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  1. #1
    DUI BABY Bio248's Avatar
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    Default Got some wheel questions? In here!!

    Here is my second addition to the boards: The end all be all wheel thread.

    Everyone has questions on what wheels they can and cannot run. The first thing you need to think of when buying wheels is WHAT TIRE DO I WANT TO RUN? This will help you decide on what you can run for wheel specs. Most of the people like to go with a little wider tire for that performance look and a slightly lower offset wheel than stock. this is usually the best combo for fitment. Normally a little better tire than stock will be a 235 or 245 series wide since the stock tire is a 225. On most wheels you'd be able to run a 255 wide tire and still get away with it. however, the lower you go and the more aggressive of fitment you run with the wheels, the harder it is to fit everything without rubbing. The stock wheels have an offset of +52mm and you can tell they sit into the wheel well fairly far. This means we have a bit of room to move out with a lower offset wheel for that aggressive look we all want. I would normally say that the BEST offset (so long as its not too wide and not that big of wheel) is in the area of +38mm give or take a few millimeters in either direction.

    Tire sizing

    The stock tire size is 225/60/16. Here are the sizes for wheels that have the same overall diameter and that are most typical for people to run:

    235/55/17
    245/50/17
    235/50/18
    245/45/18
    235/45/19
    245/40/19
    245/40/20
    245/35/20


    Wheel bolt pattern

    Our cars stock have a 5x115 bolt pattern. Now that's all fine and dandy, but wheels with a bolt pattern of 5x114.3 also fit. If they wobble or vibrate a lot you may need to run hubcentric rings, but that is all you would need in order to run them. Some people say that the slightly smaller bolt pattern puts stress on the studs and will snap them when driving aggressively. There are a ton of people who have been running that bolt pattern for years who would argue hardly against that point. This means that as well as some GM fitments, you can also look for mustang, eclipse, maxima, etc. wheels because they have the same bolt pattern. The thing that matters is the hub bore. So long as the hub bore is the right size then you're good.

    *NOTE: THIS THREAD IS ASSUMING YOU WILL BE RUNNING A TIRE AND WHEEL SIZE THAT IS VERY CLOSE, OR WITHIN 3% OF THE STOCK TIRE SIZE (OVERALL DIAMETER). For a great website to compare tire sizes, go to 1010TIRES.COM and check out their tools.*

    If you want to run a 235/245 tire:

    With the tire size usually close to the stock overall diameter, you should be able to follow these offsets for easier fitment:

    17" wheel, up to 8.5" wide: +32mm offset to +50mm offset
    18" wheel, up to 8.5" wide: +35mm offset to +48mm offset
    19" wheel, up to 8.5" wide: +38mm offset to +45mm offset
    20" wheel, up to 8.5" wide: +38mm offset to +42mm offset
    etc.
    etc.

    You want to be able to run a wider wheel or a lower offset, then continue on and learn a little more about aggressive wheel fitments.

    Aggressive wheel fitments: Hellaflush and DUBs

    Many people want to push the limits on the wheels they are able to put into their car. I will not go into lifting kits because I am completely against them and at no point would I ever recommend using a wheel setup that will exceed the stock overall diameter for the stock wheels (reference 1010TIRES.COM tire size calculator). There are a few ways to get wider wheel and tire setups as well as bigger wheels into the fenders without rubbing. You can either run a 'correct' offset and sized wheel/tire combo (which we all know is no fun at all), or you can get into some fender work.

    With enough fender work I would venture to guess that you could run down to a +15mm offset, but this is assuming you will be rolling and pulling all the fenders on the car. Fortunately Pontiac has made this super easy for us and I can tall you right now that if you have a little patience to work on the car then you can do fender work.

    Within the 'how to' section there are two write ups on rolling your fenders. I suggest you follow THIS link instead of the second link that suggests cutting the fenders (rolled_fender_2). The fenders are easily enough rolled with a heat gun and a rubber mallet. You need the heat gun because you need to keep the paint HOT to the touch, but not hot enough to bake the crap out of it. This will prevent the paint from cracking, which WILL peel. You want it to be too hot for you to hold onto, but touching it for a moment is okay. Now, temperature is relative, so don't go overboard. I have personally rolled all the fenders on the car this way and it is no harder than whacking the fenders a bunch of times. Start out hitting the fender lip SOFTLY and get harder. You have to find out how hard you have to hit the fender lip to bend it because no one can describe it exactly to you. Start in the middle and work your way out, but make sure to keep the bend even all the way across. Don't bend the middle in before the sides, go back and forth and do the WHOLE FENDER all at once. This will prevent the fender from creasing anywhere. It might take a while, but once you figure out the first fender, the other three are easy.

