GXP tires - Pontiac G6 Forum
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post #1 of 19 (permalink) Old 11-10-2012, 02:17 PM Thread Starter
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GXP tires

Anyone ever put different size tires on the factory rims? I would like to have wider tires but still want tire height.
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post #2 of 19 (permalink) Old 11-10-2012, 02:42 PM
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Tire height is directly related to tire width. You're getting into the Sidewall Aspect Ratio here.
For example: The G6 came with 2 size tires for the 17" Rims. 215/55R17 and 225/50R17
My car came with the 215/55R17, It was 215mm wide with a sidewall ratio of 55% to fit a 17 inch rim. So the sidewall from rim to tread is 55% of the width of the tire. If we convert 215 to inches we get 8.46 inches, 55% of that is a tire height of 4.65 inches

The wider tire is 225/50R17, so being 225mm wide we get 8.85 inches, 50% of that is a tire height of 4.43 inches. So the wider tire is only about 1/4 inch shorter.

But if you were to get a 225/55R17 then the sidewall would be 4.87 inches tall. But you can't find a performance summer tire in this size easily.

With that being said, you can fit as wide a tire as the rim would take, and the wheel well would clear, but would need a higher sidewall ratio to make up the sidewall, Keep in mind that you can get into some oddly sized tires and start spending more money.

I would recommend checking out TireRack.com You can search by car, or by tire size and get a good idea for tires, sizes, performance ratings. It's a great place for information and to really make an informed decision on tires.

I hope this helps!
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post #3 of 19 (permalink) Old 11-23-2012, 09:37 AM
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most guys with the factory 18" wheels are running 245/45/18 tires, 245 is the widest you can fit on the stock 7" wide wheels

2008 Pontiac G6 GT Dark Gray Metalic
Bought Feb 28 2009 with 24k miles now has 130k miles RIP Baby death snowplow 1-30-11
https://www.g6ownersclub.com/forum/showthread.php?t=4757

Carbon Black Metalic 2009 G6 GXP Coupe
Bought Oct 8 2010 with 35 miles

Mods so far: every single performance mod and a whole lot more, fastest NA G6
https://www.g6ownersclub.com/forum/showthread.php?t=7974

1/4 mile: [email protected] 109.23

Performance Red Metalic 2009 G6 GXP coupe
bought june 29 2012 with 3400 miles

Mods: RACE CAR- full race fuel setup and in the process of converting to RWD with a 6spd manual trans
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1/4 mile: [email protected] 101.95
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post #4 of 19 (permalink) Old 02-12-2013, 08:14 PM
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Im running 225 on the gxp atm look a tad skinny deff wanting a more aggresive look. 245/50/18 will that work?
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post #5 of 19 (permalink) Old 02-13-2013, 06:00 AM
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get some 245/45/18's i run dunlop direza Z1 star specs in the summer and they are the best tires you can buy......however theyve become very expensive in the last 2 years...... they were $200/piece the first year i got them, now they are going for $251/ea on tire rack

2008 Pontiac G6 GT Dark Gray Metalic
Bought Feb 28 2009 with 24k miles now has 130k miles RIP Baby death snowplow 1-30-11
https://www.g6ownersclub.com/forum/showthread.php?t=4757

Carbon Black Metalic 2009 G6 GXP Coupe
Bought Oct 8 2010 with 35 miles

Mods so far: every single performance mod and a whole lot more, fastest NA G6
https://www.g6ownersclub.com/forum/showthread.php?t=7974

