1939 De Soto Tire Fitment Guide

1939 De Soto vehicles use two different tire sizes, and the fitment depends on the model. The 1939 De Soto 6 uses 600-16, while the 1939 De Soto 6 Air Stream uses 650-16. Both sizes are bias-ply and mount on 16-inch rims. For products with published rim-width guidance, 600-16 is used on 4.00- to 4.50-inch rims, while 650-16 is used on 4.50- to 5.00-inch rims.

That means a buyer cannot treat every 1939 De Soto the same way. Even though both sizes share the same rim diameter, the tire section width and recommended rim-width range change with the model. Start by confirming whether your car is a De Soto 6 or a De Soto 6 Air Stream, then verify the wheel you actually have on the car before settling on a replacement tire.

On a 1939 De Soto, 600-16 is a numeric bias-ply tire size. The 600 portion refers to a nominal section width in the older numeric sizing system, and the 16 identifies the wheel diameter in inches. It is not a modern metric size, and it does not use the later alphanumeric or radial coding that became common decades afterward.

For a 1939 De Soto 6, that older numeric size is part of keeping the tire visually and structurally appropriate to the period. When comparing products, the more useful next step is checking the sidewall style you want and making sure the wheel falls within the published rim-width range. That keeps the car true to its era while avoiding confusion with later tire-sizing conventions.

On a 1939 De Soto, 650-16 is also a numeric bias-ply size. The 650 portion indicates a larger nominal section width than 600-16, and the 16 means the tire mounts on a 16-inch wheel. Like other prewar numeric sizes, it reflects an earlier sizing system rather than a modern metric measurement format.

For the 1939 De Soto 6 Air Stream, 650-16 identifies the model’s larger fitment within the same 16-inch wheel diameter family. That makes the model identification especially important, because a shared rim diameter can tempt owners to assume the sizes interchange freely. Confirming the proper width range and intended visual look before choosing a tire helps keep the setup both correct and believable for a 1939 car.

1939 De Soto tires are available in both blackwall and wide whitewall styles across the sizes used by the make. The 600-16 offerings include blackwall and wide whitewall choices, and the same is true for 650-16. That gives owners flexibility to match the look of a restrained driver, a formal restored sedan, or a more presentation-focused prewar car without changing the underlying size.

Whitewall choice matters because sidewall appearance strongly affects how a 1939 De Soto reads visually. Wide whitewalls are often favored when the goal is a fuller late-1930s period look, while blackwalls can suit a simpler or more understated presentation. If the car will be judged, confirm what sidewall treatment is appropriate for the exact body style, market, and restoration standard you are aiming to follow.

1939 De Soto tires are offered by several period-oriented brands, depending on size. In 600-16, the available brands are BFGoodrich, Coker Classic, Avon, and Firestone. In 650-16, the available brands are BFGoodrich, Coker Classic, Firestone, and Garfield. All of the listed options for these fitments are bias-ply products, which keeps the construction type in line with a prewar De Soto’s original era.

Brand choice on a 1939 De Soto usually comes down to the look you want, the sidewall treatment you prefer, and any published load or setup details that matter to your car. Some owners lean toward an American-brand visual identity for a Chrysler-built prewar car, while others focus more on the exact tread and sidewall presentation. Compare within the correct size first, then narrow by appearance and wheel compatibility.

For 1939 De Soto fitments, BFGoodrich and Firestone both appear in the correct prewar numeric bias-ply sizes, but the details vary by size and sidewall treatment. In 600-16, BFGoodrich is offered as a 3.50-inch wide whitewall and Firestone as a 3.25-inch wide whitewall, with both carrying a 1400-pound load figure at 32 psi and using 4.00- to 4.50-inch rims. In 650-16, BFGoodrich appears as a 3.75-inch wide whitewall and Firestone as a blackwall, with both listing 1580 pounds at 32 psi on 4.50- to 5.00-inch rims where published.

That means the difference is not just brand name but also sidewall presentation and, in some cases, whitewall width. On a 1939 De Soto, those details have a visible effect on how formal or sporty the finished car appears. Once you have the correct size for the model, compare the exact sidewall style and any published wheel-range guidance to choose the version that best fits your restoration direction.

