Tim_Ko

What are the options for mounting 16-8.5-50mm offset wheels on a 16-8.5-32mm offset car? 1) Longer studs and a 3/4" flat aluminum plate 2) spacers 3) Run the stock wheels

I just got a car and want to drive it for a while to see if there are some hidden (aka expensive) problems before throwing money at something like a wheel/tire.

I would appreciate a good source or a used set.

Thanks a lot.


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1984-1996 Corvette Wheels 1984 (base)
front & rear 15"x7" 17mm
Goodyear Eagle GT, P215/65R-15
These wheels were in the catalouge, but were never installed on any new Corvette.
1984 (base)
front & rear 16"x8.5" 32mm
Goodyear Eagle VR50, P255/50VR-16

1984 (z51)
front 16"x8.5" 32mm
rear 16"x9.5" 38mm (6.7" backspacing)
Goodyear Eagle VR50, P255/50VR-16
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1985 (base)
front & rear 16"x8.5" 32mm
Goodyear Eagle VR50, P255/50VR-16

1985 (z51)
front & rear 16"x9.5" 38mm (6.7" backspacing)
Goodyear Eagle VR50, P255/50VR-16
black painted centers
1986 (base)
front & rear 16"x8.5" 32mm
Goodyear Eagle VR50, P255/50VR-16

1986 (z51)
front & rear 16"x9.5" 38mm (6.7" backspacing)
Goodyear Eagle VR50, P255/50VR-16
aluminum centers
1987 (base)
front & rear 16"x8.5" 32mm
Goodyear Eagle VR50, P255/50VR-16

1987 (z51,z52)
front & rear 16"x9.5" 38mm (6.7" backspacing)
Goodyear Eagle VR50, P255/50VR-16
grey painted centers
1988 (base)
front & rear 16"x8.5" 50mm
Goodyear Eagle VR50, P255/50VR-16
1988-1989 Callaway (b2k)
???
???
1988 35th Anniversary Edition
front & rear 17"x9.5" 56mm (7.4" backspacing)
Goodyear Eagle ZR, P275/40ZR-17
White Wheels
1988 (z51,z52)
front & rear 17"x9.5" 56mm (7.4" backspacing)
Goodyear Eagle ZR, P275/40ZR-17
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1989 (all)
front & rear 17"x9.5" 56mm (7.4" backspacing)
Goodyear Eagle ZR, P275/40ZR-17
1989 (pre production zr1)
front 17"x9.5" 56mm (7.4" backspacing)
Goodyear Gatorbacks, P275/40ZR-17
rear 17"x11" 36mm (7.93" backspacing)
Goodyear Gatorbacks, P315/35ZR-17
1990 (base)
front & rear 17"x9.5" 56mm (7.4" backspacing)
Goodyear Eagle ZR, P275/40ZR-17
1990 (zr1)
front 17"x9.5" 56mm (7.4" backspacing)
Goodyear Gatorbacks, P275/40ZR-17
rear 17"x11" 36mm (7.93" backspacing)
Goodyear Gatorbacks, P315/35ZR-17
1991 (base)
front & rear 17"x9.5" 56mm (7.4" backspacing)
Goodyear Eagle ???, P275/40ZR-17
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1992 (base)
front & rear 17"x9.5" 56mm (7.4" backspacing)
Goodyear Eagle GSC, P275/40ZR-17
"SAWBLADES" with cast surface
1991 (zr1)
front 17"x9.5" 56mm (7.4" backspacing)
Goodyear Gatorbacks, P275/40ZR-17
rear 17"x11" 36mm (7.93" backspacing)
Goodyear Gatorbacks, P315/35ZR-17
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1992 (zr1)
front 17"x9.5" 56mm (7.4" backspacing)
Goodyear Eagle GSC, P275/40ZR-17
rear 17"x11" 36mm (7.93" backspacing)
Goodyear Eagle GSC, P315/35ZR-17
"SAWBLADES" with cast surface
1993-1996 (base)
front 17"x8.5" 56mm
Goodyear Eagle GSC, P255/45ZR-17
rear 17"x9.5" 56mm (7.4" backspacing)
Goodyear Eagle GSC, P285/40ZR-17
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1993-1995 (z07)
front & rear 17"x9.5" 56mm (7.4" backspacing)
Goodyear Eagle GSC, P275/40ZR-17
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1996 (z51)
front & rear 17"x9.5" 56mm (7.4" backspacing)
Goodyear Eagle GSC, P275/40ZR-17
"SAWBLADES" with machined surface
1993 (zr1)
front 17"x9.5" 56mm (7.4" backspacing)
Goodyear Eagle GSC, P275/40ZR-17
rear 17"x11" 36mm (7.93" backspacing)
Goodyear Eagle GSC, P315/35ZR-17
"SAWBLADES" with machined surface
1994-1995 (zr1)
front 17"x9.5" 56mm (7.4" backspacing)
Goodyear Eagle GSC, P275/40ZR-17
rear 17"x11" 36mm (7.93" backspacing)
Goodyear Eagle GSC, P315/35ZR-17
1995 pace car
front & rear 17"x9.5" 56mm (7.4" backspacing)
P275/40ZR-17 B/W Tires
1996 Collectors Edition (base)
front 17"x8.5" 56mm
Goodyear Eagle GSC, P255/45ZR-17
rear 17"x9.5" 56mm (7.4" backspacing)
Goodyear Eagle GSC, P285/40ZR-17

