1955 Austin A 40 Tires

The 1955 Austin A 40 uses two primary tire sizes: 560-15 in bias-ply construction and 155R15 in radial construction. Both sizes are associated with a 15-inch rim, so the main difference is not wheel diameter but the tire format and construction style chosen for the car.

That means the first step is confirming which setup is actually on the vehicle now and which direction suits its use. A restoration-oriented car may stay with 560-15 for a more traditional look, while a driver-oriented setup may favor 155R15. Wheel width, tire clearance, and the condition of the existing wheels should be checked before changing from one construction type to the other.

Both tire sizes used on the 1955 Austin A 40 are built around a 15-inch rim diameter. That applies to the 560-15 bias-ply size and the 155R15 radial size, so the car's fitment question centers on construction choice more than rim diameter alone.

Rim diameter is only part of the picture, though. A 15-inch wheel still needs to be checked for width and condition, especially if the car has been changed over the years. Radial products in 155R15 often show rim-width ranges beginning around 4.00 inches, while 560-15 bias-ply options vary by product, so the actual wheel on the car deserves a careful look before selection.

The 1955 Austin A 40 Cambridge can be fitted with the same two sizes associated with the core model: 560-15 in bias-ply construction and 155R15 in radial construction. In other words, Cambridge fitment does not introduce a separate rim diameter or a unique size outside those two choices.

That keeps sub-model fitment relatively simple, but the real decision still depends on the car's current wheel and tire setup. A Cambridge kept in a period-style configuration may point toward 560-15, while a car already using radial construction may be better matched to 155R15. Looking at the wheel width and the tire clearance around the arches is the practical next step.

On the 1955 Austin A 40, 560-15 is the bias-ply tire size. It uses the older numeric sizing system and is the traditional fitment format for this application, with available choices in blackwall, narrow whitewall, and wide whitewall styles.

That matters because a 560-15 bias-ply tire and a 155R15 radial do not behave like the same product just because both use 15-inch rims. Owners choosing 560-15 are usually prioritizing traditional construction and appearance. Before making any change away from it, compare the wheel width, overall setup, and the car's intended use rather than assuming any radial alternative is automatically suitable.

Two radial-equivalent sizes are available for 560-15: 155R15 and 560R15. The 155R15 option is an 80-series metric radial equivalent, while 560R15 is a bias-look radial equivalent intended to keep a more traditional visual character than a modern-looking radial size.

Those options give different paths depending on what matters most on the car. The recommended rim-width range tied to these equivalents is 4-5 inches, so wheel width should be confirmed before conversion. Overall dimensions, fender clearance, and steering clearance also deserve attention, especially if the Austin has seen wheel, suspension, or body changes during its life.

That choice depends on what the 1955 Austin A 40 is being asked to do. A 560-15 bias-ply tire keeps the car in a traditional format and opens the door to period-style sidewall treatments, while a 155R15 radial keeps the same 15-inch rim diameter but follows a more modern construction approach.

Appearance, driving expectations, and wheel compatibility should guide the decision. A restoration-focused car often leans toward bias-ply for visual authenticity, while a regularly driven car may lead an owner to consider radial construction. The key checks are the actual wheel width, available clearance, and whether the current suspension and steering condition are appropriate for the construction you plan to run.

Start with the basics: confirm that 560-15 is the size and construction direction intended for the car, then compare the available sidewall styles and tire series. In this size, choices include blackwall, narrow whitewall, and wide whitewall options, plus brand differences across Firestone, US Royal, Coker Classic, and Pro-Trac.

After size confirmation, think about how the Austin will be used and presented. A restoration-minded car may lean toward a whitewall treatment, while a simpler driver or more understated look may favor blackwall. Rim-width specifications also vary by product, so the actual wheel should be measured rather than assumed. Load figures and general tire condition matter too if the car will see regular road use.

Sidewall style depends on which tire size and construction you choose. In 560-15 bias-ply, the 1955 Austin A 40 has blackwall, narrow whitewall, and wide whitewall choices. In 155R15 radial, the available products are blackwall tires, which creates a more restrained and modern-looking presentation.

