The 1938 Graham Standard Supercharger comes from one of the more distinctive late-1930s American marques, a car remembered for its bold styling and for carrying the Graham name into the final prewar years. Owners drawn to these cars usually care as much about stance and period character as they do about simple replacement fitment. This model uses a 6.25-16 bias-ply tire on a 16-inch rim, which keeps the fitment conversation centered on authentic construction and proper wheel compatibility. The main choice is less about size and more about selecting a tire that suits restoration goals and intended road use. That makes careful attention to condition, wheel measurements, and traditional appearance especially important.
Which Tire Size Is Right for The 1938 Graham Standard Supercharger
The 1938 Graham Standard Supercharger uses one primary tire size: 6.25-16. It is a bias-ply fitment on a 16-inch rim, and the covered 6 Cyl. sub-model uses that same size. Since size selection is straightforward, the real decision is choosing the right 6.25-16 tire for the car’s restoration style, wheel compatibility, and planned road use.
A 6.25-16 size is a numeric bias-ply designation in which 6.25 refers to the nominal section width in inches and 16 identifies the wheel diameter. On a 1938 Graham Standard Supercharger, that sizing keeps the car in a traditional prewar tire format rather than moving into a later alphanumeric or modern metric system. Bias-ply construction also plays a major role in the car’s visual stance and period-style presentation. Choosing this size means focusing on proper 16-inch wheel compatibility, the condition of the existing wheels, and whether the goal is faithful restoration character or general collector-car road use.
Fitment is straightforward across the covered 1938 Graham Standard Supercharger sub-models. The main reason to check the exact sub-model is simply to confirm that the car remains on its original tire-size and wheel-diameter pattern before choosing a replacement tire.
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1938 Graham Standard Supercharger 6 Cyl.
The 1938 Graham Standard Supercharger 6 Cyl. uses the same 6.25-16 bias-ply fitment associated with this model line. Tire selection therefore comes down to choosing a proper period-style replacement in the correct construction and confirming that the car still has compatible 16-inch wheels.
The tire sizes listed on this page assume factory-standard vehicle configuration. The following modifications may affect tire fitment and are not reflected in this guide:
Suspension changes (lowering, lift kits, spring replacements)
Body alterations (fender modifications, custom bodywork)
If your vehicle has been modified from factory specifications, verify tire clearance before purchase.
Frequently Asked Questions
These FAQs focus on 1938 Graham Standard Supercharger tire size, 16-inch rim fitment, bias-ply construction, restoration-minded selection, and the inspections that matter before putting a prewar collector car back on the road.
Tire Size & Fitment
What tire size fits a 1938 Graham Standard Supercharger?
The 1938 Graham Standard Supercharger uses a 6.25-16 tire. That is a numeric bias-ply size, and it is the primary fitment for this vehicle. The covered 6 Cyl. sub-model uses the same size, so the fitment question is centered on choosing the correct construction and confirming wheel compatibility rather than sorting through multiple primary sizes.
A 6.25-16 tire belongs on a 16-inch wheel, so the next step is verifying the actual wheel diameter on the car before ordering replacements. Many prewar vehicles have seen wheel swaps over the years, and collector cars may also have older tires still mounted. Matching the proper size is important for stance, clearance, and preserving the traditional look that suits a late-1930s Graham.
What size rim does a 1938 Graham Standard Supercharger use?
The 1938 Graham Standard Supercharger uses a 16-inch rim with its 6.25-16 tire size. In this format, the last number in the tire size identifies the wheel diameter, so the tire and wheel are matched around a 16-inch fitment. That rim diameter is part of the car’s original-style prewar tire setup.
Wheel diameter should always be confirmed on the car itself, especially on an older collector vehicle that may have had parts changed over time. A tire can have the correct overall style yet still be wrong for the wheel if the diameter does not match. It is also worth checking wheel condition, bead-seat cleanliness, and whether the wheels remain suitable for continued road use.
Does the 1938 Graham Standard Supercharger 6 Cyl. use the same tire size?
Yes. The 1938 Graham Standard Supercharger 6 Cyl. uses the same 6.25-16 bias-ply tire size as the covered model fitment. That keeps the size decision simple and avoids the confusion that can come with later vehicles that changed tire sizes by trim level, package, or wheel option.
Even with shared fitment, it is still smart to confirm what is actually mounted on the car today. Prewar cars are often restored over many decades, and wheels or tires may not match the intended setup. Once the 6.25-16 size and 16-inch wheel diameter are verified, attention can shift to choosing a tire that matches the car’s restoration character and expected driving use.
Choosing the Right Tire
What should I consider when choosing a 6.25-16 tire for a 1938 Graham Standard Supercharger?
Start with the basics: the tire should be the correct 6.25-16 size and the proper bias-ply construction for this fitment. On a prewar car like the 1938 Graham Standard Supercharger, construction affects not only compatibility but also the vehicle’s visual character, stance, and the traditional driving feel many collectors want to retain.
