Austin A 105 Tires

Austin A 105 models from 1957 through 1962 are associated with two tire sizes: 185R15 and 640-15. Both sizes use a 15-inch rim diameter, but they are not the same type of tire. The 185R15 is a radial format, while 640-15 is a traditional numeric bias-ply size. That means the choice is less about year changes and more about whether the car is fitted and intended for radial or crossply-style tires.

Owners should treat those two sizes as different fitment approaches rather than interchangeable labels. A car restored to period appearance may stay with 640-15 bias-ply tires, while a driver-oriented Austin A 105 may be fitted with 185R15 radials if the wheel and overall setup support that choice. Check the wheel width, inspect what is currently on the car, and compare the tire type with restoration goals before settling on a replacement.

On an Austin A 105, 640-15 is an older numeric bias-ply tire size. The 640 is the nominal section width in the traditional American and British numeric system, with the decimal omitted, and the 15 is the rim diameter in inches. It is a bias-ply size rather than a modern metric radial code, and the available products in this size are all bias-ply tires for 15-inch wheels.

That matters because a 640-15 Austin A 105 tire has a different construction feel and a different visual character from a radial, even though both listed sizes share the same rim diameter. If your car has older-style wheels, period-style stance, or a restoration brief that favors crossply appearance, 640-15 is the size to examine first. Tube use should be part of the plan when fitting this type of bias-ply tire.

Austin A 105 uses a 15-inch rim diameter in both listed tire sizes. The radial 185R15 products are built for 15-inch wheels, and the numeric bias-ply 640-15 products are also built for 15-inch wheels. There is no wheel diameter change across the 1957 to 1962 span within these listed fitments, even though the tire construction type differs.

The practical question is not whether the wheel is 15 inch, but which 15-inch tire family your car is actually set up to use. Wheel width ranges differ between the available radial and bias-ply products, so confirm the wheel itself before replacing a mixed or unknown set. Measuring the rim and comparing it with the product specification is the safest way to avoid choosing the right diameter but the wrong style of tire.

Austin A 105 applications using the 640-15 bias-ply size should be treated as requiring tubes. That size is offered here only in bias-ply construction, and tube use is part of traditional fitment practice for this style of tire. The 185R15 radial options are a different case, with several products marked as tubeless radial designs rather than tube-type bias-ply construction.

If your Austin A 105 is staying with 640-15 tires for originality, plan the tire, tube, and rim condition together instead of treating them as separate issues. If the car is on 185R15 radials, check the specific wheel condition and valve setup before assuming a direct changeover. Old collector wheels can have corrosion, wear, or profile differences that deserve inspection while the tires are off.

Austin A 105 is listed with both 640-15 bias-ply tires and 185R15 radial tires, so either path can make sense depending on the car's purpose. Bias-ply tires preserve the period look and driving character most owners associate with late-1950s fitment, while radial tires represent a later construction style that many owners choose for road use. Both fit 15-inch rims, but they should be viewed as different tire systems rather than simple substitutes.

The best choice comes down to how your Austin A 105 is used. A show-focused or authenticity-minded restoration usually leans toward 640-15 bias-ply, especially with era-correct sidewall styling. A car driven more frequently may benefit from staying with 185R15 radial construction if the wheel width and overall setup are appropriate. Decide first whether originality or modernized road manners is the priority, then match the tire to that goal.

Yes, radial tires can change how an Austin A 105 feels on the road compared with traditional crossply tires. The 185R15 options use radial construction, while the 640-15 options use bias-ply construction, and those two designs behave differently in ride, steering feel, and straight-line stability. The change is substantial enough that owners usually notice it even when the wheel diameter remains the same at 15 inches.

That does not automatically make one choice better for every Austin A 105. A radial-equipped car may feel more familiar to a modern driver, but a bias-ply-equipped car often preserves the steering response and stance expected in a period restoration. If the car has been in the family for years, compare the current tires with the way the suspension, alignment, and wheels are set up before making a wholesale switch in construction.

Mixing crossply and radial tires on an Austin A 105 is not a good practice. The listed sizes represent two different construction types, with 640-15 in bias-ply and 185R15 in radial, and those designs react differently under braking, cornering, and load. Even though both use 15-inch rims, their carcass behavior is not the same, so a mixed set can create inconsistent handling.

A collector car is happiest when all four tires match in size family and construction. If your Austin A 105 currently has an uneven mix from years of partial replacements, choose a complete direction and bring the car back to one consistent specification. That also makes alignment checks, pressure setting, and road testing more meaningful, because you are evaluating one tire behavior instead of two conflicting ones.

