1939 Nash Tire Fitment Guide

1939 Nash vehicles in this guide use two sizes: 6.25-16 and 700-16, and both are tied to the 1939 Nash Ambassador. Both are bias-ply sizes and both mount on 16-inch wheels. Rim-width guidance is published within the available products for 700-16 at 4.50 to 5.50 inches on some offerings, which is a useful benchmark when checking wheel compatibility on an Ambassador.

That means the first thing to verify is not year alone, but which of the two 16-inch sizes belongs on your particular 1939 Nash Ambassador. If your car is being restored, compare the tire size already on the vehicle, any surviving factory literature, and the wheel itself before making a final choice. Once the size is settled, sidewall style becomes the next decision.

On a 1939 Nash, 6.25-16 is a numeric bias-ply size. The 6.25 refers to the nominal section width in inches, while 16 is the rim diameter in inches. It is an older sizing convention used widely on prewar and early postwar American cars, and it describes a bias-ply tire rather than a modern metric radial.

A buyer looking at 6.25-16 for a 1939 Nash should think of it as a period-correct size format first, not as a direct equivalent to a modern passenger-car code. The main practical check is whether your Ambassador was set up for that size and whether your wheel diameter is 16 inches. After that, the remaining choice is usually appearance and restoration intent.

On a 1939 Nash, 700-16 is also a numeric bias-ply size. The 7.00 identifies the nominal section width in inches and the 16 identifies the wheel diameter in inches. One available 700-16 product carries a commercial-style size marking, 700-16C 102/100L, but it remains a 16-inch bias-ply fitment in the same basic numeric family.

A 1939 Nash owner should read 700-16 as a larger numeric-section bias-ply size than 6.25-16, while keeping in mind that both belong to the same prewar sizing system. Because several 700-16 products exist with different sidewall styles and load markings, it is a size where details matter. Confirm the wheel, the intended look of the car, and the exact product markings before making your final pick.

The right choice for a 1939 Nash depends on which size your Ambassador actually uses, because both 6.25-16 and 700-16 are bias-ply sizes and both are period-appropriate in construction. This is not a bias-ply versus radial decision. It is a question of matching the correct numeric size to the car's wheel and established fitment.

If your priority is restoration accuracy, start with the size associated with your car's existing wheel and any surviving reference material for that specific Ambassador. If your priority is product variety, 700-16 currently offers more choices in sidewall appearance and brand selection. Either way, treat size confirmation as the first step and styling preference as the second.

Available 1939 Nash tires in 700-16 include both Blackwall and Wide Whitewall styles. Lester and Firestone offerings in this size include Wide Whitewall versions, while Avon and BFGoodrich offerings include Blackwall versions. That gives Ambassador owners the ability to tune the finished look of the car while staying within a period-appropriate bias-ply format.

For a prewar American car like a 1939 Nash Ambassador, sidewall appearance can have a major effect on how formal or understated the car looks once it is on its wheels. A whitewall usually leans more toward a dressed, show-oriented presentation, while a blackwall often creates a more restrained service look. Match the sidewall style to the era-correct appearance you want for the finished car.

Current 1939 Nash coverage in the listed products includes Lester, Avon, BFGoodrich, and Firestone, all in 700-16 bias-ply form. Those brands give Ambassador owners a mix of traditional collector-tire names and long-established historic American tire branding. Sidewall presentation differs by brand in the available selection, with both Blackwall and Wide Whitewall choices represented.

Brand choice on a 1939 Nash usually comes down to the look you want on the car and the exact specification details of the product rather than a simple one-brand answer for every owner. Some buyers want a whitewall to complete a restoration, while others prefer a blackwall utility look. Once the size is confirmed, compare the brand's sidewall style and any published load information to narrow the field.

Published rim-width guidance appears on some 700-16 tires for 1939 Nash, where BFGoodrich and Firestone products specify a 4.50 to 5.50 inch rim-width range on a 16-inch wheel. That gives a clear approved-width window for those specific 700-16 offerings. The key fitting point is that wheel diameter and wheel width both need to be checked before final tire selection.

A 1939 Nash owner should not assume that every 16-inch wheel automatically suits every 16-inch tire. Measure the wheel or verify it against known specifications for the car, especially if the car has been apart for restoration or may have had wheels swapped over the decades. Staying within the listed rim-width range helps preserve the intended shape and fit of the tire on the wheel.

The available 700-16 products for 1939 Nash are presented without TT or TL markings in the listed size descriptions, so the practical approach is to confirm the exact product's sidewall marking and match it to the wheel being used. On a prewar car such as a 1939 Nash Ambassador, tube fitment often depends on both the tire type and the design and condition of the wheel itself.

That matters because an original-style wheel may call for a different setup than a later replacement wheel, even when the tire size is the same. Before mounting, inspect the wheel carefully, verify whether the tire is marked for tube-type or tubeless service, and use the correct valve hardware for the assembly. A tire shop familiar with vintage wheels can help prevent avoidable installation problems.

Both 6.25-16 and 700-16 for 1939 Nash share the same 16-inch rim diameter, so original 16-inch Ambassador wheels may be diameter-compatible with either size. That said, diameter alone is not the whole answer. Wheel width still has to agree with the tire's approved range, and published width guidance is available on some 700-16 products at 4.50 to 5.50 inches.

For an owner preserving original wheels, that means checking the wheel's actual measurements before assuming both sizes are interchangeable on every car. A wheel that physically accepts the tire is not automatically the ideal match for shape, clearance, or restoration accuracy. Use the wheel diameter as the first screen, then verify width and compare the intended look of the finished car before mounting.

