My vote goes to silver TQ stars. By far the best looking rim on a GP. Polished 5 stars if you've got a red one come in a close 2nd.

20's, yikes....

Hey guys...does the 18's closes some of that gap above the tires, to avoid that 4x4 look...or, is it a Fact, that the Only way to get rid of that look, is by lowering the GP?

And, is it Necessary to make ANY other Mods To the Suspension, if One upgrade to 18's?

I'm looking to get these next year:

http://cgi.ebay.com/ebaymotors/AFS-05-07...emZ230160258164

with these:

http://www.graphicsbyid.com/?p=productsMore&iProduct=31&sName=Arrowhead-Center-Cap-Overlays

and a set of f-body calipers and 12" rotors

18s fit with no issues as long as you stick to the proper offset window (35 to 45)...245/45/18 is the max tire size you can go although I believe we do have one member running 255s but I dont know if he has any clearance problems.
Even with the 18s, the 245/45 tire is almost the same diameter as you stock 225/60/16 so the wheel gap issue will remain. I believe AustinGTP is running 235/55/17s on his and the stock ride height looks good, but that is a taller than stock tire but fits with no issues I'm sure.

**** Urgent Reply Needed ****

Hey SlickGTP or Any of the Wheel/Tire Expert here...can You tell Me, if I could fit some 255/40/18 mounted on some 18x8 under the Fender without any problem?

I just bought these Beautiful Black Sacchi's and a Friend offer to sell Me some 255/40/18...that He claims will fit Fine, in the rear. You said that the 255/45/17 fit, but will His 255/40/18 Fit the GP? He has a Buyer...but, He is Hoping to save Them for Me.

Can Anyone Help Me Decide?

With a 38mm offset and 245/45/18 I had like 1-2mm clearance on the inside rear. I personally don't think you will get the to fit without rubbing unless the offset is more (or less depending on how the offset number works)

RD: Depends on the offset of the wheel and if you have the car lowered, etc. Need more details before I can give you a good opinion.

no bigger than 18. your trans will thank you in the future.
as for me i have 17" bullits with 275/45/17s on them with stock suspension and no clearance problems at all, also give my car one hell of a mean stance.

Hey Guys the wheels are 18x8 & the Dealers Insist that they will definitely fit the GP...so, I am Imagining that the Off-set is in the Vecinity 38.

Now, I wouldn't have even Imagine...that a 275 would fit under the Fender without Rubbing on Something, with the wheel being 17, 18, or Other.

So, if I Understand this Correctly...if a 275/45 fits the GP with a 17"...then a 255/40 should fit Fine, with a 18" Wheel if the Off-set is some what Close to 38?

Is that more or, Less...the way it Works?

How in the h-ll did you get those to fit??? I thought that even for 255's you had to roll the fenders. Seems like you'd be rubbing your strut assembly with a tire that wide

nope, no problems at all.

Hey JPGP...Those are some Beautiful Wheels! Are You planning on replacing the Center Cap for some Pontiac's?

My GTP is Grey, so I prefer the Black Wheels...I Think they really match the "Gray Iridescent" original Paint & I am Not into the Chrome look.

But, I just wanted to say "Thanks" to You Guys. You have All been Great...in Helping Me decide. But, since the Summer is all over, I Think I will get the 255/40/18 Tires for the rear(just for that Great Look & Stability)...& I will stick to 235's or 245's for the Front, & wait for next Spring to put them All on.

And, even if some of You are Wrong about the Fitment, it's Ok! You have still Offered Lots of Help...& I Really Appreciate it.

Once I get My Baby, all together...I will Post some pics, to show off "Your Suggestions".

"Yours", because...I would still be running around, & Wondering what fits & what doesn't, & also Buying & paying $$$$ to return Item that just didn't Fit.

Hope I can Help in some way, sometime...