A 1957 Austin A 105 can be associated with either 185R15 radial or 640-15 bias-ply tires, and the same is true through 1962. Since both sizes are listed for the year and both fit 15-inch rims, the deciding factors are the wheels on the car, the construction type you intend to run, and whether the car is being kept period-correct or used with a radial conversion approach.

Start by reading the sidewall of the tires already fitted, then measure wheel width and compare it with the acceptable ranges for the replacement tires under consideration. A radial product may suit a wider rim range than a bias-ply product, and that alone can settle the choice. If the Austin A 105 has changed hands or been restored in stages, inspect rather than assume, because older cars are often no longer wearing their originally chosen tire type.

Austin A 105 tire options include blackwall, narrow whitewall, wide whitewall, and redline sidewall styles. The 185R15 radial offerings appear in blackwall, narrow whitewall, and redline forms, while the 640-15 bias-ply offerings include blackwall, narrow whitewall, and wide whitewall versions. That gives owners a wide visual range, from restrained touring appearance to more prominent period-style sidewall treatment.

For a restoration-minded Austin A 105, sidewall choice should support the car's era and presentation rather than follow modern fashion. Wide or narrow whitewalls usually suit a late-1950s and early-1960s period look, while blackwalls often work well on more understated builds. Redlines are available in the radial size, but they create a more specialized appearance, so they are best chosen when they clearly match the car's intended style.

Austin A 105 tire options are available from Coker Classic, Michelin, Avon, Universal Vintage Tire, BFGoodrich, Firestone, and Excelsior. Those brands span both of the listed size families, with radial choices concentrated in 185R15 and bias-ply choices concentrated in 640-15. The brand mix also reflects different visual and construction approaches rather than one single replacement standard.

Brand choice for an Austin A 105 should come after size family and construction have already been settled. Once you know whether the car needs 640-15 bias-ply or 185R15 radial, compare sidewall style, rim-width compatibility, and the period character you want the car to present. A well-chosen tire for a collector car is usually the one that fits the wheel, suits the way the car is used, and looks right for the restoration strategy.

Austin A 105 tire options include several distinct series: Coker Classic Radial, Michelin XVS, Turbosteel CR3B, Universal Sport, Silvertown Classic Bias Ply, Firestone Classic Bias Ply, Super Safety Crossply, and Excelsior Bias Ply. The broad split is between radial series in 185R15 and bias-ply or crossply series in 640-15. Within those groups, the differences are mainly construction family, sidewall styling, and the overall driving and appearance character they bring to the car.

That variety lets an Austin A 105 owner choose more precisely than simply picking a size. A Michelin XVS or other 185R15 radial points the car toward later-feeling road manners, while Silvertown, Firestone, Avon Super Safety, or Excelsior bias-ply choices preserve a more traditional presentation. Once the car's mission is clear, compare each series on rim-width compatibility and sidewall appearance so the tire supports both fitment and finish.

An Austin A 105 should be stored on clean, properly inflated tires in a cool, dry, dark space away from direct sunlight, ozone sources, and chemical contamination. Long periods on one spot can flat-spot collector tires, especially older-style bias-ply constructions such as 640-15. Keeping the car on a clean sealed floor, moving it periodically, and shielding the tires from ultraviolet exposure all help preserve the casing and sidewall.

If the Austin A 105 is stored for a season at a time, check pressures before and after storage and avoid leaving the full vehicle weight motionless for many months if you can relieve it safely. Cars on bias-ply tires often benefit from more frequent movement than cars on radials. Good storage practice protects not only the tread, but also the visual quality of whitewalls, blackwalls, and decorative sidewall details.

Tires on an Austin A 105 should be visually inspected before every meaningful drive and given a more thorough condition check at regular intervals throughout the year. Look for sidewall cracking, uneven wear, impact damage, bead deterioration, age-related hardening, and pressure loss. Collector cars often accumulate little mileage, so time, storage conditions, and inactivity can matter more than tread depth alone.

A practical routine is to inspect the Austin A 105 before road use, then schedule a deeper look at least seasonally if the car is driven only occasionally. Bias-ply tires deserve especially careful attention because they can look acceptable at a glance while hiding age-related weakness. If the car has tubes, include the valve area and any signs of slow leakage in your checks, and inspect the wheels themselves while you are at it.

Tires on an Austin A 105 should be replaced when they show cracking, casing distortion, recurring air loss, impact damage, or any age-related deterioration that makes the structure questionable, even if the tread still looks usable. Collector tires often age out before they wear out, especially on cars driven sparingly. Apparent tread depth is only one part of tire condition, and it can be the least important part on a low-mileage classic.