1996 Collectors Edition (z51)
front & rear 17"x9.5" 56mm (7.4" backspacing)
Goodyear Eagle GSC, P275/40ZR-17
1996 Grand Sport (coupé)
front 17"x9.5" 56mm (7.4" backspacing)
Goodyear Eagle GSC, P275/40ZR-17
rear 17"x11" 50mm (7.93" backspacing)
Goodyear Eagle GSC, P315/35ZR-17

1996 Grand Sport (convert.)
front 17"x8.5" 56mm
Goodyear Eagle GSC, P255/40ZR-17
rear 17"x9.5" 56mm (7.4" backspacing)
Goodyear Eagle GSC, P285/40ZR-17

Additional information

Link to a 1984-1996 Corvette Suspension Chart

All 1984-1996 Corvette wheels have 5 bolts and the bolt circle diameter is 4.75"

To use 1988-1996 wheels on a 1984-1987 Corvette you need 0.75" spacers.

The 11" wide rear zr1 wheels will fit 1984-1987 Corvettes without spacers.
The 1984 and 1985 wheels were made from an aluminum casting that do not shine much when polished.

Enkei produced the 1986 and 1987 wheels for GM and they were made of an aluminum that could be polished to a high luster. These Enkei produced wheels also were slightly larger on the inside, which means you can use the '88 and later 2-piston front brake caliper with a 13" rotor. The Enkei produced wheel can be identified by a small symbol in one of the slotted radial wheel vents which looks like an "m" grafted to an upside down "J".


Tire Size Calculator
Use the calculator to see what happens to your speedometer reading when you change the size of your tires and wheels. The graphic shows your stock tire selection in an outline overlaid on your new tire selection.

leesvet

EZ-accessory co.

Search fleabay for spacer/adaptor. If you have to space out, use concentric hub spacer/adaptors, NOT cheap plates. Its gonna cost you around $75 ea for quality spacers. I run 4 on my car to move the 17 sawblades out since they were different offset than the original 87 sawtooth wheel.

Tim_Ko

Thanks Lee for taking the time ...

A "concentric hub spacer/adapter" ... what the heck is that? I'll google search that one. $75 ea is a show stopper. That's more than a little pricey.

I looked on fleabay and I couldnt find anything that was 3/4" thick.

I don't want to spend too much time on this but what is wrong with a plate with longer studs?

Thanks agin,
Tim

leesvet

The hubcentric spacer/adaptor IS just a chunk of billet aluminum plate with new studs...

This is what has to be done to make up for the loss of 18mm of offset.
(3/4")

Look for ez accessory. their stuff is all priced and clearly and properly ID'd on the website. They sell on fleabay alot.

"hubcentric" is just the model name for the plate thats been centered to fit the hub correctly....proper machining. There is a cheaper model thats not going to ride on the hub exactly right...you might(will) have to mess with it to center it. Balance issues....
Everybody that goes from 16" to 17 or bigger has to cope with the offset issue. For those like me, that did not want an aftermarket wheel that could be ordered with the correct offset, I had to use the adaptors 4.75 X 4.75 X 1"+ to fit the sawblade wheel to my 87 chassis and make it look right. I tried it without the spacer/adaptor and it looked too goofy with the wheel set inward almost an inch. .

UPDATE:

you're lucky day ! on sale for $80 a PAIR. 1" thick is the right size to use. I used slightly bigger to clear some big brakes...

http://www.ezaccessory.com/Hub_Centr...475-5475hv.htm

rodj

The later rims bolt on and work fine on early cars.

The spacer / adapter is only to reposition the wheel to the same position relative to the guards for cosmetic reasons
( 50mm offset sits 3/4" further in on 84 - 87 cars )
so for your " testing " purposes I would not worry about them

JackDidley

I have 16x8 50mm offsets on the front of my 87. No spacers. No problems. Looks a little funny but most people dont notice.

Cliff Harris

To JackDidley: do you have problems with the tire rubbing the frame at full turn?

JackDidley

No problems at all. Pic of car below.