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Nov 17, 2013 | 07:16 PM

cool85

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wheels

I have a c4 but I have just purchased a set of c6 wheels 2- 19x10 and 2-18x8.5. are they a direct bolt on or is there something I have to do to make them fit?

Nov 17, 2013 | 07:21 PM

NuckinFutz93

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From: Murphy NC

Quote:

Originally Posted by cool85

I have a c4 but I have just purchased a set of c6 wheels 2- 19x10 and 2-18x8.5. are they a direct bolt on or is there something I have to do to make them fit?

Year will help us alot. If it is an 85 like your screen name, no, they are NOT a bolt on. You are going to need spacers.

Nov 17, 2013 | 08:08 PM

cool85

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yep it's an 85

Nov 17, 2013 | 08:45 PM

cool85

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what size spacers do I need, to go from stock 85 16" rims to stock 19 & 18" c6 rims

Nov 17, 2013 | 09:05 PM

NuckinFutz93

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From: Murphy NC

1 inch will work. They won't be exact, but they are close enough and easier to find than .8" spacers. You can get a full set for about 100.00 dollars on ebay.

Nov 17, 2013 | 09:23 PM

robbiehorn

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From: Axtell Texas

Quote:

Originally Posted by NuckinFutz93

1 inch will work. They won't be exact, but they are close enough and easier to find than .8" spacers. You can get a full set for about 100.00 dollars on ebay.

You talking spacers or adapters. I don't think the factory studs are long enough for 1" spacers. Adapters bolt to the existing studs and have another set of studs for the wheels.

Nov 17, 2013 | 09:34 PM

NuckinFutz93

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Joined: Sep 2012

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From: Murphy NC

Quote:

Originally Posted by robbiehorn

You talking spacers or adapters. I don't think the factory studs are long enough for 1" spacers. Adapters bolt to the existing studs and have another set of studs for the wheels.

Yes, I mis-worded it. You'll need adapters.

Nov 18, 2013 | 06:37 PM

rocco16

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Joined: Dec 2002

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From: SCMR Rat Pack'r Charter Member..Great Bend KS

If you have access to a press and the mechanical aptitude to do the job, it might be cost-effective and safer to run spacers with longer studs.
Jegs, Summit, etc. list extra-length studs.

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Nov 18, 2013 | 07:11 PM

c4cruiser

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From: Lacey WA RVN 68-69

NCM Sinkhole Donor

Quote:

Originally Posted by robbiehorn

You talking spacers or adapters. I don't think the factory studs are long enough for 1" spacers. Adapters bolt to the existing studs and have another set of studs for the wheels.

Good adapters should bolt on to the existing studs and with 1" adapters, the OEM stud should not protrude past the adapter's wheel mounting face. Test fit them to make sure the car stud won't go past the adapter face

You can use standard lug nuts and torque them to the OEM spec.

The bolt circle size for the C4, C5 and C6 will be 5x120.6mm so make sure you get adapters for that bolt circle.

Nov 18, 2013 | 08:43 PM

#10

YELLOW_95

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Joined: Nov 2013

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From: Desoto Texas

Quote:

Originally Posted by cool85

I have a c4 but I have just purchased a set of c6 wheels 2- 19x10 and 2-18x8.5. are they a direct bolt on or is there something I have to do to make them fit?

I had this same issue, the 18's fit the front with no problem but the rear had to have adapters

Nov 18, 2013 | 10:28 PM

#11

WVZR-1

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Joined: Sep 2003

Posts: 25,414

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Quote:

Originally Posted by cool85

I have a c4 but I have just purchased a set of c6 wheels 2- 19x10 and 2-18x8.5. are they a direct bolt on or is there something I have to do to make them fit?

I believe that the rears will require a different adapter/spacer than the front likely. On the wheels that you have bought there should be wheel information cast into the wheel stating offsets. You haven't mentioned if you've bought OEM/GM C6 wheels or replicas and "all are NOT created" equal. Tire/wheel fitments are done car by car with generic fitments tossed aside until you determine what you have.

I also believe that maybe a front of greater than 1" might be ideal. I did the math assuming to place the new tire/wheel in the same position as an early Z51 tire/wheel placement.

The offsets that you bought will determine what's needed. Post those numbers for more accurate information. Spend your adapter/spacer money just "once"!

Quote:

Originally Posted by YELLOW_95

I had this same issue, the 18's fit the front with no problem but the rear had to have adapters

Your experience with a '95 isn't to be compared with the OP's '85. Completely different wheel offset requirements are involved.

OP - you will need adapter/spacer X 4 it's just a matter of what's the best fit. Did you buy tires and wheels or just wheels?

Last edited by WVZR-1; Nov 20, 2013 at 04:43 AM.

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