1948 Holden Tire Fitment Guide

1948 Holden vehicles use two tire sizes: 155R15 and 550-15. Both sizes apply to the 1948 Holden 48/215, and both mount on 15-inch wheels. The radial 155R15 is supported on 4.00- to 5.50-inch rim widths in the available range, while the 550-15 bias-ply fits narrower 3.00- to 3.50-inch rims.

That means the basic wheel diameter stays the same, but wheel width and tire construction can change the right choice. If your 1948 Holden still has narrow original-style wheels, the 550-15 bias-ply is the more natural match. If the car is already set up around wider 15-inch rims, the 155R15 radial may be the more appropriate direction to investigate before choosing a specific product.

On a 1948 Holden, 550-15 is a numeric bias-ply size. The 550 portion refers to a nominal 5.50-inch section width, and the 15 identifies the wheel diameter in inches. It is a traditional bias-ply format from the era, so the size reads differently from later metric radial markings.

That older size format matters because it points you toward a period-style tire and the narrower rim widths that go with it. If your goal is to preserve the original visual character of a 1948 Holden 48/215, 550-15 is the size family most in keeping with that period approach. It is also the size to verify first if the car retains original-type narrow 15-inch wheels.

On a 1948 Holden, 155R15 is a metric radial size. The 155 indicates a nominal section width of 155 millimeters, the R identifies radial construction, and the 15 is the wheel diameter in inches. In this style of marking, the omitted aspect ratio conventionally indicates an 80-series profile.

That makes 155R15 very different in character from a 550-15 bias-ply even though both fit 15-inch wheels. A 1948 Holden owner looking at 155R15 should also pay attention to the exact product marking, because the available choices include different speed ratings and both tube-type and tubeless variations. Reading the full sidewall code before ordering helps you choose the version that matches your wheels and intended use.

Yes. For 1948 Holden, the single production model covered here is the 48/215, and it can use both listed tire sizes: 155R15 and 550-15. There is no model-to-model size split within the 1948 Holden lineup because there is only one core model represented.

That simplifies the search compared with makes that offered multiple body lines or wheel diameters in the same year. With 1948 Holden, the real choice is not between different models but between different tire constructions and the wheel widths that support them. Once you confirm you have a 48/215, the next step is deciding whether your car is staying close to early postwar specification or being equipped around a radial setup.

For a 1948 Holden, the 550-15 bias-ply is the more era-appropriate choice if originality of look and construction is the priority, while the 155R15 radial is the alternative for owners who want a radial-format tire on the same 15-inch wheel diameter. The two sizes are not simply interchangeable versions of the same tire; they reflect different construction types and different rim-width ranges.

A show-focused 1948 Holden 48/215 usually leans toward 550-15 because bias-ply construction matches the period more naturally. A car that sees more routine road miles may push the decision toward 155R15, provided the wheel width is suitable for that size. The cleanest way to decide is to start with your wheel width and then choose the construction that best suits how the car is presented and driven.

Current 1948 Holden tire options in both 155R15 and 550-15 are available in blackwall form. The radial offerings in 155R15 are blackwall across Firestone and Michelin choices, and the 550-15 bias-ply option is also a blackwall. No alternate sidewall treatment appears within these listed sizes.

Blackwall styling suits the straightforward postwar character of the 1948 Holden very well and aligns comfortably with a utility-minded sedan from that era. If your restoration standards are especially strict, sidewall appearance should still be checked against your car’s market history and event rules, because judges often consider size, construction, and visual sidewall presentation together rather than as separate details.

Three brands cover the available 1948 Holden tire sizes. Firestone and Michelin both offer 155R15 radial choices, while Excelsior supplies the 550-15 bias-ply option. Brand choice is therefore tied closely to the size and construction path you take.

A 1948 Holden owner choosing between brands should first narrow the decision to radial or bias-ply, because the brand list changes with that choice. Within 155R15, Michelin appears in more than one series and Firestone offers its own radial interpretation, so the next comparison is the exact sidewall marking, tube status, and speed rating of the product you are considering. That approach keeps the decision practical instead of purely name-driven.

