1965 Austin A 40 Tires

The 1965 Austin A 40 uses two primary tire sizes: 145R13 in radial construction and 520-13 in bias-ply construction. Both sizes are associated with 13-inch wheels, so the main difference is not rim diameter but the tire sizing system and construction style chosen for the car.

That means the first step is to confirm what is already on the car and what type of driving or restoration result you want. A radial setup and a bias-ply setup can give the Austin a different look and feel, so checking the actual wheel width, the tire currently fitted, and any past modifications will help keep the replacement choice aligned with the vehicle.

The tire fitments associated with the 1965 Austin A 40 use a 13-inch rim diameter. That applies to both the 145R13 radial size and the 520-13 bias-ply size, so the wheel diameter remains consistent even though the tire sizing systems are different.

Rim diameter is only part of the fitment picture, especially when switching between a vintage bias-ply and a radial. It is still worth checking the actual wheel width on the car, because some tires carry specific rim-width guidance, and an older Austin may have been changed from its earlier setup during restoration or regular use over the years.

The 1965 Austin A 40 (opt. rim) follows the same overall fitment pattern, using either 145R13 radial or 520-13 bias-ply tires. In practical terms, that sub-model does not introduce a different wheel diameter, but it does preserve the same split between a modern-style radial size and a traditional numeric bias-ply size.

That makes tire selection more about the specific wheel and construction already on the vehicle than about trimming down a long list of sub-model-only sizes. Looking at the tire sidewall on the car, measuring the wheel if needed, and deciding whether appearance or radial conversion matters more will usually answer the fitment question quickly.

520-13 is a bias-ply tire size for the 1965 Austin A 40. It uses the older numeric sizing format common to many vintage applications, with 5.20 indicating nominal section width and 13 indicating wheel diameter, and it is offered in traditional bias-ply construction rather than as a primary radial size.

Choosing 520-13 usually means keeping a more period-style tire format on the car, which can matter for restoration appearance and traditional driving character. Owners considering a switch away from that construction should compare wheel width, overall tire dimensions, and available radial-equivalent sizes carefully rather than assuming any radial alternative will behave the same on the Austin.

Radial equivalents for 520-13 include 155R13 as an 80-series metric radial, P155/75R13 as a P-metric 75-series radial, and P155/70R13 as a P-metric 70-series radial. A bias-look radial equivalent is not part of the available equivalent set for this size.

Those options give the 1965 Austin A 40 owner several ways to compare a radial alternative to the original bias-ply size, but they are not interchangeable by name alone. The recommended rim-width range tied to these equivalents is 4 to 5 inches, so wheel width, tire dimensions, and clearance at the fender and steering points should be confirmed before converting.

A bias-ply-to-radial conversion on a 1965 Austin A 40 starts with confirming the actual wheel diameter and width, then comparing the radial equivalent under consideration with the car's existing tire dimensions. For the 520-13 size, the radial-equivalent path includes 155R13, P155/75R13, and P155/70R13, with a recommended rim-width range of 4 to 5 inches.

Beyond the size label, the important checks are steering clearance, fender clearance, suspension condition, and how the car is meant to be used. An Austin that has aftermarket wheels, altered ride height, or worn suspension parts may respond differently to a construction change, so the conversion should be evaluated as a full fitment decision rather than just a tire purchase.

Start with the role the tire needs to play on the car. A 520-13 tire for a 1965 Austin A 40 is a bias-ply fitment, so the key considerations are period-style appearance, the sidewall treatment you want, the wheel width on the car, and any product differences in load capacity or construction details.

Within that size, the available choices include blackwall, narrow whitewall, and wide whitewall presentations from Firestone and Premium Sport. Looking at rim-width specifications where they are given, along with the intended use of the car and the look you want under the fenders, will usually narrow the field more effectively than focusing on brand name alone.

The 1965 Austin A 40 has sidewall variety across its available tires. Blackwall options appear in both the 145R13 radial and 520-13 bias-ply sizes, while the 520-13 bias-ply range also includes narrow whitewall and wide whitewall styles for a more traditional or customized visual presentation.

That sidewall choice can change the personality of a small British car more than many buyers expect. Blackwall usually keeps the look understated, while whitewall treatments lean more toward restoration-oriented style or a period custom flavor, so it helps to choose the sidewall after deciding whether the car is meant to read as original-looking, personalized, or simply road-ready.

Michelin, Firestone, and Premium Sport all offer tires for the 1965 Austin A 40. Michelin and Firestone cover the 145R13 radial size in blackwall form, while Firestone and Premium Sport appear in the 520-13 bias-ply range with several appearance-focused variations.

Brand alone should not drive the decision. It makes more sense to compare the correct size first, then look at construction, tire series, sidewall style, and any rim-width or load specifications that matter for the way the Austin will be used. That approach keeps the choice tied to fitment and vehicle character instead of treating every tire in the size as the same.

For a period-style 1965 Austin A 40, the 520-13 bias-ply size is usually the starting point because it preserves the vintage numeric sizing format and traditional construction. Within that size, there are blackwall, narrow whitewall, and wide whitewall choices, which lets the owner tune the appearance without leaving the bias-ply fitment path.

The best visual choice depends on the exact restoration goal and the way the car is being presented. If historical accuracy matters at a very high level, it is smart to compare your tire choice against marque-club references, period photos, or restoration records, since a size may be appropriate while a particular sidewall treatment may reflect a different style direction.

Tire construction changes more than ride and handling on a restored 1965 Austin A 40; it also changes how the car looks at a glance. A 520-13 bias-ply tire delivers a more traditional vintage presentation, while a 145R13 radial gives the car a more modern tire profile and a different visual relationship between sidewall and tread.

That difference matters on a compact British car where the wheel and tire are always part of the overall stance. Owners trying to preserve an older showroom-era impression often stay with bias-ply construction, while those prioritizing regular road use may prefer the radial route, provided the final choice still suits the wheel dimensions and overall look of the vehicle.

Yes, modifications can affect tire fitment on a 1965 Austin A 40 even when the tire size itself is correct on paper. Aftermarket wheels, changed wheel width, altered ride height, suspension work, or body changes can all influence how a 145R13 or 520-13 tire sits in the wheel opening and clears during steering movement.

A car that has been restored or personalized over the years should be checked as it currently sits, not as it may have left the factory decades ago. Measuring wheel width, checking the existing tire clearance, and looking for rub marks around the fender and suspension area will help prevent a size that seems correct from creating practical fitment issues.

Before driving a 1965 Austin A 40 on new tires, inspect the wheels for damage, confirm the lug hardware seats properly, and make sure the tires are mounted in the correct size and construction for the setup on the car. It is also wise to verify pressure, valve condition, and basic clearance with the steering turned in both directions.

A short, careful road test is a good way to catch issues early. Listen for rubbing, watch for unusual vibration, and recheck pressure after the first drive, especially on a collector car that may sit for long periods between outings. Tire condition should remain part of regular maintenance, since older vehicles often accumulate age before they accumulate many miles.

520-13 tires on a collector 1965 Austin A 40 should be maintained with regular pressure checks, visual inspections, and careful storage habits. Bias-ply tires deserve close attention to sidewall condition, tread wear, cuts, bulges, and signs of aging, especially on a car that spends more time parked than it does covering road miles.

Storage environment matters almost as much as road use. Keeping the Austin away from prolonged sunlight, excess heat, moisture, and ozone sources can help preserve the tires between drives, and the tires should still be inspected before each outing rather than judged by tread depth alone. On a low-use vintage car, age and condition are often more important than mileage.