The 1956 Porsche 356 A sits at a pivotal point in Porsche history, carrying the light, compact character that made the early 356 such an enduring driver’s car. Tire choice matters on a car like this because the steering feel, stance, and overall presentation are closely tied to the right size and construction. The 1956 Porsche 356 A uses either a 560-15 bias-ply or a 155R15 radial on a 15-inch rim. That opens the door to traditional bias-ply styling, blackwall radial options from several classic tire lines, and a bias-look radial equivalent for buyers balancing appearance with road use. The key is deciding whether originality of feel, touring manners, or restoration presentation matters most for your car.
Which Tire Size Is Right for The 1956 Porsche 356 A
The 1956 Porsche 356 A uses two primary tire sizes, both on 15-inch rims: 560-15 in bias-ply construction and 155R15 in radial construction. Because the Base model is associated with both sizes, the real decision is less about sub-model differences and more about whether you want a traditional bias-ply setup or a radial tire that keeps the car in a period-friendly size range.
155R15 uses a metric section-width measurement, with 155 representing the nominal width in millimeters, R identifying radial construction, and 15 indicating a 15-inch rim. On a 1956 Porsche 356 A, this size gives you a radial-format option that suits buyers focused on road use while staying in a classic small-car sizing convention. Available choices center on blackwall designs from Firestone, Michelin, Avon, and Vredestein, with series such as F560 Radial, Michelin X, XAS, XAS-FF, CR6ZZ, Snow Classic, and Sprint Classic. This size is worth considering when you want a historically compatible look in a radial format and are prepared to confirm wheel width and overall vehicle setup.
560-15 is a vintage numeric bias-ply size in which 560 represents an approximate 5.60-inch nominal section width and 15 identifies the rim diameter. For the 1956 Porsche 356 A, this is the traditional bias-ply fitment path and the right place to start if the goal is an earlier driving character or a more restoration-oriented tire presentation. Product choice is broad within the size, including blackwall, narrow whitewall, and wide whitewall options from Firestone, US Royal, and Coker Classic, plus a Pro-Trac Street Pro Front Runner variation. This size deserves a close look when period-style appearance matters and you want to compare sidewall treatment as carefully as construction.
Sub-model fitment is straightforward here because the covered 1956 Porsche 356 A Base is associated with both primary tire sizes. What matters most is confirming whether the car is staying with its traditional bias-ply setup or moving to a radial-size configuration on the same 15-inch wheel diameter.
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1956 Porsche 356 A Base
The 1956 Porsche 356 A Base is associated with both 560-15 bias-ply and 155R15 radial fitments on 15-inch rims. That gives the owner two distinct directions: preserve a more traditional bias-ply presentation or evaluate a radial option that stays within the car’s classic small-diameter wheel format.
Bias-Ply to Radial Tire Conversion for the 1956 Porsche 356 A
For the 560-15 primary tire size, two radial-equivalent choices are available. 155R15 is the equivalent 80-series metric radial, while 560R15 is the bias-look radial equivalent. The 155R15 option keeps the sizing in a Euro-metric radial format, and 560R15 is the closer visual bridge for buyers who want a more traditional tire presentation. A recommended rim-width range of 4 to 5 inches applies to these alternatives, and wheel width, overall fit, and clearance should still be checked before changing construction.
Modern Radial Equivalents
155R15
Equivalent 80-series Metric Radial (560-15)
560R15
Bias-look Radial Equivalent (560-15)
Important Considerations When Replacing Bias Ply With Radial
Compare overall diameter and section width carefully to ensure proper fit.
Verify recommended rim range (4-5 in) and load needs match your vehicle specifications.
Check fender clearance, steering clearance, and stance before installation.
Consider suspension condition and intended road use when choosing equivalents.
Important Fitment Notes
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 1956 Porsche 356 A Tires for Sale
Available 1956 Porsche 356 A tire choices span 155R15 radial and 560-15 bias-ply fitments, with brands including Firestone, Michelin, Avon, Vredestein, US Royal, and Coker Classic. The main comparison points are construction, tire series, and sidewall treatment, especially blackwall, narrow whitewall, and wide whitewall offerings in 560-15.
