235-50-18 on GXP - Pontiac G6 Forum
 
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post #1 of 15 (permalink) Old 07-16-2013, 07:17 PM Thread Starter
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235-50-18 on GXP

Looking to replace my tires soon on my 08 GXP sedan. I am thinking about changing the size from the 225/50/18 to 235/50/18. Anyone ever put these on before? Just wondering if I am going to have rubbing issues. Thanks.
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post #2 of 15 (permalink) Old 07-17-2013, 08:42 PM
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don't know anyone that has done that before, but im gonna say you are probly gonna rub if not on the strut itself, then on the wheel well liners why on earth would you want to have a taller tire anyways?

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Bought Feb 28 2009 with 24k miles now has 130k miles RIP Baby death snowplow 1-30-11
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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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post #3 of 15 (permalink) Old 07-17-2013, 09:05 PM
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Handling, braking, acceleration, will all be negatively affected if you go with a larger diameter tire. Much better to stick with the stock size.
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post #4 of 15 (permalink) Old 07-17-2013, 10:13 PM
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it looks like you want a wider tire. So you want to keep the sidewall ratio right. Maybe go with a 235/45 or 235/40. This well get you a wider tire but won't increase the sidewall height.
the sidewall height is figured as a ratio depending on tire width.

Idk what width fits best. But I think you can go as wide as 245 but you may need a spacer to clear the strut
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post #5 of 15 (permalink) Old 07-18-2013, 04:48 AM Thread Starter
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Exactly it. I am trying to go with a little wider tire but keep the same tire height. I cannot stand a lower profile tire. To me the lower the side wall height the more stupid the tire looks on a rim. Looks like you have all rim and no tire. To each is own though. I was just wondering if anyone has put tires on a GXP other than original but without lowering the side wall height and if they had any issues.
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post #6 of 15 (permalink) Old 07-18-2013, 08:39 PM
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then you want 245/45/18 size tires same sidewall height as the factory tires but 2 sizes wider

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 #7 of 15 (permalink) Old 07-19-2013, 04:37 PM Thread Starter
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You mention 2 sizes wider but will that size tire still fit on the factory rims? I am looking to keep using the factory rims and just upgrade the tires.
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post #8 of 15 (permalink) Old 07-20-2013, 11:37 PM
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yes, itll still fit on the factory wheels, that is what im running

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 #9 of 15 (permalink) Old 07-29-2013, 06:34 PM
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everyone says 245/45 are he widest, they look almost identical to the stock size though. g6 has ugly bulkly wheel wells i hate it.
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post #10 of 15 (permalink) Old 07-31-2013, 02:56 PM
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The first number is the tires width in mm. So 245mm is certainly wider than the 225mm tires I believe the G6 came with. Wider tires make for more grip
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post #11 of 15 (permalink) Old 08-03-2013, 12:39 PM
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They are wider your correct. When put on the car the width doesnt only come from the outside. The width is centered therefor it doesnt look much wider from a side view at all.

If your wanting a more aggressive look the 7inch junk wheel aint for you lol.
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post #12 of 15 (permalink) Old 09-27-2013, 10:31 AM
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I agree. I am running the Cobalt SS wheel with 225/50R18. I like it because it looks more like the Bonneville SSEI setup, tire wise. You would be "best" happy with the 245/45R18. Specifically since the "45" is the Percentage of the width "245" so...
Stock side wall is [email protected]%=112.5mm Speedometer reads 60mph @ 60mph
Alternate size is [email protected]%=110.25mm Speedometer reads 60.4mph @ 60mph
Very little difference
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post #13 of 15 (permalink) Old 09-28-2013, 08:56 AM Thread Starter
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245/45/18. Sounds good but still wondering if I will have rubbing issues or not. The gxp has the ground effects that partially come into the wheel well. Anyone have this size on a gxp?
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post #14 of 15 (permalink) Old 09-28-2013, 12:50 PM
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no, you wont have rubbing issues with 245/45/18s on a GXP at stock ride height.......even if you were lowered on coilovers and did rub it would be very minimal

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 #15 of 15 (permalink) Old 10-01-2013, 01:29 PM
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I've got 245/45/20's on my 07 (stock suspension) and have no rubbing problems with them. I 'upgraded' from 235/35/20 when I ended up with a flat and never knew it, LOL. Lost a sidewall that way.

Don't know if this helps, but thought it may.
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