1948 De Soto Custom & Deluxe Tires

The 1948 De Soto Custom & Deluxe uses three primary bias-ply tire sizes: 700-15, 760-15, and 650-16. Those sizes are not universal across every covered configuration, and they also span two different rim diameters, with 700-15 and 760-15 on 15-inch rims and 650-16 on a 16-inch rim.

That means the correct starting point is not simply picking a De Soto tire by year and model name. The exact sub-model and the actual wheels on the car need to be confirmed first, especially on a vehicle that may have had wheels changed during restoration or long-term ownership. Once the size and rim diameter are verified, the next decision is appearance and usage, such as blackwall, wide whitewall, or a radial-equivalent path for 760-15.

A 1948 De Soto Custom & Deluxe can use either a 15-inch or 16-inch rim, depending on the tire size fitted to the specific configuration. The 700-15 and 760-15 sizes use 15-inch rims, while the 650-16 size uses a 16-inch rim.

Rim diameter is the first thing to verify because a correct-looking vintage tire in the wrong diameter will not mount properly. It is also worth checking actual wheel width before making a final choice, since available products within these sizes can have different rim-width specifications. On a collector car, especially one restored years ago, measuring the wheel can be more reliable than assuming the car still has its original setup.

The 1948 De Soto Custom & Deluxe has more than one tire size because fitment varies within the covered sub-model range. Some versions use 700-15 and 760-15 on 15-inch rims, while the 7 Passenger version is also associated with 650-16, which moves the car to a 16-inch rim.

For the owner, that makes identification more important than broad vehicle labeling. The right tire depends on the exact sub-model and on what wheels are actually on the car today. That matters even more when a car has been restored, modified, or assembled from mixed components over time. A quick check of the wheel diameter and existing tire markings can prevent ordering a tire that matches the model family but not the actual vehicle.

On the 1948 De Soto Custom & Deluxe, 760-15 is a primary bias-ply tire size. The available products in that original size use bias-ply construction, which keeps the tire in the same general vintage format associated with the car's period appearance and wheel fitment.

That does not mean radial choices are off the table, but they fall into the equivalent category rather than the primary fitment category. Buyers deciding between the original construction and a radial alternative should think about whether the goal is a more traditional look, a different driving feel, or both. Wheel width and clearances deserve a fresh check before any change in construction, even when the rim diameter remains the same.

Radial equivalents for 760-15 include 215R15 as an 80-series metric radial, P225/75R15 as a 75-series P-metric radial, P235/70R15 as a 70-series P-metric radial, and 760R15 as a bias-look radial. These options keep the fitment conversation centered on a 15-inch wheel while offering different sizing conventions and profiles.

Each equivalent should be treated as an alternative to evaluate, not as an automatic swap. The recommended rim-width range tied to these equivalents is 6-8 inches, which can be an important checkpoint on a collector car. Overall dimensions, steering clearance, and fender space should also be reviewed before making the move, especially if the De Soto has replacement wheels, changed ride height, or older suspension components.

Start by confirming that the car is using the primary size that actually has a radial equivalent, which in this case is 760-15. Then verify the wheel diameter, the wheel width against the 6-8 inch recommended range for the listed equivalents, and the condition of the suspension and steering components before making the change.

A radial conversion can affect more than the tire itself because tread profile, section shape, and wheel compatibility all influence how the tire sits on the car. Clearance at the fender, inner wheelhouse, and steering stops should be checked with the vehicle loaded as it is normally driven. It also helps to compare the owner's goals honestly, since a bias-look radial suits a different appearance target than a metric or P-metric radial alternative.

The first consideration is the exact primary size and rim diameter: 700-15, 760-15, or 650-16. From there, the real choice is between the available bias-ply products within that size, or in the case of 760-15, whether a radial equivalent belongs in the discussion at all.

After size is settled, compare the tire's intended character. Some options emphasize a traditional passenger-car look with whitewall styling, while others lean toward blackwall, military, transport, or truck-oriented tread patterns. Rim-width specifications, load figures where given, and the car's restoration goals all matter. A car built for formal show presentation may call for a different tire than one that will see regular touring on the road.

