Curious if anyone is running C5 magnesium wheels.
I picked up a set of 6.
So I have the standard 17/18 and also two additional 18.

I intend to run the 18 on all four corners but noticed that the 18 on the front will rub on the inner fender closest to the firewall.
Curious to know if anyone ran into this and did you solve it by running a space and longer lug studs?
Or did you do something else.

 

What year C4? All 6 of your wheels share similar casting information on the back-side confirming they're genuine?

 

going on a 90.

yes the mag set are all genuine GM.

 

The 18" should be @65mm offset so to match the '90 which is @56mm you'd need 9mm but that would be a difficult find I'd think so maybe you just move to .5" easier to find or shop 10 or 12mm for Metric. I doubt that you could use that spec spacer without changing wheel studs but only a trial fit would answer that.

 

thank you.

 

I am running a square set of C5 Magnesium made in Italy N73 option 18x9.5" 65mm offset all four corners with 275/35R18 Kumho V730 tires on my 1989.

I am using very long ARP wheel studs, a 20mm spacer in the front and a 32mm spacer in the rear. Actually they were wheel adapters that I knocked the studs out of to run as spacers.

Hubcentric with correct 70.3mm centerbores. Test fit on my hubs and on the wheels using the paper test to ensure good tight FLAT fit.

These spacers bring the 65mm C5 magnesium wheel offset to a net offset of 45mm front and 33mm rear.

Fitment is decent. I have like 3 degrees of negative rear camber on this car so these skinny tires and wheels still tuck under the fenders. My front camber is unfortunately weak at like 0.8 degrees negative so there is some poke up front.

88-96 base came with 56mm net offset factory wheels 17x9.5" sizes for most years. This means to get factory fitment, you just need a 9mm or more likely a 10mm spacer.

Lots of aftermarket A Mold wheels for 88-96 cars are 17x9.5" 50mm offset. To match that, you just need a 15mm spacer.

ZR1 cars had 17x11 36mm offset rear wheels, so presumably it is safe on the rear wheel bearings and hubs to load them with a 36mm net offset wheel.

 

Yakmaster...you wouldn't happen to still have those old studs out of those adapters and want to sell them would you? I have a couple that broke in my adapters. I think they're the same size. I saved the adapters but cannot, for the life of me, find that length of stud to replace them

 

Sorry man I threw them in the recycling... I was starting to accumulate a LOT of wheel studs as I was swapping the hub wheel studs to the ARPs as well.

I am likely going to buy another set of adapters to turn into spacers, and when I do and knock the shorty studs out, I will let you know!

 

You should only have to take one of your old studs to a very good 'local' auto parts store to match after confirming with a Vernier caliper the diameter of the knurled area, length of the knurled area and the total under-head length. I'd suggest NAPA and even if they didn't have you could probably have the next day with no shipping. Dorman has very good wheel stud information after you have dimensions. If you're attempting to replace studs in the adapters you need to maybe consider pinning them so that they don't spin in the future OR maybe just drill and pin yours if you've not destroyed the threads.

 

I took one in to advance and autozone and they could not find a match. A couple that were close but not the same so i just gave up as I have 2 spare adapters anyways but I saved the old one just incase I could find the correct stud some day. Thanks for the info

 

Definately shoot me a message when you do. Thanks

 

Let me check my stash. I believe I saved them from my adapters.

 

Oh sweet

 

pm sent

 

@tuneportbeast I also suggested measuring with a Vernier before reaching out. I would think you could 'help yourself'!

If your issue is spinning studs in the adapter then you could use what you still have I'd think by just pinning them so they can't spin. We've pinned a few sets for a local fellow. It's a nuisance but it works. We drilled and pinned from the outer diameter through the stud. I thought this AM about an alternative maybe, notch the stud head @ 12:00, 4:00 and 8:00 then drill the adapter at the same locations and pin it in that fashion.

 

One or two of them sheared right off after a few years of use. My friend had the same issue with a set of his adapters

 

I have these (factory optioned) magnesium wheels on my 2001. No complaints.

 

I ran them on a C5. Just a word of caution in that they chip very easily. So take care with them especially during mounting tires.

Good luck.

 

Thank you. I should have been a little more specific, lol. Anyone running these on a C4. Specifically 88-96 C4.