The 1931 Nash 70 Series comes from an era when automakers balanced engineering seriousness with increasingly refined styling and road manners. For many collector-car owners, it represents the practical, well-built character of the early Depression-era American automobile, where correct proportions matter as much as mechanical condition. This Nash uses a 5.25-19 bias-ply tire, a traditional fitment that suits the vehicle’s period wheel and overall presentation. The real choice is less about size and more about selecting the right period-style tire within that specification while keeping restoration goals, ride expectations, and wheel condition in mind before putting the car back on the road.
Which Tire Size Is Right for The 1931 Nash 70 Series
The 1931 Nash 70 Series uses one primary tire size: 5.25-19, a bias-ply fitment for a 19-inch rim. That keeps the size question straightforward, including the covered 8 Cyl. sub-model, so the decision shifts to choosing an appropriate period-style tire and confirming that the car still has the correct wheels and overall setup.
The 5.25-19 size uses a vintage numeric bias-ply format in which 5.25 refers to the nominal section width in inches and 19 identifies the rim diameter. Bias-ply construction matches the kind of tire layout associated with early 1930s American passenger cars and preserves the traditional look and stance expected on a Nash of this period. On a 1931 Nash 70 Series, this size is the key starting point for any replacement decision. The practical next step is confirming that the existing wheels are still 19-inch units in suitable condition before selecting a tire for restoration display or regular collector-car road use.
Fitment is straightforward across the covered 1931 Nash 70 Series sub-models because the same primary tire size is used throughout. Checking the exact sub-model still helps confirm that the car remains on the proper wheel and tire setup before replacement.
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1931 Nash 70 Series 8 Cyl.
The 1931 Nash 70 Series 8 Cyl. uses the same 5.25-19 bias-ply fitment as the model core, so tire selection stays focused on the proper vintage size rather than choosing between multiple fitments. That makes the decision more about maintaining a period-style appearance and verifying wheel condition on a car that may have seen decades of service or restoration work.
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
Owners of a 1931 Nash 70 Series usually need clear guidance on the 5.25-19 tire size, 19-inch rim fitment, period-style bias-ply selection, restoration appearance, and the inspections worth making before any collector car returns to road use.
Tire Size & Fitment
What tire size fits a 1931 Nash 70 Series?
The 1931 Nash 70 Series uses a 5.25-19 tire size. This is a numeric bias-ply fitment, and it is the primary size associated with the covered vehicle and its 8 Cyl. sub-model.
That means the first goal is not comparing several possible sizes, but making sure the car still has the correct 19-inch wheels and a wheel setup that matches the original style of fitment. On collector cars, decades of repairs, wheel swaps, or incomplete restorations can change what is currently on the vehicle, so checking the actual rim before ordering a replacement tire is always worthwhile.
What size rim does a 1931 Nash 70 Series use?
The 1931 Nash 70 Series uses a 19-inch rim with its 5.25-19 tire size. In this size format, the final number identifies the wheel diameter, so the tire is built for a 19-inch wheel.
Rim diameter is only one part of the fitment picture, especially on an early 1930s vehicle. It is smart to inspect the wheel itself for condition, verify that all wheels on the car match, and make sure no later replacements were installed. A tire in the correct size still needs a sound wheel and enough overall clearance to be used confidently on a restored or road-driven Nash.
Does the 1931 Nash 70 Series 8 Cyl. use the same tire size?
Yes. The 1931 Nash 70 Series 8 Cyl. uses the same 5.25-19 bias-ply tire size as the model core. There is no separate primary tire size called out for that covered sub-model.
That consistency simplifies replacement because the main concern is not choosing between trims with different tires. Instead, attention can stay on verifying the actual wheels on the car and choosing a tire that matches the vehicle’s intended use. For a preservation-minded car, appearance may lead the decision, while a more regularly driven example may place more emphasis on overall condition and road-readiness.
Choosing the Right Tire
What should I consider when choosing a 5.25-19 tire for a 1931 Nash 70 Series?
Start with the correct primary size, which is 5.25-19, and keep the original-style bias-ply construction in mind. On a 1931 Nash 70 Series, that size is the foundation of proper fitment and the best starting point for maintaining the vehicle’s traditional proportions.
After size is confirmed, the real decision becomes how the car will be used and presented. A restoration-focused owner may prioritize a period-style look, while a driver may be more concerned with wheel condition and overall readiness for road use. It is also wise to inspect all five wheels if a spare is carried, since mismatched or aging rims can complicate an otherwise straightforward tire replacement.