Tires for the 1948 De Soto Custom & Deluxe are available in blackwall, wide whitewall, and narrow whitewall styles, depending on size. Most 760-15 choices lean toward whitewall presentation, while 700-15 and 650-16 include a broader mix of blackwall and wide whitewall options.

Sidewall style changes the car's visual character quickly, especially on a late-1940s full-size car where the tire is part of the overall stance. A wide whitewall typically supports a more restoration-oriented look, while blackwall choices can suit a plainer or more utilitarian presentation. The key is to keep appearance secondary to correct size and wheel fitment, since the right sidewall treatment still needs to be chosen within the proper tire size.

Depending on size, available brands for the 1948 De Soto Custom & Deluxe include Firestone, BFGoodrich, Goodyear, Coker Classic, Universal Vintage Tire, Garfield, Lester, Excelsior, STA, and Tornel. Not every brand appears in every size, so brand choice is tied closely to the tire size and type of product being considered.

That brand spread is most useful when it helps narrow the style of tire you want rather than treating one name as automatically right. Some choices center on classic passenger-car bias-ply presentation, while others move toward military, highway, or truck-style tread patterns. Once the correct size is confirmed, comparing sidewall style, tire series, and wheel compatibility usually does more to guide the decision than brand name alone.

A period-style 1948 De Soto Custom & Deluxe tire choice starts with retaining the correct primary bias-ply size for the specific sub-model and wheel diameter. Within those sizes, classic bias-ply offerings with blackwall or whitewall sidewalls usually provide the most historically appropriate visual starting point for a postwar De Soto restoration.

The finer decision comes down to how formal or understated the finished car should look. Wide whitewalls create a distinctly late-1940s presence, while blackwalls can give a simpler presentation. Exact originality can vary by how the car was delivered, restored, or judged, so buyers pursuing a highly exact finish should compare the tire choice with marque references, period photos, or other vehicle-specific restoration documentation before settling on a sidewall treatment.

Tire construction influences more than ride feel on a restored 1948 De Soto Custom & Deluxe; it also affects visual character. The original fitments here are bias-ply sizes, and that construction supports the tall, traditional tire presentation most owners associate with a postwar full-size American car.

A move to a radial equivalent, where available, can shift the look depending on the size format and sidewall design chosen. That is why many restorers start by deciding whether the car should read as strictly period-style or as a road-driven collector car with some compromise in construction. For 760-15 applications, a bias-look radial can bridge that gap more gracefully than a modern-format radial with a different visual profile.

Yes, modifications can affect tire fitment on a 1948 De Soto Custom & Deluxe even when the nominal tire size is correct. Wheel changes, altered wheel width, suspension work, ride-height changes, or brake conversions can all influence whether a vintage-size tire or radial equivalent has adequate space and proper wheel support.

That is especially important here because this De Soto family spans both 15-inch and 16-inch wheel fitments. A car with replacement wheels may no longer match its original size pattern, so measuring the wheel is wiser than assuming. Clearance at the front suspension, steering arc, and rear fender area should be checked before road use, particularly if a wider 15-inch size or a radial equivalent is being considered.

Before driving a 1948 De Soto Custom & Deluxe on new tires, inspect the wheels for damage or corrosion, confirm the rim diameter and width, and make sure the tires are mounted in the correct size for the car's configuration. It also helps to verify valve stems, balancing, and basic suspension and steering condition before the first meaningful road test.

After installation, check inflation, look for any sign of rubbing at full steering lock, and recheck for even seating on the rim. A collector car that has been parked for long periods can also reveal issues in wheel bearings, bushings, or alignment once it is back in motion. A short local drive followed by another visual inspection is a sensible way to catch fitment or mechanical problems early.

Tires on a collector 1948 De Soto Custom & Deluxe should be maintained with regular pressure checks, periodic visual inspections, and careful storage habits. Even if the car is driven lightly, the tires should be examined for cracking, bulges, cuts, uneven wear, and slow air loss, since age and storage conditions matter as much as mileage on an older collector vehicle.

It also helps to keep the car away from prolonged heat, direct sunlight, standing moisture, and ozone-producing equipment during storage. Moving the car occasionally can reduce the effects of long static periods, and a fresh inspection before each driving season is worthwhile. On a bias-ply-equipped car especially, staying attentive to condition and inflation can do more for safe, predictable road behavior than mileage alone would suggest.