1939 De Soto tire rim-width requirements depend on the size. The 600-16 tires with published fitment guidance are intended for 4.00- to 4.50-inch rims, while 650-16 tires with published guidance are intended for 4.50- to 5.00-inch rims. Both sizes use 16-inch wheel diameter, but the recommended rim-width range changes because the tires themselves are different widths.

That distinction matters anytime a 1939 De Soto has had wheels swapped during decades of service or restoration. A tire may share the right 16-inch bead diameter yet still be a poor match if the wheel is too narrow or too wide for the intended size. Measuring the wheel and checking the specific product’s fitment guidance before mounting is the cleanest way to avoid setup problems.

The available 1939 De Soto fitments are prewar bias-ply tires, and these applications are commonly treated as tube-type in collector-car service unless the specific tire and wheel combination is clearly set up otherwise. The size markings shown here do not consistently carry modern tube-type or tubeless suffixes, so the practical requirement depends on the exact tire chosen and the wheel construction being used. On original-style prewar wheels, tube use is often part of the normal setup.

For a 1939 De Soto, the safest approach is to verify tube needs against the exact tire’s sidewall marking and the wheel you plan to run. Original riveted or older drop-center wheels may call for a different setup than later replacement wheels. If tubes are used, include the valve stem, flap requirement where applicable, and spare-tire setup in the same inspection so the whole system matches.

Original 1939 De Soto wheels use the same 16-inch rim diameter as both listed tire sizes, so the diameter side of compatibility is shared. That does not mean every original wheel is automatically correct for both sizes, because 600-16 and 650-16 call for different rim-width ranges where those ranges are published. Wheel condition and exact width still matter before changing from one model’s size to the other.

On a practical level, a 1939 De Soto owner should think of the shared 16-inch diameter as only the first checkpoint. The second is whether the wheel width matches the tire you intend to use, and the third is whether the car is actually the model associated with that size. Keeping those three checks in order prevents a common mistake with prewar cars that seem similar at a glance.

A 1939 De Soto should be stored in a cool, dry, dark space with the tires protected from sunlight, electric motors, welders, and other ozone-producing equipment. Because these are bias-ply applications, they are more prone to flat-spotting during long stationary periods than modern radials. Keeping the tires clean, correctly inflated, and off damp concrete helps preserve both the casing and the sidewall finish.

If the car will sit for extended periods, move the 1939 De Soto occasionally or support it in a way that reduces prolonged loading on one contact patch. Owners who value whitewall appearance should also clean sidewalls gently and avoid harsh dressings that can stain or dry the rubber. Storage habits matter as much as mileage on a collector car, especially when the car is driven only seasonally.

Tires on a 1939 De Soto should be evaluated more by age and condition than by miles traveled. A common collector-car guideline is to inspect closely once tires are around five to seven years old and to give serious replacement consideration as they approach ten years, even if tread still looks strong. The DOT date code on the tire helps establish age, and sidewall condition often tells the more important story on low-use cars.

That approach is especially important for a prewar De Soto because many hobby cars accumulate very little mileage between events. A tire can appear serviceable while the rubber has hardened, the casing has aged, or the sidewall has begun to crack. If you are uncertain whether age or storage has taken a toll, replacing old tires before a touring season is usually wiser than trying to stretch another year out of them.

Tires on a 1939 De Soto should be inspected before every drive and again before any longer outing. Look for sidewall cracking, tread separation, bulges, cuts, uneven wear, and any sign that a tire is losing pressure. On prewar cars that may use tubes or original-style wheel hardware, valve stems and the spare deserve the same attention as the four road tires.

Frequent inspection matters because a collector car can sit for weeks and then be asked to run at road speed with little warning. A quick pre-drive walkaround catches many problems early, especially on bias-ply tires that may show storage effects after inactivity. Make tire inspection part of the broader 1939 De Soto routine along with fluid checks, brake feel, and steering response before heading out.

A 1939 De Soto 6 would have been fitted in period with bias-ply tires, which was standard industry practice for American passenger cars in 1939. The size used on the De Soto 6 is 600-16, and the available replacements in that fitment remain bias-ply, which aligns well with the car’s original construction era. Original-equipment branding could vary by market and supply, so the key authenticity points are correct size, bias-ply construction, and appropriate sidewall treatment.

