Update
Update
Pontiac GTA rim manufacturer: JWL (Japan Light Alloy Wheel)
Manufacturer info:
JAWA | Objective
GTA rims were available only in 16x8.
The Pontiac GTA’s came fitted with these rims from 87-92.
GTA 86-88 are the non-dimpled 2 piece design.
GTA 89-92 are the dimpled 1 piece design.
The GTA’s are marked “front” and “rear”.
Front offset:
Front backspacing: 4.75”
Rear offset
Rear backspacing: 5.25”
Notes: It has been stated that the dimpled style is more desirable. The reason GM made the dimpled style was because the non dimpled style center hub was weak and was prone to cracking. In addition, 4 fronts are more desirable due to the offset.
If you run 12" brakes in front, rears will actually fit better than ftonts, due to the 3/8" increase in track width per side of 12" brakes.
or
2: If you plan on having the front wheels narrowed, for drag racing or a big/little look, the "rears" will work better if narrowed than "fronts".
Buick GNX rim manufacturer: JWL (Japan Light Alloy Wheel)
Manufacturer info:
JAWA | Objective
GNX rims were available in 16x8.
Buick GNX came fitted with these rims in 1987.
All GNX rims were not dimpled and were a 2 piece design.
The GNX are marked “OFF-15” for the fronts and “OFF-23” for the rears. Both front and rear also have the marking of “8JJX16”.
Front offset: 15mm
Front backspacing: 3 15/16”
Rear offset: 23mm
Rear backspacing: 3 9/16”