How do I choose between the available 5.25-19 tires for a 1931 Nash 70 Series?
With a single primary size, the comparison is less about fitment and more about the character of the tire you want on the car. For a 1931 Nash 70 Series, any serious comparison should begin with the 5.25-19 specification and the traditional bias-ply construction associated with it.
From there, look at how closely the tire suits the car’s intended presentation and use. A show-oriented Nash may call for a more restoration-minded appearance, while a touring car still needs a tire that works with the existing wheel condition and overall setup. It helps to inspect the wheels, valve hardware, and mounting surfaces before making a final choice, especially on older rims that may have corrosion or past repair work.
What rim-fitment details should I compare when choosing 1931 Nash 70 Series tires?
The most important rim-fitment detail is confirming that the car still uses 19-inch wheels, because the 1931 Nash 70 Series tire size is 5.25-19. The tire size and wheel diameter need to match before any other selection factor matters.
It also helps to inspect whether all wheels are the same type and in usable condition, since collector cars sometimes pick up mismatched replacements over time. A proper tire choice can still be undermined by bent rims, corrosion around the bead area, or worn hardware. Looking over the complete wheel setup before mounting new tires reduces surprises and helps keep the Nash’s stance and fitment consistent.
Restoration & Appearance
Which tire should I choose for a period-style 1931 Nash 70 Series?
A period-style 1931 Nash 70 Series should begin with the correct 5.25-19 size and traditional bias-ply construction. That combination preserves the kind of visual proportion and tire profile expected on an early 1930s American automobile.
For many restorations, appearance is just as important as simple fitment, since tire shape strongly affects how the car sits and presents. Exact originality can involve details beyond size alone, so owners pursuing a highly accurate restoration should compare the finished look against marque-specific references, period photos, and trusted Nash restoration guidance before settling on a final tire choice.
Does correct tire fitment matter for a 1931 Nash 70 Series restoration?
Yes, correct tire fitment matters a great deal on a 1931 Nash 70 Series restoration. The 5.25-19 size and its bias-ply format affect the car’s stance, wheel appearance, and the overall visual balance that people expect from a vehicle of this era.
Even a well-restored car can look noticeably off if the tire size or construction does not suit the period. Beyond appearance, correct fitment also helps avoid issues with wheel compatibility and clearance. Before mounting new tires, inspect the rims, confirm uniform wheel diameter across the car, and make sure any earlier restoration work did not introduce later components that change the original tire fitment path.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1931 Nash 70 Series?
Yes. Modifications can affect tire fitment on a 1931 Nash 70 Series, even when the intended tire size remains 5.25-19. Wheel substitutions, brake changes, suspension work, or body repairs can alter how much space the tire has and whether the wheel setup still matches the original configuration.
A car from this era may also have had decades of small changes that are easy to miss at first glance. Checking wheel diameter, wheel condition, steering clearance, and the relationship between the tire and fender opening helps prevent surprises after mounting. A close inspection is especially important if the Nash sits differently than expected or shows signs of earlier restoration or custom work.
What should I inspect before driving a 1931 Nash 70 Series on new tires?
Inspect the wheels, valve hardware, and overall tire mounting surfaces before driving a 1931 Nash 70 Series on new tires. It also makes sense to look over tread seating, sidewall condition, and air retention once the tires are mounted and the car has been sitting for a short period.
A low-use collector car deserves a broader walkaround before road use. Check for loose wheel hardware, signs of rubbing, uneven ride height, and any age-related cracking elsewhere in the chassis or suspension that could affect tire clearance. Early cars often spend long periods parked, so a short local drive and reinspection can reveal issues before a longer outing places sustained stress on the wheels and tires.
How should 5.25-19 tires on a collector 1931 Nash 70 Series be maintained?
Maintain 5.25-19 tires on a collector 1931 Nash 70 Series by keeping them properly inflated, inspecting them regularly, and storing the car in conditions that reduce heat, sunlight, moisture, and ozone exposure. Collector-car tires often age from time and environment as much as from mileage.
Routine checks should include looking for sidewall cracking, cuts, bulges, irregular wear, and slow air loss. It is also wise to inspect the wheels themselves, because older rims can develop corrosion or fatigue that affects long-term serviceability. If the Nash is driven only occasionally, seasonal inspections are a good habit, and any questionable tire or wheel condition should be evaluated before the car returns to regular road use.
