I thought about getting the GTX01 wheels that are in the link below(they are the first ones).I really like the deep dish wheel look and would like to go as deep as possible on them.I'd like to get the Fikse FM/5(Berger SS) but cannot afford them but I love the look they give.Thats kinda what i'm shooting for.Can these wheels be more deeper?I'm very unfamiliar with wheels.Thats the reason for the dumb questions.

http://www.billetspecialties.com/pro...cid=16&scid=18

I was thinking of going with 17x11" on the back and 17x9.5" on the front.I've been told their may have to be a little modifcation to the wheel well with the 11" but if thats all then I can handle that..Would you guys agree on those sizes?
Again i'm an amateur at wheels so feel free to correct me and give suggestions.
Thanks,
JE

 

Their 17x11 can be had in a 7.75" backspace, and that would put the outer edge of the tire just barely under the edge of the rear fender. You can see a 17x11 7.75" BS TT II in this picture.

http://www.kellydrown.com/showcase/120-2036_crw_std.jpg

The problem with using a "deep dish" wheel is that this reduces "backspace" 1-for-1..... make the dish 1" deeper, and you have 1" less backspace. Any less backspace than 7.75" and you will have the tire outside the fender. The alternative would be using the rear axle assembly from a 3rd Gen, which is 3" narrrower than a 4th Gen. That would allow you to add 1.5" of "dish" to the wheel for a deeper look. Not sure how the 4th Gen disc brakes would attach to the 3rd Gen axle. And ABS could be a problem. And, you would have a much deeper look in the back than you would in the front. Depends on what "look" you want.

Another alternative would be to have a body shop tastefully flare the fenders, to allow the wheel/tire to stick out a little more.

Your size choices are fine. But you have to consider "backspace" when you select the actual wheel. Not ALL cars need the hammering in the back to fit 11" wide wheels... with the 7.75" backspace, you would more likely have to roll the sharp edge of the fender opening "lip" up a little, so it wouldn't rub on the outside edge of the tire.

 

Thanks man I appreciate the info.So basically 7.75 backspace is the max right?I just want it to be as deep as possible without it sticking out past the fender regardless of how little the deepeness.If that is the max then thats what i'm lookin for.
I have the Moser 9",is their any easy modifcations I could do to this rear to get any deeper without being to pricey?
One more question,what are the tire sizes available for the 11' rim?I'm sure i'll go with the 315's but I don't want them to rub on anything so what are the chances of them rubbing?This may be a dumb question but can you put a 275 tire on 11" rims?Reason i'm asking is because I may go ahead and get the rims and put my 275 tires on them until I got the money for the tires.
Thanks again,
JE

 

When using 11" rims, the min is 7.75" Backspace. My ZR1's have 8" BS.

You have NO other choice than the two above dimensions. Don't care how much you want a deep dish. The 9" should be about same Overall dimension width as stocker,,, but don't really know.

I can tell you that I'm one who had to beat mucho tin to make my 315's fit good. (But actually, I plan to shove some 335's under there upon next tire phase.)

I even relocated the snubber from axle to the LCA.

don't do the 275's on 11"s cause it looks ricy.

 

let me know what price they give you for the wheels. I am a distributor for Billet Specialties....I may be able to get you a better deal.

 

I'd like to be able to better understand backspace and offsets.If I were to try and measure the backsapce and offset how would I go about it?I'm terribly afraid that I will place an order on the wheels only to be dissapointed.
Sorry to keep bugging you guys with these kinda of questions,i'm just kinda lost on this.
Thanks again,
James

 

The wheel width (example: 17 x 11) is the distance between the points where the tire bead seats on the rim. Essentially, an 11" wide wheel is 11" wide INSIDE the flanges that hold the tire on the rim. The overall width would be 11" plus the width of the two flanges.... so an 11" wide wheel will actually measure closer to 12" wide, when you measure from the front to the rear.

Offset is the distance that the hub mounting face of the wheel is "offset" from the centerline of the wheel. Let's stick with our 17x11 wheel, that actually measures about 12" wide. If the offset is 50mm (let's round that off to 2"), the centerline of the wheel is 2 inches deeper in the wheel well than the mounting face of the axle flange. This wheel would have a 8" backspace (12"/2 centerline + 2 offset) = (6 + 2) = 8".

If you want to measure backspace, you put a straight-edge flat across the back of the wheel, and measure at the center of the wheel the distance from the straight-edge to the flat surface of the wheel that mounts against the axle flange.

Tire Rack has some decent diagrams showing all this.

If you make the rear axle wider, the offset has to increase. Make the axle 1" wider on each end, and you need a wheel with 1" offset to keep it in the same spot under the fender line.

In the old days.... (= 3rd Gen F-Body), the front suspension and the rear axle width was designed so that the wheel would pretty much have "0" offset.... that is, the mounting surface of the axle flange would be right over the centerline of the wheel. An 8" wide wheel (measures 9" on the outside) would have a backspace of 4.5" (9 / 2). But there was a problem fitting the drivetrain behind the wheel on front wheel drive cars, so they started pushing the mounting surface of the wheel out-ward to make more room for the CV joints and such, resulting in a large offset, a large backspace, and very little in the way of "dish" to the wheels. Not sure why GM felt obligated to adapt the front wheel drive strategy to the 4th Gen, but they've done it on the Corvette and other rear wheel drive cars, resulting in wheels that look "flat", and lack the deep dish look of the older muscle cars.

You can't do anything with your Moser 9-inch, other than have it "narrowed".... or you could have just bought it with 3rd Gen dimensions. Narrowing a rear might get pricey.... I'm sure Moser could quote you a figure.

 

What is the offset with a 7.75" backspace on a 11" rim?Just like to know for the sake of knowing it.
Thanks,
JE

 

It depends to some extent on the width of the tire bead retaining flanges. But I believe the TT II 7.75" backspace wheels have a 45mm offset. You might want to check that with ARE. The AFS ZR1/GS offset replicas are quoted by AFS as having a 7.93" backspace, and a 50mm offset.

 

Maybe you can help me Injuneer.I'm thinking of getting a set of wheels that they have to custom make for my car and they need to know what offset I want.Should I just tell them I want a 7.75" backspace and let them figure out the offset?
Thanks for all your help.
James

 

Sure. They can figure it out better than you can. Its going to be in the range of 44-46mm.