1940 De Soto 6 Deluxe & Custom Tires

The 1940 De Soto 6 Deluxe & Custom uses two primary tire sizes: 600-16 and 650-16. The Base model uses 600-16, while the 7 Passenger version uses 650-16. Both are bias-ply sizes for 16-inch rims, so the tire size choice depends on the exact sub-model rather than a change in construction type.

That means the first step is confirming which version of the car you have before comparing brands or sidewall treatments. A car that has changed hands over the years may also have replacement wheels, so it is worth checking the actual wheel diameter and width on the vehicle before choosing between period-style blackwall, wide whitewall, or other vintage bias-ply options.

Both primary tire sizes for the 1940 De Soto 6 Deluxe & Custom are built around a 16-inch rim. That applies whether the car uses the 600-16 tire found on the Base model or the 650-16 tire used on the 7 Passenger version. The rim diameter stays the same even though the tire width changes by sub-model.

Rim diameter is only part of the fitment picture, especially on a prewar car. Wheel width should also be checked before selecting a specific tire, since available products in these sizes can carry different rim-width specifications. Verifying the actual wheels on the car helps avoid choosing a tire that matches the nominal size but not the wheel setup or intended road use.

No. The 1940 De Soto 6 Deluxe & Custom Base uses 600-16, while the 1940 De Soto 6 Deluxe & Custom 7 Passenger uses 650-16. Both sizes are bias-ply and both use 16-inch rims, but they are not the same primary fitment across the covered sub-models.

That difference matters because tire selection should start with the exact sub-model, not just the year and make. Once the correct size is confirmed, the next comparison is usually appearance and series choice, such as blackwall versus whitewall. Owners should also confirm that the car still has the expected wheel setup, especially if it has seen restoration work or long-term storage.

Start with the correct primary size for the exact sub-model: 600-16 for the Base car and 650-16 for the 7 Passenger version. From there, compare bias-ply construction details, sidewall style, brand, tire series, and wheel compatibility. Both sizes are offered in a range of traditional-looking options, so appearance and intended use become the main deciding factors.

A restoration-focused car may call for a different visual treatment than a driver that sees regular road miles. Blackwall, wide whitewall, and other vintage-style offerings can change the car’s look significantly without changing the basic fitment. Wheel width, load capacity, and the tire’s overall character should all be checked against the vehicle’s setup before making a final choice.

The 1940 De Soto 6 Deluxe & Custom has meaningful sidewall variety, depending on size. Across the available 600-16 and 650-16 tires, choices include blackwall, wide whitewall, and double-whitewall styles. Those options give owners room to shape the car’s visual character while staying within the proper vintage bias-ply fitment range for a 16-inch wheel.

Sidewall style should be chosen as an appearance decision after the correct tire size is confirmed. A whitewall can complement a formal prewar sedan presentation, while a blackwall gives a more restrained look. Since sidewall styles are not interchangeable indicators of originality, owners pursuing a historically exact restoration should compare the tire choice with period photos or marque-specific references.

Available brands for the 1940 De Soto 6 Deluxe & Custom include BFGoodrich, Coker Classic, Firestone, Garfield, Goodyear, Lester, Excelsior, STA, Tornel, Avon, Ford Script, and Camac, depending on tire size and series. The selection spans traditional passenger-car bias-ply lines as well as some military or truck-oriented tread patterns in the same nominal size range.

Brand alone should not be the only deciding factor. It helps to compare the exact size, sidewall treatment, tire series, and rim-width specification that match the car’s intended appearance and use. Some owners will want a clean passenger-car look, while others may be replacing specialty tread designs already fitted to the vehicle, so matching the tire to the car’s setup is key.

A period-style choice starts with the correct sub-model size: 600-16 for the Base car or 650-16 for the 7 Passenger version. From there, a bias-ply tire keeps the prewar construction style and proportions that suit the 1940 De Soto 6 Deluxe & Custom. Several vintage-series options are available in both blackwall and whitewall presentations, giving room to match the car’s overall restoration direction.

The right choice depends on whether the goal is a formal touring look, a restrained driver presentation, or something closer to how the car may have appeared in period. Exact originality can vary by body style, market, and prior restoration decisions, so owners seeking a highly accurate result should compare tire appearance against marque-club guidance, period photographs, or other vehicle-specific references.

Tire construction influences both stance and visual character on a restored 1940 De Soto 6 Deluxe & Custom. Bias-ply tires carry the vintage construction style associated with the car’s era, and that affects how the sidewall, tread profile, and overall presentation look on a 16-inch wheel. Since both primary fitments for this model are bias-ply, staying with that construction preserves a distinctly prewar visual feel.

Appearance is not just about size; sidewall treatment also changes the result significantly. A blackwall can give the car a simpler, more utilitarian presentation, while whitewall and double-whitewall choices create a dressier period impression. Even when the size is correct, owners should judge the tire by how it complements the restoration’s finish, trim level, and intended use rather than assuming one style suits every car.

Yes. Even though the 1940 De Soto 6 Deluxe & Custom uses 16-inch bias-ply tires, changes to wheels, suspension height, steering components, or body clearance can alter what works on the car in practice. The Base and 7 Passenger versions already use different primary sizes, so any later modification makes it even more important to confirm the actual setup before selecting replacement tires.

A car with aftermarket wheels may need closer attention to wheel width as well as fender and steering clearance. Old repairs, replacement brake parts, or altered ride height can also affect how a vintage-size tire sits in the wheel opening. Checking the car as it stands today is the safest way to avoid choosing a size that is correct on paper but unsuitable on the vehicle.

Before road use, inspect the wheels for the correct 16-inch diameter, check that the wheel width suits the chosen tire, and confirm that each tire is mounted and inflated properly. The car should also be checked for adequate clearance at the fenders and steering components. On an older vehicle, overall mechanical condition matters just as much as the tire itself.

Brake performance, steering play, worn suspension parts, and alignment condition can all affect how a prewar De Soto behaves on fresh tires. It is also smart to look for fluid leaks, loose hardware, and any signs of rubbing during full steering travel. A careful inspection helps the new tires perform as intended and reduces surprises on the first real drive.

Collector-car tires in 600-16 and 650-16 sizes should be inspected regularly for air loss, tread wear, cracking, bulges, cuts, and other age-related deterioration. Bias-ply tires on a low-use 1940 De Soto 6 Deluxe & Custom can look acceptable while still needing closer attention because storage time, heat, and long periods of inactivity affect condition as much as mileage does.

Proper inflation, clean storage, and periodic movement of the car help reduce flat spotting and uneven stress. It also helps to keep the car away from prolonged sunlight, moisture, and ozone sources during storage. Before any longer drive, a quick check of pressure and visual condition is worthwhile, especially on a prewar vehicle that may spend more time parked than driven.