A lot of SHOCK value though. 
largest wheel/tire combo on a C3
Race Director
Joined: Jan 2007
Posts: 14,959
Likes: 3,353
From: NYC NY
Do a search in this forum and the the general C3 forum using "18s" there is hours of reading. It depends on what diameter wheels you want to use and how much you want to mod to get them on. What seems to "bolt on" with no drama is a 17 or 18 by 8 in the front with a 4" backspace and a 245/45 tire. In the rear a 18x9.5 with a 5" backspace and a 275/40-18 tire. Now there are many other combinations that will work and you need to be more specific on what you are looking for (15s - 17s - 18s - ect - ???) to get a more direct answer.
Race Director
Joined: Jan 2007
Posts: 14,959
Likes: 3,353
From: NYC NY
Here's what one forum member did to get 18x10.5s with 295/35s on. http://forums.corvetteforum.com/c3-t...clearance.html
It's a lot of work but the results speak for themselves.
http://forums.corvetteforum.com/c3-t...ls-are-on.html
That's a great result but do you want to go that far? You can get a 18x10 with a 5.5 backspace with a 275/40 tire with a lot less work and expense. Something to think about though.
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Advanced
Joined: Sep 2006
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Stock... No
your stock brake calipers will probably not clear the wheel
your stock brake calipers will probably not clear the wheel
In crawling under the car while on stands, it looked like the potential issue would be the inner back side of the tire at lock. However, in reality, I'm not sure the back inside edge would really be much further in since I'll be using a 245/45 --- and my test was with a 255/60 on a 15"
Drifting
Joined: Nov 2002
Posts: 1,951
Likes: 1
From: Shore NJ
Check one of my recent posts on this topic, I just recently switched TT II's from 16" fronts to 17" and in the rear from 17" to 18"....better tire selections in the 17" and 18" for fitment and gearing...
Last edited by 73jst4fun; Jul 12, 2009 at 06:03 AM.
Racer
Joined: Mar 2005
Posts: 294
Likes: 1
From: Racine Wisconsin
This is what I would like to do. I'm curious about the bs on your TTII's. Others have posted using 275/40/18 with custom TTII 18x9.5 5.25"bs. I assume that you used a 9.5" wheel. I already have moved the ebrake bracket. I would prefer to use the 285/40/18 for the extra width and the 27" diameter on the rear.
Drifting
Joined: Jul 2008
Posts: 1,483
Likes: 459
From: Lititz PA
MotorHead said: I have 285/40/18's on the back of mine with no mods, 255/45/17's on the front. This is exactly the information I've been searching for!
Motorhead, can you tell us what back spacing you are using? What spacers/adaptors, if any, are you using?
Thanks everybody for all the great photos and information.
John
Motorhead, can you tell us what back spacing you are using? What spacers/adaptors, if any, are you using?
Thanks everybody for all the great photos and information.
John
Team Owner
Joined: Feb 2003
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From: Lake Norman NC
