1937 De Soto Tire Fitment Guide

1937 De Soto vehicles in this range use two sizes: 600-16 and 650-16, and both apply to the 1937 De Soto 6 Air Stream. Both are bias-ply tires built for 16-inch rims, but they are not the same physical width. The 600-16 products fit 4.00- to 4.50-inch rims where that specification is listed, while 650-16 products fit 4.50- to 5.00-inch rims where that specification is listed.

That means the first thing to confirm on a 1937 De Soto is not just the year and make, but which of the two 16-inch sizes your car and wheels are set up for. A quick check of the existing tire size, wheel width, or restoration paperwork usually settles the question. Once that is confirmed, you can choose among blackwall or wide whitewall bias-ply options without crossing into the wrong width range.

On a 1937 De Soto, 600-16 is a numeric bias-ply tire size. The 6.00 figure is the nominal section width in inches, and the 16 is the wheel diameter in inches. It is an older American sizing system used widely in the prewar and early postwar years, so it does not read like a modern metric tire code.

For a De Soto owner, the practical point is that 600-16 identifies a narrower 16-inch fitment than 650-16, not just a different brand variation. If your car is built around 600-16, stay within that size family unless you have already confirmed a wheel change or a known alternate fitment. That helps preserve the car’s proportions and keeps the tire matched to the wheel width range intended for that size.

On a 1937 De Soto, 650-16 is another numeric bias-ply size. The 6.50 figure refers to nominal section width in inches, and the 16 identifies the wheel diameter in inches. Like 600-16, it belongs to the traditional bias-ply sizing language used on American cars of the period.

The important difference is width. A 650-16 tire is intended for a wider fitment than a 600-16, and the listed products in this size are matched to 4.50- to 5.00-inch rims where rim width is specified. If your 1937 De Soto is already wearing 650-16 tires or has wheels sized for that range, that is your strongest starting point when selecting replacement tires.

1937 De Soto tires are available in both blackwall and wide whitewall styles across the two sizes used on the 6 Air Stream. The 650-16 size includes blackwall and wide whitewall choices from several brands, and the 600-16 size does the same. That gives owners flexibility to match a more restrained driver presentation or a brighter prewar show-car look.

Wide whitewalls are often the visual direction buyers choose when restoring a late-1930s American car to a period-correct appearance, while blackwalls suit owners who prefer a simpler look or a less formal presentation. The right choice depends on how your particular 1937 De Soto is being finished and how closely you want the tire to support the overall restoration theme. Sidewall style changes the visual personality of the car more than many owners expect.

1937 De Soto vehicles have tire choices from BFGoodrich, Coker Classic, Firestone, Garfield, and Avon across the two sizes used on the 6 Air Stream. The 650-16 size includes BFGoodrich, Coker Classic, Firestone, and Garfield, while 600-16 includes BFGoodrich, Coker Classic, Avon, and Firestone. All of the listed options are bias-ply tires, keeping the selection in line with the construction type associated with the period.

That brand spread gives a De Soto owner room to prioritize appearance, sidewall style, or product family without changing size category. If you already know you want a wide whitewall, your choice narrows differently than if you want a blackwall tire. Once the size is settled, comparing brands within that size is the best way to refine the search instead of jumping between 600-16 and 650-16.

For a 1937 De Soto, BFGoodrich, Firestone, and Coker Classic differ mainly by sidewall presentation and some listed fitment details within the same size. In 650-16, BFGoodrich and Firestone list 4.50- to 5.00-inch rim widths, while Coker Classic is also available as a blackwall option in that size. In 600-16, BFGoodrich, Firestone, and Coker Classic all appear in the traditional bias-ply range, with BFGoodrich and Firestone offered in wide whitewall form and Coker Classic in blackwall form among the examples shown.

That means the smartest comparison point for a 1937 De Soto owner is usually the look you want and whether the product is offered in your exact size, rather than searching for dramatic construction differences. Since these are all bias-ply offerings in period-style sizes, the decision tends to center on visual authenticity and matching the tire to the wheel width range. Narrow the size first, then compare the available sidewall treatments within that size.

1937 De Soto tires in 600-16 are listed with a 4.00- to 4.50-inch rim width range on the products where rim width is specified. The 650-16 size is listed with a 4.50- to 5.00-inch rim width range on the products where that detail appears. Both sizes use 16-inch rims, but they are meant for different width windows.

That is why a 1937 De Soto owner should confirm wheel width before assuming either size can be swapped freely. A car already set up for 600-16 may not be the right candidate for 650-16 without checking the wheel itself, and the reverse is equally true. If the wheels are original, measuring bead-seat width or consulting a De Soto specialist can help settle the question before choosing a tire.

Original 1937 De Soto wheels can only be used with both 600-16 and 650-16 if they share the correct 16-inch rim diameter and also fall within the right rim width range for the size being considered. Diameter compatibility is common across both sizes because each is built for a 16-inch wheel. Width compatibility is the part that needs confirmation, since 600-16 and 650-16 do not share the same listed width range.

In practice, that means you should not treat both sizes as interchangeable simply because they both end in 16. If your existing wheels measure within the 4.00- to 4.50-inch range, that supports 600-16 where specified; if they measure within the 4.50- to 5.00-inch range, that supports 650-16 where specified. A careful wheel check prevents avoidable mounting and fitment issues later.

A stored 1937 De Soto should be kept out of direct sunlight and away from ozone sources such as electric motors, battery chargers, furnaces, and welding equipment. Tires last better in a cool, dry, clean environment, and the car should either be moved periodically or supported in a way that reduces long-term static loading. Bias-ply tires are especially prone to temporary flat-spotting after sitting, so storage habits matter on a prewar car.

