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c7 wheels on c5

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Old Dec 25, 2020 | 08:33 AM
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Default c7 wheels on c5


Will these fit my car (99 vert)? they are 18x8.5 in front and 19x10 rears. I guess my main concern is offset of the rears. I've tried finding that info, but so far, unsuccessfully.
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Old Dec 25, 2020 | 12:16 PM
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ok, I think i've confirmed that the offset for these c7 rears is 79. my current is 57, i think (stock chrome wagon wheels).

Using the wheel calculator found on a website (not sure which) its say i need 16mm spacer (5/8")

So, based on that i think i'm ok. Will i need longer lug bolts? and how are they installed? (press fit?)
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Old Dec 25, 2020 | 12:52 PM
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I used 20mm hub centric adapters with those offsets and it's a perfect fit. I was able to use the adapter without cutting the ends of the studs off because the rim had an indent that allowed them to fit. if not you have to trim the studs. You could use longer studs with a spacer but they are a pain to install.
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Old Dec 25, 2020 | 07:57 PM
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I have those wheels. Used 3/4” spacer on the rear and trimmed the lugs.
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Old Dec 27, 2020 | 10:10 AM
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Well, I bought those c7 wheels. Now I need a 20mm hub centric adapter for the rear. (if this is the wrong term, sorry) Looking for a quality one, already painted black. Also, are center caps a generic size?
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Old Dec 27, 2020 | 12:28 PM
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Old Dec 27, 2020 | 01:06 PM
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Originally Posted by rockymountain1999

I have those wheels. Used 3/4” spacer on the rear and trimmed the lugs.

That looks fantastic. I could see going down this road someday!

Nicely done.
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Old Dec 27, 2020 | 01:08 PM
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Dumb question, is that particular C7 wheel prone to the cracking issues that have plagued the C7?
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Old Dec 27, 2020 | 01:33 PM
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Well I’m not sure. I haven’t heard of that issue!
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Old Dec 27, 2020 | 01:49 PM
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20mm (3/4”) should be correct. Have the standard 18,19 wheels on my 99.


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Old Dec 27, 2020 | 02:01 PM
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Be safe, be aware, get your money back.

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Old Dec 27, 2020 | 02:28 PM
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Originally Posted by rockymountain1999
Well I’m not sure. I haven’t heard of that issue!
Well i wasn't aware of c7 wheel cracking issue til now. Of course i've become aware after i already made purchase. However, just looked thru c7 forums, and i could be wrong, but it seems to be issue with the wheels on c7z and GS.

Last edited by djohn3853; Dec 27, 2020 at 02:30 PM.
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Old Dec 27, 2020 | 02:31 PM
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Originally Posted by Mr. Black
Dumb question, is that particular C7 wheel prone to the cracking issues that have plagued the C7?
It's only the widebody wheels that are prone to cracking/bending. The narrow variants are good to go.
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Old Dec 27, 2020 | 05:04 PM
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Originally Posted by Verrückt ZR1
It's only the widebody wheels that are prone to cracking/bending. The narrow variants are good to go.
And those wheels would be fine if you don't use runflat tires. As already mentioned, the base C7 wheels are thicker and haven't had any cracking issues.

Runflat tires have a very stiff sidewall, that can contribute to cracked wheels.
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Old Dec 27, 2020 | 05:44 PM
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Originally Posted by USAZR1
And those wheels would be fine if you don't use runflat tires. As already mentioned, the base C7 wheels are thicker and haven't had any cracking issues.

Runflat tires have a very stiff sidewall, that can contribute to cracked wheels.
Well, i'm in the market for tires, but don't plan on getting run flats.
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Old Dec 27, 2020 | 07:30 PM
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Thanks for the good information fellas on the widebody wheels.

Apologize djohn for setting off a mini panic. Was not my intention.
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Old Jan 12, 2021 | 04:36 PM
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I've got the new wheels on now. Havent driven it though (cars put away for the winter) Car looks very 4x4 right now, hasn't settled down after jacking each corner up. Put my big boy pants on and trimmed the wheel lugs.





Had trouble updoading the pics

Last edited by djohn3853; Jan 12, 2021 at 05:03 PM. Reason: Add pics
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Old Jan 12, 2021 | 04:46 PM
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Rule #1: It didn’t happen unless proven with photos.
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Old Jan 12, 2021 | 05:47 PM
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Dave, those C7 wheels look really good on your Vert.
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Old Jan 12, 2021 | 05:55 PM
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Yep those look good!
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