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Discussion Starter · #1 ·
I am thinking of buying a set of G8 GT 19" wheels for my GTO. I know I would have to get the center machined.

My question is about the tire size. The set I am considering come with 245/45/19 size tires. In several of the older posts about the G8 wheels, it seems that most people put tires on these rims with a 35 or 40 side wall. Are the factory G8 tires too big for the GTO? Will they rub on the struts or fenders?

I don't want to get the wheels and then find out they won't work. Thanks.
 

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Well I would think 245/45 will hit jus get 245/35 front and 255 or 265/30 rears should clear .or you can do 35's all around.if I were you I would just get my fenders rolled then you wouldn't half to worry about it at all.
 

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450+rwhp club :D
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Those tires will be about 2" too tall. I'm running 275/30 on the back and 245/35 on the front of my G8 wheels.
 

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Shoot a PM to BAAD LS2. I know he recently put these wheels on his car. He may not have seen this thread yet, but he could tell you what he is running.

However, having owned a G8, I would assume that the stock tires are way too big for the GTO.

For reference:
Stock 18" GTO tire is 235/40/18 - 25.40"
Stock 19" G8 tire is 245/45/19 - 27.68"
 

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Those tires will be about 2" too tall. I'm running 275/30 on the back and 245/35 on the front of my G8 wheels.
Well, there you go. Apparently we hit the reply button at the same time.
 

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Abracadabra Holmes
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Short answer, yes they would rub somewhere I would think. It's quite simple, a 245/45-19 sized tire is 27.7 inches tall. Stock set up's for our car are either 25.4 or 25.7 inches tall depending on 17's or 18's. That is a 2 inch difference which is huge, that would also change your gearing vastly.

Tire Rack has a graph that tells you how talls and the specs on each tire they have, take a look to further help you out. A 255/35-19 would be closer at 26 inches tall and may work, but I'm not certain. Most people go with 275/30-19's to keep the same height, but that's not the ideal tire width for and 8 wide wheel which I assume it would be. Also, you should do a search on this, because I'm certain this topic has been touched before. Good Luck.


Edit, Looks like we all hit the reply button around the same time... haha Yes, BaadLS2 would be the guy to hit up.
 

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Twin Goats...40 yrs apart!!
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For reference:
Stock 18" GTO tire is 235/40/18 - 25.40"
Stock 19" G8 tire is 245/45/19 - 27.68"
Correction on the G8 stock tire size for the sport 19s: They came with 245/40-19s and not 245/45-19s.
 

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Correction on the G8 stock tire size for the sport 19s: They came with 245/40-19s and not 245/45-19s.
You're right. Didn't mean to put that 245/45 was the stock size. That was the size that is on the set of wheels the OP is considering.
 

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Those tires will be about 2" too tall. I'm running 275/30 on the back and 245/35 on the front of my G8 wheels.
What tire Brand/Model are you running?
 

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Pontiac Fanboy
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245/35-19 is the proper size for G8 GT wheels on a GTO.


/thread
 

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I'm running stock size tires on my G8 wheels. Hankook 245/40/19. I had to buy a 5mm spacer from Motorsport Tech to make the front work. It was practically touching and was afraid it would driving the car, so the 5mm put the tire far enough away from the strut.

 

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Id be worried about it rubbing. Looks great though.
 

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Pontiac Fanboy
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Not the best pictures, but 255/35-19s on my car. Fronts have 6mm spacer and ~-1.5 degrees of camber. Rears don't have the spacers on in these pictures.

The only rubbing is on the front fender liners due to caster and rear fender liner's lower lip just barely. None with rear spacers.






The proper 245/35 size will be just fine and you might be able to actually run a little negative camber without a spacer.
 

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450+rwhp club :D
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I'm running -0.9 camber in the front and rear with no spacers and no rubbing. But I have coilovers.
 

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Discussion Starter · #19 ·
Not the best pictures, but 255/35-19s on my car. Fronts have 6mm spacer and ~-1.5 degrees of camber. Rears don't have the spacers on in these pictures.

The only rubbing is on the front fender liners due to caster and rear fender liner's lower lip just barely. None with rear spacers.






The proper 245/35 size will be just fine and you might be able to actually run a little negative camber without a spacer.
Those look amazing with the black color of your car.

I have decided to not get the G8 wheels. I am thinking of going with a staggered set of Gunmetal VMR 710 wheels.
 
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