The 1991 Pontiac Firebird sits at an interesting point in F-body history, carrying the sharp, low-slung look of the third generation while ranging from everyday coupe duty to serious Formula and Trans Am performance. Tire choice on this car is closely tied to trim level, because the 1991 Pontiac Firebird uses three primary radial sizes: 215/65R15, 215/60R16, and 245/50R16. That means the decision is less about old bias-ply versus modern radial construction and more about matching the correct wheel diameter, stance, and sub-model setup. Sidewall treatment, tire series, and intended use all matter, especially on cars that have been restored, modified, or kept as collectors.
Which Tire Size Is Right for The 1991 Pontiac Firebird
The 1991 Pontiac Firebird uses three primary tire sizes, and the right one depends on the exact sub-model and wheel diameter. Both 15-inch and 16-inch wheel fitments are used, so the first step is confirming whether the car has the original wheel size for its trim or a later wheel change. Once that is settled, the choice becomes finding the right radial tire style, series, and appearance for how the car is driven and presented.
215/65R15 is a metric radial size in which 215 is the nominal section width in millimeters, 65 is the aspect ratio, R identifies radial construction, and 15 is the rim diameter in inches. On the 1991 Pontiac Firebird, this size suits the 15-inch wheel setup and keeps the selection focused on modern radial behavior rather than vintage construction decisions. Available choices include Goodyear, Cooper, and BFGoodrich offerings with OWL, RWL, Redline, and Wide Whitewall sidewall treatments across several tire series. It is the size to evaluate when the car retains the 15-inch arrangement and the owner wants the right mix of appearance and road manners.
245/50R16 is a metric radial size with a 245-millimeter nominal section width, a 50-series profile, radial construction, and a 16-inch rim diameter. On the 1991 Pontiac Firebird, this is the wider 16-inch fitment used on higher-performance configurations, so wheel diameter and width matter before any tire is selected. BFGoodrich options in this size center on blackwall g-Force series tires, giving the buyer a more performance-oriented visual and specification range. This size deserves careful attention when matching a Formula, Trans Am, or Trans Am GTA setup to the actual wheels currently on the car.
215/60R16 is a metric radial size that uses a 215-millimeter nominal section width, a 60-series profile, and a 16-inch rim diameter. On the 1991 Pontiac Firebird, it appears as a 16-inch fitment but serves a different role than the wider 245/50R16, so it should not be chosen by wheel diameter alone. The key here is confirming which Trans Am configuration the car actually uses and whether the present wheel and tire combination matches that setup. This size is most relevant when preserving the intended fitment balance of a specific Trans Am arrangement rather than simply filling a 16-inch wheel opening.
Sub-model fitment matters on the 1991 Pontiac Firebird because tire size changes across the range. Base, Formula, Trans Am, and Trans Am GTA configurations do not all share the same wheel and tire setup, so identifying the exact sub-model is the first step before comparing products.
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1991 Pontiac Firebird Base
The 1991 Pontiac Firebird Base uses the 215/65R15 radial size on a 15-inch wheel setup. Tire selection here is mostly about choosing the right radial series and sidewall presentation while making sure the car still has the correct wheel diameter.
The 1991 Pontiac Firebird Formula uses the 245/50R16 radial size. That makes wheel confirmation especially important, since this fitment carries a different profile and width than the Base model and points the buyer toward blackwall performance-oriented choices.
The 1991 Pontiac Firebird Trans Am can use either 215/60R16 or 245/50R16, so this is the sub-model where exact configuration matters most. Tire selection starts with confirming which 16-inch wheel and tire package is on the car before comparing products or replacing a matched set.
The 1991 Pontiac Firebird Trans Am GTA uses the 245/50R16 radial size. Buyers should focus on matching that wider 16-inch fitment to the current wheel setup and then choosing among the available blackwall radial performance tire options.
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 Firebird Tires for Sale
Available 1991 Pontiac Firebird tire choices vary by size, brand, series, and sidewall treatment. The 215/65R15 fitment includes Goodyear, Cooper, and BFGoodrich options with OWL, RWL, Redline, and Wide Whitewall styles, while 245/50R16 centers on BFGoodrich g-Force blackwall performance radials.
Common 1991 Pontiac Firebird tire questions usually come down to sub-model fitment, 15-inch versus 16-inch wheels, radial size interpretation, sidewall and series choices, and the checks worth making before putting a restored or modified car back on the road.
Tire Size & Fitment
What tire size fits a 1991 Pontiac Firebird?
The 1991 Pontiac Firebird uses three primary radial sizes: 215/65R15, 215/60R16, and 245/50R16. The Base model uses 215/65R15, the Formula uses 245/50R16, the Trans Am uses either 215/60R16 or 245/50R16, and the Trans Am GTA uses 245/50R16.
That means the first step is identifying the exact sub-model and confirming whether the car still has its intended wheel diameter. A Firebird that has had wheels changed over the years may no longer match its original trim-based setup, so checking the actual wheel size on the car is just as important as knowing the model name.
What size rim does a 1991 Pontiac Firebird use?
A 1991 Pontiac Firebird uses either a 15-inch or 16-inch rim, depending on the sub-model and tire size. The 215/65R15 fitment uses a 15-inch rim, while both 215/60R16 and 245/50R16 use a 16-inch rim.
Because two rim diameters are involved, rim confirmation should happen before any replacement tire is chosen. A 16-inch tire cannot be mounted on a 15-inch wheel, and a 15-inch tire cannot be used on a 16-inch wheel, so checking the wheel itself is the quickest way to avoid ordering the wrong size.
