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CTS V
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Discussion Starter #1
Just curious. I am not a tire guy.. What is the widest tire we can fit on the stock rims? My car has very limited traction and I would like to stuff a larger drag radial out back if possible.
 

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'05 CTS-V
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51 Posts
If you would have SEARCHED, you would've found the answer!!! duh
lol, I'm just saying that cause I just asked the question too and should've searched first.

The responses I got were that people do put a 275 on the stock rim, but it is a bit big for it. I think 265 should be fine (hopefully cause that is the one I am buying). A 235 should fit fine on the front right? (sorry for the thread jack)
 

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2007 Escalade
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If you would have SEARCHED, you would've found the answer!!! duh
lol, I'm just saying that cause I just asked the question too and should've searched first.

The responses I got were that people do put a 275 on the stock rim, but it is a bit big for it. I think 265 should be fine (hopefully cause that is the one I am buying). A 235 should fit fine on the front right? (sorry for the thread jack)
Yes. I have 245 all the way around with no issues.
 

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2005 Platinum CTS V-Headers+3in pipes
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A 235 should fit fine on the front right? (sorry for the thread jack)
it will fit but WHY would you go smaller then stock??? :hmm:
 

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CTS V
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Discussion Starter #6
sorry guys I am still new to this site and trying to figure out how to search. I should of looked more. they come stock 245 45 18 so if I keep 245 45 up front your all saying a 265 45 18 should fit ok in the back?
 

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'05 CTS-V
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Cause the tire set I am looking at comes with 2 235s and 2 265s.


Yes. I have 245 all the way around with no issues.
I would hope so, that is the stock size ;)


edit*
Yes dyno, 265s on the back will be fine!

oh, and the faq just explains the largest tire you can put in the wheel well, it isn't for the stock rim.
 

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Maggie'd 05 CTS-V
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If you're going 265 you should step down to a 40 series, less sidewall, better handling and its closer to the stock size for your speedo and traction control.

265-45-18 2.7% slow
265-40-18 1.3% fast

http://www.miata.net/garage/tirecalc.html <---Great for checking sizeing vs stock to keep your rolling diameter as close as possible, has nothing to do with tire width vs rim width though.
 

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'06 Z06, '05 CTS-V 453rwhp/434rwtq (sold)
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I have 265/40s and they work good.
 

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Cadillac CTS-V
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I have 255/40s (currently GSD3s and I had KDW2s) and they don't rub at all on a lowered car.
My next set I will probably try 265/40 all around.
 

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2012 CTS-V Sedan, 2011 CTS Coupe, 2010 Ford Raptor
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275 in the rear work fine for me. 245/40 front 275/35 rear.

 

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E85 Powered - Maggie'd V
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Whats the biggest size tire that'll fit with GC's on their lowest setting? (stock wheels)
 

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2012 CTS-V Sedan, 2011 CTS Coupe, 2010 Ford Raptor
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Whats the biggest size tire that'll fit with GC's on their lowest setting? (stock wheels)
275...just drop the profile. Mine are 275/35
 

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CTS V
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Discussion Starter #15
whisler, do you have any problem with the rear tires wearing uneven on that wide of a tire?
 

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2010 Thunder Gray 6MT
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Eagle GSD 275/40/18's in rear, no drop, no rub. Tire runs wide.

 

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whisler, do you have any problem with the rear tires wearing uneven on that wide of a tire?
Ever since I drove it off the lot the tires have worn on the inside. This will be the first summer with the 275s so we will see how they do. (I drive a lot harder when the weather is nice)
 

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CTS V
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Discussion Starter #18
ok i was just curious if they balloon a little and wear funny.. Let me know. I will need a new set of tires soon and I am just trying to decide what I can get away with.
 

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2005 Stealth Gray CTS-V, 2009 Black CTS-V
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Just know that running 275s on an 8.5" rim will often generate a much different feeling than running a 245 tire. There's a reason that they recommend 275s on a minimum 9" rim...

Personally, I can't stand tire "roll-over." This is my own bogus term and it refers to a situation whereby the tire feels like it "rolls" over the rim. I ran the 275 Goodyear GSD3s (IIRC) on the rear, which seemingly everyone loved, and I took those suckers off within 300 miles it was so awful feeling...

What felt so bad? Well, imagine going down the highway at, say, 75 mph and you change lanes quickly or, heck, let's be really basic---just gently toss the steering wheel in either direction to feel how "planted" the car feels...with 275s on the rear the answer for me was, "NOT AT ALL."

Holy sh*t--the a$$ of the car was as unstable as the economy with Bush in charge; it loved to roll back and forth, as it was easy to get the sidewall to roll over the rim. If you ever wanted to swing the a$$ of the car around, 275s on 8.5" rims would be the ticket...as a matter of fact, that's about the only advantage I felt there was, for it sure as heck wasn't handling...

Think that runflats, with a super-stiff sidewall, could solve that? Well, I tried that as well and the answer was a resounding NO. Better than the Goodyears? Heck yeah, but it still did it.

When I went to a 10" rim on the rear, "WOW!" was what I said and the difference was immediate as it was noticeable. The car drove (& currently drives) like its supposed to.

My recommendation would be to go 255s all the way around. No rubbing issues, no speedo issues, no rotation issues, nothing. And they work wonderfully on 8.5" rims.

I didn't like 265s, as too many people had rubbing issues in the front and I didn't like any staggered setup with 265s.

But 275s on 8.5" rims? Not for me ever again. I know well that many will speak about how great it is, and more power to them if they like it, but if you like a "stable" car, raise an eyebrow, for it's a FAR different feeling than I believe it otherwise should be.
 
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