C5 rims on a C4
4th Gear
Joined: May 2008
Posts: 4
Likes: 0
From: Calgary
My understanding is that the 1984-87 had a 34mm offset while 1988 on has a 56mm offset, meaning a later wheel will ‘sit under’ the car about ¾ inch more. 1984-87 originally used tire size 255/50 VR16 so, if we went with a 3/4 adapter it should work for the C5 rims and tires 245/45/17 F & 275/40/18 R ?
I was also told, please confirm if true that the adapters only work with the original factory wheels up to 1996, 88-96 wheels on the back side have an inset in the hole where the stud comes through making the adapters fit flush.
This is why 88-96 wheels will work and the 1997 and later wheels do not, so the wheel will not fit flush and mount up, the wheel hits the lug nut on the adapter and will not mount??? Again if some can please confirm. Thanks in advance for any guidance that can be provided.
I was also told, please confirm if true that the adapters only work with the original factory wheels up to 1996, 88-96 wheels on the back side have an inset in the hole where the stud comes through making the adapters fit flush.
This is why 88-96 wheels will work and the 1997 and later wheels do not, so the wheel will not fit flush and mount up, the wheel hits the lug nut on the adapter and will not mount??? Again if some can please confirm. Thanks in advance for any guidance that can be provided.
Le Mans Master
Joined: May 2006
Posts: 9,226
Likes: 9
From: Irvine Ca
I did read that, but it was too simple. I was looking for a bit more.
I mean, even without the spacer/adaptor, the stress is all upon 5 studs.
Sure, the stress is spread when the Hub and wheel are pressed together....but how is that changed by adding a little meat in between
I'm not arguing... I'm interested in hearing the logic behind the subject for both sides...
Thanks
I mean, even without the spacer/adaptor, the stress is all upon 5 studs.
Sure, the stress is spread when the Hub and wheel are pressed together....but how is that changed by adding a little meat in between
I'm not arguing... I'm interested in hearing the logic behind the subject for both sides...
Thanks
Last edited by jhammons01; Dec 4, 2009 at 01:09 PM.
Safety Car
Joined: Jul 2003
Posts: 4,928
Likes: 1
IMHO, the spacer and longer studs is the stronger and better way to go.
Le Mans Master
Joined: May 2006
Posts: 9,226
Likes: 9
From: Irvine Ca
Melting Slicks
Joined: Feb 2006
Posts: 2,753
Likes: 15
From: backwoods upstate ny
no theories just experience
back/day i ran some 3/8'' spacers on a new caprice, street driven (ok, slightly enthusiastic street)...'custom' wheels 'just' argued a bit with casting lumps on the calipers, didn't want possible warranty grief of caliper 'mods"...shortly (couple weeks IIRC) after install, began to 'loose' one or two studs/lugnuts EVERY WEEK...tossed the spacers and cleaned up (messed up) the calipers with a grinder = end of saturday morning stud repair sessions.
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