1978 GMC G15 Wheels & Rims
Shop Wheels for 1978 GMC G15
Your 1978 GMC G15 Rally, Rally STX, or Vandura came rolling off the line with 15x6 wheels, and now you can upgrade to something that truly fits your van's personality. ThreePiece.us stocks premium wheels from Black Rhino, Dirty Life, Carolina Forged, Fuel 1PC, Icon Alloys, Vision, 9Six9 Wheels, and LOCK OFFROAD—all verified to bolt directly onto your 5x127 pattern with zero guesswork required.
Whether you're hunting bigger rubber or a fresh aesthetic, we offer sizes ranging from 15x6 all the way up to 17x7.5, giving your G-series the stance upgrade it deserves. Every wheel ships free to the lower 48 states, so you can transform your classic van without breaking the bank on logistics.
1978 GMC G15 Wheel Fitment Guide — What Works & What to Avoid
Your 1978 GMC G15 Rally, Rally STX, or Vandura uses a 5x127 bolt pattern and rolls on 15x6 wheels with an 11mm offset from the factory. You can step up to 15x6.5, 15x7, 15x7.5, or 15x8, or jump to 16-inch and 17-inch options up to 17x7.5. The van's non-staggered setup gives you full flexibility across all compatible sizes.
Keep in mind that only 5x127 bolts fit this van—don't force any other pattern onto the hubs. The center bore measures 77.8mm, so use hub-centric rings if your wheel's bore runs larger. Wide and aggressive offsets risk catching the fenders or suspension components, so stick within the listed compatible sizes to avoid costly contact issues.
Every wheel we offer for your G15 bolts right on and ships free throughout the lower 48 states. Browse our in-stock selection from Black Rhino, Dirty Life, Carolina Forged, Fuel 1PC, Icon Alloys, Vision, 9Six9 Wheels, and LOCK OFFROAD to find the look that fits your van.
1978 GMC G15 Wheel Fitment Specifications
The 5x127 bolt pattern determines which wheels physically bolt onto your vehicle, while the 77.8mm center bore ensures a hub-centric fit. The factory equips this vehicle with 15x6 wheels at a +11 offset.
Lug Type
nut
Thread Size
1/2 UNF
Torque Spec
74 ft-lbs
TPMS
No
1978 GMC G15 Compatible Wheel Sizes
| Wheel Size | Offset Range | Compatible Tires | Notes |
|---|---|---|---|
| 15x6 | -19 to +15 | 205/75R15, 195/75R15, 215/75R15 | — |
| 15x6.5 | -19 to +15 | 205/75R15, 195/75R15, 215/75R15 | — |
| 15x7 | -19 to +15 | 205/75R15, 215/75R15, 30/9.50R15 | — |
| 16x7 | -19 to +15 | 205/80R16, 215/75R16, 215/85R16 | — |
| 17x7 | -19 to +15 | 215/70R17, 225/70R17, 225/75R17 | — |
| 15x7.5 | -19 to +15 | 215/75R15, 30/9.50R15, 205/75R15 | — |
| 16x7.5 | -19 to +15 | 205/80R16, 215/75R16, 215/85R16 | — |
| 17x7.5 | -19 to +15 | 215/70R17, 225/70R17, 225/75R17 | — |
| 18x7.5 | -19 to +15 | 225/60R18 | — |
| 15x8 | -19 to +15 | 215/75R15, 30/9.50R15, 205/75R15 | — |
| 16x8 | -19 to +15 | 205/80R16, 215/75R16, 215/85R16 | — |
| 17x8 | -19 to +15 | 215/70R17, 225/70R17, 225/75R17 | — |
| 18x8 | -19 to +15 | 225/60R18 | — |
| 19x8 | -19 to +15 | 235/55R19 | — |
| 20x8 | -19 to +15 | 235/55R20 | — |
| 20x8.5 | +null to +15 | 235/55R20 | 1. Check fitment, possible clearance issues |
| 20x9.5 | +null to +15 | 235/55R20 | 2. Body Modification Required |
Best Wheel Brands for the GMC G15
Complete Your 1978 GMC G15 Build
- GMC G15 suspension — pairs well with a wheel upgrade
- GMC G15 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