1948 Oldsmobile Deluxe 76 & 78 Tires

A 1948 Oldsmobile Deluxe 76 & 78 uses two primary tire sizes: 650-16 and 760-15. Both are bias-ply sizes, but they do not share the same wheel diameter, since 650-16 is for a 16-inch rim and 760-15 is for a 15-inch rim.

That makes wheel confirmation the first step before choosing any tire. Once the rim diameter is verified, the next decision becomes sidewall style, tire series, and whether the car will stay with a traditional bias-ply setup or, in the case of 760-15, be compared against available radial-equivalent alternatives.

The 1948 Oldsmobile Deluxe 76 & 78 can use either a 16-inch rim with 650-16 tires or a 15-inch rim with 760-15 tires. Since both rim diameters are associated with this model, there is not one single wheel diameter that applies to every car without checking the actual setup.

A quick look at the wheel and existing tire size usually settles the question, but modified cars deserve extra attention. If the Oldsmobile has had wheels changed over the years, confirm both diameter and width before selecting tires, especially if moving toward a different sidewall treatment or a radial-equivalent option.

On a 1948 Oldsmobile Deluxe 76 & 78, 760-15 is a vintage numeric bias-ply size. The 7.60 refers to nominal section width in inches, while the 15 designates the wheel diameter, so it is a tire intended for a 15-inch rim rather than a modern metric radial sizing format.

Understanding that older numbering system helps when comparing product choices and radial equivalents. It also prevents confusion with later metric sizes, since a 760-15 bias-ply is not simply selected by matching the last number alone; wheel width, overall tire dimensions, and clearance still need to be reviewed.

For the 1948 Oldsmobile Deluxe 76 & 78, 760-15 is a primary bias-ply tire size. That means the original-style fitment uses bias-ply construction, even though radial-equivalent alternatives are available in other size formats for owners who want to compare construction choices.

Keeping the bias-ply size usually supports a more traditional driving feel and period-style appearance. Changing to a radial equivalent is a separate decision, and it should include checks for wheel width, tire dimensions, and clearance rather than assuming every 15-inch wheel setup will behave the same way.

Radial equivalents for 760-15 include 215R15, P225/75R15, P235/70R15, and 760R15. Those represent an 80-series metric radial, a 75-series P-metric radial, a 70-series P-metric radial, and a bias-look radial equivalent, giving the 1948 Oldsmobile Deluxe 76 & 78 several different radial-style paths to consider.

Each option uses a different sizing convention, so the comparison is about more than just matching a 15-inch rim. A 6-8 inch recommended rim-width range is associated with these equivalents, and the car's wheel width, tire clearance, and overall setup should be reviewed before choosing one of them.

Start by confirming that the car is actually using the 760-15 fitment, since that is the primary size with radial-equivalent choices. Then compare the radial option under consideration against the car's wheel diameter, wheel width, and the space available around the fenders, steering components, and suspension.

Construction change is only part of the decision on a postwar Oldsmobile. It also helps to think about the intended result, whether that means a more traditional visual presentation with a 760R15 bias-look radial or a more modern metric or P-metric radial format with a different appearance profile.

The main considerations for a 760-15 tire are confirming the 15-inch wheel setup, staying with the correct bias-ply primary fitment, and deciding what look suits the car best. This size is available in classic series from BFGoodrich, Coker Classic, Universal Vintage Tire, and Goodyear, with different whitewall presentations.

After the fitment basics are settled, compare the details that affect how the car presents and how the tire matches the wheel. Whitewall width, tire series, rim-width specification, and whether a radial-equivalent alternative is even part of the plan all matter more here than simply picking the first 760-15 available.

Tires for the 1948 Oldsmobile Deluxe 76 & 78 are available in several sidewall styles, including blackwall, narrow whitewall, and wide whitewall. The mix depends on size, with 650-16 offering blackwall and wide whitewall choices, while 760-15 includes both wide whitewall and narrow whitewall options.

Sidewall treatment changes the car's look as much as the wheel cover or paint trim on a late-1940s sedan. A blackwall gives a plainer, more understated presentation, while whitewall choices lean more formal and restoration-oriented, so the right answer depends on the appearance the owner wants rather than tire size alone.

Available brands for the 1948 Oldsmobile Deluxe 76 & 78 include BFGoodrich, Coker Classic, Firestone, Garfield, Lester, Goodyear, Universal Vintage Tire, STA, Tornel, and Excelsior. Brand availability varies by size, with the broadest assortment appearing in 650-16 and a smaller but still useful selection in 760-15.

Brand should be compared alongside the tire series, sidewall style, and wheel requirements rather than treated as the only decision point. On a car like this, one brand may offer the whitewall presentation you want while another may align better with the wheel width or overall visual character of the restoration.

A period-style choice starts with using the correct primary size for the wheel on the car, either 650-16 or 760-15, and keeping the bias-ply construction that belongs to this Oldsmobile's original era. From there, the decision usually comes down to whether a blackwall or whitewall presentation better matches the restoration's intended look.

Owners pursuing exact originality should compare their car against marque references, restoration photos, and period documentation before settling on a specific sidewall treatment or tire series. For many drivers, though, the right period-style tire is simply the one that preserves the proper size, construction, and visual balance of the car.

Tire construction affects both the visual stance and the overall character of a restored 1948 Oldsmobile Deluxe 76 & 78. A bias-ply tire keeps the car in its original-era construction style, while a radial alternative, where available for 760-15, can change the way the sidewall and general tire profile present on the vehicle.

That does not automatically make one choice right and the other wrong. A restoration-minded owner usually looks at how the tire complements the wheel, whitewall treatment, and overall presentation of the car, then balances that appearance goal against the desire to explore modern radial-equivalent options.

Yes, modifications can affect tire fitment on a 1948 Oldsmobile Deluxe 76 & 78. Wheel swaps, changed wheel widths, altered ride height, suspension work, or body modifications can all influence whether a 650-16, 760-15, or a 760-15 radial equivalent still has the clearance and wheel compatibility the car needs.

That matters especially on an older car that may have been updated more than once over the years. Even when the tire size sounds correct, it is smart to verify wheel diameter, inner and outer clearance, and steering travel before finalizing a choice for a modified Oldsmobile.

Before driving a 1948 Oldsmobile Deluxe 76 & 78 on new tires, inspect the wheels for correct diameter and condition, make sure the tires are inflated properly for their intended use, and confirm there is no rubbing at the fenders or steering components. Lug hardware and overall wheel seating also deserve a careful look.

A short, slow test drive is a sensible next step on a collector car. Listen for contact, pay attention to steering feel, and recheck air pressure after the first miles, especially if the car has sat for long periods or if the new tires involve a different sidewall treatment or construction choice.

Collector-car tires in 650-16 or 760-15 should be maintained with regular pressure checks, routine visual inspection, and careful storage habits. On a 1948 Oldsmobile Deluxe 76 & 78 that is driven occasionally, it is important to watch for sidewall cracking, tread damage, bulges, flat spotting, or slow air loss.

Older cars often spend long stretches parked, so tire age and storage conditions matter as much as tread depth. Keeping the Oldsmobile away from prolonged sunlight, moisture, and ozone sources can help preserve the tires, and any questionable condition should be reviewed before putting the car back on the road.