1948 Cadillac Tire Fitment Guide

1948 Cadillac vehicles use two tire sizes. The 60 Series, 61 Series, and 62 Series use 820-15 tires on 15-inch rims, while the 75 Series uses 750-16 tires on 16-inch rims. For 820-15, the available rim-width range is 6.00 to 6.50 inches. For 750-16, the available rim-width range is 5.00 to 6.00 inches on products where rim-width guidance is given.

That split means year and make alone are not enough for a confident tire choice on a 1948 Cadillac. Owners of 60, 61, and 62 Series cars can focus on sidewall style and brand within 820-15, while 75 Series owners need to stay with the larger 16-inch fitment family. If the car has changed hands several times or has restoration history, it is worth checking the wheel itself before selecting a tire.

On a 1948 Cadillac, 820-15 is a vintage numeric bias-ply tire size. The 820 portion refers to the nominal section-width class used in period sizing, and the 15 refers to the wheel diameter in inches. In the 1948 Cadillac range, that size belongs to the 60 Series, 61 Series, and 62 Series rather than the 75 Series.

Modern buyers often expect a metric width and aspect ratio, but that is not how this older system was written. The important takeaway is to match the exact vintage size family and the 15-inch wheel diameter, then decide whether the appearance should be blackwall, narrow whitewall, or wide whitewall. That keeps the car visually appropriate without crossing into the wrong chassis fitment.

On a 1948 Cadillac, 750-16 is also a vintage numeric bias-ply tire size. The 750 identifies the period section-width class, and the 16 identifies a 16-inch wheel diameter. Within the 1948 Cadillac lineup, this size is used by the 75 Series and is not interchangeable with the 15-inch passenger-car fitment without a wheel change.

That distinction matters because the 75 Series sits on a different chassis type from the 60, 61, and 62 Series cars. When shopping within 750-16, the more useful comparison is sidewall appearance and brand choice rather than trying to compare it directly with 820-15. Confirming that the car still carries its proper 16-inch wheels is the cleanest first step.

1948 Cadillac tires are available in several sidewall styles, but the range depends on size. In 820-15, choices include blackwall, narrow whitewall, and wide whitewall. In 750-16, choices include blackwall and wide whitewall. All of the available fitments for 1948 Cadillac in these sizes are bias-ply tires, so the styling decision is mainly about the car’s look and restoration direction rather than construction type.

For a formal late-1940s luxury car such as a Cadillac, whitewall presentation is often a major part of the finished appearance. A blackwall can suit a more restrained look, while narrow and wide whitewalls change the visual character considerably. Owners concerned with show presentation should compare the sidewall treatment to period photographs, survivor cars, and marque-specific judging guidance before settling on a final style.

Several brands cover 1948 Cadillac fitments. In 820-15, available brands include BFGoodrich, Firestone, and US Royal. In 750-16, available brands include Firestone, Lester, and BFGoodrich. Each stays within bias-ply construction, so the differences here center more on brand lineage, sidewall presentation, and individual product details than on a shift between vintage and modern construction types.

That gives owners flexibility to match the character of the car to the look they want. Some restorers prefer a historically familiar American brand name on a postwar Cadillac, while others focus first on the whitewall treatment that best suits the car’s stance and trim. Once the correct size is confirmed, comparing the available brands within that size is the practical next step.

Within the 1948 Cadillac fitments, BFGoodrich and Firestone both offer bias-ply choices, but the details vary by size and styling. In 820-15, BFGoodrich appears in both blackwall and narrow whitewall form at 1920 pounds maximum load at 32 psi, while Firestone also offers blackwall at the same 1920-pound and 32-psi rating. In 750-16, BFGoodrich wide whitewall is rated at 1850 pounds at 48 psi, while Firestone appears in blackwall and wide whitewall with a 1660-pound rating at 40 psi.

Those differences are most useful when you are comparing tires within the same size, not across the two Cadillac chassis families. A 60, 61, or 62 Series owner should compare 820-15 options against one another, while a 75 Series owner should stay within 750-16 choices. If load and pressure markings matter to your selection, read the exact sidewall specification for the product you are considering rather than assuming all versions of a size are identical.

1948 Cadillac rim-width guidance depends on the tire size. For 820-15, the listed rim-width range is 6.00 to 6.50 inches. For 750-16, the listed rim-width range is 5.00 to 6.00 inches on products that include rim-width guidance. Those figures align with the two different wheel diameters used across the Cadillac range for 1948.

That makes wheel verification an important part of the process, especially on restored cars where wheels may have been swapped over the decades. Even when the diameter is correct, the rim should still fall within the recommended width range for the specific tire size being used. If the wheel has been repainted or modified and its dimensions are uncertain, measuring the rim before fitting tires is a sensible precaution.

The available 1948 Cadillac products in 820-15 and 750-16 are presented as bias-ply tires, but the tube status is not consistently called out in the size markings shown here. For a vintage fitment of this era, tube use often depends on the wheel design and the exact tire being selected rather than on the size name alone. The safest reading is to confirm the sidewall marking and the wheel type together before final setup.

That matters most on original or restored postwar wheels, where tube use may be part of the intended assembly. When fitting any 1948 Cadillac tire, inspect the condition of the wheel, valve-stem area, and rim surface at the same time. If the car is being judged for authenticity or returned to factory-style configuration, a Cadillac specialist or marque club can help confirm the most appropriate tube practice for the specific model and wheel.

A stored 1948 Cadillac should be kept away from direct sunlight, standing moisture, and ozone-producing equipment such as electric motors or welders. Bias-ply tires are especially prone to flat-spotting when they sit in one position for long periods, so periodic movement or properly supporting the vehicle during longer storage can help reduce stress on the casing. Clean, dry floors and stable temperatures also help preserve the sidewalls.

