1978 GMC K15 Wheels & Rims
Shop Wheels for 1978 GMC K15
Showing 8 of 8+ wheels compatible with the 1978 GMC K15
GMC's 1978 K15 came equipped with 15x6 wheels across all trims including the Base, High Sierra, Sierra Classic, and Sierra Grande. This classic truck sits on a 6x139.7 bolt pattern, making it instantly recognizable among vintage GMC enthusiasts. Whether you're restoring your K15 or upgrading its stance, ThreePiece.us stocks verified wheels that bolt right on.
You'll find serious variety in sizes, from the original 15-inch diameter up through 16-inch options, with widths ranging from 6 to 8 inches depending on your chosen diameter. Our selection features premium brands like Vision, Work Wheels, Fuel 1PC, Icon Alloys, and Enkei, all verified to fit your K15's specifications. Every wheel ships free to the lower 48 states.
1978 GMC K15 Wheel Fitment Guide — What Works & What to Avoid
Your 1978 GMC K15 uses a 6x139.7 bolt pattern with an 89.0mm center bore. The truck rolled off the line on 15x6 wheels at a 10 offset. You can upgrade to 15x7, 15x8, 16x7, or 16x8 in compatible offsets across all trims—Base, High Sierra, Sierra Classic, and Sierra Grande.
Keep in mind that only the 6x139.7 bolt pattern will fit this GMC. Because the hub is 89.0mm, use hub-centric rings if your chosen wheel has a larger bore. Aggressive offsets or extreme widths risk rubbing on the fender and suspension, so verify fitment specs carefully before ordering.
Every wheel we stock for your K15 bolts on correctly and ships free across the lower 48 states. Vision, Work Wheels, Fuel 1PC, OE Wheels, Carolina Forged, LOCK OFFROAD, Enkei, and Icon Alloys all carry options ready to ship.
1978 GMC K15 Wheel Fitment Specifications
The 6x139.7 bolt pattern determines which wheels physically bolt onto your truck, while the 89mm center bore ensures a hub-centric fit. The factory equips this truck with 15x6 wheels at a +10 offset.
Lug Type
nut
Thread Size
7/16 UNF
Torque Spec
89 ft-lbs
TPMS
No
1978 GMC K15 Compatible Wheel Sizes
| Wheel Size | Offset Range | Compatible Tires | Notes |
|---|---|---|---|
| 15x6 | +null to +20 | 235/75R15 | — |
| 15x7 | +null to +20 | 235/75R15, 30/10.00R15, 30/10.50R15 | — |
| 16x7 | +null to +20 | 245/70R16 | — |
| 15x8 | +null to +20 | 235/75R15, 30/10.00R15, 30/10.50R15 | — |
| 16x8 | +null to +20 | 245/70R16 | — |
Best Wheel Brands for the GMC K15
- Fuel 1PC — Maverick, Assault, Blitz
- Fuel Forged — FF12, FF19
- Method Race Wheels — MR305, MR701
- American Racing — AR924, VN507
- Heritage Wheel
Complete Your 1978 GMC K15 Build
- GMC K15 suspension upgrades — pairs well with a wheel upgrade
- GMC K15 exhaust systems — pairs well with a wheel upgrade
- GMC K15 suspension — pairs well with a wheel upgrade
- GMC K15 brakes — pairs well with a wheel upgrade
- Wheel & tire packages — pre-mounted, balanced, shipped ready to bolt on
- Installation accessories — hub rings, extended studs, TPMS kits, spacers