1928 Stearns-Knight F6-85 Tires

The 1928 Stearns-Knight F6-85 is associated with two bias-ply tire sizes: 32X6.75 and 700-20. Those are not simply two ways of writing the same size, and they relate to different wheel setups, so the first job is identifying which size is actually on the car.

A pre-war vehicle may have been re-equipped at some point, so the mounted wheels matter as much as the model designation. Check the wheel diameter, the existing tire markings, and the overall stance you want before choosing a replacement, especially if the car has not stayed on one tire setup throughout its life.

The 1928 Stearns-Knight F6-85 uses more than one rim diameter across its covered tire fitments. The 32X6.75 size is paired with a 5.0-inch rim diameter in the fitment details, while 700-20 uses a 20-inch rim and appears in the available product range for this model.

That difference makes wheel confirmation essential before ordering tires. Measure the actual wheel on the car and compare it with the tire size stamped on the sidewall, because choosing a tire by model name alone can lead to a mismatch on a car that has seen decades of service, repairs, or restoration changes.

The 1928 Stearns-Knight F6-85 Base is associated with the same two bias-ply sizes covered for this model: 32X6.75 and 700-20. In practical terms, that means the Base designation does not narrow the choice to one tire size by itself.

Instead of relying on the sub-model name, inspect the car's actual wheel and tire setup. On an automobile from this era, long ownership history, replacement wheels, or earlier restoration decisions can affect what is mounted now, and that physical confirmation is the safest way to select the right vintage tire size.

Start with the basics: confirm that the car is on 20-inch wheels and that 700-20 is the intended fitment for its current setup. From there, compare the available bias-ply options by sidewall style, tire series, rim-width specification, and whether the tire is more passenger-car oriented or carries truck-style characteristics.

Appearance matters on a late-1920s luxury car, so blackwall, wide whitewall, and double-whitewall choices can change the car's presentation significantly. Load-related product differences also deserve attention, especially on a large pre-war automobile, and wheel width should be checked against the tire being considered before making a final selection.

For 700-20 fitment on the 1928 Stearns-Knight F6-85, the available sidewall styles include blackwall, wide whitewall, and double-whitewall. Those choices give the car very different visual character, from a more restrained touring look to a brighter pre-war luxury presentation.

Sidewall style does not change the need to stay within the correct tire size and wheel setup. It is best to choose the look that matches the car's restoration direction, photographs from its era, or the style already established on the vehicle, then confirm rim compatibility before settling on a specific tire.

The 700-20 tire size for the 1928 Stearns-Knight F6-85 is available from Firestone, BFGoodrich, and Denman. Those offerings appear across several vintage tire series, including Firestone Balloon, Silvertown Classic Bias Ply, Highway Classic Truck, and Firestone Classic Truck.

Brand alone should not drive the decision on a car like this. Compare the specific tire's sidewall treatment, intended visual character, rim-width specification, and any load information that applies, since those details often matter more than the name on the sidewall when matching a pre-war automobile to its use.

A period-style 1928 Stearns-Knight F6-85 should stay with the correct bias-ply sizing for the wheel setup actually on the car, whether that is 32X6.75 or 700-20. Within 700-20, the available choices include traditional blackwall as well as whitewall and double-whitewall presentations that suit different restoration directions.

The best visual match depends on how the car is being finished rather than on one universal answer for every F6-85. Owners pursuing stricter historical accuracy should compare surviving photos, marque references, and restoration records, while drivers focused on overall era character can choose the sidewall style that fits the car's appearance and use.

Correct tire fitment has a major effect on the finished look of a 1928 Stearns-Knight F6-85. Tire size influences the car's stance and wheel-to-body proportion, while construction and sidewall style shape whether the car reads as formal, understated, or more visibly dressed in late-1920s luxury fashion.

The restoration decision starts with using the right size for the wheels on the vehicle now. Once that is settled, details such as blackwall versus whitewall treatment and the character of the chosen tire series become part of the overall presentation, especially on a pre-war car where tire profile is such a visible design element.

Yes. A 1928 Stearns-Knight F6-85 can be affected by later wheel changes, brake work, suspension repairs, or other restoration-era modifications that alter what tire size the car can reasonably use. That is especially important here because 32X6.75 and 700-20 relate to different wheel arrangements.

Check the actual wheel diameter and width before selecting replacement tires, and look closely at fender, steering, and suspension clearance if anything on the chassis has been altered. Even on a large pre-war car, changed hardware can influence fitment, so the vehicle's current configuration matters more than assumptions based on age alone.

Before road use, inspect wheel condition, valve hardware, lug security, and the overall condition of the suspension and steering components. New tires should also be checked for proper inflation, even seating on the rim, and adequate clearance around fenders, brake components, and any nearby chassis parts.

A pre-war car often sits for long periods, so the first drive should be conservative. Recheck inflation after the tires have settled, watch for any rubbing during turns, and look over the tires again after a short drive to confirm there is no unusual wear pattern, air loss, or contact issue developing.

700-20 bias-ply tires on a collector 1928 Stearns-Knight F6-85 should be kept properly inflated, inspected regularly for cracking, cuts, bulges, and uneven wear, and protected from long exposure to sunlight, moisture, and ozone sources during storage. A car that is seldom driven still needs routine tire attention.

Maintenance also includes watching for slow air loss and checking the wheels themselves for condition issues that can affect the tire. Occasional movement helps avoid prolonged flat-spotting, and any tire that shows age-related deterioration should be evaluated before road use, even if the tread still looks serviceable on a lightly used collector car.