#91665 - 05/24/07 12:18 PM
Tire and Rim Size
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Member
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Registered: 05/19/07
Posts: 1670
Loc: Indianapolis
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I am looking at some 18's for my GP GT and i was wondering, what tire and rim size should i get??? 225-40-18 235-40-18 245-40-18
What difference will it make if i get a wider or skinnier tire?
_________________________
 2000 GP GT 20's, altezzas, clears, F/M super 44's, some little blue L.E.D.s
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#91666 - 05/24/07 12:40 PM
Re: Tire and Rim Size
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Registered: 04/30/06
Posts: 3201
Loc: Groton, CT
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Get 245/45/18. Those are the closest size to stock for an 18" rim that will keep your speedometer and odometer as close to accurate as possible.
_________________________
 '97 SE with alot of mods
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#91667 - 05/24/07 02:17 PM
Re: Tire and Rim Size
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Registered: 12/29/05
Posts: 724
Loc: Dallas, Tx
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Originally posted by drummerboy1307:
Get 245/45/18. Those are the closest size to stock for an 18" rim that will keep your speedometer and odometer as close to accurate as possible. x2. Plus it will look a lot better, have more traction, etc.
_________________________
---Kevin 
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#91668 - 05/24/07 04:22 PM
Re: Tire and Rim Size
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Registered: 02/03/04
Posts: 1952
Loc: Mexico City
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I asked the same when buying and i think is the best size 245/45/18
_________________________
 ---------------------------------- My GP went away after more than 5 years of nice driving, good trips all along mexican territory, some mods, stories and headaches, I'm gonna miss it! ----------------------------------
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#91669 - 05/24/07 10:30 PM
Re: Tire and Rim Size
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Member
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Registered: 05/19/07
Posts: 1670
Loc: Indianapolis
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will it be any different if i get 245/40/18???
_________________________
2000 GP GT 20's, altezzas, clears, F/M super 44's, some little blue L.E.D.s
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#91670 - 05/24/07 11:27 PM
Re: Tire and Rim Size
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Member
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Registered: 02/03/04
Posts: 1952
Loc: Mexico City
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with 40's maybe you will need to lower the car a little cause any smaller than 45 leaves much space in the fender.
_________________________
---------------------------------- My GP went away after more than 5 years of nice driving, good trips all along mexican territory, some mods, stories and headaches, I'm gonna miss it! ----------------------------------
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#91671 - 05/25/07 12:20 AM
Re: Tire and Rim Size
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Member
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Registered: 05/19/07
Posts: 1670
Loc: Indianapolis
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ok so another question??? if i just buy the rim can i buy any 245/45/18 tires or do the rims have to be that size too???
_________________________
2000 GP GT 20's, altezzas, clears, F/M super 44's, some little blue L.E.D.s
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#91672 - 05/25/07 12:45 AM
Re: Tire and Rim Size
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Member
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Registered: 02/03/04
Posts: 1952
Loc: Mexico City
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Maybe you have to watch over the wide, but lets wait for the experts to answer on that.
In 245/45/18 the 18 is for the rim size.
_________________________
---------------------------------- My GP went away after more than 5 years of nice driving, good trips all along mexican territory, some mods, stories and headaches, I'm gonna miss it! ----------------------------------
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#91673 - 05/25/07 09:14 AM
Re: Tire and Rim Size
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Member
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Registered: 03/11/04
Posts: 5176
Loc: Virginia
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245 is your tire width in millimeters 45 is the aspect ratio...meaning your sidewall height is 45% of your width 18 is your rim diameter so to answer your question as long as you have an 18 inch rim the tires should work as long as your rim is wide enough to handle a tire that wide. Your stock GT rims are 16x7 ( 16 diameter x 7 wide) most aftermarket rims will be at least 7in wide while most will be 8in or wider. A 9 inch wide rim is the max size you can fit on a GP and that is plenty wide enough for 245 tire. As a matter of fact, 245/45/18s on 18x9 wheels is the exact setup I have on my car. My wheels are AFS mustang Bullitts (38mm offset, for 05-up Mustangs) and Riken Raptor tires (made by BF Goodrich)) the ride is quite a bit stiffer but the handling is great and I love the look. check it out... 
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#91674 - 05/25/07 12:08 PM
Re: Tire and Rim Size
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Member
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Registered: 12/01/04
Posts: 483
Loc: Colorado Springs
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Hey,I like those overlays. Where did you get them. And where do get the pontiac overlays. I was going to get the same set of rims, only in 17's and didn't know where to get the pontiac emblems for the rims
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#91675 - 05/25/07 12:43 PM
Re: Tire and Rim Size
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Member
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Registered: 03/11/04
Posts: 5176
Loc: Virginia
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I ordered the wheel centers from "Signs by Drex" who is now defunct I'm afraid...but I believe www.autobadges.com can hook you up with a set.
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#91676 - 05/25/07 06:00 PM
Re: Tire and Rim Size
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Member
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Registered: 05/23/03
Posts: 8078
Loc: Austin, TX
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Talia can hook you up with anything vinyl.
She's in the GPN Photo Album. You can shoot her a PM, or go over to CGP and PM her there.
I need to get her to make me some GRANDPRIX.NET decals.
_________________________
Bobby
Died 5/1/08, resurrected 5/15/08
ASCD SD hood, 17" Bullitts, Overkill PCM, 3.4" Pulley, NGK TR55IX, K&N 9" cone filter, JimmyC D/P, U-bend removed, Flowmaster 40 series, Hooker big bore tips with resonators, S/B brake lines, drilled/slot rotors, GMPP handling kit, KYB struts, F&R strut supports, HID's, LED's, 2.5" Air Dam, red GTP overlays on custom badges, white rear insert.
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