1978 Pontiac Grand prix Wheels & Rims

Shop Wheels for 1978 Pontiac Grand prix

The 1978 Pontiac Grand prix is a popular platform for wheel upgrades. Whether you're building a weekend show vehicle, a daily-driven street setup, or a purpose-built track machine, upgrading your wheels is the single biggest visual and performance improvement you can make. At ThreePiece, we carry thousands of aftermarket wheels that are verified to bolt directly onto your 1978 Pontiac Grand prix — no guesswork, no adapters, no fitment surprises.

Every wheel we sell for the Grand prix has been cross-referenced against the factory 5x120.65 bolt pattern and 70.3mm hub bore. The stock wheel is a 14x6, but owners commonly upgrade to larger diameters for improved aesthetics and handling. All orders ship free within the continental US, and our fitment team is available by phone to walk you through every option.

1978 Pontiac Grand prix Trim Levels

The 1978 Pontiac Grand prix was offered in 3 trims. The bolt pattern, center bore, and lug specifications are shared across all trims — differences are primarily in stock wheel diameter and offset. The fitment data below covers all variants.

1978 Pontiac Grand prix Wheel Fitment Specifications

These are the critical numbers you need when shopping for aftermarket wheels for the 1978 Pontiac Grand prix. The 5x120.65 bolt pattern determines which wheels physically bolt onto your vehicle, while the 70.3mm center bore ensures a hub-centric fit. The factory equips this vehicle with 14x6 wheels at a +6 offset.

1978 Pontiac Grand prix Compatible Wheel Sizes

Every wheel size in this table has been verified as compatible with the 1978 Pontiac Grand prix. The table includes both OEM-equivalent replacement sizes and popular plus-size upgrades. When upsizing, remember that a lower-profile tire is needed to maintain the same overall diameter and keep your speedometer accurate.

Best Wheel Brands for the Pontiac Grand prix

The Pontiac Grand prix is a popular platform for wheel upgrades. Based on what we see our customers running and what the community gravitates toward, here are the brands we recommend for the Grand prix:

• Work Wheels
• Volk Racing
• SSR
• Enkei
• Heritage Wheel
• BBS

Don't see the brand you're looking for? Browse all brands or call us — we can source wheels from virtually any manufacturer.

Complete Your 1978 Pontiac Grand prix Build

Wheels are just the beginning. Many Grand prix owners pair their wheel upgrade with performance modifications to get the most out of their vehicle. Here are some popular upgrades that complement a new set of wheels:

• Pontiac Grand prix suspension — often paired with a wheel upgrade for a complete transformation
• Pontiac Grand prix brakes — often paired with a wheel upgrade for a complete transformation
• Wheel & tire packages — save time and money with a pre-mounted, balanced package shipped ready to bolt on
• Installation accessories — hub-centric rings, extended lug studs, TPMS rebuild kits, wheel spacers

Understanding 1978 Pontiac Grand prix Wheel Fitment

Getting the right wheel fitment on your 1978 Pontiac Grand prix comes down to four critical measurements:

Bolt Pattern: 5x120.65

The bolt pattern (also called PCD) is the most fundamental fitment spec — it determines which wheels will physically bolt onto your vehicle. The 1978 Pontiac Grand prix uses a 5x120.65 pattern, which is shared with many other Pontiac models. This means you have a massive selection of aftermarket wheels to choose from.

Center Bore: 70.3mm

The center bore is the hole in the middle of the wheel that sits over your hub. The 1978 Pontiac Grand prix has a 70.3mm center bore. If your aftermarket wheels have a larger bore (which is common), you'll need hub-centric rings to eliminate vibration at highway speeds. We include the correct hub rings with every wheel and tire package.

Offset & Width

Offset determines how far the wheel sits inward or outward relative to the hub face. A lower offset pushes the wheel outward for a more aggressive, flush look. A higher offset tucks the wheel further under the fender for a conservative fitment. The factory offset of +6 is a good baseline — going 5-15mm lower will give you a more flush look.

Related Articles

Read more about the Pontiac Grand prix and wheel fitment on our blog:

• Wheel Alignment Settings That Save Your Tires: Camber, Toe & Caster Guide
• Browse all articles →

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Frequently Asked Questions — 1978 Pontiac Grand prix Wheels