1991 Buick Tire Fitment Guide

1991 Buick vehicles use 11 radial tire sizes across the model range: 185/80R13, 185/75R14, 195/75R14, 205/75R14, 205/70R14, 215/60R14, 205/70R15, 215/65R15, 225/75R15, 215/60R16, and 225/60R16. Century uses 185/75R14 and 195/75R14; LeSabre uses 205/75R14 and 215/65R15; Park Avenue uses 205/70R15 and 215/65R15; Reatta uses 215/60R16; Regal uses 205/70R14, 205/70R15, and 225/60R16; Riviera uses 205/70R15 and 215/65R15; Roadmaster uses 225/75R15; Skylark uses 185/80R13, 185/75R14, and 215/60R14.

The practical takeaway is that year and make alone are not enough for a 1991 Buick. You need the exact model, and in several cases you also need to verify whether the car has 13-, 14-, 15-, or 16-inch wheels. Rim-width coverage also varies by size: for example, 185/75R14 spans roughly 4.50 to 7.50 inches depending on tire, 205/70R15 spans 5.00 to 7.50 inches, and 225/60R16 spans 6.00 to 9.00 inches. Matching the tire size to the model and then confirming wheel width against the specific tire’s approved range is the cleanest way to avoid fitment mistakes.

On a 1991 Buick, 185/75R14 is a metric radial size. The 185 is the nominal section width in millimeters, 75 is the aspect ratio, the R means radial construction, and 14 is the wheel diameter in inches. Within the 1991 Buick range, this size appears on the Century and Skylark rather than across the entire lineup.

That code matters because it tells you both the wheel diameter and the general tire profile before you even compare brands. In this size, the visual treatment stays traditional, with narrow whitewall choices from several brands, while some versions also carry an S speed rating with a 112 mph ceiling. If your Buick wears 14-inch wheels and falls into the Century or Skylark applications that use this size, the next step is checking wheel width and deciding whether you want a subtle stock-style whitewall appearance or a particular brand family.

No, 1991 Buick models do not use the same tire size. The lineup ranges from 13-inch Skylark fitments to 16-inch Reatta and Regal fitments, with many 14-inch and 15-inch sizes in between. A few sizes are shared across multiple models, such as 215/65R15 for LeSabre, Park Avenue, and Riviera, and 205/70R15 for Park Avenue, Regal, and Riviera, but many sizes belong to only one model.

That means model identification is the first filter, especially on Buicks that had more than one wheel-and-tire package within the same nameplate. Regal, Skylark, Century, LeSabre, and Park Avenue each appear with multiple fitments, so a quick check of the car’s existing tire sidewall or wheel diameter can prevent ordering the right-looking tire in the wrong size. Shared sizes can simplify the search, but they do not make every 1991 Buick interchangeable.

1991 Buick tires cover a wide spread of sidewall styles depending on size. Traditional choices include narrow whitewall and wide whitewall, while more performance-oriented late-model looks include blackwall, RWL, OWL, raised yellow letter, redline, dual redline, and pin white stripe. The whitewall-heavy sizes tend to appear on Century, LeSabre, Roadmaster, and some Skylark, Park Avenue, and Riviera applications, while Regal and certain 15- and 16-inch Buick sizes open the door to more assertive sidewall treatments.

For a Buick of this era, the right sidewall is often as much about the car’s personality as the numeric size itself. Formal luxury sedans and traditional full-size cars usually look most at home with whitewalls, while sportier coupes and appearance-package cars can suit RWL, redline, or blackwall styles better. If originality matters, use the era and the model’s market position as your guide, then confirm that the sidewall treatment you want is offered in the exact size your Buick uses.

Tires for 1991 Buick vehicles come from Tornel, Maxxis, Travelstar, Coker Classic, American Classic, Goodyear, Cooper, BFGoodrich, Michelin, and Avon. Brand coverage varies by size: 185/75R14 draws from Tornel, Maxxis, and Travelstar; 215/65R15 includes Goodyear, Cooper, and BFGoodrich; 205/70R15 includes Maxxis, Michelin, Avon, and American Classic; 225/75R15 includes BFGoodrich, Coker Classic, and American Classic. Some sizes stay tightly focused, while others have a broader mix of whitewall, blackwall, and performance-style offerings.

The best way to use brand choice on a 1991 Buick is to start with the correct size and then compare the visual character and service intent of the available tires. A Roadmaster owner may naturally gravitate toward a whitewall-oriented brand family, while a Regal owner chasing a more period performance look may prefer RWL, blackwall, or redline treatments. Brand matters, but on this Buick lineup, size and sidewall style usually narrow the field first.

