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What spacers will I need for C5 wheels onto C3 Vette?

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Old Feb 6, 2018 | 10:13 PM
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Default What spacers will I need for C5 wheels onto C3 Vette?

I have a '71 that I want to install some stock C5 wheels on. How or where can I find out what spacers am I going to need? Thanks
Old Feb 6, 2018 | 10:32 PM
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Default adapters

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Old Feb 7, 2018 | 10:46 AM
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about 4-5"
Of course that's not stock sizes, test fitting for 315/335 tires from
<< that car
Love the look of modern offsets on a c3 but don't think its practical



Last edited by JVetthead; Feb 7, 2018 at 10:58 AM.
Old Feb 7, 2018 | 10:54 AM
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Wow! Is this pic a joke or thatswhat I'll really need? Nevermind, just expanded pic closer from my cell and saw it was plywood, good one, lol

Last edited by sc2dave; Feb 7, 2018 at 10:58 AM.
Old Feb 7, 2018 | 12:32 PM
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I used 2 1/2 " on the rear of my 64 to put a set of thin spoke 8 1/2 " C-5 wheels on the back . Spacing worked out pretty well with the wider rear fenders. I put a bare wheel on a jack and rolled it in and out of the wheel well to figure out my spacing.
Old Feb 7, 2018 | 01:11 PM
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I use 3" adapter, but I am not sure if that is the correct size. I use the 3" adapters for everything from 16x9.5 to the 18x9.5 on my 73 and 76.

Vette Brake and products would be a good one to contact.

Last edited by vettehardt; Feb 7, 2018 at 01:12 PM.
Old Feb 7, 2018 | 01:53 PM
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Will spacers pass tech for 1/4 or safe for road courses?
Anyone seen failures? Curious
Old Feb 7, 2018 | 08:44 PM
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Originally Posted by cuisinartvette
Will spacers pass tech for 1/4 or safe for road courses?
Anyone seen failures? Curious
spacers will pass, up to what thickness I don't know.
I would think not with an adapter, I could never use one.
Just mocking up for back space and flare fitment with the
Fred Flintstone adapters...
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Old Feb 7, 2018 | 10:25 PM
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BeeJay runs adapters on his radical 79 road racer.
Old Feb 8, 2018 | 04:15 PM
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2.5" con-centric" adapters with C4 wheels, probable need 3" for C5.
if your gonna run adapters only use concentric adapters.
you will need to measure wheel backspace to determine exact fit.




Last edited by 69Vett; Feb 8, 2018 at 04:17 PM.
Old Feb 8, 2018 | 05:08 PM
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Originally Posted by cuisinartvette
Will spacers pass tech for 1/4 or safe for road courses?
Anyone seen failures? Curious
Spacers it depends on how long your lugs are. You still need to have enough of the lug nut threaded onto the lug to be safe.

Adapters are different it that they bolt onto the original lugs and then have new lugs to fit the wheel onto. They can be as wide as needed.

I've been running the same set of 3" adapters on my 73 and 76 for close to 17 years now. My dad first put them on my(then his) 73 back around 97-98. We ran them for many years of just autocross use. I bought my 76 in 2006 and have swapped the adapters between the 73 and 76 many times depending on which car I was taking to the autocross. The motor blew up in the 73 around 2009. Since then the adapters have stayed on the 76.

I am just now beginning to get a little play in the bearings in the front of the 76. It may be as simple as tightening them up a bit. I will be looking into this in the spring when it gets warmer.

If you torque the adapters onto the car correctly, then there won't be an issue with them coming off.
Old Feb 8, 2018 | 06:42 PM
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Here's a couple pictures of wheels on my cars:

76 with 16x9.5 C4 wheels



76 with 17x8.5 C5 wheels all the way around


73 with 16x9.5 C4 Wheels


76 with 17x8.5 front and 18x9.5 rear C5 wheels. I remembered i had to add a 1/4" spacer on top of the 3" adatpers to get the rears to fit.


I don't' have a picture of the 73 when i ran 17x9.5 C4 sawblades on it. I can't run them on the 76 until i relocate the parking brake bracket.
Old Feb 8, 2018 | 06:46 PM
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Here is a picture of the adapters on the front of the car. These are VBP adapters that are hub-centric. This is from when i was installing the hookers.
Old Feb 9, 2018 | 11:21 PM
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You should just flip the center section on those CCW wheels and you probably wouldn’t need any spacers...



Originally Posted by JVetthead
about 4-5"
Of course that's not stock sizes, test fitting for 315/335 tires from
<< that car
Love the look of modern offsets on a c3 but don't think its practical


Old Feb 10, 2018 | 08:44 AM
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I'm running c5z06 wheels on 3" w/18x9.5 on front ands 2.5" on rear w/18x10.5 on the rear. Ebrake cable relocated.
Old Oct 30, 2021 | 10:03 PM
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Default Spacer/adapter calculator and C3/C4/C5/C6 wheel and tire tech sheets

For folks looking to fit various C4/C5/C6 wheels on your C3, I have found this calculator to be very handy.

It only goes up to 2" spacers/adapters but you can add half an inch or an inch to the output manually to find values for 2.5" and 3" spacers.Also, invaluable for determining fit is identifying the stock wheel offset and tire size, which is different between generations, Z06 versus base model, etc.Found the notes in this thread and these sites very helpful in fitting C6 rims on my 1980.

Last edited by KevinHVettes; Oct 30, 2021 at 10:04 PM.

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