The 1991 Porsche 911 sits in the 964 era, a point where the rear-engine 911 had evolved into a more refined road car without losing the shape and balance that define the model. Carrera 2, Carrera 4, and Turbo versions each carry that same unmistakable identity, but tire fitment depends on whether the car uses a 16-inch or 17-inch wheel setup and whether you are selecting front or rear sizes. The primary fitments are modern metric radials, with staggered sizing across the model range. Available choices include blackwall performance-oriented tires along with a few wide whitewall options for a more customized presentation, so selection should start with wheel diameter and axle position.
Which Tire Size Is Right for The 1991 Porsche 911
The 1991 Porsche 911 uses four primary tire sizes, and the correct choice depends first on wheel diameter and then on whether you are selecting a front or rear tire. Both 16-inch and 17-inch radial fitments appear across Carrera 2, Carrera 4, and Turbo applications, so confirming the exact wheel setup on the car is the first step before comparing brands, series, or sidewall style.
Fit(s): Carrera 2 Front, Carrera 4 Front, and Turbo Front
Construction: Radial|Rim: 17 in
In 205/50R17, the 205 is the nominal section width in millimeters, 50 is the aspect ratio, R identifies radial construction, and 17 is the rim diameter in inches. On the 1991 Porsche 911, this is a front fitment used with 17-inch wheels, including Turbo front applications, and it reflects the lower-profile stance associated with later 911 wheel packages. Product choices include BFGoodrich, American Classic, and Vredestein, with mostly blackwall styling plus a wide whitewall option. This size should be evaluated by owners who have confirmed a 17-inch front wheel and want to compare period-sympathetic appearance against modern performance-oriented tire lines.
In 205/55R16, the 205 is the nominal section width in millimeters, 55 is the aspect ratio, R means radial, and 16 is the wheel diameter in inches. This size serves as a front fitment on 16-inch wheel setups for 1991 Porsche 911 Carrera 2 and Carrera 4 models, making it the right starting point for cars that retain the 16-inch front arrangement. Available options include BFGoodrich, Michelin, and American Classic products, largely in blackwall form with a wide whitewall alternative also available. It is the useful choice to consider when preserving the 16-inch front setup matters more than moving to the later 17-inch package.
In 225/50R16, the 225 is the nominal section width in millimeters, 50 is the aspect ratio, R denotes radial construction, and 16 is the rim diameter in inches. For the 1991 Porsche 911, this size is used on the rear of 16-inch Carrera 2 and Carrera 4 combinations, so it works as part of the staggered 16-inch setup rather than as a universal fitment. BFGoodrich and Michelin options are available in blackwall styles across several performance-oriented series. This is the size to review when the car retains its 16-inch rear wheels and the goal is to keep the intended front-to-rear size relationship intact.
Fit(s): Carrera 2 Rear, Carrera 4 Rear, and Turbo Rear
Construction: Radial|Rim: 17 in
In 255/40R17, the 255 is the nominal section width in millimeters, 40 is the aspect ratio, R indicates radial construction, and 17 is the rim diameter in inches. On the 1991 Porsche 911, this is a rear fitment for 17-inch applications and is used on Carrera 2, Carrera 4, and Turbo rear positions, giving it an important role in the broader 17-inch staggered setup. Choices include BFGoodrich, Nitto, and Vredestein in blackwall performance-oriented lines. Owners should focus on this size only after confirming the car has the matching 17-inch rear wheel, since width and rim-width compatibility matter more here than simple rim diameter alone.
Sub-model fitment on the 1991 Porsche 911 varies by axle position and wheel package rather than by a single all-around size. Checking whether the car is a Carrera 2, Carrera 4, or Turbo, and whether it carries 16-inch or 17-inch wheels, is the key step before selecting tires.
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1991 Porsche 911 Carrera 2 Front
The 1991 Porsche 911 Carrera 2 Front uses either a 205/55R16 or 205/50R17 radial, depending on the wheel package fitted to the car. Tire selection here starts with confirming front wheel diameter, then comparing available blackwall or wide whitewall options within the correct size.