These FAQs focus on the two tire sizes used on the 1956 Porsche 356 A, the difference between bias-ply and radial choices, radial equivalents for 560-15, and the fitment checks that matter before the car goes back on the road.
Tire Size & Fitment
What tire size fits a 1956 Porsche 356 A?
The 1956 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 main distinction is not wheel diameter but tire type, appearance, and the overall driving setup you want for the car.
Choosing between them starts with the car itself. A 356 A kept close to an earlier-style presentation may stay with 560-15, while a car set up for road use may be evaluated in 155R15 radial form. Wheel width, suspension condition, and any prior modifications should be checked before making the final call.
What size rim does a 1956 Porsche 356 A use?
Both primary tire sizes used on the 1956 Porsche 356 A are built for a 15-inch rim. That includes the 560-15 bias-ply size and the 155R15 radial size, so the vehicle stays within one rim diameter even though it has two different tire-format choices.
Rim diameter is only the first step, though. Wheel width still matters, especially if the car has replacement wheels or older rims of uncertain origin. Before selecting a tire, verify the actual wheel dimensions on the car and make sure the tire choice matches the wheel as well as the available fender and suspension clearance.
What does 560-15 mean on a 1956 Porsche 356 A?
560-15 is a vintage numeric bias-ply size. The 560 portion represents an approximate 5.60-inch nominal section width, and the 15 identifies the rim diameter in inches. On a 1956 Porsche 356 A, that size points to a traditional bias-ply tire rather than a modern metric radial format.
That matters because the size influences both the look of the car and the type of tire choices available within it. Buyers comparing 560-15 tires will often weigh blackwall versus whitewall appearance, bias-ply construction, and wheel compatibility, while also deciding whether to stay with this original-style format or consider a radial equivalent.
Bias-Ply & Radial Options
Is 560-15 a bias-ply or radial tire for the 1956 Porsche 356 A?
On the 1956 Porsche 356 A, 560-15 is a bias-ply tire size. It belongs to the older numeric sizing system and is available in several bias-ply forms, including blackwall, narrow whitewall, and wide whitewall versions depending on the tire line and brand.
That construction choice affects more than size notation. Buyers who want to keep the car in a traditional bias-ply presentation may start here, while anyone considering a change in construction should also review radial equivalents, wheel width, and clearances. Keeping the same rim diameter does not remove the need to verify the full wheel-and-tire combination.
What radial tire sizes are equivalent to 560-15?
Two radial equivalents are associated with 560-15. The first is 155R15, which is an 80-series metric radial, and the second is 560R15, which is a bias-look radial equivalent. Those two options give the 1956 Porsche 356 A owner both a conventional classic radial format and a radial that keeps a more traditional visual character.
The recommended rim-width range for these equivalents is 4 to 5 inches. Even with an accepted equivalent, selection should still account for the actual wheel on the car, overall fit within the fender opening, and any suspension or steering changes that could alter clearance compared with a stock-style setup.
Should I use bias-ply or radial tires on a 1956 Porsche 356 A?
The answer depends on what matters most for the car. A 560-15 bias-ply setup keeps the 1956 Porsche 356 A in its traditional tire format, while 155R15 offers a radial-format choice in the same 15-inch rim diameter. Both are legitimate directions within this vehicle’s tire fitment range.
A restoration-oriented owner may focus on period-style appearance and a bias-ply presentation, while a road-use owner may prefer to evaluate radial options. The important step is to match the tire to the car’s actual wheels, condition, and intended use rather than assuming that every 356 A will want the same construction.
Choosing the Right Tire
What should I consider when choosing a 560-15 tire for a 1956 Porsche 356 A?
Start with the role the tire needs to play on the car. In 560-15, the 1956 Porsche 356 A has bias-ply choices from Firestone, US Royal, Coker Classic, and Pro-Trac, with differences in sidewall treatment, tire series, rim-width specifications, and in some cases load details such as 970@32 psi.
That means selection is not just about finding the correct size code. A blackwall, narrow whitewall, or wide whitewall changes the car’s presentation, and rim-width compatibility matters if the wheels are not original-style. The best comparison is one that balances period-style appearance, wheel match, and how the car will actually be driven.
What sidewall styles are available for 1956 Porsche 356 A tires?
