1939 Hupmobile Tire Fitment Guide

Three sizes fit 1939 Hupmobile vehicles, and each one is tied to a specific model. The E922 uses 6.25-16, the H925 uses 650-16, and the R915 uses 600-16. All three sizes mount on 16-inch wheels, but the available rim-width ranges shown in current product offerings differ by size, with 650-16 commonly paired with 4.50 to 5.00 inch rims and 600-16 commonly paired with 4.00 to 4.50 inch rims.

That model-by-model split means year and make alone are not enough when choosing tires for a 1939 Hupmobile. Start by confirming the model designation on the car, then match the tire size to the wheel diameter and actual wheel width before choosing a blackwall or wide whitewall version. That approach avoids mixing sizes that may share a 16-inch rim diameter but were not intended for the same model.

A 600-16 marking is an older numeric bias-ply tire size. In that system, the first number refers to the nominal section width, so 600 means roughly 6.00 inches wide, while 16 is the wheel diameter in inches. On a 1939 Hupmobile, that size applies to the R915, and current offerings in that size remain bias-ply rather than modern metric radial replacements within this fitment group.

Understanding that code helps separate true vintage sizing from newer metric markings that look very different. If you own a 1939 Hupmobile R915, 600-16 is the fitment to search first, then you can compare blackwall against wide whitewall styling and look at product-level details such as rim-width range, load rating, and any specialty speed rating marking on a particular tire.

No, 1939 Hupmobile models do not all use the same tire size. The E922 uses 6.25-16, the H925 uses 650-16, and the R915 uses 600-16. Even though all three are 16-inch bias-ply applications, the section widths differ and the available products are not identical from one size to the next.

That matters because a buyer can easily assume a single late-1930s Hupmobile size applies across the board when it does not. If the car's model identification is unclear, check the body tag, serial information, old service records, or the tire size already mounted on the wheels before moving forward. Once the model is confirmed, the correct tire choice becomes much more straightforward.

Current 1939 Hupmobile tire offerings include both blackwall and wide whitewall styles in the sizes that have product listings here. The 650-16 size for the H925 is available in blackwall and wide whitewall versions, and the 600-16 size for the R915 is also available in both blackwall and wide whitewall versions. All of those listed choices remain bias-ply, which suits the prewar character of the car.

The practical choice comes down to how the car is being presented. Blackwalls give a plainer, more restrained look, while wide whitewalls create a dressier prewar appearance that many owners prefer on restored cars. If authenticity for a specific market, trim level, or show class matters, compare your car with period photos or consult a Hupmobile specialist before settling on one sidewall treatment.

Several brands offer tires for 1939 Hupmobile applications listed here. The 650-16 size appears from BFGoodrich, Coker Classic, Firestone, and Garfield, while the 600-16 size appears from BFGoodrich, Coker Classic, Avon, and Firestone. All are bias-ply offerings in the sizes shown, but the sidewall presentation and some product-level specifications differ from one brand to another.

Brand choice is usually less about changing the basic fitment and more about selecting the look and product character you want on the car. Some owners prioritize a traditional American-brand appearance, while others are drawn to a particular tread style or a specialty marking. Once your model and size are confirmed, comparing brands within that exact size is the cleanest way to narrow the field.

For the listed 1939 Hupmobile sizes, BFGoodrich and Firestone both offer bias-ply options, but the available sidewall presentations and published details can differ slightly by size. In 650-16, both brands show products with a 1580-pound load rating at 32 psi and 4.50 to 5.00 inch rim-width compatibility, while BFGoodrich is listed with a 3.75 inch whitewall and Firestone appears in blackwall form. In 600-16, BFGoodrich shows a 3.50 inch whitewall and Firestone shows a 3.25 inch whitewall, both with 1400-pound load ratings at 32 psi and 4.00 to 4.50 inch rim-width compatibility.

That means the choice between the two often comes down to visual preference and the specific tire's presentation rather than a major change in basic fitment. Whitewall width can noticeably affect the way a prewar Hupmobile sits visually, especially on a formal restoration. Compare the exact sidewall treatment you want against your car's intended appearance instead of assuming every brand version looks the same.

Current 1939 Hupmobile product offerings show size-specific rim-width ranges rather than one universal specification for every model. The 650-16 size used on the H925 is commonly listed for 4.50 to 5.00 inch rims, while the 600-16 size used on the R915 is commonly listed for 4.00 to 4.50 inch rims. All listed sizes mount on 16-inch wheels, but section width and approved wheel width still need to match the tire.

That makes wheel measurement worth doing before mounting a new set, especially on a car that may have had wheels swapped over the years. Measure the wheel, confirm the bead-seat width, and make sure the tire you choose falls within the stated range for that size. A matching 16-inch diameter alone does not guarantee the wheel is the right width for every 1939 Hupmobile tire size.

Original 1939 Hupmobile wheels can only be used with all three listed tire sizes if the wheel diameter is 16 inches and the wheel width suits the specific tire being mounted. Every size in this year-make group uses a 16-inch rim, but the available wheel-width ranges shown for 600-16 and 650-16 are not identical. That means diameter compatibility is shared, while width compatibility still depends on the exact wheel and model.

Owners sometimes assume that because the year-make family stayed on a 16-inch wheel, any listed size can move from one model to another. The safer approach is to treat each model's tire size as its own application and verify the wheel itself before mounting. If the car has replacement or later-service wheels, that check becomes even more important.

A 1939 Hupmobile should be stored in a cool, dry, dark space away from direct sunlight, electric motors, furnaces, welders, and other ozone-producing equipment that can age rubber. Keep the tires clean, properly inflated, and off oil- or solvent-contaminated surfaces. Because these applications are bias-ply, long static storage can encourage flat-spotting more readily than many later radial designs.