    Rolling your fenders will give you a bunch of clearance for running a wider wheel or bigger tires in comparison to how they are stock. You gained yourself at least an inch more of room. However, if rolling your fenders does not clear the wheel and tire setup you are trying you run we have to go for more drastic measures: pulling the fenders. If you want to pull your fenders I HIGHLY suggest using a fender rolling tool (reference the 'good' link for fender rolling, its option 2). You can rent these tools online as well as buy your own if you're really looking to spend a big chunk of money on a tool youll use once. Just go to google and search 'fender rolling rool rental' and a bunch of places will pop up. Getting the tool is up to you.

    What you want to do is to gradually tighten up the fender roller up and roll it back and forth on the fender. Using it to roll the fender is easy enough, but to ROLL the fenders you need to take it a step farther. Continue to tighten up the rolling tool and rolling it until you 'flare' the fender. This will give added clearance for your wheels. How much you want to pull the fenders is up to you and your needs. Once you go far enough you WILL end up creasing the fenders or making them 'wavy'. Only run as much pull as you need. Also, remember that even with the fender rolling tool you STILL NEED HEAT. REMEMBER YOUR HEAT GUN.

    The biggest wheels and lowest offset wheels I have seen on a grand prix thus far are +24mm 18x9 mustang wheels. All fenders were rolled to make this setup work and the car wasn't severely lowered.

    I hope this has helped everyone to help themselves with choosing a wheel and tire setup. If you stay within the normal ranges of offsets within a certain sized wheels then you will be just fine. Anything beyond these 'normal' setups and I cannot guarantee that they will not rub, nor will I guarantee they won't rub even if you are within the limits. All wheels and tires are made differently and everyone's suspension setup is also different.

    Now...someone show me how hellaflush they can get!


    and an addition from another member:

    Quote Originally Posted by CadVetteStang
    I made this chart back in 2008. Wheel width and backspacing is listed in inches. Offset is listed in millimeters.



    Here’s how it works: If you are thinking of buying a set of wheels and the seller posts the width and offset, you can use the chart to find the backspacing to see if it will work on your car.
    Example: a 8” wide wheel with 35MM offset has between 5.75” and 6” backspace.

    Or, if you are in a salvage yard and measure a set of 9” wide wheels that has 6.5” of backspacing, you can use the chart to see that it has a 38MM offset.

    The picture prints out okay as an 8X10 to hang in your shop or as a 3X5 pocket guide when you go shopping.

    Enjoy.

    Cody

  2. #2
    GTX Level Member Ridin ON Chrome's Avatar
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    Default Re: Got some wheel questions? In here!!

    Nice dude...

    I have seen 20x10s fit on the front of a GP. Jason on clubGP has them and they look good. Running some 285/30. I will have to ask him about the offset.


    98 GTP-Mods? Yeah, lots of them
    2009 HEMI RAM- Mods are in the works!!

    01 Regal GS-SOLD :-(

  3. #3
    DUI BABY Bio248's Avatar
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    Default Re: Got some wheel questions? In here!!

    yeah, i know there are a bunch of guys out there running some big wheel and tire setups.

  4. #4
    EX GTP OWNER shawngtp's Avatar
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    Default Re: Got some wheel questions? In here!!

    Gread job BIO now you just need some pix for examples or offsets just to show people what you are talking about. Great info thanks again!!!

  5. #5
    DUI BABY Bio248's Avatar
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    Default Re: Got some wheel questions? In here!!

    Quote Originally Posted by shawngtp View Post
    Gread job BIO now you just need some pix for examples or offsets just to show people what you are talking about. Great info thanks again!!!
    good call. ill try and add that given that a few people can help me out with some pictures.

  6. #6
    GTX Level Member Ricky21's Avatar
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    Default Re: Got some wheel questions? In here!!

    i have 20X9 on mine and now wishing i didnt get em. i think they look good on it. they rub on the back tho when i hit bumps and there to heavy and im woried about my tranny

  7. #7
    GTX Level Member Ridin ON Chrome's Avatar
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    Default Re: Got some wheel questions? In here!!

    what offset and tire size?
    98 GTP-Mods? Yeah, lots of them
    2009 HEMI RAM- Mods are in the works!!

