The 1991 Pontiac Grand Prix sits in an interesting moment for Pontiac performance and personal-coupe design, carrying the rounded W-body look that defined much of the division’s early-1990s street presence. Depending on trim, this car could lean sporty, touring-oriented, or more appearance-conscious, and the tire fitment reflects that split. This Grand Prix uses four primary radial sizes across its sub-model range: 205/70R15, 215/60R15, 215/60R16, and 225/60R16. Available choices include blackwall, whitewall, redline, raised yellow letter, and raised white letter styles across several tire series and brands. The key is matching the exact sub-model and wheel diameter first, then choosing the tire look and construction details that suit the car’s intended use.
Which Tire Size Is Right for The 1991 Pontiac Grand Prix
The 1991 Pontiac Grand Prix uses four primary tire sizes, and the right one depends on the exact sub-model and wheel diameter. Both 15-inch and 16-inch rims appear across the range, so confirming the car’s trim and actual wheel setup is the first step. Once that is settled, the decision shifts to sidewall style, tire series, brand, and whether a more traditional or more performance-oriented radial best matches the car.
The 215/60R15 size is a metric radial format: 215 is the nominal section width in millimeters, 60 is the aspect ratio, R identifies radial construction, and 15 is the rim diameter in inches. On the 1991 Pontiac Grand Prix, this size supports a lower-profile 15-inch setup than the taller 205/70R15 fitment. Available choices include blackwall, wide whitewall, redline, and raised white letter styles from brands such as American Classic, BFGoodrich, Dunlop, Avon, and Vredestein. It is a useful size for buyers who have confirmed the correct 15-inch wheel package and want to balance appearance, road use, and period-minded style.
The 225/60R16 size uses a modern metric radial format, with a 225-millimeter nominal section width, a 60-series profile, radial construction, and a 16-inch rim. Within the 1991 Pontiac Grand Prix range, this size belongs to a specific 16-inch performance-oriented fitment rather than the full model line. Product choices include raised yellow letter, redline, pin-white-stripe, wide whitewall, and narrow whitewall versions from Goodyear, BFGoodrich, and Travelstar. Buyers considering this size should confirm the wheel diameter first, then compare the sidewall presentation and rim-width suitability that best match the car’s trim and intended look.
The 205/70R15 code denotes a metric radial tire with a 205-millimeter nominal section width, a 70-series profile, and a 15-inch rim diameter. On the 1991 Pontiac Grand Prix, this size serves trims that use a taller-profile 15-inch radial than the 215/60R15 setup. Choices range from blackwall and narrow whitewall to wide whitewall, with offerings from Maxxis, Michelin, Avon, American Classic, Coker Classic, Dunlop, Tornel, and Travelstar across several tire series. This size deserves close attention from buyers who want the right ride profile for a 15-inch wheel while still choosing among restoration-style and road-use-oriented radial options.
The 215/60R16 size follows the same metric radial convention, pairing a 215-millimeter nominal section width with a 60-series profile on a 16-inch rim. In the 1991 Pontiac Grand Prix lineup, this is a trim-specific 16-inch fitment rather than a universal size for every version. The most important practical point is verifying that the car actually uses the correct 16-inch wheel package before comparing tires in this specification. Buyers selecting this size should focus on trim-level fitment first and then review the product options rendered for this wheel diameter and profile combination.
Sub-model fitment matters on the 1991 Pontiac Grand Prix because tire size changes across the range and includes both 15-inch and 16-inch wheel packages. Identifying the exact trim is the easiest way to avoid choosing the wrong profile or rim diameter before comparing tire styles and product options.
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1991 Pontiac Grand Prix GT
The 1991 Pontiac Grand Prix GT uses a 15-inch radial fitment built around the 215/60R15 size. That makes the buying decision less about multiple primary sizes and more about choosing the right sidewall treatment, tire series, and road-use character within that specification.
The 1991 Pontiac Grand Prix GT w/GTP Pkg. uses the 225/60R16 radial size on a 16-inch wheel. Confirming that wheel diameter first is essential, after which the choice shifts toward sidewall presentation and the overall look you want from a 16-inch Grand Prix setup.
