rear wheel question
 

Hello,

does anybody know what the rear wheel offset is for a zr1. I bought 17/11 rears and they sent them for a regular corvette. I cant seem to find any for a original zr1 so I am wondering if adding a spacer would make it work. The salesman made a mistake when he sold me these wheels but I cant seem to find any that actually have a zr1 offset amold that are deepdish also. Will a spacer work? the guy at the tire place said get a 1 inch spacer and that should do it. Any help will be appreciated. edramos.

Re: rear wheel question
 

there are no aftermarket deep lug rears on the market. the rear offset is 36mm I believe

Re: rear wheel question
 

36MM is the correct rear offset. 50MM is the rear offset for a Grand Sport

Re: rear wheel question
 

The OE offset is 36mm as mentioned. If you want to use what you've bought then you need a 14mm spacer to "get even" BUT I'd suggest an 18mm spacer to move it just 4mm further. You need "hub-centric pass-through" spacers done by only a few vendors out there, you'll need 10 wheel studs also but the work isn't difficult. I've got 16mm, "Z51Jeff" I believe has 18's and Lee "LGAFF" has 18's also I believe. BTW - they're "safe"!!!

Definitely a NO on the 1" stuff. The fellow who did mine I understand is in poor health these days and isn't near you at all. If I can help at all ask. I know where I'd go if I needed to do them again and my old reliable fellow couldn't do them but maybe you'd rather maybe buy correct wheels.

What do you actually have for wheels now? Are you attempting to add "black" GS or just what?

Re: rear wheel question
 

Carter200 on this forum makes the hubcentric spacers you need.

Re: rear wheel question
 

14mm is that about 1 inch?? I can get hubcentric billet 1 inch spacers no problem.

Re: rear wheel question
 

25 mm in a inch. so 14mm is just a little over half inch spacer. I thought it would be more?

Re: rear wheel question
 

ok I will look around for 18mm hubscentric spacers. thanks.

Re: rear wheel question
 

I threw my pitted amolds away today. I thought these would fit but they dont. I am in a pickle and need to make these work. the hubcentric spacers are spacers that mount on your hub with bolts and then you bolt the rims on to them. I dont think I will need new wheel studs just more bolts. I found a company that would make 20mm. Let see if I can find 18mm. I contacted carter200 to see if you can sell me some. thanks for your help. edramos.

Re: rear wheel question
 

What I mentioned are "pass through" spacers NOT bolt-on adapters. The math is like this, the wheels you bought are 50mm, the ZR-1 wants 36mm, 50 - 36 gets you what I called "even". Everything else is moving the tire/wheel out-board more. I would think anything greater than 18mm is a push. I'd do and I have pass-through. You would need studs. Depending on how your new wheels are constructed you need a minimum of something 20mm or greater to use the adapter you mention. Post a snap-shot of the back-side of your wheel flange.

Re: rear wheel question
 

i found a company called motorsport tech. the make custom hub centric spacers. they make a spacer that is bolted onto my hub that has studs already installed on the spacer. it also has a lip in the center when your wheels aligns onto the spacer so it wont move around and would be a perfect fit. they are in nevada and the guy will call me tomorrow am to place an order. the owner already knew what i wanted and the sizes by heart. he said he has done money spacers for corvettes and zr1's. bring them up on your computer and take a look at all the different kinds of spacers his company makes. that is all they do. thanks for your help.

Re: rear wheel question
 

I'm familiar with them and have spoken to them in the past. They've never done any for me and I would still choose the pass-through but it's certainly a solution for you. Their minimum is 19mm and should do so long as the wheel that you've bought is a 50mm offset. Do NOT assume.

It helps your cause if there's a depression between each wheel stud bore on your wheels. I mentioned posting a snapshot of the wheel back-side a couple posts ago. You need to measure the length of your wheel stud that is exposed from the rotor flange regardless of what they tell you, you will need to either have a recess in your wheel to absorb that additional length or you will need to trim your studs on the car now to a length that's less than the thickness of your adapter.

You need to first confirm the wheel that you've bought - there's no telling for sure with out checking for casting information and confirming that by checking the dimensions with measuring devices.

Re: rear wheel question
 

the wheels I bought have the following dimensions: 17x11/ offset 50mm/ bolt pattern-5.120.6.5/ hubsize is 70.7/ and back spacing is 7.97. i realize that the wheel studs cannot stick out past the spacer and must be trimmed. apparently there is a run on these rims because now they are very difficult to get. even oe wheel is out of them and they are the main distributor of these wheels in the country. I was not able to find a chrome a mold that fits a zr1 with 36mm back spacing. nobody has any. I will try to use what I have and try to have oe wheels pick up some of the cost of the spacers. they want to work with me so I think they will.