The available sidewall styles for the 1956 Porsche 356 A depend on tire size. In 155R15 radial form, the available products are blackwall tires. In 560-15 bias-ply form, the choices broaden to blackwall, narrow whitewall, and wide whitewall, giving the owner more freedom to shape the car’s visual presentation.
That difference matters when appearance is part of the decision. A buyer choosing 560-15 can compare how subtle or prominent the whitewall treatment should be, while a 155R15 buyer is selecting among blackwall radial lines. Sidewall style should be matched to the look you want rather than treated as proof of exact factory originality.
What brands offer tires for the 1956 Porsche 356 A?
The 1956 Porsche 356 A has tire choices from Firestone, Michelin, Avon, Vredestein, US Royal, Coker Classic, and Pro-Trac across its two primary sizes. Brand selection varies by size, with 155R15 centered on radial offerings and 560-15 centered on bias-ply products and a wider range of traditional sidewall treatments.
Brand alone should not decide the tire. It is more useful to compare each option by construction, tire series, sidewall style, wheel compatibility, and the role the car plays in your garage. A lightly driven restoration, a weekend touring car, and a visually oriented display car may all point toward different choices within the same fitment range.
Restoration & Appearance
Which tire should I choose for a period-style 1956 Porsche 356 A?
A period-style 1956 Porsche 356 A often starts with the 560-15 bias-ply size because it preserves the earlier numeric fitment format and opens the door to traditional blackwall, narrow whitewall, or wide whitewall presentation. That makes it the natural place to begin when the car’s visual character matters as much as simple tire replacement.
Construction and sidewall treatment should be chosen with the finished look of the car in mind. If exact historical accuracy is important, marque-specific references and restoration documentation are still worth checking, since a period-style tire and an exact as-delivered tire appearance are not always the same thing.
How does tire construction affect the appearance of a restored 1956 Porsche 356 A?
Tire construction changes the visual impression of a restored 1956 Porsche 356 A more than many buyers expect. A 560-15 bias-ply keeps the car in a traditional vintage format, while a 155R15 radial introduces a more modern sizing convention even when the wheel diameter remains the same at 15 inches.
That difference becomes especially noticeable when comparing sidewall choices. The radial offerings here are blackwall, while the bias-ply selections include blackwall, narrow whitewall, and wide whitewall styles. For a restoration-minded owner, the tire is part of the car’s stance and era-correct mood, not just a functional wear item.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1956 Porsche 356 A?
Yes, modifications can affect tire fitment on a 1956 Porsche 356 A even when the size itself is correct. Changes such as aftermarket wheels, altered wheel width, suspension work, ride-height changes, or body adjustments can all influence how a 560-15 or 155R15 tire sits and clears the car.
A modified car should be measured rather than assumed. Check actual wheel dimensions, steering travel, fender clearance, and suspension movement before finalizing a tire choice. That is especially important when changing construction type, since staying with a 15-inch rim does not guarantee the same behavior or space requirements around the tire.
What should I inspect before driving a 1956 Porsche 356 A on new tires?
Before driving a 1956 Porsche 356 A on new tires, inspect the wheels for condition and correct size, confirm the tires are seated properly, and check pressure, valve stems, and basic clearance at the fenders and suspension. It also helps to look over steering components, alignment condition, and brake hardware on a car that may have seen limited recent use.
A short initial drive is a smart final check. Listen for rubbing, feel for pull or vibration, and recheck pressure after the first few trips. On a collector car, the tire itself may be new while surrounding parts are still aged, so road readiness depends on the full wheel-and-suspension system, not the tire alone.
How should 560-15 or 155R15 tires on a collector 1956 Porsche 356 A be maintained?
Collector-car tire maintenance starts with regular inspection, even if the 1956 Porsche 356 A is driven only occasionally. Look for cracking, cuts, bulges, unusual wear, and gradual air loss, and keep the tires properly inflated for storage and use. Cleaning and storage conditions also matter because long periods of inactivity can age tires unevenly.
The best habit is to inspect the tires before every meaningful drive rather than relying on mileage alone. A 356 A that sits for long stretches should also be protected from prolonged sunlight, moisture, and ozone sources. Tire age, wheel condition, and visible wear all deserve attention before the car returns to regular road use.
