The 1926 DuPont D comes from a brief but memorable chapter in American luxury motoring, when prestigious cars relied on substantial wheel and tire dimensions to match their long-wheelbase presence and road manners. For owners of this exact car, tire selection centers on two period bias-ply sizes, 32X6.20 and 650-20, both built around a 20-inch rim. That keeps the fitment story rooted in traditional construction, with choices shaped more by appearance and use than by modern sizing conversions. Whitewall and blackwall options, along with passenger-car and truck-style tread offerings, make it important to match the tire to the car's restoration direction and intended driving.
Which Tire Size Is Right for The 1926 DuPont D
The 1926 DuPont D uses two primary tire sizes, and both are bias-ply fitments associated with a 20-inch rim. Because the covered 6 Cyl. sub-model uses both sizes, the key decision is not identifying a different trim, but deciding which period-style sizing format, tread character, and sidewall presentation best suits the car's wheels, appearance goals, and road use.
The 32X6.20 size uses an older diameter-by-section format, where 32 refers to the tire's approximate overall diameter and 6.20 refers to its nominal section width. It is a bias-ply fitment that suits the pre-war character and wheel proportions expected on a 1926 DuPont D. Buyers often encounter this format when preserving an early-car look rather than moving to later numeric sizing conventions. It is worth evaluating when the goal is to stay close to an antique-style tire presentation and to confirm that the wheel and overall setup match this larger-format period sizing.
The 650-20 size is a numeric bias-ply format in which 650 represents a nominal 6.50-inch section width and 20 identifies the rim diameter in inches. On the 1926 DuPont D, this size opens up the broadest visible product choice, including Firestone, Denman, and Deka offerings, along with blackwall and wide whitewall styles across classic bias-ply and truck-oriented series. That makes it especially useful for owners who want to compare appearance, tread character, rim-width compatibility, and load-oriented specifications while staying with a traditional bias-ply construction.
Fitment is straightforward here because the covered 1926 DuPont D sub-model uses the same two primary tire sizes. Checking the exact sub-model still matters so the tire choice stays aligned with the car's wheel setup, restoration direction, and intended road use.
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1926 DuPont D 6 Cyl.
The 1926 DuPont D 6 Cyl. uses the same pair of bias-ply fitments used across this page, so the decision centers on which of the two period sizes best matches the car. That means comparing traditional appearance, available sidewall treatments, and wheel compatibility rather than searching for a different trim-specific size.
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.
Best 1926 DuPont D Tires for Sale
Available 650-20 tires for the 1926 DuPont D include Firestone, Denman, and Deka options in classic bias-ply and truck-style series. Buyers can compare blackwall and wide whitewall presentations, along with differences in rim-width specifications, weight, and load-related details.
Common 1926 DuPont D tire questions usually come down to choosing between 32X6.20 and 650-20, understanding 20-inch rim fitment, and selecting a bias-ply tire that suits the car's appearance, restoration priorities, and road use.
Tire Size & Fitment
What tire size fits a 1926 DuPont D?
The 1926 DuPont D uses two primary bias-ply tire sizes: 32X6.20 and 650-20. Both sizes are associated with the covered 6 Cyl. configuration, so the fitment question is less about trim differences and more about which period size convention matches the car's current wheel setup and restoration direction.
A careful check of the wheels already on the car is the next step, especially on an older luxury car that may have seen wheel changes over the years. Tire size markings, rim dimensions, and overall clearance should all be confirmed before choosing between the antique diameter-by-section format and the later numeric bias-ply format.
What size rim does a 1926 DuPont D use?
The 1926 DuPont D uses a 20-inch rim with its primary tire fitments. The 650-20 size makes that easy to see in the size code itself, and the vehicle's fitment remains centered on that 20-inch wheel diameter rather than a smaller modern passenger-car rim.
Rim diameter is only one part of the fitment picture on a car of this era. Wheel width and actual wheel type should also be checked before mounting a new set, especially if the car has replacement wheels, older restorations, or mixed components that may not match the original-style setup.
Does the 1926 DuPont D 6 Cyl. use the same tire size?
The 1926 DuPont D 6 Cyl. uses the same two primary tire sizes covered for this model: 32X6.20 and 650-20. Both are bias-ply fitments, so sub-model selection does not create a separate tire-size path within the covered DuPont D lineup here.
That consistency simplifies the search, but it still leaves an important choice between two period sizing conventions. Owners should verify which size is actually on the car now, how the wheels are marked, and whether the restoration is aiming for a particular visual stance or a more road-use-oriented tire selection.
