Biggest tires for stock 18" 07 GT mustang
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Old September 5th, 2013, 05:17 PM   #1
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Biggest tires for stock 18" 07 GT mustang


I searched but did not find.
I have a stock 07 GT mustang with 18" stock wheels.

What is the biggest tires ( both high & wide) that I can run with out rubbing?

Any one have any suggestions?
Where / what to buy?

Thank you for all information.
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Old September 5th, 2013, 05:31 PM   #2
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I'm kinda interested about this to, wanna get some 18's soon and big tired are sexy
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Old September 5th, 2013, 05:33 PM   #3
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If you get a tire that fits the stock rims you will never have a rubbing issue. I think 235/50's come on the stock 18's. I wouldn't go wider than 255 if you are getting a 40, 45 or 50 series profile. I wouldn't do 255's with a side wall shorter than that.
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Old September 5th, 2013, 05:55 PM   #4
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I've squeezed a 275 on my stock wheels with zero issues, height wise I'm about to go with a 29" tire but there's still room to play, I reference this chart for side profile to inch conversions
Tire Height Chart
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Old September 5th, 2013, 06:07 PM   #5
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does the width go the same for 17 wheels? I can squeeze a 275 on? Cuz I have my stock wheels and I want some drag radials but I don't wanna DD on them, I just want them for track days
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Old September 5th, 2013, 06:38 PM   #6
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You guys all need to know why going too big is not going to give you any more performance and actually prevents the tire from performing the way it should. Too big of a tire can adversely effect tire wear and performance. Sure lots of people do it and are unaware of the of the issues because they either just are not that good of a driver (meaning really in tune with their car) or don't push it to a point where the effects are evident. But if you take the same size tire and put it on a proper size rim you will have a car that accelerates, corners, and stops better. Please read post #30 in this thread. I just don't want to type it all out and this guy pretty much nails it on the head.

315 Nitto NT05R's mounted on stock 9" wheels *pics inside* - Page 2 - SVTPerformance

I would like to think that us MMers are smarter than the rest of the folks out there. If you wanna run a big tire, please by a big rim. We make fun of the import guys when they do stupid shit. This falls right into that same boat. It looks stupid and is stupid if you think you're gonna get better performance by going too big. I think we might even refer to it being rice. Do it right please.
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Old September 5th, 2013, 07:17 PM   #7
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I got 285/40/18's on the back of my '06

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Old September 5th, 2013, 08:08 PM   #8
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And I have 305/45/18's on the back of my 07.
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Old September 5th, 2013, 08:17 PM   #9
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Originally Posted by 07 Boss View Post
You guys all need to know why going too big is not going to give you any more performance and actually prevents the tire from performing the way it should. Too big of a tire can adversely effect tire wear and performance. Sure lots of people do it and are unaware of the of the issues because they either just are not that good of a driver (meaning really in tune with their car) or don't push it to a point where the effects are evident. But if you take the same size tire and put it on a proper size rim you will have a car that accelerates, corners, and stops better. Please read post #30 in this thread. I just don't want to type it all out and this guy pretty much nails it on the head.

