Thread: GXP rims on a GT

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  1. #1 GXP rims on a GT 
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    I bought a 2005 gtp today with GXP rims and the car needs new tires.. I know the gxp uses different size tires on the front and back. What size should I put on my gtp? Should i put all the same size ?
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  2. #2 Re: GXP rims on a GT 
    GTX Level Member industrialfish's Avatar
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    Check to make sure you actually have 2 different sized rims first. People like to swap them to have 4 of the same size when putting them on other cars.

    You can run all the same tire even if they are staggered. I don't know what the best tire is for that, but I know it's been brought up on here before.
    2005 GTP - Graystone Metallic|SPO grills&spoiler/SE lip/Carbon Fiber INFERNO hood
    7"
    Spectre|3.4 MPS|42lb Blue Giants+E85+Walbro 450lph pump
    SpeedDaddys|AL605|Vogtlands on FE3s|Vinnie's Spacers on solid lowers|Intense poly uppers|
    Dorman + Addco sway bars|Drilled/slotted rotors|Plasti-dip 17" QP2 at +27 offset
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  3. #3 Re: GXP rims on a GT 
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    Same size rims. They are the GXP rims. Tire size is all the same st the moment 345-45-18.
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  4. #4 Re: GXP rims on a GT 
    GrandPrix Junkie SgtMarshal's Avatar
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    are you sure it's a 345? i'm willing to bet you meant to say 245. if that's the case I would stick with that size because it's way more common than the size on the actual GXP. ask me how i know.
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  5. #5 Re: GXP rims on a GT 
    GTX Level Member industrialfish's Avatar
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    Quote Originally Posted by GrandPrix1118 View Post
    Same size rims. They are the GXP rims.
    GXP comes factory with 18x8 rims in front, but 18x7 rims in back.
    2005 GTP - Graystone Metallic|SPO grills&spoiler/SE lip/Carbon Fiber INFERNO hood
    7"
    Spectre|3.4 MPS|42lb Blue Giants+E85+Walbro 450lph pump
    SpeedDaddys|AL605|Vogtlands on FE3s|Vinnie's Spacers on solid lowers|Intense poly uppers|
    Dorman + Addco sway bars|Drilled/slotted rotors|Plasti-dip 17" QP2 at +27 offset
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  6. #6 Re: GXP rims on a GT 
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    It has 245/45/18 s on it. Front and back. So if I have GXP rims. Just make sure the 18x8s are in the front ?? Also I think I have a GT. When I start it up. It says wide track on the screen. I believe it was top swapped with supercharger / heads
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  7. #7 Re: GXP rims on a GT 
    GTX Level Member industrialfish's Avatar
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    It won't make a difference on a non-GXP, because GXP suspension is different, but yeah wider in front on a FWD. Being in Detroit, it's entirely possible you have aftermarket Alcoa "GXP" rims, as they are all over craigslist for a good price.


    GTP says "Widetrack" too. Does your info center have an "Engine Boost" page?
    2005 GTP - Graystone Metallic|SPO grills&spoiler/SE lip/Carbon Fiber INFERNO hood
    7"
    Spectre|3.4 MPS|42lb Blue Giants+E85+Walbro 450lph pump
    SpeedDaddys|AL605|Vogtlands on FE3s|Vinnie's Spacers on solid lowers|Intense poly uppers|
    Dorman + Addco sway bars|Drilled/slotted rotors|Plasti-dip 17" QP2 at +27 offset
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  8. #8 Re: GXP rims on a GT 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    245/45/18 is what you need to stay with for correct speedo read out.

    SMGPFC Member #1
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  9. #9 Re: GXP rims on a GT 
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    Yes. It says engine boost. Like when you hit the gas. The bar fills up. Other than that, nothing else about boost. The trunk says GT but the guy I bought it from said he replaced the trunk. What else are some signs that it’s a GTP or a GT?
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  10. #10 Re: GXP rims on a GT 
    GTX Level Member industrialfish's Avatar
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    The trunk has the RPO codes, so that's out.

    If it's got a supercharger, it's probably factory. Look at the intake and manifolds. Topswaps are a lot of work, you wouldn't do one and not upgrade those too. If it was sold to a dealership, the VIN wouldn't match the engine type either and might raise some flags.
    2005 GTP - Graystone Metallic|SPO grills&spoiler/SE lip/Carbon Fiber INFERNO hood
    7"
    Spectre|3.4 MPS|42lb Blue Giants+E85+Walbro 450lph pump
    SpeedDaddys|AL605|Vogtlands on FE3s|Vinnie's Spacers on solid lowers|Intense poly uppers|
    Dorman + Addco sway bars|Drilled/slotted rotors|Plasti-dip 17" QP2 at +27 offset
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