The 1991 Porsche 911 Carrera 2 Rear uses either a 225/50R16 or 255/40R17 radial as part of a staggered rear fitment. That makes rear wheel confirmation especially important, since the correct choice depends on matching the rear tire to the car's actual wheel diameter and front-to-rear setup.
The 1991 Porsche 911 Carrera 4 Front follows the same front-size pattern as the Carrera 2, using either 205/55R16 or 205/50R17 radial tires. Once the wheel diameter is confirmed, the main decision becomes choosing among available tire series, brands, and sidewall treatments in that front size.
The 1991 Porsche 911 Carrera 4 Rear uses either 225/50R16 or 255/40R17 radials depending on the wheel setup. Keeping the rear size aligned with the car's actual wheel diameter and staggered arrangement is more important than simply matching a size that appears elsewhere in the 911 range.
The 1991 Porsche 911 Turbo Front uses a 205/50R17 radial tire. That makes front selection more straightforward on the Turbo, with the focus shifting from size identification to comparing available brands and tire character within the confirmed 17-inch front fitment.
The 1991 Porsche 911 Turbo Rear uses a 255/40R17 radial tire. Rear selection should center on the correct 17-inch wheel setup, appropriate rim-width compatibility, and the kind of performance-oriented blackwall tire presentation that suits the car's overall setup.
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 Porsche 911 Tires for Sale
Available 1991 Porsche 911 tire choices span 16-inch and 17-inch radial fitments from BFGoodrich, Michelin, Nitto, Vredestein, and American Classic. The main comparisons are between tire series, blackwall versus wide whitewall appearance, and rim-width compatibility across front and rear sizes.
These FAQs focus on 1991 Porsche 911 tire size selection, front and rear fitment, 16-inch versus 17-inch wheel setups, product choices, appearance considerations, and the inspection points that matter before road use.
Tire Size & Fitment
What tire size fits a 1991 Porsche 911?
A 1991 Porsche 911 uses four primary radial tire sizes: 205/50R17, 205/55R16, 225/50R16, and 255/40R17. The exact size depends on axle position and wheel package, with front and rear tires staggered rather than using one size at all four corners.
The first thing to confirm is whether the car has 16-inch or 17-inch wheels, then whether you are selecting a front or rear tire. Carrera 2 and Carrera 4 can use either 16-inch or 17-inch front and rear combinations, while the Turbo uses 205/50R17 front and 255/40R17 rear.
What size rim does a 1991 Porsche 911 use?
The 1991 Porsche 911 uses both 16-inch and 17-inch rim diameters, depending on the configuration. The 205/55R16 and 225/50R16 sizes mount on 16-inch wheels, while the 205/50R17 and 255/40R17 sizes mount on 17-inch wheels.
Because both wheel diameters appear on this model year, rim confirmation should come before tire shopping. Looking only at the car's model name is not enough, since Carrera 2 and Carrera 4 front and rear fitments can follow either package, and the tire must match both axle position and actual wheel diameter.
Why does the 1991 Porsche 911 have more than one tire size?
The 1991 Porsche 911 has more than one tire size because fitment changes by front versus rear position and by 16-inch versus 17-inch wheel setup. That creates staggered combinations, with narrower front sizes and wider rear sizes matched to specific wheel diameters.
This matters because choosing by year and model alone can still leave room for error. A front size cannot simply be substituted for a rear size, and a 16-inch tire cannot be used on a 17-inch wheel, so the correct approach is to verify the wheel package already on the car before comparing tire options.
Choosing the Right Tire
What should I consider when choosing a 1991 Porsche 911 tire?
Start with the correct size for the wheel diameter and axle position, since the 1991 Porsche 911 uses staggered front and rear radial fitments in both 16-inch and 17-inch configurations. After size is confirmed, compare tire construction details, rim-width compatibility, load figures where shown, and the overall character of the available tire series.
Appearance also plays a role, especially if the car is restored, personalized, or shown as well as driven. Most options are blackwall performance-oriented tires, but some front sizes are also available with wide whitewalls, so the right choice depends on whether the goal is performance character, traditional presentation, or a balanced road-use setup.
