1939 Pontiac Tire Fitment Guide

1939 Pontiac vehicles use two tire sizes across three models. The Pontiac 25 and Pontiac 26 use 600-16 bias-ply tires, while the Pontiac 28 uses 650-16 bias-ply tires. Both sizes mount on 16-inch wheels, but they are not the same overall fitment because their intended rim-width ranges differ: 600-16 products are listed for 4.00 to 4.50-inch rims, while 650-16 products are listed for 4.50 to 5.00-inch rims where that information appears.

That means the first step is identifying the exact 1939 Pontiac model before comparing brands or sidewall styles. A 25 or 26 owner should start with 600-16, and a 28 owner should start with 650-16. Since both sizes share a 16-inch wheel diameter, buyers sometimes assume they are interchangeable, but wheel width and model application still matter. Checking the actual wheel before choosing a tire is the safest way to avoid a mismatch.

A 600-16 tire on a 1939 Pontiac is a numeric bias-ply size. The leading number, 600, indicates a nominal section width of roughly 6.00 inches in period sizing language, and the 16 refers to the wheel diameter in inches. On 1939 Pontiac applications, 600-16 belongs to the Pontiac 25 and Pontiac 26, not the Pontiac 28.

Modern buyers are often more familiar with metric radial sizing, so prewar numeric sizes can look unusual at first. For a 1939 Pontiac, the key point is that 600-16 is an era-correct bias-ply fitment language, not a modern width-and-aspect-ratio code. Once the model is confirmed, the next choice becomes sidewall style and brand, with blackwall and wide whitewall versions both available in this size.

No, not all 1939 Pontiac models use the same tire size. The Pontiac 25 and Pontiac 26 share 600-16, while the Pontiac 28 uses 650-16. All three models stay within a 16-inch wheel diameter, but the larger size is reserved for the 28 rather than being spread across the full year's lineup.

That model split matters because it affects more than appearance. The two sizes are intended for different wheel-width ranges and support different load capacities in the available products. If a buyer only knows they own a 1939 Pontiac but has not identified whether it is a 25, 26, or 28, it is worth confirming the model designation first. That single step narrows the fitment immediately and prevents choosing a size from the wrong branch of the lineup.

1939 Pontiac tires are available in both blackwall and wide whitewall styles, depending on size and brand. In 600-16, blackwall options appear from Coker Classic and Avon, while wide whitewalls appear from BFGoodrich and Firestone. In 650-16, blackwall options appear from Coker Classic and Firestone, and wide whitewalls appear from BFGoodrich and Garfield.

That variety gives owners room to match the car's intended character. A blackwall usually suits a more restrained prewar presentation, while a wide whitewall creates the fuller period visual many restorers want on late-1930s American cars. The right choice is less about fitment than about finish and authenticity goals. If the car is being prepared for judged events, it is smart to compare the sidewall style against period photos and the standards of the club or show that matters to you.

Several brands offer tires for 1939 Pontiac fitments. The 600-16 size is available from BFGoodrich, Coker Classic, Avon, and Firestone, while the 650-16 size is available from BFGoodrich, Coker Classic, Firestone, and Garfield. All of the listed options are bias-ply, which suits the prewar character of the 1939 Pontiac range.

Brand choice usually comes down to how you want the tire to look and how closely you want to match a traditional American-car presentation. Some buyers focus on familiar domestic heritage names and whitewall styling, while others want a blackwall or a specific brand character within the same size. Once the correct size is established for your model, comparing the available brands by sidewall style, load figure, and wheel-width compatibility is the most useful next step.

In 600-16 for a 1939 Pontiac, both BFGoodrich and Firestone offer bias-ply wide whitewall tires with a listed maximum load capacity of 1,400 pounds at 32 psi and a 16-inch rim diameter. Each is shown for 4.00 to 4.50-inch rim widths. The visible difference in the available examples is whitewall width, with BFGoodrich at 3.50 inches and Firestone at 3.25 inches, and the listed weights also differ slightly.