For restoration work, that means getting the size and visual character right matters more than chasing a brand assumption. A whitewall or blackwall choice can both be relevant depending on how the car was delivered and how it is being judged. If you are preparing a high-level car, verify body-style and market-specific expectations with a De Soto marque specialist or period factory literature before making the final call.

Correct tire fitment matters on a 1939 De Soto because judges and knowledgeable enthusiasts notice size, construction type, and sidewall appearance quickly. A prewar De Soto shown for originality should wear a size appropriate to its exact model, and a bias-ply tire is generally expected for an authentic 1939 presentation. A visibly incorrect width, a mismatched sidewall style, or a tire meant for the other model can distract from an otherwise careful restoration.

For show preparation, think of the tires as part of the car’s stance and historical credibility rather than as a separate accessory. The right sidewall treatment can complement trim and body proportions, while the wrong one can shift the whole appearance. Event rules vary, so if the car will be judged at a marque-specific or concours event, confirm those standards ahead of time instead of assuming all shows view tire details the same way.

For the 1939 De Soto 6 in 600-16, Coker Classic and Avon represent two different expressions of the same period size. The Coker Classic offering is a blackwall bias-ply tire in the Coker Classic Bias Ply series, while the Avon option appears as a blackwall 600H16 93H in the Turbospeed Mk4 series. Avon also carries an H speed rating, which corresponds to a 130 mph ceiling, while the Coker listing uses the traditional 600-16 size format without a speed letter in the size marking.

That makes the comparison less about fitment and more about how the tire is presented and specified. A restorer focused on a conventional American prewar look may prefer a traditional domestic-style bias-ply offering, while another owner may be drawn to the Avon’s distinct specification style within the same size family. Either way, the car should still be matched to the correct 600-16 application and wheel before choosing between series.

1939 De Soto tires can be suitable for highway use when they are the correct size, in sound condition, properly inflated, and matched to a mechanically healthy car. The available fitments here are bias-ply, and one 600-16 product carries an H speed rating, which corresponds to 130 mph, while the others use traditional size markings without a speed letter shown in the size code. On a prewar De Soto, the car’s brakes, steering, suspension, and general mechanical condition usually matter more than raw tire speed ceiling at normal road speeds.

The practical question is not whether a 1939 De Soto can touch highway speed, but whether the whole vehicle is ready to do it calmly and consistently. Bias-ply tires have their own feel and tracking behavior, especially on older roads and with older steering geometry. A cautious road test, proper alignment, and a full mechanical inspection are the right steps before asking a restored prewar car to handle sustained highway travel.

Inflation pressure on a 1939 De Soto should follow the vehicle manufacturer’s guidance first, then be checked against the tire’s own published load-and-pressure rating for the exact size you are using. Several 600-16 products list 1400 pounds at 32 psi, and several 650-16 products list 1580 pounds at 32 psi. Those figures describe the tire’s rated carrying capability at that pressure, not automatically the exact service pressure every 1939 De Soto should run in every condition.

Use the owner’s manual or marque literature to establish the car’s intended running pressure, then confirm you are working within the limits of the specific reproduction tire. Pressure should never be borrowed casually from another size, even when both tires fit 16-inch wheels. Once the car is in use, check cold pressures regularly and watch wear patterns to make sure the setup is behaving as expected.

Before a longer drive in a 1939 De Soto, inspect each tire for cracking, cuts, bulges, tread damage, and proper inflation. Check the spare as carefully as the road tires, and pay close attention to valve stems and tube-related hardware if the car is running a tube-type setup. A prewar touring check should also include wheel security, brake operation, steering play, fluid levels, and lighting.

Longer trips magnify small issues that may not show up on a short local outing. A tire that has aged in storage, a slow leak, or a neglected spare can turn into a roadside problem quickly once the car is loaded and driven continuously. Building a simple pre-departure checklist for your 1939 De Soto makes touring more enjoyable and reduces the odds of discovering an avoidable issue miles from home.