Replacement timing should be guided by condition, age, and intended use rather than by mileage alone. A parade-only Austin A 105 and a regularly driven one do not face the same demands, but both need honest inspection from someone familiar with older collector tires. If an older tire has uncertain history, long storage exposure, or visible sidewall fatigue, replacement is usually wiser than trying to extract a little more service from it.

Austin A 105 is associated here with both 640-15 bias-ply tires and 185R15 radial tires, which means more than one period-appropriate tire approach exists for the model. Available series include classic bias-ply lines such as Silvertown Classic Bias Ply and Firestone Classic Bias Ply, along with radial series such as Michelin XVS and Coker Classic Radial. That mix points to a model that can be restored either with traditional crossply character or with a radial fitment consistent with later-period use.

For a specific Austin A 105 restoration, original sales literature, build records, and marque-club knowledge remain the best guides to what belonged on an individual car when new. If your priority is concours authenticity, settle the construction type before worrying about sidewall details. If the car is a sympathetic driver restoration, period-appropriate radial options may still be suitable depending on the standard you are trying to meet.

Correct tire fitment can absolutely affect how an Austin A 105 is judged and how seriously the restoration is taken. Size, construction type, sidewall style, and overall stance all contribute to whether the car presents as coherent for its era. A late-1950s British saloon wearing the wrong sidewall treatment or an obviously mismatched construction can lose authenticity even if the tire technically fits the rim.

For value and judging purposes, the Austin A 105 should wear tires that suit the standard of restoration being claimed. A preservation car, a concours restoration, and a road-oriented classic may each justify different choices between 640-15 bias-ply and 185R15 radial. Marque clubs, judging manuals, and period photography are useful references when deciding how strict the final tire presentation needs to be.

Austin A 105 tire choices include blackwall, narrow whitewall, wide whitewall, and redline styles, but not all of those will suit every restoration goal equally. Whitewall and blackwall treatments are the most natural visual directions for a late-1950s and early-1960s saloon, while redlines create a more specialized appearance. The correct choice depends on the car's market presentation, trim level character, and whether the restoration aims for understated factory style or a period custom flavor.

A conservative Austin A 105 restoration usually starts with blackwall or a modest whitewall, then works outward from period photos and marque references. Wide whitewalls can be very effective on cars presented in a more formal period manner, but they should match the rest of the car's finish and stance. Redlines are best reserved for owners who intentionally want a less factory-stock look within a period-inspired presentation.

A properly fitted, properly maintained tire of the correct size and construction can be suitable for driving an Austin A 105 on public roads, but safety depends on the whole condition of the car rather than the tire alone. The model is associated with both 185R15 radial and 640-15 bias-ply tires, and each must be matched correctly to the wheel and used in sound mechanical condition. Steering, brakes, suspension, wheel integrity, and inflation are all part of the safety equation.

Before road use, treat the Austin A 105 as a complete mechanical system rather than assuming new tires solve every risk. A fresh set of properly selected tires can improve confidence, but old suspension parts, poor alignment, or damaged rims can still undermine how the car behaves. Any newly acquired collector car should be inspected thoroughly before regular driving, especially if its previous tire history is unclear.

Before driving an Austin A 105, check tire pressure, visible sidewall condition, tread condition, valve stems, and any signs of wheel damage or air loss. Confirm that all four tires match in size family and construction, especially because Austin A 105 can appear with either 640-15 bias-ply or 185R15 radial tires. Also make sure nothing is rubbing at full steering lock and that the car sits evenly on all four corners.

A short pre-drive routine goes a long way on a collector car. If the Austin A 105 has been parked for weeks or months, let the tires reveal whether they are holding pressure and recovering from storage without cracking or severe flat-spotting. It is also wise to keep an eye on wheel balance, brake pull, and steering response during the first miles, since those early impressions often reveal tire or chassis issues before they become more serious.

Appropriate speed for an Austin A 105 depends on the exact tire fitted, the condition of the tire, and the overall state of the car. A sound Austin A 105 on modern-manufactured radial or bias-ply collector tires can generally be used in a normal classic-car manner, but the car should still be driven with respect for its age, suspension design, and braking ability. Tire speed should never be judged by appearance alone on an older vehicle.

The right approach is to let the Austin A 105 settle into stable, comfortable cruising rather than pushing it as if it were a modern sedan. If the car is on 640-15 bias-ply tires, a more conservative pace usually suits both the construction and the period driving character. Whatever the tire type, build speed gradually after any tire change and pay attention to vibration, wander, or heat, all of which can signal that further inspection is needed.