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Discussion Starter #1
Has anyone ran a 285/40ZR19 tire on the rear of a 14 SS with the stock wheel? If so did we’re there any issues and of course with someone sitting in the back? I was looking at the Kumho Ecsta PS91’s with stick with the stock 245/40 on the front.
 

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I was reading some about this exact issue this morning. From what I saw the 275 is the widest recommended tire on a 9" rim. Anything wider the tire can bulge in the middle and cause uneven wear and also under hard cornering cause issues. I want to do the same myself so interested in what people have to say.
 

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You shouldnt put a 285 on a 9" rim especially on a heavier sports car. It's dangerous.
Wider tires don't have better grip.
If you want good grip and cornering then get Michelin Pilot Sport 4S.
Rides great and holds traction with my procharger setup making almost 600whp.


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I second the Pilot Sport 4s. They are pricey, but I believe they are perhaps the best all around performance tire you can get. I run a 285/35/20 I believe in the back, but am on Vossen's installed by previous owner.
 

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Several owners in our Nor/Cal group are running 285's in the rear, they fit just fine and zero rubbing on a stock height SS with the OE 19" wheels. My son has 255/285's on his otherwise stock 2015 and next time I need rears I'll be going 285 on mine.
 
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I've had Conti Extreme Sport 285s for several years. Many road trips with overloaded trunk & packed rear seat - no troubles at all.
 
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I run 285/30 and 255/35 Michelin PS4's on stock wheels. The way the this tire is made fits the wheel perfectly.
 

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I run 285/30 and 255/35 Michelin PS4's on stock wheels. The way the this tire is made fits the wheel perfectly.
Are you sure about those sizes Willy?
I can't find either the PS4 or the PS4S (currently) listed in a 285/30-19 size, just 285/35, and that's only with the PS4S. Also, running those sizes makes it almost an inch smaller in diameter compared to stock. I think the 285/35 and 255/40 sizes come out much closer to stock diameter.
Lastly, it's always a bit confusing to distinguish whether someone means the PS4 or the PS4S tires when they refer to a set of "PS4's"
 

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No, I'm not sure,,,who do you think I am?
I'm an ol'dood, I'll go and check it. And it's PS4S tires.
 

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You're right it's 285/35 - 255/40.
Memory served me wrong.
 

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Cool, it’s the rear’s that had me. I have 275/40zr19 on there now and the inner fender is close.
That could also be because that tire size is more than an inch taller in diameter than the stock size.

284636


If that doesn't bother you, then it's effective gearing change should (i.e. your car is now slower).
 

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Isn't the stock size 275/40?
I'm running 285/35 and my speedo spot on(according to the radar readings around town).
 

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Isn't the stock size 275/40?
I'm running 285/35 and my speedo spot on(according to the radar readings around town).
No, stock is 275/35 Rear and 245/40 Front

The 285/35 is not too far off from the 275/35 though, just around 1%

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Discussion Starter #16
@willy92 thats what I thought as well cause that’s what the dealer put on there when I first got it. But hey, it’s my daughter’s car with her only being 16 I’m just gonna stick with a 40 series.
 

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@willy92 thats what I thought as well cause that’s what the dealer put on there when I first got it. But hey, it’s my daughter’s car with her only being 16 I’m just gonna stick with a 40 series.
Of course, it goes without saying (because it is the stock front size), but in a 40 series, the 245 width is the one that will keep your calibrations spot on. BTW, mounting a 245 width on the stock rear wheels is still within Michelin's specified acceptability range.
 

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The stock size is 245/40
I'm running 285/35 rears.
 
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I've run the one size wider front and rear ever since I wore out the stock tires.
over 100K miles on the car and never an issue with those tire sizes.
Including winter driving in Michigan..
 

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Has anyone ran a 285/40ZR19 tire on the rear of a 14 SS with the stock wheel? If so did we’re there any issues and of course with someone sitting in the back? I was looking at the Kumho Ecsta PS91’s with stick with the stock 245/40 on the front.
I have a 2014 with stock wheels. I run the 245/40/19 Continental Extreme Contact II on my car. I drive this car often and even have run it through the "Dragon" in Tennessee with no issues. I also put down a lot of HP to ground. No issues or rubbing. (It is close on inside of wheel well)
 
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