1948 Oldsmobile Tire Fitment Guide

1948 Oldsmobile vehicles use five sizes across four model groups: 600-16 for the Deluxe 66, 6.50-15 and 760-15 for the Deluxe 68, 650-16 and 760-15 for the Deluxe 76 and 78, and 650-16 plus 820-15 for the Deluxe 98. All of them are bias-ply sizes, but they do not share one common wheel diameter. The 600-16 and 650-16 sizes mount on 16-inch rims, while 6.50-15, 760-15, and 820-15 mount on 15-inch rims. Published rim-width ranges include 4.00 to 4.50 inches for 600-16, 4.50 to 5.00 inches for 650-16, 5.50 to 6.00 inches for 760-15, and 6.00 to 6.50 inches for 820-15.

That spread means a buyer cannot choose by year and make alone. The first step is identifying the exact Oldsmobile model and then confirming whether the car is on 15-inch or 16-inch wheels, especially on models that appear with more than one size. Once the correct size is established, the next decisions are sidewall appearance and brand preference rather than switching between radial and bias-ply construction, since every listed fitment here stays within the period-correct bias-ply category.

On a 1948 Oldsmobile, 600-16 is a traditional numeric bias-ply tire size. The 600 portion is the nominal section width designation used in period sizing, and the 16 means the tire fits a 16-inch rim. Within the 1948 Oldsmobile range, that size is associated with the Deluxe 66. Available versions include blackwall and wide whitewall examples, and listed rim-width guidance for many 600-16 products falls in the 4.00 to 4.50 inch range.

That size code tells you more about era and wheel fit than it does in modern metric terms. If your Oldsmobile is a Deluxe 66, 600-16 is the size to verify against the wheel and the existing tire before you compare brands or sidewall treatments. If your car is another 1948 Oldsmobile model, the same 16-inch rim diameter does not automatically mean 600-16 is correct, because other models in the line use different section widths or move to 15-inch fitments.

No, 1948 Oldsmobile models do not all use the same tire size. The Deluxe 66 uses 600-16, the Deluxe 68 uses 6.50-15 and 760-15, the Deluxe 76 and 78 use 650-16 and 760-15, and the Deluxe 98 uses 650-16 and 820-15. That means there is variation not only in width designation but also in rim diameter across the lineup. Some sizes are shared by two model groups, but no single size fits every 1948 Oldsmobile listed here.

The practical result is that model identification matters before tire selection. A buyer working from a title, memory, or general year-make reference can easily land on the wrong tire if the exact series is not confirmed first. On a postwar Oldsmobile, that can affect overall look, wheel compatibility, and whether the tire visually suits the car's place in the lineup, so it is worth checking the existing wheel and any original fitment references for your specific model.

1948 Oldsmobile tires are available in several period-style sidewall treatments depending on size. The 600-16 size appears in blackwall and wide whitewall form, 760-15 in narrow whitewall and wide whitewall, 650-16 in blackwall and wide whitewall, and 820-15 in blackwall, narrow whitewall, and wide whitewall. That range matters because late-1940s American cars often look quite different depending on whether they wear a plain blackwall or a more formal whitewall treatment. The sidewall choice changes appearance more than it changes fitment.

For restoration work, sidewall style should match the character of the car and the presentation you want. A wide whitewall usually gives a more upscale late-1940s look, while blackwalls can suit a more restrained or service-replacement appearance. If you are preserving a senior-series Oldsmobile or building a more formal show presentation, the sidewall treatment often becomes one of the most noticeable visual details on the car, so it is worth choosing with the same care as the size itself.

Several brands cover 1948 Oldsmobile fitments, depending on size. The 600-16 size includes BFGoodrich, Coker Classic, Firestone, and Avon. The 760-15 size includes BFGoodrich, Coker Classic, and Universal Vintage Tire, while 650-16 includes BFGoodrich, Coker Classic, Firestone, and Garfield. The 820-15 size includes BFGoodrich, Firestone, and US Royal. All of those offerings stay within the bias-ply category for this year and make.

Brand choice usually comes down to appearance details, load listing, and how closely a particular tread and sidewall presentation suits your Oldsmobile. A buyer comparing options within one size should look at whitewall width, blackwall versus whitewall styling, and any stated rim-width or load information before deciding. That approach keeps the decision focused on the details that matter for a collector car instead of treating every reproduction bias-ply tire as interchangeable.

For a 1948 Oldsmobile in 760-15, BFGoodrich and Coker Classic both offer bias-ply tires for 15-inch rims, and both list versions with whitewall styling. BFGoodrich appears in both a 3.375-inch wide whitewall and a 1.00-inch narrow whitewall, while Coker Classic appears in a 3.00-inch whitewall. Listed load figures on the wide-whitewall versions reach 1710@32 psi for both BFGoodrich and Coker Classic, and both brands show a 5.50 to 6.00 inch rim-width range on those products.