Why does the 1991 Pontiac Firebird have more than one tire size?
The 1991 Pontiac Firebird has more than one tire size because the Base, Formula, Trans Am, and Trans Am GTA did not all use the same wheel and tire package. The range includes both 15-inch and 16-inch fitments, and the performance-oriented trims use different sizes than the standard Base model.
That variation means tire selection should follow the exact configuration of the car rather than the model name alone. The Trans Am is the most important example, since it can use either 215/60R16 or 245/50R16, so the existing wheel and tire setup should be checked before replacing a single tire or an entire set.
Choosing the Right Tire
What should I consider when choosing a 1991 Pontiac Firebird tire?
Start with the correct size for the specific sub-model and wheel diameter: 215/65R15, 215/60R16, or 245/50R16. From there, compare construction, rim-width compatibility, tire series, sidewall style, load figures where given, and the kind of road use the car actually sees.
A Base Firebird owner may care more about appearance choices such as OWL, RWL, Redline, or Wide Whitewall in 215/65R15, while a Formula or GTA owner may focus on the blackwall 245/50R16 performance options. Matching the tire to the car’s trim, wheels, and intended presentation usually leads to a better result than choosing by size alone.
What sidewall styles are available for 1991 Pontiac Firebird tires?
Sidewall styles vary by tire size on the 1991 Pontiac Firebird. In 215/65R15, available styles include OWL, RWL, Redline, and Wide Whitewall, while the 245/50R16 fitment is represented by blackwall BFGoodrich g-Force options.
That makes sidewall treatment an important part of the decision, especially on a Firebird that is being restored or presented with a specific period flavor. A more performance-oriented look may point toward blackwall or raised white letter styles, while a more customized or nostalgic presentation may lead toward Redline or whitewall choices.
What brands offer tires for the 1991 Pontiac Firebird?
Brand availability depends on the tire size used on the 1991 Pontiac Firebird. The 215/65R15 fitment is available from Goodyear, Cooper, and BFGoodrich, while the 245/50R16 fitment is represented by BFGoodrich products in the g-Force line.
The practical takeaway is that brand choice is broadest on the 15-inch Base-model size and more specialized on the wider 16-inch performance size. Once the correct size is confirmed, compare the available series, sidewall styles, and rim-width specifications instead of assuming every brand offers every Firebird fitment.
Restoration & Appearance
Which tire should I choose for a period-style 1991 Pontiac Firebird?
A period-style choice for a 1991 Pontiac Firebird starts with the correct trim-based size and wheel diameter, then moves to the visual character of the tire. On a Base model using 215/65R15, there is more room to tailor the look through series and sidewall options, while 245/50R16 choices lean toward a later performance blackwall presentation.
The best direction depends on whether the goal is a stock-appearing driver, a restored performance car, or a more personalized interpretation. Exact originality should be checked against vehicle-specific references and marque knowledge, because a size may be right for the car while a particular sidewall treatment reflects a different visual era.
How does tire construction affect the appearance of a restored 1991 Pontiac Firebird?
On the 1991 Pontiac Firebird, the primary fitments are radial sizes, so the construction question is less about bias-ply versus radial and more about how different radial tire designs present the car. Profile, sidewall treatment, and series name all influence whether the finished look feels understated, sporty, or more customized.
A Firebird restored around factory-era styling cues usually benefits from staying close to the correct size and wheel diameter before experimenting with sidewall details. Raised white lettering, blackwall, redline, or whitewall choices can change the visual impression quickly, even when the tire remains within the proper size family for the car.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1991 Pontiac Firebird?
Yes, modifications can affect tire fitment on a 1991 Pontiac Firebird. Aftermarket wheels, altered wheel width, suspension changes, lowering, and body or fender modifications can all change how a 215/65R15, 215/60R16, or 245/50R16 tire sits and clears the car.
Even when the tire size itself is correct for a Firebird trim level, the current setup may not match original wheel specs anymore. Measuring the actual wheel diameter and width, then checking steering clearance and fender space, is especially important before replacing only two tires or moving from one trim-style setup to another.
What should I inspect before driving a 1991 Pontiac Firebird on new tires?
Before driving a 1991 Pontiac Firebird on new tires, inspect the wheels for correct diameter and condition, confirm proper inflation, and check that the tires clear the fenders and suspension through full steering travel. It is also wise to look over the brakes, wheel bearings, and alignment if the car has been stored.
A Firebird that sits for long periods can develop issues that are not caused by the tires themselves, including flat-spotted old tires, worn bushings, or uneven alignment settings. Taking a few minutes to inspect the surrounding hardware helps the new tires wear correctly and reduces the chance of rubbing, pull, or vibration on the road.
How should tires on a collector 1991 Pontiac Firebird be maintained?
Tires on a collector 1991 Pontiac Firebird should be checked regularly for pressure, cracking, cuts, bulges, irregular wear, and signs of slow air loss. Cars that are driven occasionally need tire inspection just as much as daily drivers, because age and storage conditions can affect the rubber long before the tread looks worn out.
Storage habits matter on a low-use Firebird. Keeping the car away from prolonged sunlight, moisture, and ozone sources helps protect the sidewalls, and moving the car occasionally can reduce flat-spotting. Before any longer drive, give the tires a close visual inspection and confirm that all four still match the intended size and wheel setup.
