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View Full Version : Do Vettes/F Bodys have same bolt pattern as a GTO



GTOGRRR
06-05-2005, 04:58 AM
Just wondering if vette and/or f body wheels will fit the GTO. I know the bp on the GTO is 5x120mm, but is that the same as 5x4.75? I just want to know what the biggest obstacle is in finding wheels, the goofy fwd offset or the metric bolt pattern.

Thanks

Jonathan

PS There is probably a post out there that I didn't find that addresses this so sorry for taking up server space!



Rob
06-05-2005, 05:20 AM
5x120 vs 5x120.65
WickedGoat
06-05-2005, 05:33 AM
In short- the Fbody wheels will fit, but not fit right. The lugs will not be completely centered in the lug holes, so you could see issues with vibration. The corvette rims are backspaced too much and have the came BP as the Fbody rims. Sorry.
craigffb
06-05-2005, 10:09 PM
DANG! I was hoping I could use one of the set of DRs I have for the Formula.
craigffb
06-06-2005, 04:25 PM
In short- the Fbody wheels will fit, but not fit right. The lugs will not be completely centered in the lug holes, so you could see issues with vibration. The corvette rims are backspaced too much and have the came BP as the Fbody rims. Sorry.

Are you sure? Look at this articel from GMHTP (http://gmhightechperformance.com/features/0507htp _slp/). The guys frrom SLP had a set of DRs on their 04 GTO at the strip.
miscreant
06-06-2005, 04:43 PM
Are you sure? Look at this articel from GMHTP (http://gmhightechperformance.com/features/0507htp _slp/). The guys frrom SLP had a set of DRs on their 04 GTO at the strip.
Doesn't surprise me. I argued with SLP for about 2 weeks via email that the GTO was not 5x4.75". They swore GM designed it around the F-body, as it was an "F-body replacement". Finally proved them wrong.

But either way, you "can" put a 5x120.65 on the GTO, if you bolt it down correctly, but you stand to get vibrations at some point, or even bend your lugs.
nikivee
06-06-2005, 05:14 PM
The will center correctly. The difference between 5x120 and 5x120.65 is the thickness of a piece of paper.
miscreant
06-06-2005, 05:23 PM
The will center correctly. The difference between 5x120 and 5x120.65 is the thickness of a piece of paper.
Poor analogy. So are you saying that 15 pieces of paper stacked up together is equal to 1 centimeter? I think FAR from it.
.:judge:
:mullet:
Fact is that .65mm when you are talking about rotating assembly bolt on locations becomes much more than that at rotational speeds at the outer rim. If you don't bolt a 5x4.75" wheel down correctly, you WILL get vibration, actually you'll get a thumping at speed. There's also been people who used 5x114.3 wheels on GM 5x115mm for racing or autocross that when they put their stock wheels back on, had vibrations and had to replace their lugs because they were bent. You just have to becareful.
nikivee
06-06-2005, 05:27 PM
The difference is 0.0235
miscreant
06-06-2005, 06:47 PM
The difference is 0.0235
If we were talking about stationary objects, that would not be a big deal. However, slight changes at the center of a rotating mass are amplified exponentially as you move away from the center.

Like you said, they will center, yes, IF bolted down correctly. If bolted down incorrectly, they will cause vibration (mainly because not only are they the wrong bolt pattern, they are also not hub-centric). However, depending on the thickness of the wheel mounting surface, you risk bending the lugs as well.

Can they be used, yes, with care. A good set of hub-centric rings would do wonders for staving off vibrations. But there are much better options - there are very cheap 17" BMW rims out there.
radandy
06-06-2005, 08:34 PM
couldn't you machine out (in) the 120.65's slightly, then apply even torqueing when installing them? just a random thought, as there's assloads of 5 x 4.75's out there...
miscreant
06-06-2005, 09:20 PM
couldn't you machine out (in) the 120.65's slightly, then apply even torqueing when installing them? just a random thought, as there's assloads of 5 x 4.75's out there...
Yes, I guess you could. But there's also a ton of 5x120mm BMW wheels out there, too. In fact, most 5x4.75" wheels do not have the right offset to fit in the front anyway. IMHO, it's just redundant to go that far...
radandy
06-06-2005, 09:25 PM
Yes, I guess you could. But there's also a ton of 5x120mm BMW wheels out there, too. In fact, most 5x4.75" wheels do not have the right offset to fit in the front anyway. IMHO, it's just redundant to go that far...

Oh, BTW your car is insane, over the top, everything my car aspires to be someday...PROPS!!! :D
Yeller Jakett
06-09-2005, 05:31 PM
couldn't you machine out (in) the 120.65's slightly, then apply even torqueing when installing them? just a random thought, as there's assloads of 5 x 4.75's out there...
A hubcentric centering ring "might" rectify the whole situation...