That means the main difference is visual presentation rather than a major shift in fitment category. If your Oldsmobile calls for 760-15, the whitewall width and brand styling are likely to shape the choice more than construction, since both are bias-ply offerings for the same wheel diameter. Buyers trying to match a specific restoration look should compare the sidewall treatment carefully, because a narrow whitewall and a broad late-1940s whitewall create very different overall impressions.

Published rim-width guidance for 1948 Oldsmobile tires varies by size. The 600-16 size is listed for 4.00 to 4.50 inch rims, 650-16 for 4.50 to 5.00 inch rims, 760-15 for 5.50 to 6.00 inch rims, and 820-15 for 6.00 to 6.50 inch rims. Those ranges track with the way the Oldsmobile lineup stepped from smaller-series cars to larger applications. Rim diameter also changes by size, so width and diameter both have to be checked together.

The safest way to use those numbers is as a wheel-confirmation step before selecting a tire, not after. If your car has replacement wheels or has been apart during restoration, measure the actual wheel and verify the stamped or known rim size before moving ahead. That matters especially on Deluxe 68, Deluxe 76 and 78, and Deluxe 98 models, where more than one tire size appears within the same model group and the correct wheel setup should guide the final choice.

The listed 1948 Oldsmobile tire offerings are all bias-ply products, but the tire descriptions here do not show a uniform tube marker across every size and product. Because of that, tube use should be confirmed on the specific tire and wheel combination you plan to run rather than assumed from the size alone. On late-1940s applications, tube-type fitment is common enough that it deserves attention during setup, especially if the wheels are original or restored factory pieces.

That makes wheel condition just as important as tire choice. If the wheel is designed for tube use, or if the selected tire is marked for tube-type service, make sure the tube and valve-stem hardware match the rim and tire correctly. Buyers working with original steel wheels should also inspect the wheel interior for rust, pitting, burrs, or old repairs before mounting, since those issues can affect tube life and overall reliability on a collector car.

A 1948 Oldsmobile should be stored away from direct sunlight, electric motors, furnaces, welders, and other ozone-producing equipment that can age sidewalls. Keep the car on a clean, dry surface and maintain proper inflation so the casing is not sitting under-inflated for long periods. Because all listed fitments are bias-ply, they are more prone to temporary flat-spotting during long static storage than a modern radial would be. Periodic movement or careful support under the suspension can help reduce that effect.

Good storage habits preserve both appearance and ride quality. If the Oldsmobile will sit for months at a time, inspect the sidewalls before the next drive and allow the tires to warm and round out gradually on the road. A dark, cool garage and regular pressure checks do more for tire longevity than most owners realize, especially on a postwar car that may spend far more time parked than driven.

Tires on a 1948 Oldsmobile should be judged by age and condition more than mileage. Collector vehicles often accumulate very few miles, but rubber still hardens and ages over time. A practical rule is to begin evaluating more closely once tires reach the five- to seven-year range and to treat around ten years as a serious replacement point, even if tread depth still looks usable. The DOT date code on the tire is the starting point for understanding age, followed by a careful inspection of the casing and sidewalls.

That matters because an old-looking tire is not the only warning sign. A low-mileage Oldsmobile can still have aged rubber, internal deterioration, or sidewall checking that makes continued road use a poor idea. If the car's history is unclear, many owners choose replacement simply to reset the clock and eliminate guesswork. For a collector car that may see occasional touring, age-related condition is far more important than whether the tread appears barely worn.

Tires on a 1948 Oldsmobile should be inspected before every drive and again before any longer outing. Look for sidewall cracking, tread separation, cuts, bulges, irregular wear, and pressure loss, and give extra attention to the valve stems if the wheel and tire setup uses tubes. Because these cars are often driven infrequently, they can develop age-related issues while parked that would be obvious on a quick inspection. A bias-ply tire that has sat for a while also deserves a visual check for flat-spotting or casing distortion before road speed increases.

A short pre-drive walkaround can prevent the most common collector-car tire problems. Many issues show up first as a soft tire, a new crack near the bead, or a sidewall change that is easy to miss if the car is simply backed out and driven away. On a postwar Oldsmobile, tire inspection should be part of the same routine as checking fluids, lights, and brake feel, especially before club events or highway mileage.

A 1948 Oldsmobile Deluxe 66 would have been fitted in the bias-ply era, and the listed size associated with that model is 600-16. That aligns with postwar American practice, when bias-ply construction was standard equipment and radial fitments had not yet become common in the U.S. passenger-car market. Reproduction offerings in 600-16 include blackwall and wide whitewall versions, which gives restorers flexibility depending on the exact presentation they are trying to match.