315 Nitto NT05R's mounted on stock 9" wheels *pics inside* - Page 2 - SVTPerformance

I would like to think that us MMers are smarter than the rest of the folks out there. If you wanna run a big tire, please by a big rim. We make fun of the import guys when they do stupid shit. This falls right into that same boat. It looks stupid and is stupid if you think you're gonna get better performance by going too big. I think we might even refer to it being rice. Do it right please.
So if I wanted the widest DR i could fit on a stock 17 rim what would that be? it would be a track only setup.
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Old September 5th, 2013, 08:20 PM   #10
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I know they made a 18"X8" and a 18"X8.5" wheel so check to see which you have,,, also if you go to Tirerack site you can check each tires manufactures spec's on each tire.. This puzzled me as I thought (lets say) a 255x45x18 tire no matter who makes it is the same! But under the spec's of the tire you will see recommended wheel width. some may say 8" to 9" and others will be smaller???? so as an example (Just to say) a goodyear 245X50X18 has a recommended rim of 8 to 8.5" but a firestone 265X45X18 will have a recommended 8" to 9" rim!!!! I am not sure why???? but in reality,,I want to go with continentals ,, the biggest tire I can get in a continental is 255X45X18 but I could get a 265 or bigger from other companies!!!
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Old September 5th, 2013, 08:24 PM   #11
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I fit 12.5 tires on 8-9 rims all day on Jeeps that was to keep the wheel tucked in though
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Old September 5th, 2013, 08:33 PM   #12
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Originally Posted by mamonti View Post
I know they made a 18"X8" and a 18"X8.5" wheel so check to see which you have,,, also if you go to Tirerack site you can check each tires manufactures spec's on each tire.. This puzzled me as I thought (lets say) a 255x45x18 tire no matter who makes it is the same! Buy under the spec's of the tire you will see recommended wheel width. some may say 8" to 9" and others will be smaller???? so as an example (Just to say) a goodyear 245X50X18 has a recommended rim of 8 to 8.5" but a firestone 265X45X18 will have a recommended 8" to 9" rim!!!! I am not sure why???? but in reality,,I want to go with continentals ,, the biggest tire I can get in a continental is 255X45X18 but I could get a 265 or bigger from other companies!!!
There are some variances from one company to the other as far as what they call a 255 or whatever tire size you look at. There are also different types of tire construction. Some tires are supposed to have a bulge in them and some have very stiff flat side walls. The slicks I am looking at are measured across the widest section of the side wall bulge, not the tread. So even within the same company, two different tires might have two different recommended rim widths. Every tire maker has a rim/wheel size chart. The will usually have the ideal size and then an acceptable range listed. When looking for tires I often have looked backwards, looking at suggested rim size and then looking to see what size tire it is.

---------- Post added at 05:33 PM ---------- Previous post was at 05:32 PM ----------

Originally Posted by YoungBlood View Post
So if I wanted the widest DR i could fit on a stock 17 rim what would that be? it would be a track only setup.
How wide is a stock 17"?
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Old September 5th, 2013, 08:33 PM   #13
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So I guess it is best to check out the tire manufactures recommendations on the size you want. I am wondering about this also,,,,, So if I want to get a continental tire and I really want to go with 265 or 275 then I will have to buy new rims to have the proper setup. I will see what I can afford to do next spring when I get it out of storage since I want to go with koni's, springs and tires. So may be I will try a set of the 255's and save the cost of going with rims and if I decide I want something bigger the next set I will get a set of rims! Then of course comes the next problem.... if I go with rims, what tire will fit without rubbing and what if I want to go with bigger brakes,,,, will the rims fit??? I like buying once so if I go to bigger rims I will go to the size that will fit the tires I want and the brakes I decide on!! Damn Modding !!!!
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Old September 5th, 2013, 08:34 PM   #14
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Originally Posted by YoungBlood View Post
I fit 12.5 tires on 8-9 rims all day on Jeeps that was to keep the wheel tucked in though

And with an 8" side wall.

And you will also notice than rim size can change for the same style and width tire because the aspect ratio or side wall height is different. It's not so much bulge but the angle of the side wall from the rim to the edge of the tread.
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Old September 5th, 2013, 08:53 PM   #15
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I was on discounttiredirect.com put in all the info for a 2007 Mustang GT with 18" wheels, they have optional sizes and it looks like the largest 18" is a 275/45R18. Like Boss said, bigger is not always better. Maybe other members with this size can chime in with their experiences.
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Old September 5th, 2013, 09:59 PM   #16
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I used to run a 265 mt et street on my factory wheel fit great.
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Old September 5th, 2013, 10:26 PM   #17
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I run a 305 on 10.5 in rims and they worlds better than my 285s granted that was on crappy Goodyears, but that thread that Boss posted he link to, WHY THE HELL WOULD ANYONE DO THAT! I could see for drag racing, all that sidewall would be nice but why not get the correct rim and tire for your application. Make me happy I spent the extra money because I never thought I was going to need bigger than a 285 on my car.
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Old September 6th, 2013, 12:25 AM   #18
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For non drag radial tires, max for stock 18x8.5's is 265 width. I'd only recommend 255/45/18 though.
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Old September 6th, 2013, 12:40 PM   #19
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When you guy's say 10" wheel I assume they are only on the back? When it comes time to buy wheels is 9" the way to go if one does not want to be staggered?
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Old September 6th, 2013, 12:51 PM   #20
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Originally Posted by Rankus06 View Post
When you guy's say 10" wheel I assume they are only on the back? When it comes time to buy wheels is 9" the way to go if one does not want to be staggered?
With the right offset you can easily fit 10s up front, I think you can even fit 10.5s but you might need a spacer
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