Buick Grand National / GNX G-body (1986-1987) Wheel Offset Calculator | Fitment Stance
Compare wheel and tire dimensions for the Buick Grand National / GNX (G-body (1986-1987)) against the recorded OEM baseline: 8x16 ET-15, 245/50R16, 5x120.65.
Recorded OEM baseline
Verification pending. Recorded values are provisional; confirm the exact vehicle baseline before calculations or purchases.
| Years | G-body (1986-1987) |
|---|---|
| Market | unspecified |
| Front wheel | 8x16 ET-15 |
| Front tire | 245/50R16 |
| Rear wheel / tire | Rear offset verification pending |
| Bolt pattern | 5x120.65 |
| Center bore | Not verified |
| Thread size | Not verified |
| Fastener / seat | Not verified |
How to use this record
The calculator compares nominal wheel and tire position with this OEM baseline. It does not calculate fender, suspension, brake, steering, or loaded clearance. Tires with the same printed size can differ by manufacturer. Confirm applicability for the exact year, market, trim, and package, then measure or test-fit before buying.
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