For a strict restoration, the key is matching size, construction type, and sidewall appearance to the car's intended market and trim presentation. A marque club, factory literature, or period photography can help confirm whether your specific Deluxe 66 should wear a blackwall or a whitewall look. The safest approach is to treat 600-16 bias-ply as the foundation and then refine the sidewall choice to suit the restoration standard you are aiming for.

Correct tire fitment matters on a 1948 Oldsmobile because judges and knowledgeable enthusiasts often notice tire size, construction, and sidewall style immediately. A Deluxe 66 wearing the wrong diameter, a Deluxe 98 wearing the wrong section width, or a sidewall treatment that clashes with a late-1940s luxury presentation can stand out quickly. Since every listed fitment here is bias-ply, staying within the proper size family already keeps a restoration closer to period expectations than substituting a visibly modern alternative.

The level of importance depends on the event. Local cruise-ins may reward overall presentation, while marque or concours judging is more likely to scrutinize details such as whether the tire size belongs to the correct model group and whether the whitewall style looks appropriate for the era. If show accuracy is a priority, confirm your specific model's size first and then compare sidewall style carefully against period references and club guidance before making a final choice.

For a 1948 Oldsmobile in 650-16, BFGoodrich and Firestone both offer bias-ply tires for 16-inch rims, but they differ in presentation and some published details. BFGoodrich appears as a 3.75-inch whitewall with a listed load figure of 1580@32 psi and a 4.50 to 5.00 inch rim-width range, while Firestone appears in blackwall form with the same 1580@32 psi load figure and the same 4.50 to 5.00 inch rim-width range. The listed product weights also differ slightly, with BFGoodrich at 24 pounds and Firestone at 23 pounds.

That comparison is useful when a restoration is chasing a specific visual outcome. If your Oldsmobile needs 650-16, the decision between those two products is less about basic fit and more about whether you want a whitewall or a blackwall appearance on the finished car. Since the rim-width guidance and stated load figure align, a buyer can focus on brand styling, sidewall treatment, and how that look suits a Deluxe 76, 78, or 98 restoration.

1948 Oldsmobile tires can be suitable for highway driving when the correct size is chosen, the tires are in sound condition, and the car itself is mechanically sorted. The listed fitments are bias-ply products, and one 600-16 Avon product carries an H speed rating, which corresponds to 130 mph, while many other listed products do not display a speed letter in the size marking shown here. In real use, a postwar Oldsmobile's brakes, steering, suspension, and overall condition are usually more relevant to safe highway travel than the theoretical top-speed capacity of the tire alone.

That means the right question is not just whether the tire can handle highway speed, but whether the entire car is ready for sustained road use. Bias-ply tires will also feel different from modern radials, with more sensitivity to grooves and crown changes and a period-correct driving character that rewards moderate, attentive operation. Before extended highway use, make sure the Oldsmobile tracks properly, stops evenly, and is wearing tires that are correctly inflated and free of age-related defects.

Several 1948 Oldsmobile tire sizes include published load-and-pressure figures, but those numbers should not be treated as a universal inflation recommendation across the whole lineup. Examples include 600-16 at 1400@32 psi, 650-16 at 1580@32 psi, 760-15 at 1710@32 psi, and 820-15 at 1920@32 psi on listed products. Those values show the pressure tied to a stated load capacity for that specific tire, not necessarily the pressure Oldsmobile called for in every driving condition. Factory operating pressure should be checked against the owner's manual or period service literature for the exact model.

The practical approach is to start with the vehicle manufacturer's specification for the correct size on your exact model, then compare that against the tire maker's guidance for the reproduction tire you are using. Do not transfer a pressure figure from a 16-inch size to a 15-inch size or from one model series to another just because they are all 1948 Oldsmobiles. Inflation affects ride, wear, and casing behavior, so it is worth matching the pressure strategy to the exact tire and car.

Before taking a 1948 Oldsmobile on a longer drive, inspect every tire for sidewall cracking, cuts, bulges, uneven wear, and proper inflation, and do not forget the spare. If your wheel-and-tire setup uses tubes, pay attention to valve stems and any signs of slow air loss. The tire should also be the correct size for the model, since this year Oldsmobile range includes both 15-inch and 16-inch applications. A tire that looks acceptable in the garage can still become a problem once heat and speed build on the road.

Tire checks should be part of a broader pre-trip review on a car of this age. Confirm lug torque, wheel condition, steering feel, brake response, fluid levels, and lights before you head out. On a late-1940s Oldsmobile, long-distance confidence comes from treating the tire as one element in the overall touring equation, not as a separate concern. A few extra minutes in the garage usually tell you whether the car is ready for a relaxed drive or needs attention first.