Rim width depends on which tire size you choose for a 1948 Holden. The available 155R15 radial products fit 4.00- to 5.50-inch rims, while the 550-15 bias-ply option fits 3.00- to 3.50-inch rims. Both sizes use a 15-inch wheel diameter, but they do not share the same width range.

That difference is one of the most important checks before you settle on a tire. A 1948 Holden owner moving from a narrow original-style wheel to a radial-size tire needs to verify that the wheel width is appropriate, not just that the diameter is 15 inches. Measuring the actual rim on the car is often the quickest way to avoid choosing a tire that suits the year and model but not the wheel currently fitted.

Inner tube requirements for 1948 Holden tires depend on the exact product selected. Within the 155R15 radial size, some products are marked TL for tubeless and others are marked TT for tube type, so tube use varies by product. The 550-15 bias-ply listing does not carry a TT or TL marking in the available information, so the exact tire and wheel combination should be confirmed before final installation.

The safest approach is to read the full sidewall description of the tire you intend to run and compare it with the wheel style on your 1948 Holden. A tubeless-marked radial and a tube-type radial in the same nominal size should not be treated as identical from a setup standpoint. If your car still uses older wheels, discussing the wheel construction with an experienced vintage tire installer is a sensible step.

Original 1948 Holden wheels can potentially accept either listed tire size in terms of diameter, because both 155R15 and 550-15 are built for 15-inch rims. The important limit is width, not diameter: 550-15 suits narrower 3.00- to 3.50-inch rims, while 155R15 radial products are intended for 4.00- to 5.50-inch rims.

That means a 1948 Holden owner should avoid assuming that every 15-inch wheel is equally suitable for both sizes. If the car retains narrow factory-style wheels, the bias-ply size is more likely to align with them. If the car has wider replacement wheels, the radial may be viable. A quick wheel-width measurement before tire selection can prevent a mismatch that would only show up after the tires arrive.

A 1948 Holden should be stored in a cool, dry, dark space away from direct sunlight, electric motors, battery chargers, furnaces, and other ozone sources that age rubber. Tire pressures should be maintained during storage, and the car should be rolled periodically or supported in a way that avoids leaving the full load on one footprint for months at a time. Bias-ply tires are especially prone to temporary flat-spotting after long static periods.

That matters even more when a 1948 Holden is driven only occasionally, because age and storage conditions usually affect collector tires more than mileage does. If your car wears 550-15 bias-ply tires, a careful storage routine helps preserve ride quality and sidewall condition. If it uses 155R15 radials, the same environment still matters, but the tire may recover from long parking differently than a bias-ply version would.

Tires on a 1948 Holden should be judged more by age and condition than by tread wear alone. A sound rule for collector vehicles is to begin evaluating tires closely once they reach roughly five to seven years of age and to consider replacement around ten years, even if they still look presentable. The DOT date code on the tire sidewall is the starting point for that timeline.

Many 1948 Holden cars cover modest annual mileage, so an older tire can seem fine simply because the tread is still deep. That can be misleading if the rubber has hardened, cracked, or lost resilience with time. Looking at age, storage history, sidewall condition, and how well the tire still holds pressure gives you a far better picture of serviceability than mileage alone on a low-use historic car.

Tires on a 1948 Holden should be inspected before every drive and again before any longer trip. The key checks are inflation pressure, visible sidewall cracking, cuts, bulges, tread irregularity, and any sign that the tire has been run low. If your chosen tire setup includes tube-type construction, valve stems and any signs of slow leakage deserve extra attention.

A pre-drive walkaround is particularly worthwhile on a 1948 Holden because the car’s age means tire condition is only one part of overall road readiness. Short local drives can hide a problem that becomes more serious once the car is run at sustained speed or loaded for a longer outing. Frequent inspections also help you catch alignment or suspension-related wear before it shortens the life of a fresh set of tires.

