geo1400

Hi guys,

I've been toying around this idea for ages and need to clarify a couple points before I buy.

I have replica Lumina SS wheels and they had to be machined slightly to fit over the hub. As a result, never really fitted properly and i'm afraid they are starting to cause problems.

I want to erradicate the problem by fitting spacers and hub centric rings, so here's my question; if I put let's say a 0.125" at front and 0.500" spacers (not adaptor) at back, how will that affect the lug nuts? Because you can't just buy longer bolts like other cars?

Any help appreciated.

Injuneer

These are wheels for a Lumina SS, installed on a Lumina SS? Or are they installed on some kind of Camaro?

geo1400

Oops... I forgot my car isn't in my signature... It's a '98 Camaro Z28!

Injuneer

The Lumina has a 5 x 115mm bolt circle. The Camaro has a 5 x 4.75" (120.65mm) bolt circle. How did you bolt them on the car? If you didn't use a 115mm --> 4.75" adapter, it would explain why you are having problems.

And how wide are Lumina wheels? Are they even as wide as the stock 16 x 8.0" Camaro wheels?

You don't have a signature for it to be in. Why not add one?

geo1400

I've been using ls1tech more often to be honest, great info on that site but I find people respond faster here??

I think we might be getting our wires crossed somewhere, I should probably mention I'm in the middle east, where the lumina is a Holden commodor?
Or you might know it as the pontiac gto?

Anyway, bolt pattern is the same as my camaro so they fit there, I have 245/40 r18 tires fitted all round and I think the rims are 8.5 wide. The problem I think I'm getting is the center hole on the rim is not sitting over the hub 'lip', mainly due to the fact that hole had to be made wider to fit, and I think it just wasn't machined properly.

That make more sense?

Injuneer

I have to admit - I am not aware that the Lumina name is used on the Holden in the mid-East. Dumb me.

The Holden/GTO has a 120mm bolt circle. Again, that is not the correct size for a 4th Gen F-Body. Small difference, but significant. This issue gets debated often. What kind of "problems" are you having?

1/2 the people that put the incorrect 120mm wheels on their 4th Gens claim they have no problems at all. The other 1/2 claim they have problems like broken studs and loose lug nuts.

In my opinion, it's a mistake to put the incorrect wheels on the car.... but it's your choice which side of the debate you choose to accept.

The 4th Gen wheels are not centered by the hubs (hub-centric). They are centered by the conical lug nuts fitting into the matching tapered holes in the wheels (lug-centric). That's why you don't want to put 120mm wheels over 120.65mm studs.

Additionally, you seem to feel the studs can not be replaced with longer studs in order to use spacers. That is incorrect. The studs are a press-fit into the hubs, and can be removed and replaced. But maybe in the mid-east the 4th Gen F-Bodys are different too.

geo1400

Brilliant info thanks. So am I right in assuming that the .65mm difference is the same reason people have problems fitting bmw wheels onto 4th gens? I've read about that.

I thought I read somewhere that 4th gens were hub centric, didn't really know how that worked but now I understand. As for ME camaro's, mine is built in Canada and imported here from Japan, so *** specs.

I'm going to have a real problem finding wheels or a solution over here. I'm going to start by measuring the bolt pattern on my wheels, where would I do that from to find the 120mm figure? If the bolt pattern I have is correct, then I know the problem will lie in the center hub hole.

Thanks again!

69z-28

they are definitely hub centric...

geo1400

That's what I thought!

Injuneer

How can they possibly be "hubcentric"? the 93 through 96 4th Gens had two different hub diameters. The rear axle hubs are about 0.030" larger than the front hubs. All 4 wheels have the same hub hole diameter. The difference in hub diameters was not corrected until some point in the 97 model year, when the rear axle hub diameter was reduced to match the front hub diameter.