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42mm offset on 8" rim??

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Old 02-09-2012 | 05:04 PM
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42mm offset on 8" rim??

I tried to find out myself whether these would fit, but I had a hard time getting a definite answer. There is a set of BMW rims that I am interested in buying. They are 18 x 8 with a 42mm offset. Will these fit??

Thanks in advance, Peter
Old 02-09-2012 | 06:07 PM
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//<86TA>\\'s Avatar
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Re: 42mm offset on 8" rim??

you will need a 42mm bolt on adapter, +/- a couple mm (1 5/8" is about it, if you can find it), and preferably one that will convert the bolt pattern from the 5x120 the bmw uses to the 120.65 the 3rd gen uses.
Old 02-09-2012 | 06:21 PM
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Re: 42mm offset on 8" rim??

So would a 1.5" spacer be fine for that?
Old 02-09-2012 | 06:22 PM
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Re: 42mm offset on 8" rim??

The 120.65 bolt circle is fine, that's just .325mm off per stud, not a problem. I have bimmer wheels on multiple chevies, driven for years without probs. Just use the correct hubcentric rings
Old 02-09-2012 | 06:24 PM
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Re: 42mm offset on 8" rim??

Originally Posted by asdfg68plus1
So would a 1.5" spacer be fine for that?
should be ok, yes
Old 02-09-2012 | 06:25 PM
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Re: 42mm offset on 8" rim??

120 and 120.65 are the same bolt pattern, you will need spacers much like running 4th gen rims or vette rims but the pattern is the same if it is in fact a 120.65 on the BMW.
Old 02-09-2012 | 06:25 PM
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Re: 42mm offset on 8" rim??

Originally Posted by Twin_Turbo
The 120.65 bolt circle is fine, that's just .325mm off per stud, not a problem. I have bimmer wheels on multiple chevies, driven for years without probs. Just use the correct hubcentric rings
true, it "works" people do it. Its just not something i would do personally.
Old 02-09-2012 | 06:26 PM
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Re: 42mm offset on 8" rim??

Originally Posted by 90 camaro cj
120 and 120.65 are the same bolt pattern, .
they are? those numbers look different to me.... must be this new fangled math they teach people these days....
Old 02-09-2012 | 06:34 PM
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Re: 42mm offset on 8" rim??

.65 mm is so little that yes they are the same less then .5% difference between the two
Old 02-09-2012 | 06:35 PM
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//<86TA>\\'s Avatar
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From: Central NJ
Car: 86 Trans Am, 92 Firebird
Engine: 408 sbc, 3.1L of raw power
Transmission: TKO600, T5
Axle/Gears: Moser 9", 3:70 trutac, 3:23 torsion
Re: 42mm offset on 8" rim??

Originally Posted by 90 camaro cj
you said the BMW has 120.65mm bolt pattern. convert 4.75 inches (our bolt pattern) to mm. you get 120.65mm
no i didnt, look at my post. the bmw has a 5x120, chevy has 5x120.65

Originally Posted by //<86TA>\\
you will need a 42mm bolt on adapter, +/- a couple mm (1 5/8" is about it, if you can find it), and preferably one that will convert the bolt pattern from the 5x120 the bmw uses to the 120.65 the 3rd gen uses.
Old 02-10-2012 | 04:56 PM
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Transmission: T5, 700R4, T5, 700R4
Axle/Gears: 3.08, 3.27, 3.45, 3.27
Re: 42mm offset on 8" rim??

IMO years of experience outweighs an opinion, not that your opinion doesn't matter but if it was a prob I'm sure I would have had a failure. This includes WOT runs down the german autobahn and driving like an idiot
Old 02-10-2012 | 05:21 PM
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Car: 86 Trans Am, 92 Firebird
Engine: 408 sbc, 3.1L of raw power
Transmission: TKO600, T5
Axle/Gears: Moser 9", 3:70 trutac, 3:23 torsion
Re: 42mm offset on 8" rim??

That's fine and I understand, not trying to argue here, just stating facts incase the OP did not know the difference in the pattern. However, like I said, this is something I would not do on my own car, nor would I tell sombody else that its perfectly ok without mentioning the difference because if something did happen I would not want that on my hands. Its just the way I am.

I know people use this pattern and I have not seen a failure first hand, but that doesn't mean the possibility is not there, especially for someone who is uninformed and installes a wheel like this without a hubcentric adapter, since without, the wheel can be pulled way off center if all the lugs are not evenly and gradually tightened.

I hope you see my point here and that I'm not trying to be difficult, just providing the needed information.
Originally Posted by Twin_Turbo
IMO years of experience outweighs an opinion, not that your opinion doesn't matter but if it was a prob I'm sure I would have had a failure. This includes WOT runs down the german autobahn and driving like an idiot
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