1958 Saab 92 & 93 Tires

The 1958 Saab 92 & 93 uses two primary 15-inch tire sizes: 145R15 in radial construction and 5.20-15 in bias-ply construction. Both sizes apply to the Base sub-model, so the main difference is not trim level but the type of tire construction and sizing format you want on the car.

That means the first decision is whether the car is being kept in a more traditional bias-ply configuration or set up for radial tires. It is smart to confirm the actual wheel size on the car, then compare the current wheel width, tire clearance, and intended use before choosing between the two fitments.

The 1958 Saab 92 & 93 uses a 15-inch rim diameter with both of its primary tire sizes. That applies whether the car is running the 5.20-15 bias-ply size or the 145R15 radial size, so rim diameter stays consistent even though the tire constructions differ.

Rim diameter is only part of the fitment picture, especially on a small vintage European car. Wheel width, tire construction, and the actual wheel currently installed should be checked before selecting a tire, particularly if the car has been updated over the years or is no longer running its earlier wheel and suspension setup.

A 5.20-15 tire is a numeric bias-ply size. The 5.20 refers to the nominal section width in inches, while the 15 refers to the rim diameter in inches. On the 1958 Saab 92 & 93, it represents the vintage-style bias-ply option rather than the Euro-metric radial alternative.

That older sizing format matters because it points to a different construction type and a different ownership goal. A buyer looking for traditional appearance and period-style tire character may lean toward 5.20-15, while someone planning more frequent road use may also want to compare the 145R15 radial and verify which setup suits the car’s present wheels.

For the 1958 Saab 92 & 93, 5.20-15 is a bias-ply tire size. It uses the older numeric sizing format commonly seen on vintage cars, and it differs from the 145R15 radial size that also applies to this model on a 15-inch rim.

That distinction affects both appearance and the overall tire-selection approach. Bias-ply tires suit owners who want a more traditional presentation, while a radial setup changes the construction type entirely. Before switching between them, check wheel width, tire clearance, and how the car will actually be driven instead of assuming the two constructions behave the same way.

Either construction can be relevant on a 1958 Saab 92 & 93, depending on how the car is being restored or driven. A 5.20-15 bias-ply keeps the tire choice in a traditional vintage format, while 145R15 gives the car a radial option on the same 15-inch wheel diameter.

The better choice depends on your priorities rather than a one-size-fits-all answer. A restoration-oriented owner may prefer the look and character of bias-ply tires, while an owner planning more regular road use may want to evaluate radial options. The car’s current wheel width, suspension condition, and clearance should be confirmed before settling on either approach.

A 1958 Saab 92 & 93 moving from 5.20-15 bias-ply tires to 145R15 radials should have its wheel diameter, wheel width, and general tire clearance checked first. Both sizes use a 15-inch rim, but that does not remove the need to verify how the radial tire suits the actual wheels on the car.

Conversion decisions should also account for suspension condition, steering clearance, and how the car sits under load or during turning. Many older cars have changed wheels over time, so it helps to inspect the full setup instead of choosing by size name alone. A careful fitment check matters more than assuming every 15-inch wheel arrangement will respond the same way.

Start with the correct primary size and construction type for the way the car is set up. The 1958 Saab 92 & 93 can use a 5.20-15 bias-ply tire or a 145R15 radial, so the choice begins with whether the goal is a traditional vintage presentation or a radial-based driving setup.

After that, compare the details that affect real-world fitment and appearance, including wheel width compatibility, sidewall style, tire series, and the condition of the car’s wheels and suspension. A small vintage Saab can be sensitive to setup changes, so matching the tire to both the car’s current hardware and the owner’s intended use is more important than choosing by looks alone.

Among the available 145R15 radial choices for the 1958 Saab 92 & 93, sidewall styles include blackwall and wide whitewall. Blackwall options appear in Firestone and Michelin radial offerings, while BFGoodrich offers a wide whitewall version in the same basic 145R15 fitment.

Sidewall style mainly affects visual character, especially on a restoration-minded car where the tire has a strong effect on stance and period feel. A blackwall tends to keep the presentation understated, while a wide whitewall creates a more styled vintage look. It still makes sense to confirm that the tire’s construction and wheel compatibility suit the car before choosing by appearance.

The available 145R15 radial options for the 1958 Saab 92 & 93 include Firestone, Michelin, and BFGoodrich. Those brands appear across different radial series, including Firestone F560 Radial, Michelin XZX, and BFGoodrich Silvertown Radial, giving buyers several ways to stay within the same basic tire size.

Brand choice should be considered alongside construction, sidewall style, and wheel compatibility rather than by name alone. One tire may suit a cleaner blackwall appearance, while another may better match a whitewall-focused build. The smartest comparison is between the actual specifications and presentation of each option that fits the car’s 15-inch wheel setup.

For a period-style 1958 Saab 92 & 93, the 5.20-15 bias-ply size is the natural starting point because it keeps the car in a vintage numeric bias-ply format. That construction generally aligns better with an early postwar European presentation than a later-style radial size, especially when authenticity of look matters more than a modernized setup.

Exact originality can be more specific than size and construction alone, so owners pursuing a highly accurate restoration should compare tire details against marque references or other period documentation. A radial option may still be appropriate for a road-driven car, but a bias-ply tire usually preserves the most traditional overall visual impression.

Tire construction changes more than driving feel on a restored 1958 Saab 92 & 93; it also changes the car’s visual presentation. A 5.20-15 bias-ply keeps the tire choice rooted in a vintage format, while a 145R15 radial gives the car a more modern construction even though both use the same 15-inch rim diameter.

That difference matters because tires are a visible part of the car’s stance and character. A restoration focused on period-style presentation often leans toward bias-ply construction, while a driver-oriented restoration may accept a radial for practical reasons. Sidewall treatment also influences the final look, especially when choosing between blackwall and wide whitewall radial options.

Yes, modifications can affect tire fitment on a 1958 Saab 92 & 93 even when the tire size itself is correct. Changes to wheel width, wheel offset, suspension height, steering components, or body clearance can all influence how a 145R15 radial or 5.20-15 bias-ply tire actually sits and functions on the car.

That is especially important on compact vintage cars, where clearance margins can be tighter than expected. A Saab that has aftermarket wheels, altered springs, or non-original suspension parts should be measured carefully before a tire is selected. Checking full lock steering clearance and fender room under compression helps prevent fitment surprises after installation.

Before driving a 1958 Saab 92 & 93 on new tires, inspect the wheels for condition and correct diameter, then confirm the tires are seated properly and inflated to an appropriate working pressure for the tire and vehicle setup. A quick visual check of valve stems, wheel hardware, and overall clearance is also worthwhile.

Road readiness on an older car involves more than the new tires themselves. Look over steering response, brake feel, and suspension condition, especially if the Saab has sat for long periods. A short low-speed test drive followed by another inspection can reveal rubbing, settling, or air-loss issues before the car is taken on a longer outing.

Tires on a collector 1958 Saab 92 & 93 should be kept properly inflated, inspected regularly for sidewall cracking, cuts, bulges, and uneven wear, and checked for air loss before each road outing. Low-mileage collector cars often age their tires through time and storage conditions rather than through heavy tread wear.

Storage habits matter almost as much as driving habits on an early Saab. Keeping the car away from prolonged sunlight, excess heat, moisture, and ozone sources helps preserve tire condition, whether the car runs bias-ply or radial tires. It also helps to look over the spare and rotate the car periodically so one spot is not carrying load for months.