If the car will sit for an extended period, move it periodically so the tires are not carrying the load in one spot for months at a time. Some owners also use stands to reduce static load during seasonal storage, though the suspension should still be supported appropriately. Good storage habits preserve both the tire's appearance and the way the car feels when it goes back on the road.

Tires on a 1939 Hupmobile should be judged more by age and condition than by mileage, because many collector cars are driven infrequently. A sensible rule is to begin evaluating them carefully once they are about five to seven years old and to consider replacement as they approach roughly ten years, even if tread depth still looks good. The DOT date code on the tire helps establish actual age.

That timeline matters because a prewar car can spend long periods indoors and still age its tires through time, heat cycles, and storage conditions. Sidewall cracking, hardening, vibration, and reduced pressure retention are all more meaningful warning signs than simple tread wear on a low-use collector car. Age-based planning is usually the smarter way to manage tire service life on a 1939 Hupmobile.

Tires on a 1939 Hupmobile should be inspected before every drive, with a more thorough check before any longer outing. Look for sidewall cracking, cuts, bulges, embedded debris, uneven wear, and any loss of air pressure. On a collector car, it is also wise to check the spare, because it may be decades old in appearance even if it has barely been used.

A brief inspection routine helps catch problems early on a car that may not see daily use. If the tire uses a tube-type setup, pay attention to valve-stem condition as well, since stems and tubes age along with the tire itself. That few minutes in the garage can prevent the kind of roadside failure that quickly turns a pleasant vintage drive into a recovery exercise.

A 1939 Hupmobile E922 belongs to a prewar American era when bias-ply construction was the normal original fitment type, and the listed size for the E922 is 6.25-16. That places the car squarely in the traditional numeric bias-ply sizing system used before later alphanumeric and metric conventions became common. Original-equipment branding could vary by market and delivery history, so the key authenticity point is the correct size, construction type, and era-appropriate appearance.

For restoration work, start with 6.25-16 bias-ply as the baseline and then refine the sidewall look to match the car's intended finish. If the car is being prepared for marque judging or a highly specific historical presentation, period photos, factory literature, and Hupmobile club knowledge are the best next steps. Those sources help settle details that go beyond the basic fitment itself.

Correct tire fitment matters a great deal when showing a 1939 Hupmobile, especially in judged classes that value authenticity. Judges and knowledgeable enthusiasts will notice whether the size matches the model, whether the construction reflects the period, and whether the sidewall style looks appropriate for a late-1930s American car. Using a size intended for a different 1939 Hupmobile model can stand out even if the tire still mounts on a 16-inch wheel.

That does not mean every event applies the same standard, but tire size, visual profile, and sidewall treatment all influence the car's overall credibility. Owners pursuing formal judging should verify the exact model first, then match the tire's appearance to the restoration goal rather than choosing solely by convenience. Marque clubs and event rulebooks are the best guides when originality standards become very specific.

For a 1939 Hupmobile, blackwall and wide whitewall tires use the same underlying size when compared within a model-specific application, but they create very different visual results. The listed 650-16 and 600-16 offerings include both blackwall and wide whitewall versions, with examples such as 3.75 inch and 3.50 inch whitewalls depending on brand and size. Both remain bias-ply tires suited to a prewar presentation, but the sidewall treatment changes the car's formality and period character.

Blackwalls usually suit a more restrained, utilitarian look, while wide whitewalls give the car a richer and more dressed appearance that many restorers associate with upscale prewar style. The right choice depends on how the specific Hupmobile is being restored and how closely you want to mirror period imagery. If show accuracy matters, compare whitewall width and overall look against reliable references before committing.

1939 Hupmobile tires can be safe for highway driving when they are in good condition, correctly sized for the model, properly inflated, and used within their construction and speed-rating limits. The listed applications are bias-ply, and within the 600-16 group there is also an Avon product marked with an H speed rating, which corresponds to 130 mph. In normal vintage use, the tire's published limit is rarely the only concern, because a 1939 car's brakes, suspension, steering, and overall mechanical condition matter just as much.

That means highway suitability is really a whole-car question, not just a tire question. Fresh, properly fitted tires are essential, but they should be paired with sound wheel condition, correct alignment, and a realistic understanding of how a prewar automobile behaves at speed. A conservative pace and a complete pre-drive inspection are usually more important than chasing the highest theoretical rating on paper.

Inflation pressure for 1939 Hupmobile tires should follow the vehicle manufacturer's guidance for the car and the tire maker's rating for the exact product. Several listed 650-16 products show a maximum load of 1580 pounds at 32 psi, and several 600-16 products show a maximum load of 1400 pounds at 32 psi, while the Avon 600H16 lists a 1,433-pound load figure. Those numbers describe the tire's rated capacity at that pressure, not a universal one-pressure-fits-all rule for every Hupmobile model.

Use the owner's manual or period service information as the starting point for the vehicle, then make sure the chosen tire's specifications support that use. Do not transfer a pressure figure from one size to another just because both fit 16-inch wheels. Small differences in section width, product design, and the way the car carries its weight can all affect the correct final setting.

Before a longer drive in a 1939 Hupmobile, inspect each tire for cracking, cuts, bulges, uneven tread wear, and proper air pressure, and make sure the spare is roadworthy as well. Check that valve stems are sound, especially on older tube-type style installations, and confirm the wheels are free from obvious damage or looseness. A prewar car should also have its broader mechanical condition reviewed before distance driving.

Tires are only one part of the preparation, but they are the part that directly carries the car and transmits every steering and braking input. Once the tires are checked, it is wise to look over the brakes, cooling system, wheel bearings, and basic fluid levels so the car is ready as a whole. A careful once-over at home is far easier than troubleshooting a vintage car on the shoulder.