1938 Hupmobile Tire Fitment Guide

1938 Hupmobile vehicles use two different tire sizes depending on model. The 1938 Hupmobile 8 uses 650-16, while the 1938 Hupmobile E uses 6.25-16. Both sizes mount on 16-inch wheels, and 650-16 products are built for rim widths in the 4.50- to 5.00-inch range where that specification is published.

That means year and make alone are not enough to choose the right tire for a 1938 Hupmobile. Start by identifying whether your car is an 8 or an E, then compare the actual wheel and the tire size already associated with the car. Since both fitments are bias-ply and share the same wheel diameter, the main risk is selecting the wrong model-specific size rather than choosing the wrong construction type.

On a 1938 Hupmobile, 650-16 is a numeric bias-ply tire size. The 6.50 figure refers to the nominal section width in inches, and the 16 refers to the wheel diameter in inches. This size belongs to the 1938 Hupmobile 8 rather than the full Hupmobile lineup for the year.

Modern buyers are used to metric radial markings, so older numeric sizing can look unfamiliar even though it is straightforward once decoded. For a Hupmobile 8, the important point is that 650-16 is an era-correct prewar bias-ply format with appearance choices such as blackwall or wide whitewall depending on the product. If your car is a Hupmobile E, this is not the size to assume just because the wheel diameter is also 16 inches.

No, 1938 Hupmobile models do not all use the same tire size. The Hupmobile 8 uses 650-16, and the Hupmobile E uses 6.25-16. Both are 16-inch bias-ply fitments, but they are tied to different models.

That distinction matters because prewar cars can look similar at a glance, especially after decades of wheel changes, restoration work, or mixed parts. If you are unsure which Hupmobile you have, check the model identification first and then inspect the wheel and any existing tire markings before making a final selection. Treat shared wheel diameter as only one piece of the fitment puzzle, not proof that the tire sizes interchange.

1938 Hupmobile tires are available in blackwall and wide whitewall styles within the 650-16 fitment used on the Hupmobile 8. BFGoodrich and Garfield offer wide whitewall versions in that size, while Coker Classic and Firestone offer blackwall versions. Those sidewall choices affect the finished look of the car as much as the brand name does.

For a prewar American car, sidewall style is often part of the restoration conversation rather than a small cosmetic detail. Buyers aiming for a more formal or show-oriented presentation often compare whitewall options, while a more understated period appearance may point them toward blackwall. The best choice depends on how your particular 1938 Hupmobile is being restored and how closely you want the tire appearance to match the era and trim character of the car.

The 650-16 size used on the 1938 Hupmobile 8 is available from BFGoodrich, Coker Classic, Firestone, and Garfield. All of the listed offerings in that size are bias-ply tires, which suits the prewar character of the car. Brand choice therefore comes down more to appearance and product line preference than to switching between construction types.

Collectors often have strong preferences about tread styling, sidewall treatment, or brand heritage, and those preferences can matter on a late-prewar Hupmobile. If visual authenticity is a priority, compare the available blackwall and wide whitewall presentations first, then narrow the field by the product details that matter to your build. Since the 1938 Hupmobile range does not use one universal size, make sure you have confirmed the model before comparing brands.

Choosing the right tire for a 1938 Hupmobile starts with identifying the model, because the Hupmobile 8 and Hupmobile E do not share the same size. Both fitments belong to the bias-ply era, so the main decision is not radial versus bias-ply but making sure the tire size matches the correct car. Within 650-16, buyers can also choose between blackwall and wide whitewall styles.

Once the model is confirmed, think about the role of the car. A touring driver may prioritize a straightforward blackwall presentation, while a restoration or show car may call for a sidewall style that better suits the period appearance. The safest approach is to match the model first, compare the tire's approved wheel range where published, and then choose the visual treatment that fits your Hupmobile's restoration goals.