For most collectors, the best routine is to keep the tires properly inflated, roll the car occasionally, and avoid letting one spot of the tread carry weight for months at a time. If the De Soto will sit through a long off-season, clean the tires first and keep them away from solvents and petroleum products. Those simple habits preserve both appearance and drivability when the car returns to the road.

On a 1937 De Soto, tire age is usually more important than mileage. Collector-car tires often age out before they wear out, so a practical rule is to begin evaluating them closely at around five to seven years and to treat about ten years as a serious replacement checkpoint regardless of tread depth. The DOT date code on the tire is the standard way to verify age on modern production tires.

That matters because a lightly driven De Soto can still be riding on rubber that looks presentable but has hardened internally or developed age-related cracking. A car that only goes to shows, club events, or weekend drives may accumulate very little mileage, yet still need replacement on calendar age alone. Regular age tracking helps you avoid relying on appearance by itself.

Tires on a 1937 De Soto should be inspected before every drive, and they deserve a more thorough check before any longer outing. Look for sidewall cracking, cuts, bulges, unusual tread wear, and any sign that a tire is losing pressure between drives. Because these are period-style bias-ply applications, changes in feel or shape after storage are also worth noticing early.

A brief walk-around catches more problems than many owners expect, especially on a collector car that may sit for stretches between uses. Before a tour or highway trip, include the spare in the inspection and make sure the valve stems are in good condition. Building that habit into your pre-drive routine is one of the simplest ways to protect both the car and the experience of driving it.

A 1937 De Soto 6 Air Stream would have been fitted in the bias-ply era, so a bias-ply tire is the historically appropriate construction type for a restoration-minded car. Within the 1937 De Soto range here, the Air Stream uses either 600-16 or 650-16 depending on the specific setup. Original-market details can vary by body style, equipment, and surviving wheel configuration, so the construction type is the broad certainty and the exact size should be confirmed against the car itself.

For a restoration, that means starting with a bias-ply tire in the correct 16-inch size rather than jumping immediately to brand choice. If the car has a known history, original wheels, or period paperwork, use those clues to settle whether it belongs in 600-16 or 650-16. Marque clubs and De Soto specialists are helpful when you want event-level confidence on a specific body or restoration standard.

Correct tire fitment matters on a shown 1937 De Soto because judges and knowledgeable enthusiasts pay attention to size, construction, and sidewall presentation. A late-1930s American car looks most authentic on bias-ply tires, and the difference between blackwall and wide whitewall can significantly change how period-correct the finished car appears. Choosing the wrong width category can also alter the visual stance in ways that stand out on an otherwise accurate restoration.

That does not mean every event uses identical judging standards, but it does mean tires should be considered part of the restoration, not an afterthought. If your De Soto is aimed at formal concours or marque judging, confirm the accepted sidewall style and size before finalizing the car. Club standards and event-specific rulebooks remain the best authority once you move beyond general period correctness.

On a 1937 De Soto, the main difference between wide whitewall and blackwall tires is visual authenticity and presentation rather than basic fitment. Both sidewall styles are available in the bias-ply sizes used on the 6 Air Stream, including 600-16 and 650-16. A wide whitewall gives the car a more formal, upscale prewar appearance, while a blackwall reads more restrained and utilitarian.

That choice should follow the way the car is being restored. A De Soto finished as a fully dressed period car often looks more convincing on a whitewall, while a simpler build or a car meant to echo a plainer day-two look may suit blackwalls better. Since the sidewall is one of the first things people notice at a glance, it is worth choosing with the overall character of the car in mind.

1937 De Soto tires can be suitable for highway use when they are the correct size, in sound condition, properly inflated, and used within the rating of the specific product selected. Most of the listed tires are traditional bias-ply designs, and at least one 600-16 option carries an H speed rating, which corresponds to 130 mph. Real-world highway safety in a 1937 De Soto is often governed as much by the car’s prewar brakes, steering, suspension, and overall condition as by the tire itself.

The practical takeaway is to match the tire to the way the car will actually be driven and to be realistic about the vehicle’s age. A healthy De Soto used for touring and secondary-road driving can perform very well on the right bias-ply tires, but long high-speed runs demand more attention to pressure, balance, alignment, and mechanical readiness. Confidence comes from the full setup, not from the tire alone.

For 1937 De Soto tires, inflation should be set with the car’s original recommendations in mind and checked against the tire maker’s maximum-rated figures for the exact tire size you choose. Among the listed products, 600-16 examples include 1400 pounds at 32 psi, and 650-16 examples include 1580 pounds at 32 psi. Those figures describe the tire’s rated load at that pressure, not automatically the day-to-day pressure every 1937 De Soto should run.

Use the owner’s manual, factory service information, or established marque guidance to determine the vehicle’s intended operating pressure, then compare that with the rating for the modern reproduction tire you are using. Do not transfer a pressure assumption from 600-16 to 650-16 or the other way around. Keeping size-specific pressures straight helps preserve ride quality, handling balance, and tire life.

Before a longer drive in a 1937 De Soto, inspect every tire for visible cracking, cuts, bulges, uneven wear, and correct cold inflation pressure. Confirm that the spare is usable and that its pressure has not been neglected. On a prewar car, the tire check should be part of a broader mechanical review that also includes brakes, steering play, wheel bearings, fluids, and basic electrical reliability.

That fuller inspection matters because a longer outing exposes weaknesses that short local drives may never reveal. If the De Soto has been sitting, take a short shakedown run before committing to distance and pay attention to pull, vibration, or a tire that refuses to hold pressure. A calm pre-trip routine is one of the best ways to make an old-car drive enjoyable instead of stressful.