18x12 rear wheels

[RedRiderZR1]

I have a set of wheels I was going to put on my other vette, but decided I want to put them on the Z. They stick out on the C5 and I'm not interested in fender flares. Question I have is will these work on the Z. They are 18x12 wheels with 335x30x18 tires mounted. The backspacing on them is 8 inches. How deep can you go with the rear wheels without rubbing? I know the stock rears are 7.37 inch backspacing. Is there .6 inches of area back there still to fit these without rubbing?

I have done a search and seen that there are people running 18 and 19 inch wheels with 335 and 345 width rears, but not sure of their backspacing and if they had to do something to the car to fit them.

Anyone out there running 335 and 345 tires and can confirm they fit under there and what their backspacing is and/or mods to make them fit without rubbing something.

Thanks.
Greg

[Coupe89]

I have a set of HRE 504 that are 17x12. I have 335 35 17 on them.
I have .25" from the rim lip to the trailing arms...

18"/19" might be different.... I'll look for some pics if that helps....

And get a back measurement tonight when I get home...

[Blue Flame Restorations]

I have 17x13 Dymag GenII's. Part of the rear knuckle was shaved approx .250 and I have longer studs and spacers. Offset will be the key in your case.

[RedRiderZR1]

Coupe89,
Thanks. That is the information I have been searching for. I know the GS wheels are basically the same backspacing as these wheels except for size (18 instead of 17).

Blue Flame,
Having to shave anything is what I want to avoid doing. If i have to do that, I won't use these wheels on the Z. Too bad though, I think they would look good on it. Not to mention these things look like steam rollers. LOL

[Blue Flame Restorations]

Coupe89,
Thanks. That is the information I have been searching for. I know the GS wheels are basically the same backspacing as these wheels except for size (18 instead of 17).

Blue Flame,
Having to shave anything is what I want to avoid doing. If i have to do that, I won't use these wheels on the Z. Too bad though, I think they would look good on it. Not to mention these things look like steam rollers. LOL

My GenII's have a special offset. You may not have to do anything with the correct spacer and offset. Remember, my wheels are 13".

[Coupe89]

http://a2.sphotos.ak.fbcdn.net/hphotos-ak-ash4/297063_128888773879143_100002740631122_115023_1658 342074_n.jpg
http://a1.sphotos.ak.fbcdn.net/hphotos-ak-ash4/291854_128888903879130_100002740631122_115027_7108 86474_n.jpg
http://a5.sphotos.ak.fbcdn.net/hphotos-ak-snc7/310419_128888817212472_100002740631122_115025_4259 615_n.jpg
http://a3.sphotos.ak.fbcdn.net/hphotos-ak-snc7/313341_128888800545807_100002740631122_115024_3407 22194_n.jpg

[RedRiderZR1]

Coupe89,
Thanks for the pictures. It does look like the wheel is right there as close as you can go. But maybe 18" will help a little bit. But then the big issue is backspacing. Will just have to see how it goes. Looks like your backspacing is perfect to fit a 12" wheel on a Z.

:cheers:

[gtabert]

Queston, are the wheels you have Hub Centric? You do not want to rely on the studs alone for centering the wheel on the hub and absorbing road shock.

[XfireZ51]

Queston, are the wheels you have Hub Centric? You do not want to rely on the studs alone for centering the wheel on the hub and absorbing road shock.

I have stock 12" C6 Z06 wheels w 57mm offset. I am using hub and wheel centric 18mm spacers. Also have longer GM racing studs.

[RedRiderZR1]

I have stock 12" C6 Z06 wheels w 57mm offset. I am using hub and wheel centric 18mm spacers. Also have longer GM racing studs.

So your wheel offset taking the 18mm spacers into the equation is 39mm. My wheels are 38mm offset so they should fit just fine. And yes they are also hub centric as well. Thanks for the info.

Greg

[XfireZ51]

So your wheel offset taking the 18mm spacers into the equation is 39mm. My wheels are 38mm offset so they should fit just fine. And yes they are also hub centric as well. Thanks for the info.

Greg

Greg,

Sounds like you won't be needing any longer studs.

[VetteVet]

Greg,

I have a set of OEM ZR-1 rear A-molds that have been cut and widened 1". They fit fine, although the parking brake cables have to be tied back to prevent rubbing against the inside of the tires. There is definitely 1" of extra clearance on the inside.

Jep

[RedRiderZR1]

Greg,

I have a set of OEM ZR-1 rear A-molds that have been cut and widened 1". They fit fine, although the parking brake cables have to be tied back to prevent rubbing against the inside of the tires. There is definitely 1" of extra clearance on the inside.

Jep

Jep,
I have also measured a stock OEM wheel and realize that these wheels will be 1/2 inch inside compared to them. From what I have been getting in responses it seems a 8" backspace is fine. And thanks for your information. Knowing yours are 1" deeper inside (I'm assuming its extended inside) confirms I will be fine. The face on mine are really close to the stock OEM wheels measurements. So they should line up nicely to the fenders.

I will get around to putting these on next week, so then I will be able to see for sure how they fit.

Thanks for the info. And thanks to everyone for their input.

Greg

[Coupe89]

Sorry it took so long. My back space is 7 7/8"

[RedRiderZR1]

Since I put the wheels on I thought I would update this post for future reference. Below is a picture of the wheels I was asking about fitting on the car. They are the Ronal LZ-VT wheels. Fronts are 18x9.5 Rears are 18x12. Fronts fit perfectly, rears sit in about 3/8 of an inch or so. Not that bad though. Nothing rubs, they just bolted right up. I like the look. Something different.

Picture taken Saturday afternoon on a nice 74 degree beach day. :)
It was a nice day to take the Z for a cruise. :dancing

Thanks everyone...

http://i284.photobucket.com/albums/ll21/koolalbums_photos/ZR1beach.jpg