needing to use about 2" spacers to run corvette wheels on my 70, was going to use the billet with their own studs, anybody runs these, any problems, Thanks Rob....

I've had 1 inch billet aluminum "adapters" on all four corners for three years. I've been drag racing and road racing with them. No problems. They're stronger than my wheels.

Spend the extra bucks and get them made hub AND wheel centric.

Keith, if you don't mind me asking, where did you get them, and what did they cost?

I've been thinking a set of polished ZR1 wheels would look good on my station-wagon :D

Would you need them on a late model car?

I got mine here:

http://www.motorsport-tech.com

I think I paid around $70 a piece for them. They were a little more expensive because I had them built hub and wheel centric and also had 1/2" wheel studs installed in them. Do a search on Ebay for "wheel adapters" and you'll find a crap load of sellers making them now. The prices have dropped significantly also. Competition you know.

Check Ebay also for the wheels.

Would you need them on a late model car?The '91-96 Caprices used the same chassis as the '77-90 caprices, so they have pretty deep-offset wheels. If I would go this route, I'd need to adapt from 5" to 4-3/4" bolt circle, and also space it out an inch or two as well.

they have the billet spacers that will do that as well, like other post several on ebay, thanks Rob...

The '91-96 Caprices used the same chassis as the '77-90 caprices, so they have pretty deep-offset wheels. If I would go this route, I'd need to adapt from 5" to 4-3/4" bolt circle, and also space it out an inch or two as well.

Derek,I might have what you need,out in my shop. Have a set of Vette Brakes & Products 1" and 2" billet adapter/spacers to adapt a 4.75 BC wheel to a 5" BC hub. Once upon a time,I used them to run a set of 93 40th Anniversary Corvette wheels on my custom Chev ext cab 1/2 ton.

Clint, I'll keep that in mind :) It will be a while before that car gets new wheels... the Chevelle's 17x9.5 and 17x11 Budniks take priority. :thumbsup:

I have a set of speedlines that I want to run on my 71 convertible with stock suspension. They were on a ZR-1 but they have about 1/8" less backspace. From what I can figure on what stu is running on the standard size ZR-1 wheels for the front is a 1" spacer that equals to a 5 11/16" backspace. On the rear he has a 15/16 spacer that equals to a 7 1/16" backspace more or less. I think that I can run a 5 1/4" backspace which should be a 1 7/8" spacer for the front. On the rear I was thinking a 6 1/8" backspace and the spacer would be 1 1/8". I am looking for some thoughts on the fit and spacers. If I could get some feedback from stu and Clint44 since you guys have tried a lot of different things.
Thanks for any help

Nelson


Tires front 275/40 Rear 315/35

I try to get away without adapters if I can but when we need them we get em from Fred Goeske at http://www.wheeladapter.com/ He`ll make them any size and pattern you like and will also make them both hub and wheel centric if you ask him to. The prices are reasonable and the service is so fast it`ll make your head spin! We`ve had custom one off adapters shipped the same day. You can`t beat that. Mark SC&C

I have a set of speedlines that I want to run on my 71 convertible with stock suspension. They were on a ZR-1 but they have about 1/8" less backspace. From what I can figure on what stu is running on the standard size ZR-1 wheels for the front is a 1" spacer that equals to a 5 11/16" backspace. On the rear he has a 15/16 spacer that equals to a 7 1/16" backspace more or less. I think that I can run a 5 1/4" backspace which should be a 1 7/8" spacer for the front. On the rear I was thinking a 6 1/8" backspace and the spacer would be 1 1/8". I am looking for some thoughts on the fit and spacers. If I could get some feedback from stu and Clint44 since you guys have tried a lot of different things.
Thanks for any help
Nelson
Tires front 275/40 Rear 315/35

Nelson,real ZR-1 wheels have 7.4" backspacing on both ends. Their 17x9.5 fronts have +56mm offset and their 17x11 rears have +36mm offset.
If you're running tubular A-arms,you can run up to 6" backspacing in front. In the rear,anything more than 6.25" is getting tight.

Nelson,real ZR-1 wheels have 7.4" backspacing on both ends. Their 17x9.5 fronts have +56mm offset and their 17x11 rears have +36mm offset.
If you're running tubular A-arms,you can run up to 6" backspacing in front. In the rear,anything more than 6.25" is getting tight.



Hi Clint,
Thanks for the response. I bought these wheels back in the 90’s for a ZR-1 but they have a little less backspace then the originals. Basically it gives a little more outer polished lip. These are a true three piece magnesium center wheel and that is why a little different offset. As close as I can measure the Front are 9 1/2” x 17 with 7 1/8 backspace, Rear 11 x 17 with 7 ¼ backset. Let me know what you think with these sizes would be a good backspace and spacer size. All my suspension I will try and stay stock. So would you run a 1” spacer in the rear maybe a 2” or 1 7/8" spacer in the front?
Thanks again for the input.

Nelson

Nelson,

I purchased my billet adapters from a person on ebay "gotdubs20".
Excellent machine work. I would buy from him again. He is located in SoCal.
Machine work done on premise...go USA mfg!

I also have the 56 / 36 mm offsets on my Elky.

stu

Stu

Do the spacer sizes look correct? Thanks for the input

Nelson

Hi Clint,
Thanks for the response. I bought these wheels back in the 90’s for a ZR-1 but they have a little less backspace then the originals. Basically it gives a little more outer polished lip. These are a true three piece magnesium center wheel and that is why a little different offset. As close as I can measure the Front are 9 1/2” x 17 with 7 1/8 backspace, Rear 11 x 17 with 7 ¼ backset. Let me know what you think with these sizes would be a good backspace and spacer size. All my suspension I will try and stay stock. So would you run a 1” spacer in the rear maybe a 2” or 1 7/8" spacer in the front?
Thanks again for the input.
Nelson

With stock A-arms,I would probably shoot for 5.75" backspacing or a smidgen less.

Thank you for the input Clint
The rear look ok?

What do you think about a 1 1/2 spacer in the front which should give me a 5 5/8 backset. Rear with a 1 1/8 spacer should give me a 6 1/8 backset. Will I need to change my stock front sway bar?
Thanks again both of you for the help

Nelson

What do you think about a 1 1/2 spacer in the front which should give me a 5 5/8 backset. Rear with a 1 1/8 spacer should give me a 6 1/8 backset. Will I need to change my stock front sway bar?
Thanks again both of you for the help
Nelson

Without measuring the car,you cannot be 100% sure but 6 1/8" backspacing is a great starting point.
The front sounds fine. You might need a larger diameter sway bar. Dennis should be able to give you a better idea what's needed. I'm still running a 7/8" bar but I think I need more.

Without measuring the car,you cannot be 100% sure but 6 1/8" backspacing is a great starting point.
The front sounds fine. You might need a larger diameter sway bar. Dennis should be able to give you a better idea what's needed. I'm still running a 7/8" bar but I think I need more.



Clint,
My car has the factory F41 suspension. It has something like a 1 1/8" sway bar. I had a hard time finding stock bushings so I bought the poly ones. Thanks again for the help


Nelson

I am running the same spacer sizes as Keith Anderson. Take a look at his website for pictures. Personally, I think the spacing looks great!

If you are not sure, I would mock up spacers using wood or plastic.

I took Keith's 1 inch recommendation as a baseline and then mocked up the adapters made out of wood. I then inserted these and then looked at the spacing from the rear and from the side.

Final decision was to go with the 1 inch recommendation that Keith uses.

Hope that helps.


Stu

Do the spacer sizes look correct? Thanks for the input

Nelson