    01 Regal GS-SOLD :-(

  8. #8
    GTX Level Member Ridin ON Chrome's Avatar
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    Default Re: Got some wheel questions? In here!!

    9" is pushing it on these cars,, kinda have the right offset and tire size
    98 GTP-Mods? Yeah, lots of them
    2009 HEMI RAM- Mods are in the works!!

    01 Regal GS-SOLD :-(

  9. #9
    DUI BABY Bio248's Avatar
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    Default Re: Got some wheel questions? In here!!

    Quote Originally Posted by Ricky21 View Post
    i have 20X9 on mine and now wishing i didnt get em. i think they look good on it. they rub on the back tho when i hit bumps and there to heavy and im woried about my tranny
    any fender work done? id suggest rolling the rears to see how it works out.

  10. #10
    #Billsnamechangessuck MrPoopyButthole's Avatar
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    Default Re: Got some wheel questions? In here!!

    good write up

    its important to know that you can ride flush but you need be careful as rubbing can occur and its not a pretty site when it happens

    Cry havoc and let slip the dogs of war.
    2004 Saab 9-5 Aero - WAHSAABI - Way too much power/Koni FSD & Hirsch Springs/Big Sways - DD/AutoX'r
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    2015 Mitsubishi Outlander Sport SE - Wifey Mobile

  11. #11
    DUI BABY Bio248's Avatar
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    Default Re: Got some wheel questions? In here!!

    Quote Originally Posted by DrunkietheBear View Post
    good write up

    its important to know that you can ride flush but you need be careful as rubbing can occur and its not a pretty site when it happens
    thanks drunkie, ill add in your 'flush' measurements for the wheels sometime today.

  12. #12
    Administrator GeddyLee's Avatar
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    Default Re: Got some wheel questions? In here!!

    Finally stickied! Thanks for the great input Bio!

    James Shafer
    2003 GP GTX SLP P/N 50066 (SOLD )
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    1.9 Modified Rockers, TOGs, 180 Tstat, PRJ 10.4 Wires, P/P Gen 3, SLP Ram Air Hood/Wizaired CAI, Gen 1 Spoiler, 3.4 ZZP Pulley, Desert Fox Tranny Cooler, Thrasher Shift Kit, 18" TSW Mondellos w/ AGX Struts, SSC Gen II Springs

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  14. #14
    #Billsnamechangessuck MrPoopyButthole's Avatar
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    Default Re: Got some wheel questions? In here!!

    We should get all the Stock offset and wheel measurements in this thread too

    I have the 2004+ chrome torque stars (Known to peel and leak air)
    17 x 6.5 +52mm offset

    Cry havoc and let slip the dogs of war.
    2004 Saab 9-5 Aero - WAHSAABI - Way too much power/Koni FSD & Hirsch Springs/Big Sways - DD/AutoX'r
    2007 Ford F-150 Lariat - 5.4L V8 - Bill secretly likes it
    2015 Mitsubishi Outlander Sport SE - Wifey Mobile

  15. #15

  16. #16
    PittState Automotive Tech GAFF's Avatar
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    Default Re: Got some wheel questions? In here!!

    Bio u should create a thread about brake upgrades from other cars so we know what works and what doesn't. If you have the knowledge about brakes.
    SOLD 1999 GT Silvermist TS

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  18. #18
    PittState Automotive Tech GAFF's Avatar
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    Default Re: Got some wheel questions? In here!!

    Quote Originally Posted by Bio248 View Post
    dont know too much about it...
    Damn :/
    SOLD 1999 GT Silvermist TS

  19. #19
    #Billsnamechangessuck MrPoopyButthole's Avatar
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    Default Re: Got some wheel questions? In here!!

    Quote Originally Posted by Gafford44 View Post
    Bio u should create a thread about brake upgrades from other cars so we know what works and what doesn't. If you have the knowledge about brakes.
    I should maybe do that...I'm a suspension/brake guru.

    I'll get into it when I'm not lazy

    Cry havoc and let slip the dogs of war.
    2004 Saab 9-5 Aero - WAHSAABI - Way too much power/Koni FSD & Hirsch Springs/Big Sways - DD/AutoX'r
    2007 Ford F-150 Lariat - 5.4L V8 - Bill secretly likes it
    2015 Mitsubishi Outlander Sport SE - Wifey Mobile

  20. #20
    GTX Level Member imdaman3's Avatar
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    Default Re: Got some wheel questions? In here!!

    nice write up bio, now maybe ppl will use this. other then seeing the same posts everyday that ppl ask what size wheels will fit my car

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