Choosing the Right Tire
What should I consider when choosing a 650-20 tire for a 1926 DuPont D?
Start with the correct size, traditional bias-ply construction, and the 20-inch rim requirement. From there, the 650-20 choices for a 1926 DuPont D vary by brand, tire series, sidewall style, rim-width specification, weight, and in some cases load capacity details tied to inflation pressure.
Appearance and use should guide the final choice. A wide whitewall can support a more formal restoration-oriented presentation, while blackwall and truck-style tread options may suit a different visual goal or a car that sees more practical road use. Wheel dimensions should always be confirmed before narrowing the selection.
What sidewall styles are available for 1926 DuPont D tires?
The available 650-20 tire choices for a 1926 DuPont D include blackwall and wide whitewall sidewall styles. That gives owners a meaningful appearance choice while staying within the correct period construction type and rim diameter for this early luxury-car fitment.
Sidewall style can change the character of the car as much as the tread itself. A wide whitewall tends to create a more formal, restoration-oriented look, while blackwall choices keep the presentation more understated or more utility-focused. The right choice depends on how the car is being restored, displayed, and driven.
What brands offer tires for the 1926 DuPont D?
Firestone, Denman, and Deka all appear in the available 650-20 tire selection for the 1926 DuPont D. Those offerings span classic bias-ply passenger-style and truck-oriented series, so brand choice is tied closely to tread character, sidewall presentation, and other specification differences rather than size alone.
A useful comparison goes beyond the brand name on the sidewall. Look at the tire series, whether the sidewall is blackwall or wide whitewall, the wheel-width range where stated, and any load-related details that matter for the car's use. That approach keeps the choice focused on fitment and presentation instead of simple brand preference.
Restoration & Appearance
Which tire should I choose for a period-style 1926 DuPont D?
A period-style 1926 DuPont D should stay with one of its primary bias-ply fitments, either 32X6.20 or 650-20, depending on the wheel setup and the look being pursued. Both sizes keep the car within an authentic early-tire conversation rather than pushing it toward later radial conversions or modern sizing language.
The finer decision usually comes down to presentation and how the car is being finished. Whitewall versus blackwall, passenger-style versus truck-style tread character, and the visual proportion of the chosen size all affect the final appearance. When exact historical originality matters, marque-specific restoration references are still worth consulting.
How does tire construction affect the appearance of a restored 1926 DuPont D?
Bias-ply construction plays a major role in the appearance of a restored 1926 DuPont D because it preserves the traditional tire profile and overall visual character expected on a car from the mid-1920s. That construction also works naturally with the period sizing formats used on this model, including 32X6.20 and 650-20.
The visible result is shaped further by tread style and sidewall treatment. A wide whitewall can emphasize elegance, while a blackwall can create a more restrained or utility-oriented presentation. Matching the tire's visual style to the restoration goal helps the car look coherent instead of mixing an early chassis with a conflicting tire impression.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1926 DuPont D?
Yes, modifications can affect tire fitment on a 1926 DuPont D even when the size code appears correct. Replacement wheels, brake updates, suspension work, body adjustments, or changes made during an older restoration can alter the wheel width, mounting surface, and available clearance around the tire.
That is why a visual inspection and measurement check matter before mounting new tires. Steering clearance, fender clearance, and actual wheel dimensions should all be verified on the car as it sits today. Early cars often carry a long service history, so current hardware matters more than assumptions based on the year alone.
What should I inspect before driving a 1926 DuPont D on new tires?
Before driving a 1926 DuPont D on new tires, inspect the wheels, valve hardware, mounting condition, and overall tire seating, then confirm inflation pressure appropriate to the tire being used. It also makes sense to check brake function, steering response, and whether each tire clears the body and suspension through its travel.
A short, careful test drive is a smart follow-up on a collector car of this age. Listen for rubbing, watch for pull or shimmy, and recheck pressure after the first miles. Early luxury cars place a lot of visual and mechanical emphasis on wheel-and-tire fitment, so small issues are worth catching before a longer outing.
How should 650-20 tires on a collector 1926 DuPont D be maintained?
650-20 tires on a collector 1926 DuPont D should be maintained with regular pressure checks, visual inspections, and careful storage habits. Sidewall cracking, tread separation, cuts, bulges, and slow air loss all deserve attention, especially on a car that spends long periods parked between events or short drives.
Collector vehicles often age their tires through time as much as mileage. Keeping the car away from prolonged sunlight, excessive heat, moisture, and ozone sources helps preserve the rubber, and moving the car periodically can help avoid long-term flat spotting. Any sign of age-related deterioration should be evaluated before road use.