Beyond size, look closely at wheel condition, how the car will be used, and whether the goal is road touring or restoration-oriented presentation. A collector car that is driven only occasionally may prioritize period-style appearance, while a more regularly used car may place greater emphasis on fresh rubber and careful setup. The right choice is the one that respects both the car’s fitment and its intended use.
How do I choose between the available 6.25-16 tires for a 1938 Graham Standard Supercharger?
The key is to compare the tires within the correct 6.25-16 bias-ply fitment rather than looking for a different primary size. For a 1938 Graham Standard Supercharger, the real distinctions are usually construction style, period presentation, and how closely a tire suits the type of restoration or driving the car is expected to see.
A car built for show-field authenticity may call for a different visual approach than one intended for occasional local driving. It also helps to consider the age and condition of the other chassis components, since steering and suspension wear can influence how satisfying the car feels on the road. Matching the tire choice to the vehicle’s purpose usually leads to a better result than chasing appearance alone.
What rim-fitment details matter when choosing tires for a 1938 Graham Standard Supercharger?
The most important rim-fitment detail is confirming that the car still has 16-inch wheels to match the 6.25-16 tire size. After that, attention should turn to the wheel’s overall condition, including signs of damage, corrosion, poor previous repairs, or distortion that could affect how the tire mounts and seats.
Prewar wheels deserve especially careful inspection because age alone can create issues even on cars that are driven sparingly. It is wise to check that all four wheels match, that the mounting surfaces are sound, and that no past modifications changed the intended setup. A correct tire size is only part of the equation if the wheels themselves are no longer in suitable condition.
Restoration & Appearance
Which tire should I choose for a period-style 1938 Graham Standard Supercharger?
A period-style 1938 Graham Standard Supercharger should start with the correct 6.25-16 bias-ply fitment. That size and construction preserve the prewar sizing convention and help maintain the visual proportions that suit the car’s late-1930s body design. For many restorers, staying with the proper numeric bias-ply format is a central part of keeping the car’s character intact.
Appearance choices should support the era of the vehicle without assuming that any current tire is automatically an exact factory match. Buyers pursuing strict historical accuracy should compare tire details against marque-club guidance, period photos, and restoration documentation for their specific car. Even when originality is not the main goal, correct fitment still matters for stance, wheel presentation, and overall visual balance.
Does correct tire fitment matter for a 1938 Graham Standard Supercharger restoration?
Yes, correct tire fitment matters a great deal on a 1938 Graham Standard Supercharger restoration. The 6.25-16 bias-ply size is part of the car’s proper visual scale, and a different size or construction can change how the car sits, how the wheel openings look, and how authentic the finished restoration appears to knowledgeable enthusiasts.
Restoration-minded owners should think of tire fitment as both a functional and visual decision. A tire that is close in spirit but off in size can alter the car’s presence more than expected, especially on a prewar design with prominent fenders and tall sidewalls. Taking time to confirm the wheel setup and intended presentation helps avoid choices that look out of place once the car is complete.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1938 Graham Standard Supercharger?
Yes. Modifications can affect tire fitment on a 1938 Graham Standard Supercharger even when the intended tire size remains 6.25-16. Changes to wheels, suspension components, ride height, brake hardware, or body panels can all influence clearance and how the tire sits in the wheel opening, especially on an older vehicle that may have been repaired or altered over time.
A car with aftermarket wheels or altered suspension should be measured carefully before replacement tires are chosen. Clearance at full steering lock, fender spacing, and the relationship between the tire and the wheel all deserve attention. A traditional size can still create issues if the vehicle no longer matches its original-style setup, so condition and configuration should be verified together.
What should I inspect before driving a 1938 Graham Standard Supercharger on new tires?
Before driving a 1938 Graham Standard Supercharger on new tires, inspect the wheels, valve hardware, and the overall condition of the steering and suspension. A prewar car should also be checked for loose or worn components that could affect tracking and ride quality. New tires perform best when the surrounding chassis is ready for the road as well.
It is also smart to confirm proper tire pressure, look for any interference through the steering range, and recheck fasteners after initial installation. Collector cars that sit for long periods can hide issues like dry components, uneven braking, or long-neglected alignment concerns. A cautious test drive and a follow-up inspection help ensure the new tires are working with the car rather than exposing other problems.
How should 6.25-16 tires on a collector 1938 Graham Standard Supercharger be maintained?
6.25-16 tires on a collector 1938 Graham Standard Supercharger should be maintained with regular pressure checks, visual inspections, and careful storage habits. Even a car that covers very few miles can develop tire problems from age, heat, sunlight, or long stationary periods. Sidewall cracking, bulges, cuts, and persistent air loss all deserve prompt attention.
Storage conditions matter nearly as much as mileage on a prewar collector car. Keeping the vehicle away from prolonged sunlight, moisture, and ozone sources can help protect the tires between drives. It also helps to inspect the tires before every outing rather than assuming low annual mileage means they are road-ready. Collector-car tires often age out before they wear out.
