1928 Marmon 75 Series Tires

The 1928 Marmon 75 Series is associated with two primary bias-ply tire sizes: 32X6.75 and 700-20. Those are not just two ways of writing the same size. They represent different fitment formats, and they also correspond to different rim diameters, so the right choice depends on the wheel setup actually installed on the car.

A buyer should start by checking the wheel diameter and the existing tire markings before selecting a replacement. On a collector car of this age, wheels may have been changed during earlier restorations or decades of service. Once the wheel setup is confirmed, the next step is choosing the appropriate sidewall style and tire series for the car's appearance and intended use.

Rim size depends on which tire fitment the 1928 Marmon 75 Series is using. The 32X6.75 tire is tied to a 5.0-inch rim diameter in this application, while the 700-20 tire uses a 20-inch rim. That difference makes wheel verification the most important step before ordering replacement tires.

The safest approach is to inspect the wheels already on the car rather than assuming both sizes apply to the same hardware. A vehicle from the late 1920s may have had wheel changes, restoration updates, or mixed components over time. Matching tire size to actual wheel diameter is essential before comparing sidewall style, rim-width specification, or product series.

The 1928 Marmon 75 Series is associated with both 32X6.75 and 700-20 because older vehicles can appear with more than one established fitment path. In this case, both are bias-ply sizes, but they use different sizing systems and different wheel diameters, so they should be treated as separate configurations rather than casual substitutes.

That means the first decision is not which sidewall looks best, but which setup is actually on the car. Checking the wheel, the tire markings, and the car's current stance helps prevent ordering a tire built for the wrong rim. After that, the buyer can compare passenger-car and truck-oriented offerings, whitewall treatments, and other period-style choices.

Start with the basics: the tire must be a 700-20 bias-ply and must suit the wheel width used on the car. Within that size, choices vary by brand, sidewall style, tire series, weight, and load specification. Firestone, BFGoodrich, and Denman all appear in this size, with both passenger-style and truck-oriented options.

The best choice depends on how the Marmon will be presented and driven. A restoration-focused car may call for a whitewall or double-whitewall look, while a more utility-minded setup may point toward a blackwall or truck-tread design. Rim-width compatibility should be checked carefully, especially if the wheels are not known to be original to the current setup.

For the 700-20 fitment used on the 1928 Marmon 75 Series, available sidewall styles include blackwall, wide whitewall, and double-whitewall. Those options create noticeably different visual character even when the size remains the same. Sidewall style is one of the biggest appearance decisions on a pre-war luxury car once the correct fitment has been confirmed.

A blackwall tire tends to give a more restrained, functional presentation, while wide whitewall and double-whitewall designs bring more emphasis to the wheel opening and overall period look. The right choice depends on the restoration direction of the car and the style of wheel in use. Appearance should be considered alongside proper size, construction, and wheel compatibility.

The 700-20 size for the 1928 Marmon 75 Series is available from Firestone, BFGoodrich, and Denman. Those offerings span several tire series, including Firestone Balloon, Silvertown Classic Bias Ply, Highway Classic Truck, and Firestone Classic Truck. All of them are bias-ply options, but they differ in presentation and intended character.

Brand choice should be treated as one part of a broader fitment decision, not the decision by itself. Compare the sidewall style, the tire series, the rim-width specification, and any load figure that matters for the car's use. A pre-war touring car may look and feel very different depending on whether the tire leans toward traditional passenger styling or truck-style utility.

A period-style starting point for a 1928 Marmon 75 Series is a bias-ply tire in the correct primary size for the wheels on the car, either 32X6.75 or 700-20. Within the 700-20 fitment, Firestone Balloon and Silvertown Classic Bias Ply options offer a traditional look that suits a late-1920s luxury automobile.

Exact restoration goals should guide the final choice. Some owners will prefer blackwall simplicity, while others may want a wide whitewall or double-whitewall presentation that complements the car's era. If originality matters at a very high level, compare the tire selection against period photos, marque-club guidance, and other vehicle-specific references before settling on a final style.

Correct tire fitment matters a great deal on a 1928 Marmon 75 Series because tire size strongly affects the car's stance, proportions, and overall presence. On a pre-war luxury car, the visual relationship between the body, fenders, wheels, and sidewalls is a major part of the restoration result, not just a minor finishing detail.

Fitment also matters mechanically. A tire built for the wrong wheel diameter or an unsuitable rim width can create mounting and clearance problems before the car ever reaches the road. Confirming the actual wheel setup first helps preserve both the visual character of the Marmon and the practical integrity of the finished restoration.

Yes. Any change to wheels, wheel width, ride height, springs, or brake hardware can affect tire fitment on a 1928 Marmon 75 Series. That is especially important here because the car is associated with two different tire sizes and two different rim diameters. Even small changes can alter clearance at the fender, steering components, or suspension.

A restored or long-owned car may not still have the wheel setup it left with decades ago. Measuring the actual wheel diameter and width is a better starting point than assuming the car remains unchanged. Clearance should also be checked at full steering lock and through suspension movement before putting the car back into regular road service.

Before driving a 1928 Marmon 75 Series on new tires, inspect the wheels, valve hardware, and overall mounting condition, then confirm proper inflation for the tire being used. The tire should seat correctly on the wheel and should show no signs of sidewall damage, shipping injury, or irregular mounting after installation.

A short, careful road test is worthwhile before any longer outing. Watch for rubbing, steering pull, vibration, or unusual contact at the fenders and suspension points. On an older collector car, it also makes sense to recheck lug tightness, pressure retention, and visual condition after the first miles, since storage history and wheel age can influence early behavior.

700-20 tires on a collector 1928 Marmon 75 Series should be kept properly inflated, inspected regularly, and protected from long periods of harsh storage conditions. Even when tread wear is minimal, age-related deterioration can still appear in the form of cracking, flat spotting, air loss, or changes in sidewall condition after extended time parked.

A collector car benefits from periodic pressure checks and visual inspection before every meaningful drive, not just at seasonal service intervals. Storage away from prolonged sunlight, heat, moisture, and ozone sources can help preserve tire condition. It is also smart to watch for uneven wear patterns, since alignment, wheel condition, and suspension wear can show up quickly on older vehicles.