I have searched and searched, but all I come up with are a lot of opinions and no facts. As of right now I have a 17X9.5/18x10.5 Z06 wheel combo that I have yet to install on my 91' vert but I want to go bigger. I was wondering if you guys to point in the right direction as to what will be necessary to make Z06 19x9.5 with +64 offset fit the front with no rubbing or any other problems? Also what will be necessary to make Z06 20x10.5 or 11" with +64 offset fit the rear with no problems? I know the the fenders lips my have to be rolled but I want the rims to fit flush and not sit out. How much work is involved in rolling the fenders and if I decided to let someone else do it how much so I be looking to pay?

If you guys could be also tell me what tires are usually used for this type of setup that would also be a big help. I know I have a lot of question but the last one is what size spacers would be needed.

Just to let you not my car is not lowered and I have my stock thirdgen rear-end.

Thanks in advance,
Jay

 

you need BIG THICK ADAPTERS very thick...2.5-3 inches

 

Can anyone help me out?

 

1 factual simple answer. If you want them fit fit correctly under the fenders without rubbing at all through turning radius and suspension travel, then you NEED to find someone very good in sheetmetal work.

 

What I would do is divide it up into two things. First the backspacing/offset specs. Second the overall wheel+tire height. So back to the first thing, since you're focusing on backspacing/offset the diameter dosnt matter, you focus on the wheel width. So if you want a 19x9.5 to fit, use the same backspacing/offset specs from a 17x9.5 that fits. Much easier to find the specs that way when you focus on width (so searching for "x9.5 backspacing" will return alot of threads that would include specs you could use). One big thing to keep in mind when it comes to backspacing/offset is that our cars can use a range of specs, no single answer. So for example you could have two guys with 17x9.5, one has 5.25" backspacing, the other has 5.5" backspacing and both wheels fit. Pays off to do the research to determine not only will it fit, but will it be the fitment you want. Once you got the backspacing/offset specs down, then you focus on the second part which is the overall wheel+tire height. This is where the wheel diameter plays a big role in tire selection. You'll want to use a wheel calculator to determine the overall height of the different tires you want to use. Usually it is considered the best idea to attempt to maintain the OEM overall height (think its 25.6" not 100% sure). Thing with big wheels, the bigger the diameter gets the less of a tire selection you get to maintain OEM heights. Some people go taller than stock but then you increase the chance of rubbing. With the right research done I'm sure you can fit 19x9.5 fronts and 20x10.5 or 20x11 rears. All depends on the specs you use.

 

also, do a search and you'll find the reasons not to run different size front/rear wheel combos on our cars. They don't look correct for our wheel wells. The vettes have a larger rear wheel well opening then the front, so it looks right, but if you see pics of it on a 3rd gen, it looks like azz.
- technically this is an opinion, but I'm just going by sizing/clearance
For like $60 Jegs has a wheel/tire siz checker that bolts to your hub and allows you to simulate multiple tires/wheel sizes and offsets. That would allow you to actually check fit before making a large investment.

 

Thanks for the help guys. I really appreciate it.

Jay

 

Could you guys point me in the right direction, I've tried searching but I can find no pics of cars with different size front and back wheels?

Thanks,
Jay

 

Kandied91Z posted the pics, but I think it was on a thread started by someone else. - the camaro he posted had 18's front, 19's on back. - looked like it had mis-matched wheels, but the only difference was the diameter.

 

Shawn18jgr. Search him name he has 19" & 20" combo - looks great. I think I spelled it right.