1/4 mile: [email protected] 109.23

Performance Red Metalic 2009 G6 GXP coupe
bought june 29 2012 with 3400 miles

Mods: RACE CAR- full race fuel setup and in the process of converting to RWD with a 6spd manual trans
https://www.g6ownersclub.com/forum/sh...ad.php?t=13140
1/4 mile: [email protected] 101.95
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post #6 of 19 (permalink) Old 03-04-2013, 05:09 AM Thread Starter
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Anyone have any pics of there G6 GXP with factory wheels but different size tires? I am going to have to replace tires probably this summer on mine and I would like to go with some tires a little wider to give it a better stance. I will probably look into this size 245/45/18 but I was not even sure they would fit on factory rims. Sure would help to see some pics of G6's with these tires on. Anybody?????? Thanks.
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post #7 of 19 (permalink) Old 03-04-2013, 08:26 PM
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sexy g6 has different size tires. im sure he will respond sooner or later.
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post #8 of 19 (permalink) Old 03-25-2013, 06:00 PM Thread Starter
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So nobody has any pics of their G6 with 245/45/18 tires??? Was really hoping to see some.
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post #9 of 19 (permalink) Old 03-25-2013, 06:03 PM
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Quote:
Originally Posted by Scott71 View Post
So nobody has any pics of their G6 with 245/45/18 tires??? Was really hoping to see some.
i do somewhere, ill just have to find them

2008 Pontiac G6 GT Dark Gray Metalic
Bought Feb 28 2009 with 24k miles now has 130k miles RIP Baby death snowplow 1-30-11
https://www.g6ownersclub.com/forum/showthread.php?t=4757

Carbon Black Metalic 2009 G6 GXP Coupe
Bought Oct 8 2010 with 35 miles

Mods so far: every single performance mod and a whole lot more, fastest NA G6
https://www.g6ownersclub.com/forum/showthread.php?t=7974

1/4 mile: [email protected] 109.23

Performance Red Metalic 2009 G6 GXP coupe
bought june 29 2012 with 3400 miles

Mods: RACE CAR- full race fuel setup and in the process of converting to RWD with a 6spd manual trans
https://www.g6ownersclub.com/forum/sh...ad.php?t=13140
1/4 mile: [email protected] 101.95
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post #10 of 19 (permalink) Old 03-25-2013, 06:20 PM Thread Starter
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Actually from reading now I'm thinking 235/50/18 might be better. Anyone have any pics with this size?
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post #11 of 19 (permalink) Old 03-25-2013, 06:47 PM
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235/50? eww lol going even higher sidewall lol, they might not even fit under the sping perches at that height, idk........

heres some pics of 245/45/18











2008 Pontiac G6 GT Dark Gray Metalic
Bought Feb 28 2009 with 24k miles now has 130k miles RIP Baby death snowplow 1-30-11
https://www.g6ownersclub.com/forum/showthread.php?t=4757

Carbon Black Metalic 2009 G6 GXP Coupe
Bought Oct 8 2010 with 35 miles

Mods so far: every single performance mod and a whole lot more, fastest NA G6
https://www.g6ownersclub.com/forum/showthread.php?t=7974

1/4 mile: [email protected] 109.23

Performance Red Metalic 2009 G6 GXP coupe
bought june 29 2012 with 3400 miles

Mods: RACE CAR- full race fuel setup and in the process of converting to RWD with a 6spd manual trans
https://www.g6ownersclub.com/forum/sh...ad.php?t=13140
1/4 mile: [email protected] 101.95
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post #12 of 19 (permalink) Old 03-26-2013, 03:44 PM
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Looks good. I actually just started looking at which tires I'd run when I get the wheels I want. My buddy is pushing 255 width. Not sure it'll fit. ha
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post #13 of 19 (permalink) Old 06-21-2013, 06:23 PM Thread Starter
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Anyone run their gxp with 235-50-18's? I like this size the best just not sure if there will be any rubbing issues.
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post #14 of 19 (permalink) Old 06-26-2013, 08:21 AM
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Quote:
Originally Posted by Scott71 View Post
Anyone run their gxp with 235-50-18's? I like this size the best just not sure if there will be any rubbing issues.
I have 235-45-18s
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post #15 of 19 (permalink) Old 06-26-2013, 04:09 PM
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i have 7.5 in wide rims with 245/40/18s




this is what it looked like with 225/40s looked like pretty goofy
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