1978 Buick Century Tires

A 1978 Buick Century uses one of four radial tire sizes: 185/75R14, 195/75R14, 205/70R14, or 205/75R14. The exact size depends on the sub-model. The 6 Cyl. uses 185/75R14 or 195/75R14, the 8 Cyl. uses 195/75R14 or 205/70R14, the Sport Coupe uses 205/75R14, and the Wagon uses 195/75R14 or 205/70R14.

That means the first decision is identifying the exact Century configuration rather than choosing by make and model alone. Once the correct size is confirmed, selection can move to sidewall style, brand, tire series, and wheel-width compatibility. If the car has replacement wheels or a long-ago size change, check the mounted tire size and actual wheel setup before ordering.

The 1978 Buick Century uses 14-inch rims across its primary tire fitments. All four sizes associated with the model line—185/75R14, 195/75R14, 205/70R14, and 205/75R14—are built around a 14-inch wheel diameter, so the final number in each size confirms the same rim diameter.

Rim diameter is only part of the fitment picture, though. Different products in these sizes can call for different wheel-width ranges, so the actual width of the wheel still matters when comparing tires. A Century with aftermarket wheels, different trim rings, or an older replacement wheel should be measured and checked before changing sizes or tire series.

The 1978 Buick Century has more than one tire size because fitment varies by sub-model. Buick used different 14-inch radial sizes across the 6 Cyl., 8 Cyl., Sport Coupe, and Wagon versions, so the model line does not share one universal tire size. The spread runs from 185/75R14 up to 205/75R14.

That variation matters because a size that belongs on one Century configuration should not be assumed correct for another. The practical approach is to confirm the exact sub-model first, then compare the wheel width and the tire currently on the car. That avoids turning a straightforward replacement into a clearance or appearance mismatch.

Start with the correct size for the exact 1978 Buick Century sub-model, since the car uses four different 14-inch radial sizes across the lineup. After size, the important factors are wheel-width compatibility, sidewall appearance, brand, tire series, and any meaningful product differences such as load figures or weight within the correct size.

A buyer restoring the car’s look may lean toward a narrow or wide whitewall, while a more performance-flavored presentation may point toward redline, dual redline, blackwall, or raised white letter depending on the size. The right choice is the one that matches the car’s confirmed fitment, visual goal, and wheel setup without assuming every 14-inch radial is interchangeable.

Sidewall choices for the 1978 Buick Century include narrow whitewall, wide whitewall, redline, dual redline, blackwall, and raised white letter. The exact selection depends on the tire size. Some sizes stay close to traditional whitewall offerings, while others—especially 205/70R14 and 205/75R14—open up more visibly different period-style looks.

That makes sidewall style one of the biggest appearance decisions once the correct size is settled. A wagon or formal coupe can look very different on a wide whitewall than it does on a redline or RWL tire. Since these are appearance-driven choices within size-specific fitments, confirm the proper size first and treat sidewall style as the finishing detail.

Tires for the 1978 Buick Century are available from Coker Classic, BFGoodrich, Michelin, American Classic, Maxxis, Tornel, and Travelstar, depending on size. Brand coverage is not the same across all four fitments. Some sizes are mainly whitewall-oriented, while others include more specialized series such as Radial T/A, Silvertown Radial, Star Series, and Michelin XWX.

Brand choice is most useful after the correct tire size has been narrowed down. At that point, the comparison becomes more practical: sidewall style, series character, wheel-width range, and the kind of look you want on the car. Picking a brand first and trying to force it into the wrong size is the easiest way to complicate an otherwise simple fitment decision.

A period-style 1978 Buick Century tire choice starts with the correct original-type fitment category for the exact sub-model, which in this case means the proper 14-inch radial size. From there, the most restoration-oriented options are usually the classic sidewall treatments available in that size, especially narrow or wide whitewall designs and selected redline offerings.

The best visual match depends on how the car is being presented rather than on one universal answer for every Century. A Sport Coupe may suit a different look than a Wagon or 6-cylinder sedan. When exact originality matters, compare the tire choice against period photos, original sales material, or Buick enthusiast documentation before settling on a sidewall style.

Tire construction is straightforward on the 1978 Buick Century because its primary fitments are radial tires across all covered sizes. Even with the same radial construction, though, the finished look can change quite a bit depending on whether the tire uses a narrow whitewall, wide whitewall, redline, dual redline, blackwall, or raised white letter sidewall.

That means restoration appearance is shaped less by bias-ply versus radial choice here and more by selecting the right size and visual treatment. A tall whitewall can give the car a more formal late-1970s presentation, while redline or RWL styling shifts the look in a sportier direction. The wheel style and trim on the car should guide that final decision.

Yes, modifications can affect tire fitment on a 1978 Buick Century even when the tire size looks close to stock. Aftermarket wheels can change width and offset, and suspension changes can alter clearance at the fender, frame, or steering components. Those issues matter with any of the Century’s 14-inch radial sizes.

A car that sits lower than original or uses replacement wheels should be checked carefully before changing tires. The practical step is to confirm actual wheel diameter and width, inspect clearance at full steering lock, and compare the current setup to the intended tire. That is especially important when moving between different Century sub-model fitments or replacing long-installed older tires.

Before driving a 1978 Buick Century on new tires, inspect the wheels for correct diameter and sound condition, confirm the tire size matches the car’s sub-model, and check that the tires are mounted and inflated properly. It also helps to verify valve stems, lug hardware, and basic clearance around the suspension, inner fenders, and steering components.

A collector car that has spent time parked deserves extra attention after installation. Look for uneven ride height, signs of rubbing, and any air loss after the first few drives. It is also wise to recheck pressure and wheel fastener torque once the tires have been run, since that follow-up can catch small issues before they become roadside problems.

Tires on a collector 1978 Buick Century should be maintained with regular pressure checks, routine visual inspection, and careful storage habits. Even if the car is driven lightly, the tires should be watched for cracking, bulges, cuts, tread wear, and slow air loss. Low annual mileage does not prevent age-related tire issues.

Good storage makes a real difference on a classic Buick. Keeping the car away from prolonged sunlight, excess heat, moisture, and ozone sources helps preserve the sidewalls and overall condition. The car should also be inspected before longer drives, because a Century that spends most of its time parked can hide tire problems until the first highway outing.