i need some help guys.. 1990 base model. the wheel offset on these things are crazy... is there any wheels i can buy that have the same positive offset but not so much negitve offset? by the way this is a c4 k-member and suspension.. but its not on a corvette..

 

Hi the offset you have is 54mm for 88-96, the 84-87 have 38mm offset.
They will be out around 3/4 inch further.

Those of us with 84-87 use 1 inch adapters with 88-96 54 mm offset wheels.

 

[QUOTE=gerardvg;1589059537]Hi the offset you have is 54mm for 88-96, the 84-87 have 38mm offset.
They will be out around 3/4 inch further.

Those of us with 84-87 use 1 inch adapters with 88-96 54 mm offset wheels.



thanks man! Now what im looking for is to buy some wheels.. not vette wheels, that will stay under my fender and not stick out, but are also not to wide.. is this possible? and when you say 54mm thats negitive offset right? what is the positive offset?

 

A wheel is constructed with either a + offset or a - offset and that dimension is the hub mating surface from the centerline of the wheel. More towards the outside of center is +, more towards the inner of center is -. A wheel does NOT/can NOT have both a + & - dimension

You just need some very basic wheel dimensioning education.

Does a '90 Corvette wheel fit now and NOT hit either the suspension components and clear the fender? If not and it hits the inner suspension you need a wheel with less/smaller + offset to clear the suspension components. If a '90 wheel hits the suspension components it's quite safe to assume your x-member and suspension components are from an '87 or earlier Corvette and you'll need wheels the have something with a + offset of 40 or less.

There's not very much help for you here aside from identifying your suspension. The wheel spindle/knuckle will have a casting number on them. They will be 8 digit numbers. If you post them the suspension can be identified and I could give you a "BASE" wheel dimension for you to "START" with.

If this suspension is in a truck it's very common to use wheels with a - offset (or called deep-dished) to move the outer wheel edge more "outboard" to improve the appearance to the body/fender.

Google is your friend for educational tutorials. Google "wheel offset/backspacing" images for some dimensional guides and web for tutorials.

 

There may a difference in terminology here.
Street/track racers & the street rod/custom gang normally measure wheels from the back of the wheel lip to the center of the hub mounting face & refer to this measurement as "wheel back space".
WVZR-1 has explained how the + or - mm offset is figured from the wheel center line.
Your minimum wheel diameter will depend on what brake package your Vette front stub has.
If front rotor diameter is 11.5" & .79 thick you have an early front stub.
If front rotor diameter is 12" & .79 thick you have an 88 up stub with base brakes.
With either above example 15" minimum diameter wheels designed for disc brakes can be used.
If front rotor diameter is 13" & 1.1 thick you have performance brakes that need a
minimum 17" diameter wheel.

 

thanks man! i got it figured out!