A 1948 Holden 48/215 would have been originally associated with bias-ply tire construction rather than radial construction, which reflects standard passenger-car practice for the late 1940s. Among the available choices here, the 550-15 bias-ply is the closest match in construction type to that period. Radial 155R15 options represent a later-style alternative rather than the original construction approach.

For an owner restoring a 1948 Holden to a factory-minded presentation, construction type is usually the first authenticity checkpoint. Size, sidewall appearance, and market-specific details can also matter, so a Holden club or marque specialist is the best next step if the car is being prepared for highly scrutinized judging. That added research is especially worthwhile when originality standards go beyond general era correctness.

Correct tire fitment absolutely matters when showing a 1948 Holden, especially in classes where authenticity is judged closely. Judges commonly notice whether the tire’s size, construction type, and sidewall appearance suit the age and character of the car. A modern radial on a car presented as factory-authentic can attract attention in the same way an obviously incorrect sidewall treatment would.

For a 1948 Holden 48/215, the safest show-minded route is to treat the tire as part of the restoration, not just a maintenance item. Even when a radial fits and drives acceptably, it may send a different visual and historical message than a 550-15 bias-ply. Event rules vary, so owners chasing maximum judging accuracy should compare their tire choice against Holden-club standards before the car reaches the show field.

For a 1948 Holden using 155R15 radial tires, both the Michelin XAS and Michelin XAS-FF appear in 155HR15 form with an H speed rating, which corresponds to 130 mph. Both are blackwall radials for 15-inch rims and list the same 4.00- to 5.50-inch rim width range. The main visible setup difference is that one is marked TT for tube type and the other TL for tubeless.

That distinction makes wheel compatibility the first issue to settle before choosing between them. A 1948 Holden owner comparing these two products is not really choosing between different speed classes or different wheel diameters, but between two closely related radial options with different inflation-system assumptions. Once your wheel type is confirmed, the correct one usually becomes much easier to identify.

1948 Holden tires can be suitable for highway use when they are the correct size, properly installed, correctly inflated, and in sound condition. The available 155R15 radial choices include T-rated versions up to 118 mph and H-rated versions up to 130 mph, while the 550-15 bias-ply listing does not carry a speed symbol in the available markings. On a car of this age, the tire is only part of the highway-readiness equation.

A well-sorted 1948 Holden often reaches the limits of braking, suspension condition, steering wear, and general mechanical age long before it approaches the upper ceiling shown by a modern radial speed symbol. That is why highway confidence comes from the complete setup rather than from one number on the sidewall. If the car will be used regularly on faster roads, the entire chassis and running gear deserve the same scrutiny as the tires.

Inflation pressure for a 1948 Holden should start with the vehicle manufacturer’s original recommendation for the size and wheel setup being used, then be checked against the tire maker’s specifications for the exact product. Within the available choices, one 155R15 radial lists a maximum load capacity of 1045 pounds at 44 psi. That figure is a tire rating limit, not a universal running pressure for every 1948 Holden tire option.

The important point is not to transfer one tire’s pressure figure to a different size or construction. A 550-15 bias-ply should be treated according to its own application, and even among 155R15 radials, different products may have different construction details and intended setups. If the car’s manual, your wheel type, and the tire maker’s guidance do not point to the same obvious answer, it is worth resolving that before regular use.

Before a longer drive in a 1948 Holden, inspect each tire for cracking, cuts, bulges, irregular wear, and proper inflation, and check that the spare is usable and holds air. If your chosen tire is tube type, include the valve stems and any signs of slow pressure loss in the inspection. Tire age should also be part of the pre-trip decision, even if the tread still looks good.

A longer outing in a 1948 Holden should also include the broader checks any postwar collector car deserves: wheel fastener security, steering and suspension feel, brake operation, and fluid condition. Tires are only one link in the chain, but they are the only part of the car actually touching the road. Spending a few minutes on those checks before departure is far easier than dealing with a preventable failure once the trip is underway.