For 1991 Buick applications that use 205/70R15, Michelin XWX and Avon CR6ZZ are both blackwall radials, but they are not identical. The Michelin XWX carries a 90W marking with a 168 mph speed ceiling and uses a 15-inch rim with an approved width range of 5.50 to 7.50 inches. The Avon CR6ZZ carries a 96V marking with a 149 mph speed ceiling and fits a 15-inch rim with an approved width range of 5.0 to 7.0 inches.

That difference makes the choice more about the car’s intended look and wheel setup than about simple size compatibility. Both suit buyers who want a blackwall presentation in a 205/70R15 Buick application, but their speed symbols and wheel-width windows are not the same. If your 1991 Buick uses 205/70R15, confirm the actual wheel width first, then decide whether the visual character and technical envelope of the Michelin or Avon better matches your car.

Rim width depends on the exact tire size used on the 1991 Buick. 185/75R14 covers roughly 4.50 to 7.50 inches depending on tire, 195/75R14 spans 5.00 to 7.00 inches on some versions, 205/75R14 runs from 5.00 to 7.50 inches, 215/65R15 covers about 5.50 to 7.50 inches, 205/70R15 covers 5.00 to 7.50 inches, 205/70R14 covers 5.00 to 7.50 inches, 225/60R16 covers 6.00 to 9.00 inches, 225/75R15 covers 6.00 to 8.00 inches, 185/80R13 covers 5.00 to 6.50 inches, and 215/60R14 covers 6.00 to 7.50 inches.

Those ranges show why wheel width should be checked alongside wheel diameter, especially on cars that may have changed wheels over the years. Two tires can share the same diameter and general profile while having different approved rim-width windows from brand to brand. If your 1991 Buick has aftermarket wheels or a trim-dependent wheel package, verify the wheel’s actual width before settling on a tire, particularly in the Regal, Skylark, LeSabre, and Park Avenue applications that span multiple sizes.

1991 Buick fitments in this group are radial passenger-car sizes, and the products shown here are not marked as tube-type. One 205/70R15 Michelin XWX is explicitly marked TL for tubeless, while the rest are presented as modern radial constructions without TT markings. That points buyers toward tubeless tire applications rather than old-style tube-type fitments.

The important detail is that tubeless-capable tires still need sound wheels, good valve stems, and clean bead seats to seal properly. If a 1991 Buick has original wheels that have seen decades of corrosion, refinishing work, or long storage, inspect the wheels carefully before mounting new tires. Tube decisions should follow the wheel’s condition and the manufacturer’s marking on the exact tire, not a blanket assumption carried over from much older collector vehicles.

A 1991 Buick stores best on clean, properly inflated tires in a cool, dry, dark space away from electric motors, welders, battery chargers, and other ozone-producing equipment. Keep the car out of direct sunlight and off damp ground, and move it periodically so one section of each tire is not carrying the same load month after month. These are all radial fitments, so they generally resist long-term flat-spotting better than vintage bias-ply tires, but long static storage is still hard on rubber.

For a collector Buick that sits through part of the year, storage habits affect appearance as much as safety. Whitewalls, redlines, and raised-letter sidewalls can discolor or age unevenly if they stay exposed to UV and ozone. If the car will remain parked for an extended period, some owners prefer stands under the chassis to reduce sustained load, though the suspension should still be supported thoughtfully. A little seasonal attention goes a long way toward preserving both ride quality and sidewall finish.

On a 1991 Buick, tire age matters more than mileage for many owners because these cars are often driven seasonally or only on fair-weather trips. A practical rule is to begin close annual evaluation once tires reach about five to seven years of age, and to treat roughly ten years as a serious replacement point regardless of remaining tread. The DOT date code on the sidewall is the quickest way to establish true tire age.

Collector cars can fool owners because a tire may still look decent from ten feet away while the rubber has already hardened or begun to crack with age. That matters on luxury Buicks and coupes alike, since a quiet ride and stable highway behavior depend on pliable, healthy tires. If your 1991 Buick spends more time parked than driven, judge the tire by calendar age, condition, and storage history first, and tread depth second.

Tires on a 1991 Buick should be inspected before every drive, and more thoroughly before any longer outing or highway trip. Look for sidewall cracking, uneven wear, cuts, bulges, objects in the tread, and any sign that the tire is losing pressure between drives. On cars that see infrequent use, also check the spare, since a neglected spare can be the oldest tire on the car.

Routine inspection matters because a low-use Buick can spend months in the garage and then be asked to run at interstate speeds on the first sunny weekend. A quick walk-around is not enough if the car has been sitting; use a pressure gauge and put eyes on both outer sidewalls and tread surfaces. If the Buick has older wheels or recently mounted tires, keep an eye on valve stems and bead sealing as well, since slow leaks often appear there first.

A 1991 Buick Century originally belonged to the era when radial construction was standard American passenger-car practice, and the Century fitments here reflect that with 185/75R14 and 195/75R14 radial sizes. Whitewall treatments remained very much part of Buick’s identity in this period, especially on comfort-oriented mainstream and premium models. That makes a radial with an appropriate whitewall style a historically sensible direction for many Century restorations.