The 1991 Pontiac Grand Prix LE uses the 205/70R15 radial size, giving it a taller-profile 15-inch fitment than some other trims in the lineup. That opens the door to several whitewall and blackwall choices, depending on whether the goal is a more formal appearance or straightforward road use.
The 1991 Pontiac Grand Prix SE can use either a 205/70R15 or a 215/60R16 radial tire, so wheel diameter has to be verified before selecting a replacement. Once the actual setup is confirmed, the choice becomes much more straightforward and can be narrowed by sidewall style and intended appearance.
The 1991 Pontiac Grand Prix STE uses the 215/60R16 radial size on a 16-inch rim. That makes correct wheel confirmation the first priority, followed by choosing a tire that fits the car’s intended presentation and general driving use.
The tire sizes listed on this page assume factory-standard vehicle configuration. The following modifications may affect tire fitment and are not reflected in this guide:
Suspension changes (lowering, lift kits, spring replacements)
Body alterations (fender modifications, custom bodywork)
If your vehicle has been modified from factory specifications, verify tire clearance before purchase.
Best 1991 Pontiac Grand Prix Tires for Sale
Available 1991 Pontiac Grand Prix tires span 15-inch and 16-inch radial sizes from American Classic, BFGoodrich, Dunlop, Avon, Vredestein, Goodyear, Michelin, Maxxis, Travelstar, Tornel, and Coker Classic. Depending on size, buyers can compare blackwall, whitewall, redline, raised white letter, and raised yellow letter styles across several distinct tire series.
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Radial Tires
American Classic Radial | 2 Inch Whitewall | 215/60R15
These 1991 Pontiac Grand Prix tire FAQs focus on the questions that matter most once the exact trim is known: size, rim diameter, sidewall style, brand and series differences, and the basic checks to make before road use.
Tire Size & Fitment
What tire size fits a 1991 Pontiac Grand Prix?
A 1991 Pontiac Grand Prix can use 205/70R15, 215/60R15, 215/60R16, or 225/60R16, depending on the sub-model. The LE uses 205/70R15, the GT uses 215/60R15, the GT w/GTP Pkg. uses 225/60R16, the STE uses 215/60R16, and the SE can use either 205/70R15 or 215/60R16.
The practical takeaway is that trim identification and wheel diameter matter before anything else. A Grand Prix with 15-inch wheels will not use the same tire as one fitted with 16-inch wheels, and the SE especially deserves a close look at the actual setup on the car before choosing a replacement tire.
What size rim does a 1991 Pontiac Grand Prix use?
The 1991 Pontiac Grand Prix uses either a 15-inch or 16-inch rim, depending on sub-model and tire size. The 205/70R15 and 215/60R15 sizes belong to 15-inch wheels, while 215/60R16 and 225/60R16 belong to 16-inch wheels.
That makes rim diameter one of the most important checks before ordering tires, especially on a car that may have had wheels changed over the years. Looking at the tire sidewall and confirming the actual wheel on the car helps prevent mixing a correct trim-based size with the wrong rim diameter.
Why does the 1991 Pontiac Grand Prix have more than one tire size?
The 1991 Pontiac Grand Prix has more than one tire size because Pontiac used different wheel and tire packages across the GT, GT w/GTP Pkg., LE, SE, and STE sub-models. Those packages include both 15-inch and 16-inch rims, along with different tire profiles to suit each configuration.
That variation means the model name alone is not enough when selecting a tire. The best approach is to confirm the exact sub-model and then verify the wheels currently on the car, since an SE in particular may use one of two primary sizes depending on its wheel package.
Choosing the Right Tire
What should I consider when choosing a tire for a 1991 Pontiac Grand Prix?
Start with the correct tire size for the exact Grand Prix sub-model and wheel diameter, then compare the style and character of the available radial options in that size. Depending on the fitment, choices may include blackwall, narrow whitewall, wide whitewall, redline, raised white letter, or raised yellow letter tires.
