1955 Porsche 356 A Tires

The 1955 Porsche 356 A is associated with two primary tire sizes: 560-15 in bias-ply construction and 155R15 in radial construction. Both sizes use a 15-inch rim, so the key difference is not wheel diameter but the tire’s sizing system and construction type.

That means the real choice is whether the car is staying with a traditional bias-ply setup or moving to a radial format. A careful selection should also take the actual wheel width, the car’s current suspension condition, and any prior modifications into account before settling on one size path.

The applicable tire sizes for the 1955 Porsche 356 A both use a 15-inch rim diameter. That applies to the 560-15 bias-ply fitment and the 155R15 radial fitment, so tire choice stays within the same basic wheel diameter.

Rim diameter is only part of the fitment picture on an early Porsche. The next step is confirming the actual wheel width on the car, since some radial and bias-ply options are intended for slightly different width ranges even when they share the same 15-inch diameter.

On a 1955 Porsche 356 A, 560-15 is a vintage numeric bias-ply size. The 560 indicates an approximate 5.60-inch nominal section width, while the 15 identifies the wheel diameter in inches.

That older size format reads differently from modern metric tires, so it helps to recognize that 560-15 is part of the tire’s period-style presentation as well as its fitment. Anyone considering a radial alternative should compare wheel width, overall tire dimensions, and body clearance rather than assuming every 15-inch tire behaves the same way.

For the 1955 Porsche 356 A, 560-15 is a bias-ply tire size. It is the traditional numeric fitment format and is offered in bias-ply construction with blackwall, narrow whitewall, and wide whitewall styles.

That matters because bias-ply construction affects both appearance and the way the car presents itself on the road. Owners choosing 560-15 usually focus on vintage look and feel, while anyone considering a radial instead should verify wheel width, tire dimensions, and clearance before making the change.

Radial equivalents for 560-15 include 155R15 as an 80-series metric radial and 560R15 as a bias-look radial equivalent. Both keep the car on a 15-inch rim, but they represent different approaches to updating the tire while staying close to the original size intent.

A recommended rim-width range of 4 to 5 inches applies to the equivalent conversion path, which makes wheel measurement important before choosing either option. Clearance around the fenders and suspension should also be checked, especially if the car has replacement wheels, altered ride height, or a non-stock alignment setup.

That decision depends on how the 1955 Porsche 356 A is being used and what the owner wants from the car. A 560-15 bias-ply tire keeps the vintage sizing convention and traditional look, while 155R15 provides a radial-format alternative on the same 15-inch rim diameter.

A restoration-oriented car may lean toward bias-ply for visual authenticity of presentation, while a regularly driven car may be evaluated around radial options. The important part is to make the change deliberately by checking wheel width, tire clearances, and the car’s actual setup rather than treating construction choice as cosmetic only.

Start with the correct size family and construction type. On a 1955 Porsche 356 A, that means deciding between 560-15 bias-ply and 155R15 radial, then narrowing the choice by rim-width compatibility, intended use, sidewall appearance, and the character of the tire series available in that size.

A car built around restoration appearance may call for a different choice than one used regularly on touring drives. It also helps to compare product details such as load figures where given, sidewall style, and whether the wheel on the car still matches the width range expected by the tire being considered.

The available sidewall styles for the 1955 Porsche 356 A include blackwall, narrow whitewall, and wide whitewall. Blackwall appears across both the 155R15 radial options and the 560-15 bias-ply range, while the whitewall treatments are part of the 560-15 bias-ply selection.

That gives the owner a meaningful appearance decision even before comparing brands. A blackwall tire usually supports a restrained sports-car look, while narrow or wide whitewalls create a more stylized period presentation, so the right choice depends on the car’s restoration direction and not simply the tire size alone.

Tires for the 1955 Porsche 356 A are available from Firestone, Michelin, Avon, Vredestein, US Royal, Coker Classic, and Pro-Trac. Those brands cover both of the vehicle’s size paths, with radial options centered around 155R15 and bias-ply options centered around 560-15.

Brand choice should be considered alongside construction, sidewall treatment, and tire series rather than by name alone. A buyer comparing options for this Porsche will get better results by matching the tire to the car’s use and appearance goals, then confirming the wheel and fitment details that matter for the chosen size.

For a period-style 1955 Porsche 356 A, the 560-15 bias-ply size is the natural starting point because it uses the vintage numeric format and retains the traditional tire construction associated with many restoration-minded selections. It is available in blackwall, narrow whitewall, and wide whitewall presentations.

That does not automatically make every 560-15 the right historical choice for every car, since exact originality can vary by market, delivery, and restoration objective. Owners chasing a highly exact presentation should compare tire appearance against marque references, photographs, and other vehicle-specific historical guidance before finalizing a sidewall style.

Tire construction changes more than ride behavior on a restored 1955 Porsche 356 A. A 560-15 bias-ply tire preserves the older sizing language and a more traditional visual profile, while a 155R15 radial introduces a later-style metric designation even though it still uses a 15-inch rim.

That difference can be important on a small early Porsche where tire shape and sidewall presentation are easy to notice. Anyone balancing road use with restoration appearance may want to compare a standard radial option with a bias-look radial alternative, then judge the final choice against the car’s overall finish and stance.

Yes, modifications can affect tire fitment on a 1955 Porsche 356 A even when the tire size itself is correct. Changes to wheel width, wheel offset, suspension height, brake components, or body clearances can all alter how a 560-15 or 155R15 tire sits and moves through its full steering range.

A car that has been lowered, fitted with non-stock wheels, or rebuilt with later components deserves a closer inspection before tire selection. Checking inner clearance, outer fender room, and steering sweep is especially important on compact vintage cars where a small difference in wheel or suspension setup can matter.

Before driving a 1955 Porsche 356 A on new tires, inspect the wheels for correct diameter and condition, confirm lug hardware and mounting surfaces, and make sure the tires are inflated properly for the setup being used. The suspension, steering, and alignment should also be in sound condition.

A short initial road test is a smart follow-up after installation. Pay attention to rubbing, unusual pull, vibration, and any sign that the tire is contacting the body or suspension, since an old-car tire change can uncover wheel, brake, or alignment issues that were not obvious when the previous tires were removed.

Collector-car tires on a 1955 Porsche 356 A should be maintained with regular pressure checks, routine visual inspections, and attention to aging as well as tread wear. Sidewall cracking, bulges, cuts, flat spotting, and unexplained air loss all deserve prompt attention, especially on a car that spends long periods parked.

Storage conditions matter almost as much as mileage on a lightly used Porsche. Keeping the car away from prolonged sunlight, heat, and ozone sources helps preserve the tires, and periodic inspection before each drive is wise because a vintage vehicle may cover very few miles while still carrying tires that have aged significantly.