For a collector Cadillac that may sit between shows or occasional drives, storage habits matter as much as tread depth. Keep the tires at the correct pressure for storage, avoid letting the car rest for months on underinflated tires, and inspect whitewalls carefully for staining or cracking before the next outing. A little preventive attention goes a long way with vintage bias-ply construction.

On a 1948 Cadillac, tire age usually matters more than mileage because many collector cars are driven sparingly. A sensible rule is to begin evaluating tires closely once they reach roughly five to seven years of age and to treat around ten years as a serious replacement consideration, even if the tread still looks serviceable. The DOT date code, if present on the tire, is the best quick reference for age.

Bias-ply tires can look presentable long after age has started to affect the rubber, especially on cars that spend much of their time indoors. Sidewall condition, bead integrity, and the tire’s ability to hold pressure consistently are all more meaningful than odometer miles on a low-use Cadillac. If the car’s history is uncertain, assume age deserves a closer look before regular road use.

Tires on a 1948 Cadillac should be inspected before every drive and again before any longer outing at road speed. Look for sidewall cracking, tread separation, bulges, punctures, irregular wear, and any sign that a tire is losing pressure between uses. On an older wheel-and-tire assembly, the valve stem and bead area also deserve a close inspection because age-related issues often begin there.

That routine matters even more on a heavy postwar luxury car, where a small tire problem can become a larger drivability issue quickly. If the Cadillac has been parked for weeks, roll it a short distance and recheck each tire visually before heading out. Making inspection part of the pre-drive ritual is one of the simplest ways to protect both the car and the trip.

A 1948 Cadillac 62 Series would have been fitted in the bias-ply era, and the correct size family for that model is 820-15. That aligns with how late-1940s American luxury cars were originally equipped before radial passenger-car tires became standard much later. While brand preference can vary by restoration philosophy, the key original-type traits are the correct size, bias-ply construction, and an era-appropriate sidewall style.

For most restorations, getting those fundamentals right matters more than chasing a brand assumption that may have varied by delivery market or dealer practice. Owners seeking show-level accuracy should compare surviving period photos, factory literature, and Cadillac club guidance to decide whether blackwall, narrow whitewall, or wide whitewall is most appropriate for their exact car. That is especially useful when trim level, body style, or event rules influence judging.

Correct tire fitment absolutely matters when a 1948 Cadillac is judged for authenticity. Size, construction type, rim diameter, and sidewall appearance all affect whether the car presents as period-correct. A 60, 61, or 62 Series shown on 750-16 tires, or a 75 Series shown on 820-15 tires, would immediately fall outside proper fitment. Sidewall treatment can also influence whether the finished car looks authentic for the era.

For a strong restoration result, start by matching the correct model to the correct tire size, then refine the look with the whitewall width or blackwall style that best matches your restoration goal. Event-specific judging standards can be more particular than general enthusiast expectations, so marque clubs and Cadillac judging manuals remain the best reference for final presentation details. Getting the basics right first keeps the car on solid ground.

In 1948 Cadillac 820-15 fitment, the available US Royal example is a 3.50-inch wide whitewall bias-ply tire rated at 1920 pounds at 32 psi, while BFGoodrich appears as both a blackwall and a 1.00-inch narrow whitewall, also rated at 1920 pounds at 32 psi. All are built for 15-inch rims with a listed rim-width range of 6.00 to 6.50 inches. The main difference is visual presentation rather than a change in chassis fitment.

That means the choice comes down to how formal or restrained you want a 60, 61, or 62 Series Cadillac to appear. A narrow whitewall gives a subtler period look, while a wider whitewall creates a more pronounced late-1940s luxury statement. Since the load and rim specifications align closely in this comparison, sidewall style becomes the most meaningful deciding factor for many restorers.

The available 1948 Cadillac tires are vintage-style bias-ply products, and no speed ratings are shown in these size markings. A sound, properly fitted bias-ply tire can be used for normal road driving within the broader limits of the vehicle, but a 1948 Cadillac’s braking, steering, suspension design, and overall age matter just as much as the tire itself. Highway use should always reflect the condition of the complete car, not just the tires.

That practical limit is important on postwar luxury cars, which can feel stable at speed but still operate with period mechanical systems. Before regular highway use, confirm tire condition, inflation, wheel integrity, and front-end health together. Owners planning longer interstate driving often benefit from a conservative pace and frequent checks, especially if the car has been inactive for extended periods.

Inflation pressure on 1948 Cadillac tires should begin with the vehicle’s factory recommendation for the specific model, then be checked against the reproduction tire’s own maximum load and pressure marking. In the available products, 820-15 examples are listed at 1920 pounds at 32 psi. In 750-16, listed examples include 1660 pounds at 40 psi and 1850 pounds at 48 psi, depending on the product.

Those figures are not a blanket instruction to inflate every tire to its maximum marked pressure. The right working pressure for ride, wear, and handling should reflect the Cadillac model, vehicle loading, and the tire manufacturer’s guidance for that specific size and construction. Treat each size independently and avoid carrying a pressure assumption from 820-15 over to 750-16 or vice versa.

Before a longer drive in a 1948 Cadillac, inspect all five tires if a spare is carried, including the sidewalls, tread, valve stems, and pressure retention. Look for cracking, cuts, bulges, uneven wear, and any signs of age-related separation. On a bias-ply collector tire, even a car that looks well-kept can develop problems while sitting, so visual condition and air retention both matter.

Tires are only one part of a proper pre-trip check on a car of this age. Wheel fastener security, steering feel, brake operation, and the general health of the suspension should all be reviewed before committing to a longer route. A careful inspection at home is easier than troubleshooting an avoidable tire or wheel issue on the roadside in a heavy late-1940s Cadillac.