Original fitment details can still vary by trim, wheel package, and market, so an owner pursuing exact factory accuracy should compare the car’s surviving tire placard, owner’s literature, and period Buick brochures. For judged restoration work, the main questions are usually whether the size is correct, whether the tire is radial as expected for the era, and whether the sidewall treatment looks right for the specific Century being restored. A Buick marque specialist can help settle trim-specific details.

Correct tire fitment absolutely matters when showing a 1991 Buick, especially if the event emphasizes factory appearance and authenticity. Judges and knowledgeable enthusiasts will notice whether the size suits the model, whether the wheel diameter matches the car’s original type of fitment, and whether the sidewall style fits the Buick’s intended character. On a car from 1991, a mismatched whitewall width or an overtly performance-style sidewall on a formal luxury model can stand out quickly.

The level of scrutiny depends on the event. A local cruise night may reward overall presentation, while marque judging can be far more particular about size, profile, and sidewall treatment. For that reason, a Roadmaster, Park Avenue, or Riviera restored toward factory appearance may call for a different visual tire choice than a Regal or Skylark with sport-oriented period flavor. Event rules and Buick club guidance are the best final authority before a concours-level tire decision.

For a 1991 Buick Roadmaster using 225/75R15, BFGoodrich Silvertown Radial and Coker Classic Star Series approach the same size with different sidewall treatments and load figures. BFGoodrich Silvertown Radial appears in a 2.75-inch wide whitewall and also in a 1.6-inch narrow whitewall, with a stated load capacity of 1,874 pounds at 35 psi on the examples here. Coker Classic Star Series appears in both 2.75-inch wide whitewall and 1.60-inch narrow whitewall, with a stated load capacity of 2,094 pounds at 32 psi.

That makes the comparison especially useful for a Roadmaster owner balancing visual authenticity, pressure preference, and the exact stance they want from a big Buick. Both cover the traditional whitewall look that suits the car, but they are not the same tire with a different name on the sidewall. If your Roadmaster is being restored for appearance, compare whitewall width first; if it is expected to travel regularly, also consider the tire’s rated load-and-pressure pairing and approved wheel-width range.

1991 Buick tire options here are all radial constructions, which is favorable for modern road use, and several sizes include speed-rated products. Examples include S-rated versions at 112 mph in sizes such as 185/75R14, 205/70R14, 215/65R15, and 215/60R14, a V-rated 205/70R15 at 149 mph, and a W-rated 205/70R15 at 168 mph. Those figures are well above normal U.S. highway speeds, though one tire’s speed symbol should never be treated as permission to exceed the car’s mechanical comfort zone.

For a 1991 Buick, the larger safety question is often the total condition of the car rather than the raw speed letter on the sidewall. Suspension wear, brake condition, alignment, and age-hardened bushings can influence highway behavior as much as the tire itself, especially on heavier luxury models. If the tires are fresh, properly inflated, and matched to the correct model and wheel, highway use is reasonable, but the whole car still needs to be ready for sustained-speed driving.

Inflation pressure on a 1991 Buick should start with the car’s factory recommendation, then be checked against the tire’s own rated load-and-pressure information. The tire range here includes examples such as 185/75R14 around 35 to 44 psi depending on product, 195/75R14 at 32 to 35 psi, 205/75R14 at 35 psi, 215/65R15 at 35 psi, 205/70R15 at 35 psi on load-rated examples, 225/60R16 at 34 to 44 psi depending on product, 225/75R15 at 32 to 35 psi, 185/80R13 at 32 to 35 psi, and 215/60R14 at 35 psi.

Those figures are tire ratings, not a universal instruction to inflate every 1991 Buick to the same number. A Roadmaster, Reatta, and Skylark place very different demands on their tires, and even within one size, two products may carry different pressure-and-load pairings. Use the Buick placard or owner’s manual as your baseline for street use, then make sure the chosen tire is being used within its own limits. Never transfer a pressure habit from one Buick model or tire size to another.

Before a longer drive in a 1991 Buick, inspect each tire for cracking, cuts, punctures, tread separation, bulges, uneven wear, and proper cold inflation pressure. Check that the spare is usable, confirm the valve stems are in good condition, and look for signs of slow leakage if the car has been parked for weeks. On cars with whitewalls, redlines, or raised-letter tires, take a close look at the visible sidewall rather than relying on tread appearance alone.

A longer trip is also the time to think beyond the tires. A 1991 Buick may still have aging suspension parts, brake hoses, cooling-system components, or wheel bearings that have not been stressed recently. Tire condition is only one piece of roadworthiness, but it is one of the easiest to evaluate before leaving home. If the Buick has recently been awakened from storage, drive it locally first and confirm that pressure, steering feel, and ride behavior remain stable before committing to distance.