and 50mm I believe. The previous owner replaced 2 rims. The inside of the lug nut area and the inner rim are argent. Must have been because of all the chrome peeling problems.

Quote:
Originally Posted by Meikol02 View Post
From the inside you will see cast in the wheel the rim width and diameter as well as offset. It will say 9x20 or 10x20. Put a tape measure through the wheel if you don't want to lay under the car and measure the width of both front and back. Or use a mirror and a flashlight.

since you have the Dunlops I suspect you have the 20x9's front and rear. The 20x9 and 20x10's (at least for 2007) are listed as optional with the Pirelli Rosso's and had 275/35ZR20 front and 275/40ZR20 rear, they were also assymetrico so they were not (stock) directional tires. I rotate mine side to side.

They 40 series tire definetly fills the wheel well better and as Mike W. said about, is the same width as what you have now.
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Old 03-17-2011
Aleks07-0518 Aleks07-0518 is offline
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well just a update, i decided to go with 275/35 all the way around. i went with Bf goodrich kdw all filled up with nitrogen. i can say im happy withe the tire ride,noise, and handalking are great. thanks guys
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