What sidewall styles are available for 1991 Porsche 911 tires?
1991 Porsche 911 tires are available primarily in blackwall form, with wide whitewall choices also appearing in some front sizes. Blackwall is the dominant presentation across the performance-oriented BFGoodrich, Michelin, Nitto, and Vredestein lines, while American Classic offers wide whitewall alternatives in certain fitments.
Sidewall style should be chosen after the correct size is established, not before. A whitewall option can change the visual character of the car significantly, but it is only useful if it is offered in the size that matches the Porsche's actual front or rear wheel and wheel-diameter setup.
What brands offer tires for the 1991 Porsche 911?
Tires for the 1991 Porsche 911 are available from BFGoodrich, Michelin, Nitto, Vredestein, and American Classic, depending on the size. Brand availability changes by fitment, so not every maker appears in every front and rear application across the 16-inch and 17-inch combinations.
That makes it helpful to narrow the search by exact size first and then compare the available brands within that fitment. Once the correct size is confirmed, the real decision becomes whether the car needs a blackwall performance-style tire, a more specialized series, or a wide whitewall presentation for a different visual effect.
Restoration & Appearance
Which tire should I choose for a period-style 1991 Porsche 911?
A period-style 1991 Porsche 911 tire choice starts with keeping the correct front and rear size relationship and the correct 16-inch or 17-inch wheel diameter for the car's setup. From there, blackwall radial tires usually maintain the most natural visual fit with the 964-era 911's original roadgoing character.
Tire series and sidewall treatment can change the car's appearance more than many owners expect. When originality matters at a detailed level, it is worth checking marque-club references or vehicle-specific historical documentation, since a size may be correct for the application without every available sidewall style matching a strict restoration goal.
How does tire construction affect the appearance of a restored 1991 Porsche 911?
The 1991 Porsche 911 uses radial tires, so construction choice is less about bias-ply versus radial appearance and more about how modern radial styling, sidewall treatment, and profile shape suit the car. Blackwall options keep a clean, performance-oriented presentation, while wide whitewalls create a far more customized visual statement.
Restoration-minded owners should look beyond size alone and consider how the tire's sidewall style fits the intended finish of the car. A wheel-correct radial in the right front or rear size preserves the proportions of the 911 more effectively than a visually dramatic sidewall treatment chosen without regard for the overall build theme.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1991 Porsche 911?
Yes, modifications can affect tire fitment on a 1991 Porsche 911. Aftermarket wheels, changes in wheel width, altered offsets, lowered suspension, or body changes can all influence whether the original 16-inch or 17-inch tire sizes still suit the car's actual front and rear setup.
A modified car should be checked at each corner before replacing tires by size alone. Wheel diameter is only the beginning, since clearance at the fender, suspension, and steering range can change when the car no longer matches its original wheel and suspension arrangement.
What should I inspect before driving a 1991 Porsche 911 on new tires?
Before driving a 1991 Porsche 911 on new tires, confirm that each tire matches the correct front or rear size, the correct wheel diameter, and the intended wheel position. It also helps to inspect wheel condition, valve stems, and overall mounting quality before taking the car out on the road.
A careful visual check should include sidewall clearance, tread-to-body clearance, and any signs of rubbing at full steering lock or under suspension movement. Tire pressure should also be set correctly for the application, and an alignment review is worthwhile if the previous tires showed uneven wear or the car has been sitting.
How should 1991 Porsche 911 tires be maintained?
1991 Porsche 911 tires should be maintained with regular pressure checks, routine visual inspections, and close attention to aging as well as tread wear. On a collector-driven car, tires can spend long periods parked, so sidewall cracking, flat-spotting, air loss, and age-related deterioration deserve as much attention as mileage.
Storage conditions matter, especially for a low-use 911. Keeping the car away from prolonged sunlight, excess heat, moisture, and ozone sources helps preserve tire condition, and periodic inspections are important even when the car is driven only occasionally because time and storage can affect a tire long before the tread is worn out.