For 1938 Hupmobile tires in size 650-16, published fitment details show an approved rim width range of 4.50 to 5.00 inches on a 16-inch wheel. That specification applies to the 1938 Hupmobile 8 fitment where those measurements are listed. The 1938 Hupmobile E also uses a 16-inch wheel, but the key setup detail remains matching the tire size to the correct model first.

Rim width matters because it affects the tire's profile, how the sidewall stands, and how naturally the tread sits on the wheel. Even on a collector car that is driven modestly, it is wise to verify the actual wheel before mounting a replacement tire, especially if the car has had wheels swapped at some point in its life. Original-looking wheels do not always guarantee original dimensions.

1938 Hupmobile tires are period bias-ply fitments, and buyers should confirm the specific product's sidewall marking before deciding on tube use. The available 650-16 product details do not show a universal tube-type or tubeless marking across the full group, so tube requirements should be treated as product-specific rather than assumed from the size alone. That is especially important on older wheels.

Prewar rims and modern reproduction tires do not always lead to the same setup answer, even when the size is correct. If your Hupmobile still uses original-style wheels, inspect the wheel condition, valve hole, and bead seat before final assembly, and match the tube decision to the actual tire and wheel combination. A consistent approach across all five tires, including the spare, makes roadside service much easier.

The original-style 1938 Hupmobile wheels can potentially accept either listed tire size only in the narrow sense that both 650-16 and 6.25-16 are 16-inch fitments. That does not make the sizes interchangeable across the Hupmobile 8 and Hupmobile E. Wheel diameter compatibility and correct model-specific tire sizing are related, but they are not the same thing.

If you are sorting out a car with replacement wheels or mixed parts, confirm the wheel diameter first and then verify which Hupmobile model the car actually is. On the Hupmobile 8, 650-16 products list a 4.50- to 5.00-inch approved rim width range, so wheel width should also be checked rather than assumed. Keeping the tire size tied to the proper model helps preserve the car's stance and fitment logic.

A 1938 Hupmobile should be stored in a cool, dry space away from direct sunlight, electric motors, welders, battery chargers, and other ozone-producing equipment. Bias-ply tires tend to flat-spot more readily during long static storage and can show sidewall aging sooner when exposed to heat and ozone. Clean floors, moderate temperature swings, and proper inflation all help preserve the tires.

If the car sits for extended periods, move it occasionally so the same portion of the tire does not carry the load month after month. Some owners also use stands to reduce sustained weight on the tires during long-term storage, though the suspension should be supported thoughtfully rather than left hanging carelessly. A protective storage routine preserves ride quality and appearance, which matters on a prewar Hupmobile where the tires contribute heavily to the car's stance.

Tires on a 1938 Hupmobile should be judged more by age and condition than by mileage. A collector-car tire often deserves close evaluation once it reaches the five- to seven-year range, and replacement becomes a serious consideration as it approaches about ten years from its date code, even if the tread still looks usable. Low annual mileage does not stop rubber from aging.

That rule matters even more on prewar cars because many see infrequent use and spend long periods parked indoors, which can hide aging until a long drive is planned. Check the DOT date code where applicable, inspect for sidewall cracking and hardening, and include the spare in the same age review. Tires that still look presentable can still be past the point where they inspire confidence on a 1938 Hupmobile.

Tires on a 1938 Hupmobile should be inspected before every drive and again before any extended outing. Look for cracking, cuts, bulges, irregular wear, embedded debris, and any signs that the tire is losing pressure. On a collector car, a visual check is not enough if the car has been sitting for weeks or months.

Add a hands-on pressure check to the routine, and pay attention to valve stems and any tube-related service items if your final tire setup uses inner tubes. A short local drive can sometimes mask issues that become obvious only after the tire warms up at road speed. Regular inspection is one of the easiest ways to protect both the tire investment and the driving experience of a 1938 Hupmobile.