After the size is settled, look at details such as tire series, rim-width suitability, load figures where shown, and whether the car is meant to present as sporty, formal, or restoration-minded. A GT, LE, or STE can all point the buyer toward a different visual result even before road use enters the picture.
What sidewall styles are available for 1991 Pontiac Grand Prix tires?
Sidewall choices for 1991 Pontiac Grand Prix tires include blackwall, narrow whitewall, wide whitewall, redline, raised white letter, and raised yellow letter, depending on the tire size. Not every style appears in every fitment, so the available look changes with the specific 15-inch or 16-inch size being considered.
That makes the tire’s appearance a secondary decision after fitment, not before it. A buyer looking for a cleaner sport look may prefer blackwall or lettered sidewalls, while a more formal or restoration-oriented Grand Prix may call for one of the whitewall treatments offered in the correct size.
What brands offer tires for the 1991 Pontiac Grand Prix?
Tires for the 1991 Pontiac Grand Prix are available from American Classic, BFGoodrich, Dunlop, Avon, Vredestein, Goodyear, Michelin, Maxxis, Travelstar, Tornel, and Coker Classic, depending on size. Brand availability changes by fitment, so the exact list will be broader in some sizes than in others.
Brand choice should come after confirming the correct size and wheel diameter for the car. Once that is established, comparing brands by tire series, sidewall style, rim-width specification, and the kind of look you want is more useful than choosing by name alone.
Restoration & Appearance
Which tire should I choose for a period-style 1991 Pontiac Grand Prix?
A period-style 1991 Pontiac Grand Prix tire starts with the correct trim-based size, then narrows to the sidewall and tread presentation that best fits the car’s character. Whitewall, redline, blackwall, raised white letter, and raised yellow letter options are all available across the Grand Prix fitments.
For a cleaner restoration-minded appearance, many buyers focus on how the car is being presented rather than chasing a single universal answer. Matching the right size first and then selecting a sidewall style that suits the trim, wheel package, and era feel will usually produce a more convincing result.
Does correct tire fitment matter for a 1991 Pontiac Grand Prix restoration?
Correct tire fitment matters on a 1991 Pontiac Grand Prix restoration because the model uses more than one wheel diameter and more than one profile across its sub-model range. Choosing the wrong size can change the stance of the car and move it away from the trim-specific look Pontiac intended.
A careful restoration should confirm the exact sub-model and the actual wheels on the car before choosing sidewall treatment or brand. Once the fitment is right, visual details such as whitewall width, redline treatment, or lettered sidewalls can be selected to support the car’s overall presentation.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1991 Pontiac Grand Prix?
Yes, modifications can affect tire fitment on a 1991 Pontiac Grand Prix. If the car has aftermarket wheels, suspension changes, altered ride height, or body modifications, the original trim-based tire size may no longer tell the whole story even if the sidewall size still looks close at a glance.
Checking wheel diameter, wheel width, and available clearance at the fender and steering stops is especially important before changing profile or returning the car to a stock-style size. A modified SE, GT, or STE should be inspected carefully so the chosen tire matches the wheel and the space available around it.
What should I inspect before driving a 1991 Pontiac Grand Prix on new tires?
Before driving a 1991 Pontiac Grand Prix on new tires, inspect the wheels for correct diameter and condition, verify inflation pressure, and make sure the tires clear the suspension, steering components, and bodywork. It also helps to look over the valve stems, lug hardware, and overall wheel mounting condition.
A short, careful first drive is a smart follow-up after installation, especially on a car with older suspension parts or uncertain wheel history. Listening for rubbing and rechecking pressure after the initial miles can catch small issues early before the tires settle into regular use.
How often should tires on a 1991 Pontiac Grand Prix be inspected?
Tires on a 1991 Pontiac Grand Prix should be inspected regularly, especially if the car is collector-kept or driven infrequently. A visual check for cracking, bulges, cuts, unusual wear, and air loss is worthwhile before routine use, and a more thorough inspection makes sense before any longer drive.
Low-use cars often age tires out before they wear them out, so tread depth alone is not enough. Paying attention to sidewall condition, storage environment, and any vibration or pull on the road helps catch problems early and keeps the Grand Prix ready for dependable occasional use.