That makes the choice more about appearance and presentation than basic fitment. A buyer trying to refine the look of a 1939 Pontiac restoration may prefer one whitewall proportion over the other, especially on a car where stance and trim balance matter. Since the load and wheel-width guidance overlap, either can serve the same application if the 600-16 size is correct for the model. Choosing between them comes down to sidewall styling preference and brand loyalty rather than a different sizing system.

Rim-width guidance for 1939 Pontiac tires depends on the size. The 600-16 tires used on Pontiac 25 and Pontiac 26 models are listed for 4.00 to 4.50-inch rim widths on the products where rim width is stated. The 650-16 tires used on the Pontiac 28 are listed for 4.50 to 5.00-inch rim widths where that specification appears.

That difference is one reason the two sizes should not be treated as casual substitutes just because both fit 16-inch wheels. Wheel diameter alone does not tell the whole story. Measuring the actual wheel is worthwhile on an older car, especially if wheels may have been changed during an earlier restoration. Matching the tire to the proper width range helps preserve the intended profile and avoids forcing a tire onto a wheel outside its listed application.

Original 1939 Pontiac wheels can only be shared across both tire sizes if the wheel has the correct 16-inch diameter and also falls within the proper rim-width range for the tire being considered. The 600-16 size is shown on 4.00 to 4.50-inch rims, while 650-16 is shown on 4.50 to 5.00-inch rims where width information is provided. That overlap at 4.50 inches does not make every wheel universally suitable.

In practical terms, a 16-inch wheel from one 1939 Pontiac model should not automatically be assumed right for another model's tire size. The safest approach is to inspect the actual wheel and verify the width before fitting a different size. On restored cars, wheels may have been swapped over the decades, so the current hardware may not match the original model designation. Confirming diameter and width together avoids fitment guesswork.

A stored 1939 Pontiac should be kept in a cool, dry, dark environment away from direct sunlight, electric motors, battery chargers, furnaces, and other ozone-producing equipment that can age rubber. Bias-ply tires, like the 600-16 and 650-16 sizes used on 1939 Pontiac models, are especially prone to flat-spotting if the car sits in one position for long periods. Clean floors, stable temperatures, and correct inflation all help reduce stress on the casing.

Owners who keep a 1939 Pontiac parked for months at a time should either move the car periodically or support it in a way that reduces continuous load on one contact patch. That is particularly useful on collector cars driven seasonally. A breathable cover and avoidance of damp storage conditions also help preserve both sidewalls and wheels. Proper storage does not stop aging, but it slows the cosmetic and structural deterioration that often appears first on lightly used antique-size tires.

Tires on a 1939 Pontiac should be judged primarily by age and condition rather than by mileage. Collector cars often accumulate very few miles, so the common benchmark is to begin evaluating tires closely once they reach roughly five to seven years of age and to treat around ten years as a serious replacement consideration regardless of tread depth. The date code on the tire is the best starting point for establishing age.

That approach matters on a 1939 Pontiac because a handsome-looking bias-ply tire can still be old enough to deserve caution. Sidewall weathering, hardening rubber, and long-term storage effects can all show up before the tread is worn out. A car that only attends shows or takes occasional short drives still ages its tires over time. Regular age-based review is more realistic for antique and classic vehicles than waiting for tread wear alone to guide replacement.

Tires on a 1939 Pontiac should be inspected before every drive and again before any longer outing. Look for sidewall cracking, cuts, bulges, uneven wear, and any sign that the tire has been run low or has shifted on the wheel. Pressure retention matters as much as visible condition on a low-use collector car because a slow loss of air can go unnoticed between drives.

A more thorough inspection at regular intervals is worthwhile even if the car is only driven locally. On a prewar Pontiac, pay attention to the spare as well, since roadside support for antique sizes is not as simple as for a modern daily driver. If the car uses tube-type service in practice, valve stems and tube-related air loss deserve close attention too. Catching a problem in the garage is far easier than discovering it after the car is already on the road.

A 1939 Pontiac 25 would have been fitted in period with bias-ply tires, which was standard American passenger-car practice in the prewar era. Within the available 1939 Pontiac fitments here, the Pontiac 25 uses the 600-16 size. That makes a 600-16 bias-ply tire the correct starting point for an owner trying to stay true to the car's original type of fitment.