The 1938 Hupmobile 8 belongs to the prewar American era when bias-ply construction was the standard tire type, and its listed fitment here is 650-16. That makes a bias-ply 650-16 the natural starting point for an authentic restoration approach. Original equipment branding could vary by market, dealer, and period sourcing, so the key authenticity anchors are the correct size, era-correct construction, and an appropriate sidewall presentation.

If your goal is a highly accurate restoration, use the car's surviving evidence along with factory literature and Hupmobile marque resources to narrow down appearance details. Sidewall style can matter just as much as the size itself on a prewar car, especially when the visual balance of the body and wheel opening is part of the finished look. Getting the size right first keeps the restoration on solid ground.

Correct tire fitment matters significantly when showing a 1938 Hupmobile because judges and knowledgeable enthusiasts often notice tire size, construction type, and sidewall style immediately. A prewar Hupmobile wearing the wrong model-specific size or a tire appearance that clashes with the car's period character can stand out even if the rest of the restoration is strong. The tires are part of the car's silhouette.

For a judged car, focus on matching the proper size to the specific model first, then choose a sidewall style that suits the way the car would have been presented in its era. Event standards vary, so serious show preparation should include consultation with marque clubs and the rules of the organization doing the judging. That extra homework is worthwhile because tire fitment is one of the most visible finishing details.

Bias-ply construction is usually the right authenticity choice for a 1938 Hupmobile because it matches the tire technology the car was built around in the late 1930s. Both listed 1938 Hupmobile fitments are bias-ply sizes, which aligns with the period character of the make and the way prewar American cars were equipped. Construction type affects not only appearance, but also how the tire fills the wheel opening and presents its sidewall.

For restoration-minded owners, that means staying with the proper bias-ply size is the simplest way to preserve the visual language of the car. Even before anyone notices tread or branding, the tire's overall shape and stance influence how authentic the Hupmobile looks. If your car is being judged or restored to a historically faithful standard, construction type is not a small technical footnote; it is part of the car's identity.

1938 Hupmobile tires can be suitable for highway use when they are the correct size, in sound condition, and matched to the wheel properly. The available 650-16 offerings listed here are bias-ply tires, and highway use should be approached with the expectations appropriate to a late-1930s automobile rather than a modern sedan. On a car of this era, the condition of the brakes, steering, suspension, and wheel bearings often matters just as much as the tire itself.

That means a 1938 Hupmobile intended for longer road use deserves a full mechanical review instead of a tire-only mindset. Keep speeds reasonable, maintain proper inflation, and pay attention to how the car feels once warmed up, especially if it has been stored for a long period. A well-sorted prewar car on the correct tires can be enjoyable on the road, but it should always be driven within the limits of its design era.

Inflation pressure for 1938 Hupmobile tires should be set by the factory recommendation for the specific model and confirmed against the tire manufacturer's guidance for the exact product you are using. In the 650-16 size, several available bias-ply tires list a maximum load of 1,580 pounds at 32 psi. That maximum figure is part of the tire's rating, not an automatic blanket pressure setting for every use case.

The right approach is to start with the original owner's literature or accepted factory specifications for the Hupmobile 8 or E, then make sure the chosen tire's own rating supports that use. Do not transfer a pressure figure from one size to the other simply because both use 16-inch wheels. On collector cars, pressure has a direct effect on ride, steering feel, tread wear, and how well the car tracks on the road.

Before taking a 1938 Hupmobile on a longer drive, inspect each tire for cracking, cuts, bulges, uneven wear, and proper inflation, and make sure the spare is serviceable too. Check the valve stems, verify that the wheel hardware is secure, and confirm that the tires are the correct size for the specific Hupmobile model. A prewar touring day should never begin with a casual glance at old rubber.

Treat the tire check as one part of a broader road-readiness routine that also includes brakes, steering, cooling, and basic fuel-system confidence. On a car that may sit between outings, tires can look fine in the garage but reveal age or pressure loss only when put back into use. A careful pre-drive inspection reduces surprises and helps the 1938 Hupmobile feel settled and trustworthy once you are out on the road.