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post #1 of 45 (permalink) Old 07-02-2008, 09:35 AM Thread Starter
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Widest tires?

Anyone in the 295+ widths?

04 C5Z - only things stock are some of the body panels.
04 Avy 2500 - Daily driver gas annihilator.
09 G8 GXP*** constantly lurking for one when the prices get nicer then off for road race mods.
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post #2 of 45 (permalink) Old 07-02-2008, 10:20 AM
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Originally Posted by OKsweetrides View Post
Anyone in the 295+ widths?
To do that you would have to get a 10" rear rim with a +50 (or so) offset. I have yet to find or see a rim with those specs. You would likely have to do custom.
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post #3 of 45 (permalink) Old 07-02-2008, 12:17 PM
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The guys down at CCW are experimenting right now, they're the ones who got my offsets on the GTO perfect so I can run my 335s. I'll see if I get a chance to call John and find out what size they are up to.
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post #4 of 45 (permalink) Old 07-02-2008, 02:02 PM Thread Starter
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^^^ I had no idea 335's could fit on a goat.

oddly enough, I was actually contemplating some CCW classics or 550's in 18" wheel size assuming that they should work with the forthcoming GXP version.

I assume it'll be a bit on the funky side when it comes to wheel specs, but I think that wide of a tire would look very good on a G8.

04 C5Z - only things stock are some of the body panels.
04 Avy 2500 - Daily driver gas annihilator.
09 G8 GXP*** constantly lurking for one when the prices get nicer then off for road race mods.
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post #5 of 45 (permalink) Old 07-07-2008, 01:24 PM
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Originally Posted by Mr. Sandog View Post
To do that you would have to get a 10" rear rim with a +50 (or so) offset. I have yet to find or see a rim with those specs. You would likely have to do custom.

We have exactly that part number in stock.
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post #6 of 45 (permalink) Old 07-07-2008, 10:14 PM
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Originally Posted by OKsweetrides View Post
^^^ I had no idea 335's could fit on a goat.

oddly enough, I was actually contemplating some CCW classics or 550's in 18" wheel size assuming that they should work with the forthcoming GXP version.

I assume it'll be a bit on the funky side when it comes to wheel specs, but I think that wide of a tire would look very good on a G8.
Well, my GTO is far from stock. I run flares front and rear that allow me to run the wider tires. 275 is about the largest you can go on a stocker. I've got 12 months left on the Silverado lease and then I get to start playing with the G8.
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post #7 of 45 (permalink) Old 07-08-2008, 12:37 PM
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Would 275s in the back rub or bottom out with two people in the rear seat any stuff in the trunk?
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post #8 of 45 (permalink) Old 07-08-2008, 01:04 PM
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We've done the following with no issues (assuming offset is correct);
285/40-18
285/35-19
295/35-19
285/30-20

the 275/35R19 will not fit the OE wheels, neither will a 255/40R19
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post #9 of 45 (permalink) Old 07-08-2008, 01:05 PM
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What is the widest size that will fit on the front without rubbing lock to lock?
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post #10 of 45 (permalink) Old 07-08-2008, 02:37 PM
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On the OE wheel, just the 245/40R18. On an 8.5" wide (or wider) wheel 255/40R19 is biggest based on our conservative measurements.
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post #11 of 45 (permalink) Old 07-08-2008, 03:27 PM
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Why do you say the 255/40/19 does not fit the OE 19's, is it rubbing or are you saying it wont fit the wheel?
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post #12 of 45 (permalink) Old 07-08-2008, 03:43 PM
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A 255 fits the car (no rubbing) but is too wide for the stock wheel.

At least that is how I am reading it.
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post #13 of 45 (permalink) Old 07-09-2008, 08:20 AM
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Yep, 255 needs an 8.5" wide (or wider) wheel, OE is 19x8.

Last edited by TireDoc; 07-11-2008 at 03:51 PM.
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post #14 of 45 (permalink) Old 07-11-2008, 12:03 PM
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Uh, Ive run 265's on a 8" wheel, The 245's don't even poke out enough to protect the wheel, a 255 or 265 should fit no problem.
Some tire companies 255's are equal to some companies 245's. Nitto's run terribly small in width. I would think a 265 would fit, maybe hard for the tire guy but well worth it. Most tire companies give a suggested wheel size and some list 8" for 255.

Edit,

Just looked up several tire mfg's and they list a 255/35 or 255/40 to be acceptable on a a 7.5" rim

2008 Panther Black G8 GT with Sport, Premium, RotoFab CAI, VMS HSRK and Cortex Tuner 93 octane
1969 Tempest Custom-S, Full Tubular suspension, 4 wheel disc brakes

Last edited by tntempest; 07-11-2008 at 12:18 PM.
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post #15 of 45 (permalink) Old 07-11-2008, 03:58 PM
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Quote:
Originally Posted by tntempest View Post
Uh, Ive run 265's on a 8" wheel, The 245's don't even poke out enough to protect the wheel, a 255 or 265 should fit no problem.
Some tire companies 255's are equal to some companies 245's. Nitto's run terribly small in width. I would think a 265 would fit, maybe hard for the tire guy but well worth it. Most tire companies give a suggested wheel size and some list 8" for 255.

Edit,

Just looked up several tire mfg's and they list a 255/35 or 255/40 to be acceptable on a a 7.5" rim

Didn't look at all 16 of my suppliers, but Bridgestone, Continental, Dunlop, Goodyear, Hankook, Michelin, Pirelli, Sumitomo and Yokohama require a 8.5" width minimum for 255/35R19 or 255/40R19. The tire would mount up to an 8" wide wheel without too much problem, but the tire manufacturers couldn't say how long they'd stay on.

Last edited by TireDoc; 07-11-2008 at 04:09 PM.
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post #16 of 45 (permalink) Old 07-11-2008, 05:20 PM
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Here is a Pirelli P-zero 255/45/19 recommended on a 8"

http://www.wheelenhancement.com/tirespecs.php?tireid=21

Tire rack shows 275/35s rear optional.

I cant find the other site that showed 7.5" for all the mfg.s

2008 Panther Black G8 GT with Sport, Premium, RotoFab CAI, VMS HSRK and Cortex Tuner 93 octane
1969 Tempest Custom-S, Full Tubular suspension, 4 wheel disc brakes
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post #17 of 45 (permalink) Old 07-11-2008, 05:30 PM
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Sure, a 255/45R19 will fit an 8". You are correct. Its just taller than we can guarantee to fit.
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post #18 of 45 (permalink) Old 07-11-2008, 05:34 PM
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Quote:
Originally Posted by TireDoc View Post
We've done the following with no issues (assuming offset is correct);
285/40-18
285/35-19
295/35-19
285/30-20

the 275/35R19 will not fit the OE wheels, neither will a 255/40R19

What was the offset on the 295's? I'm assuming they were on a 10" wheel, right?
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post #19 of 45 (permalink) Old 07-11-2008, 09:50 PM
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I'm looking at getting wheel sizes 20x8 for the front and 20X9.5 for the back. 245/35/R20 up front and 275/30/R20 out back.

I'm guessing I should have no rubbing issues with the wheel turned lock to lock and no rubbing in the back even with rear passengers and luggage in the trunk.
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post #20 of 45 (permalink) Old 07-11-2008, 11:05 PM
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Would it be possible to run 275/35/R20 on 9.5 wheel with no rubbing or bottoming out?
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