What can still vary is the exact sidewall presentation and market-specific detail. Wide whitewall and blackwall versions both exist today in 600-16, but the correct visual treatment for a specific restoration can depend on how the car was ordered, sold, and later judged. A marque club, factory literature, or period photography is the best way to narrow those finer points. The important baseline is that a 1939 Pontiac 25 belongs in a 600-16 bias-ply fitment, not a later radial format.

Correct tire fitment matters quite a bit when a 1939 Pontiac is being prepared for judged display. Size, construction type, and sidewall style all influence whether the car presents as era-appropriate. A Pontiac 25 or 26 wearing 650-16 tires, or a Pontiac 28 wearing 600-16 tires, would immediately move away from proper model-specific fitment, and an obviously modern sidewall presentation can also stand out on a prewar car.

The level of scrutiny depends on the event. Local shows may reward overall appearance, while marque judging often looks more carefully at size, proportions, and whether the tire matches the car's period character. For a 1939 Pontiac, staying with bias-ply construction and choosing the right size for the correct model is the first layer of authenticity. If the car is being judged seriously, compare your planned sidewall style with period images and the standards used by the relevant club.

For the 1939 Pontiac 28, both BFGoodrich and Garfield offer 650-16 bias-ply wide whitewall tires with a listed maximum load capacity of 1,580 pounds at 32 psi, a 16-inch rim diameter, and a 4.50 to 5.00-inch rim-width range. The visible distinction in the examples shown is the whitewall width and branding approach: BFGoodrich is listed with a 3.75-inch whitewall, while Garfield is listed as a wide whitewall with a Zig Zag tread presentation.

That means the restoration choice can come down to how closely the tire's sidewall and tread character align with the look you want for the car. Since both sit in the same size, construction type, and general load class, the practical fitment baseline remains the same. Owners pursuing a period-themed show presentation often choose between such products by visual style rather than by a major difference in application. The key is keeping the Pontiac 28 in the correct 650-16 bias-ply category.

1939 Pontiac tires can be suitable for highway driving when they are the correct size, in good condition, properly inflated, and used within the limits of their construction and any stated speed rating. The available 600-16 and 650-16 products are bias-ply, and one 600-size option is marked with an H speed rating, which corresponds to 130 mph. Even so, tire capability is only one part of the picture on a prewar automobile.

A 1939 Pontiac's brakes, suspension design, steering feel, and general mechanical condition usually matter more to real-world highway confidence than a theoretical top-speed figure on the sidewall. Bias-ply tires also drive with a different feel than modern radials, especially in grooves, crosswinds, and emergency maneuvers. For that reason, safe road use begins with realistic speeds, careful inspection, and making sure the whole car is ready for the trip rather than focusing on the tire in isolation.

Inflation pressure for a 1939 Pontiac should be tied to the exact tire size and product, then checked against the vehicle's factory guidance. Several 600-16 products list a maximum load capacity of 1,400 pounds at 32 psi, while several 650-16 products list 1,580 pounds at 32 psi. Those figures show the tire's rated load-and-pressure relationship, but they are not the same thing as a universal operating recommendation for every 1939 Pontiac application.

The best practice is to start with the original owner's manual or period service information for the car, then compare that guidance with the current tire manufacturer's specifications for the reproduction tire you are using. Pressure should never be transferred casually from one size to another just because both fit 16-inch wheels. On a collector car, pressure also deserves regular rechecking because long intervals between drives can hide slow air loss that changes how the car rides and handles.

Before a longer drive, a 1939 Pontiac should have all five tires inspected for cracking, cuts, bulges, unusual wear, and correct inflation. Check that the valve stems are sound, the spare is usable, and the tread is free of embedded debris. Since 1939 Pontiac fitments are model-specific, it is also wise to confirm that the car is actually wearing the correct size for its model before setting off on a substantial trip.

Tires are only one part of the pre-drive routine on a prewar car, but they are one of the easiest places to catch a problem early. A car that has been sitting can look ready and still have underinflated tires or age-related sidewall issues. After the tire check, move on to the normal old-car basics such as wheel fasteners, brake feel, fluid levels, and steering response. A few minutes in the garage can prevent a roadside interruption that is much harder to solve with antique-size tires.