A stored 1939 Nash should be kept out of direct sunlight, away from electric motors and ozone-producing equipment, and off damp surfaces whenever possible. Bias-ply tires can flat-spot more readily during long stationary periods than radials, so occasional rolling of the car or the use of stands during extended storage can help reduce shape distortion. Clean, dry conditions are always better than a hot or humid garage corner.

Prewar cars are often parked for long stretches, and tires tend to age quietly when they are not being driven. Keep inflation pressures checked during storage, avoid petroleum-based dressings, and inspect the sidewalls every few weeks if the car is not moving. A little storage discipline goes a long way toward preserving both the appearance and service life of tires on a 1939 Nash.

Tires on a 1939 Nash should be judged by age, condition, and storage history more than by mileage. A sound collector-car practice is to evaluate them closely once they are around five to seven years old and to treat roughly ten years as a point where replacement deserves serious consideration, even if tread remains. The DOT date code on the tire is the starting point for that timeline.

Many vintage cars are driven too little to wear out the tread before the rubber itself becomes the issue. A tire can look presentable on a lightly used 1939 Nash and still be past its best service years. If the car sees touring use, highway travel, or carries passengers regularly, age becomes even more important in the decision than the amount of visible tread left.

Tires on a 1939 Nash should be inspected before every drive and again before any longer outing. Look for sidewall cracking, embedded objects, tread separation signs, bulges, air loss, and uneven wear. On a collector car that may sit for weeks at a time, even a short visual and pressure check can catch problems that develop between drives.

A prewar car asks for a little more routine attention because the tire is only one part of an older mechanical system. If your 1939 Nash uses tube-type assemblies, include valve stems and any signs of tube-related leakage in the inspection routine as well. Pair the tire check with a quick review of brakes, steering feel, and wheel fasteners before heading out.

A 1939 Nash Ambassador would have been built in the bias-ply era, so bias-ply construction is the correct starting point for authentic fitment. The sizes associated with the 1939 Nash Ambassador here are 6.25-16 and 700-16, both on 16-inch wheels. No original equipment brand should be assumed unless you have factory literature or surviving car-specific evidence to support it.

That makes construction type and size the first authenticity checkpoints when planning a restoration. If your goal is a faithful car, verify whether your Ambassador should wear 6.25-16 or 700-16, then choose the sidewall style that best suits the presentation you want. For market-specific or body-style-specific judging details, a Nash club or marque specialist remains the best final authority.

Correct tire fitment matters on a 1939 Nash because show judging often considers whether the size, construction, and sidewall appearance suit the era and the vehicle's intended presentation. A prewar Nash shown for authenticity is generally expected to wear bias-ply tires, and an obviously modern replacement style can stand out quickly. Sidewall treatment also affects the visual impression of the finished restoration.

For a serious show car, treat the tire as part of the restoration, not as an afterthought once the paint and trim are done. The wrong size can upset the stance, and the wrong sidewall style can alter the period look even if the tire physically fits. Check event standards early, especially if the car is being prepared for marque judging rather than general local display.

For the 1939 Nash in 700-16, both Lester Wide Whitewall and Firestone 4.00 Inch Whitewall are bias-ply whitewall choices on 16-inch rims, but they differ in listed details. The Lester tire is shown at 28 pounds, while the Firestone is shown at 29 pounds and includes a published max load of 1800 at 36 psi plus a listed rim-width range of 4.50 to 5.50 inches. Both deliver a whitewall presentation suited to a prewar car.

A buyer comparing those two for a 1939 Nash should focus on the exact whitewall look desired, the published specification details, and whether the wheel falls within the Firestone's stated rim-width range. Either can support a restoration-oriented appearance, but one may align better with your wheel setup or your preferred visual style. Use those tangible differences to guide the choice rather than relying on brand name alone.

1939 Nash tires can be suitable for highway use when they are new, correctly fitted, properly inflated, and used within their intended limits. One available 700-16 product carries an L speed rating, which corresponds to 75 mph, while the other listed 700-16 products do not show a speed letter in the available description. On a prewar Nash Ambassador, the car's own braking, steering, and suspension condition often matter as much as the tire itself during real-world driving.

That means highway use should be approached with the whole car in mind rather than by reading only the tire size. A sound, freshly inspected tire is only part of the equation on a 1939 Nash. If the car will be used beyond local cruising, confirm the exact speed marking on the tire you choose and make sure the vehicle is mechanically prepared for sustained road speeds.

Inflation pressure for 1939 Nash tires should follow the factory guidance for the car and the limits shown for the specific tire you select. Within the listed 700-16 products, BFGoodrich shows a max load of 1900 at 36 psi and Firestone shows 1800 at 36 psi. Those figures are tire ratings, not a blanket recommendation to run every 1939 Nash tire at the same pressure in service.

The practical approach is to start with the original Nash owner's guidance if available, then confirm that your chosen tire's rated pressure and load capacity support that use. Do not transfer a pressure figure from one size or product to another just because both are 16-inch bias-ply tires. The correct inflation point balances the car's weight, ride quality, and the tire maker's specification.

Before a longer drive in a 1939 Nash, inspect each tire for cracking, cuts, bulges, irregular wear, and signs of air loss, then verify pressures when the tires are cold. Check the spare as well, because a long-stored spare on a collector car is often overlooked until it is needed. If the car uses tube-type assemblies, include valve stems and any evidence of leakage in the pre-drive inspection.

A tire check should sit alongside a broader pre-trip review of the car's fluids, brakes, steering, cooling system, and wheel hardware. Older cars ask for a more complete once-over because one weak link can shorten the trip quickly. Spending a few extra minutes in the garage is especially worthwhile on a 1939 Nash, where age-related issues tend to appear from time and storage as much as from mileage.