That makes sidewall style one of the clearest visual decisions on this car. Whitewalls can support a distinctly mid-1950s look, while blackwalls keep things simpler and may better suit a radial conversion. Appearance alone should not decide the purchase, though. The sidewall treatment still needs to be paired with the right size, the intended construction, and a wheel that falls within the tire's rim-width requirements.

The 1955 Austin A 40 has tire options from Firestone, Michelin, Avon, Vredestein, US Royal, Coker Classic, and Pro-Trac. The brand mix changes with the tire size, with 155R15 radial choices coming from Firestone, Michelin, Avon, and Vredestein, while 560-15 bias-ply options include Firestone, US Royal, Coker Classic, and Pro-Trac.

Brand should be considered alongside the tire's construction, series, sidewall style, and intended use. Some buyers will narrow the field by looking for a blackwall radial, while others will be focused on whitewall bias-ply presentation. A useful comparison is not just the name on the sidewall, but also the rim-width range, load information where shown, and how closely the tire suits the car's overall direction.

A period-style 1955 Austin A 40 will usually point toward the 560-15 bias-ply size, because it preserves the older numeric sizing format and opens up traditional sidewall choices. Blackwall, narrow whitewall, and wide whitewall versions are available, giving the owner room to match the car's visual presentation without leaving the bias-ply category.

That does not automatically make one sidewall treatment historically correct for every car, since exact originality can depend on market, trim, and surviving documentation. When authenticity matters at a high level, marque references and period photographs are worth consulting. For many restorations, though, staying with the 560-15 bias-ply format is the clearest starting point for a traditional Austin A 40 appearance.

Tire construction changes the visual tone of a restored 1955 Austin A 40 almost as much as the wheel itself. A 560-15 bias-ply tire gives the car a more traditional small-sedan presentation, especially when paired with whitewall options, while a 155R15 radial creates a more modern visual impression even though it still uses the same 15-inch rim diameter.

That difference matters when the goal is to make the finished car feel consistent with its era. Buyers focused on authenticity usually pay close attention to size format, sidewall style, and overall stance before choosing a brand. Owners more interested in driving character may accept the visual shift that comes with radial construction, but it is still worth checking that the tire's proportions complement the car.

Yes, modifications can affect tire fitment on a 1955 Austin A 40 even when the tire size itself is correct. Changes to wheel width, wheel offset, ride height, springs, steering components, or bodywork can all alter how a 560-15 bias-ply or 155R15 radial sits within the car's available space.

That is why an Austin with aftermarket wheels or suspension changes should be inspected rather than matched by size alone. Look closely at steering clearance, inner-fender space, and the position of the tire at full lock and under suspension movement. Cars that have been stored, restored, or modified over time often differ from stock assumptions, so a hands-on check is worth the effort before final tire selection.

Before driving a 1955 Austin A 40 on new tires, inspect the wheels for correct diameter, width, and general condition, then verify that the tires are seated properly and inflated to the product's requirements. It is also smart to check for rubbing at the fenders and steering components before heading onto the road.

A broader pre-drive inspection is especially important on an older collector car. Look at suspension wear, steering play, brake condition, and any signs that the car sits unevenly. After a short initial drive, recheck tire pressure and inspect for scuffing or contact marks. That first follow-up can catch clearance or setup issues early, before they become expensive or potentially unsafe.

Collector-car tires on a 1955 Austin A 40 should be maintained with regular pressure checks, visual inspections, and careful storage habits. Whether the car wears 560-15 bias-ply tires or 155R15 radials, watch for sidewall cracking, tread damage, bulges, uneven wear, and gradual air loss, especially if the car spends long periods parked.

Storage conditions matter more than many owners realize. Keeping the car away from prolonged sunlight, excess heat, moisture, and ozone sources helps preserve the tires between drives. It also helps to move the car periodically and inspect the contact patch area after storage. A tire that still has tread can still be unsuitable for road use if age and condition have caught up with it.