1928 Stearns-Knight Tire Fitment Guide

1928 Stearns-Knight vehicles use two tire sizes: 32X6.75 and 700-20. Both sizes apply across the full model range, including the 1928 Stearns-Knight 8H, 8J, and F6-85. The 700-20 products mount on 20-inch rims, with listed rim width ranges of 3.75 to 4.00 inches on Firestone offerings and 5.00 to 5.50 inches on BFGoodrich offerings.

That means year and make alone are not enough if your car has changed wheels over time. A buyer should first verify which size is currently fitted or which wheel setup the car is built around, then choose the sidewall style and brand that best match the restoration. On a car from this period, measuring the wheel and comparing the existing tire markings is often the fastest path to the right choice.

On a 1928 Stearns-Knight, 32X6.75 is an antique diameter-by-section size. The first number, 32, refers to the tire's overall diameter in inches, while 6.75 refers to the nominal section width. It is a bias-ply style size from an earlier tire-naming system that was common in the pre-war era.

That older format matters because it does not read like later numeric or modern metric sizes. If your Stearns-Knight carries 32X6.75 markings, you should stay within that vintage sizing family unless you are intentionally converting the wheel and tire package. Owners pursuing factory-correct appearance usually pay close attention to this style of size marking because it affects both the stance and the authenticity of the finished car.

On a 1928 Stearns-Knight, 700-20 is a numeric bias-ply size. The 7.00 refers to nominal section width in inches, and the 20 identifies the wheel diameter in inches. That size appears across the 8H, 8J, and F6-85, and it is the one with currently listed product choices in Firestone and BFGoodrich lines.

For a buyer, 700-20 is usually the easier code to cross-check against actual wheels because the 20-inch rim diameter is stated plainly in the size. It also opens up visible styling choices, since blackwall, wide whitewall, and double-whitewall versions exist within that size. Once the wheel diameter is confirmed, the next step is choosing the sidewall look that best fits the character of your particular Stearns-Knight.

1928 Stearns-Knight tires in the listed 700-20 size are available in Blackwall, Wide Whitewall, and Double-Whitewall styles. Firestone offers both Wide Whitewall and Double-Whitewall versions, while BFGoodrich offers Wide Whitewall and Blackwall versions. All of them stay within a bias-ply, pre-war-appropriate visual character.

The practical choice comes down to how formal or understated you want the car to appear. A blackwall usually gives a more restrained look, while wider whitewall treatments emphasize the luxury presence that suits an upscale late-1920s automobile. For judged restorations, sidewall style can matter nearly as much as size, so it is worth checking period photos or club guidance for your body style and market presentation.

Firestone and BFGoodrich both make tires for 1928 Stearns-Knight vehicles in the listed 700-20 size. Firestone offerings appear in the Balloon series, while BFGoodrich offerings appear in the Silvertown Classic Bias Ply line. Both brands are long-established American names that fit naturally with the character of a domestic luxury car from 1928.

Brand selection on a pre-war car is often part appearance choice and part wheel-compatibility research. The available sidewall styles differ by brand, and the listed rim width ranges do as well, so a buyer should compare those details alongside the look they want. If one tire matches your wheel better and another matches your visual goal better, that is where model-specific restoration priorities usually guide the final decision.

For 1928 Stearns-Knight vehicles, the Firestone 700-20 tires listed here fit 20-inch rims with a 3.75 to 4.00 inch width range and appear in whitewall and double-whitewall styles, with a 1930-pound load rating at 40 psi. The BFGoodrich 700-20 tires fit 20-inch rims with a 5.00 to 5.50 inch width range and appear in wide whitewall and blackwall styles, with listed load ratings of 1980 pounds at 42 psi or 1700 pounds at 36 psi depending on the product.

Those differences matter because they affect both how the tire sits on the wheel and how the finished car presents visually. A Stearns-Knight owner should compare the actual wheel width first, then decide whether the desired look is a blackwall, a broad whitewall, or a double-whitewall treatment. Weight differences between the listed products are secondary to making sure the wheel and style choice line up properly.

1928 Stearns-Knight tires in the listed 700-20 size mount on 20-inch rims, but the acceptable rim width depends on the specific product. Firestone 700-20 tires are listed for 3.75 to 4.00 inch rims, while BFGoodrich 700-20 tires are listed for 5.00 to 5.50 inch rims. That is a meaningful spread, even within the same nominal tire size.

A buyer should measure the actual wheel before choosing between brands in 700-20. On a nearly century-old car, wheels may have been changed, widened, or substituted during earlier restorations, so assumptions can create expensive mistakes. Matching the tire to the real rim width is just as important as matching the sidewall style to the era.

A 1928 Stearns-Knight can use both listed tire sizes across the 8H, 8J, and F6-85, but the key question is whether the car's actual wheels are the ones intended for that size. The 700-20 options are clearly tied to 20-inch rims, while 32X6.75 belongs to an older diameter-by-section sizing system that should be matched carefully to the existing wheel setup on the car.

That makes wheel verification the first job before selecting a replacement tire. If your Stearns-Knight still has its original-style wheels, they may support the tire family the car was originally equipped with, but restored cars do not always remain unchanged. Comparing the tire marking on the car now, measuring the rim, and checking with a marque specialist is the safest path when two authentic pre-war sizes appear for the same model range.

A 1928 Stearns-Knight should be stored in a cool, dry, dark space away from direct sunlight, electric motors, welders, battery chargers, and other ozone-producing equipment. Bias-ply tires from this era's reproduction market can develop flat-spotting more readily during long periods of static storage, so maintaining proper inflation and moving the car slightly from time to time is helpful.

If the car will sit for months, many collectors either roll it periodically or support it in a way that reduces constant load on one patch of tread. Clean, dry floors are better than damp surfaces, and tire dressings meant for modern cosmetic shine are usually less important than simply keeping the rubber out of heat and ultraviolet exposure. Good storage habits preserve both appearance and road manners.

Tires on a 1928 Stearns-Knight are usually judged more by age and condition than by mileage. Collector-car owners often begin close inspection and professional evaluation once tires are around five to seven years old, and many consider replacement as they approach roughly ten years, even if the tread still looks usable. The DOT date code on the tire is the usual starting point for determining age.

That age-based approach matters because a low-mileage pre-war car may appear to have plenty of tread while the rubber itself has hardened or deteriorated. Storage conditions, inflation habits, and exposure to sunlight or ozone often have more effect than annual miles traveled. When in doubt, replacing an aged tire is usually a wiser preservation decision than trying to maximize service life on a seldom-driven luxury car.

Tires on a 1928 Stearns-Knight should be inspected before every drive, and they deserve an especially careful check before a tour, show trip, or any longer outing. Look for sidewall cracking, cuts, bulges, uneven wear, and any sign that the tire is losing pressure. The spare should be inspected too, since a period touring car is only as road-ready as the backup tire it carries.

On an older collector car, tire inspection is part of a broader readiness routine rather than an occasional maintenance item. A few quiet minutes in the garage can reveal issues that are easy to miss on a car driven infrequently. Keeping a simple log of tire age, pressure checks, and visual condition makes it easier to catch changes before they become roadside problems.

A 1928 Stearns-Knight 8H would have been a bias-ply car when new, because bias-ply construction was standard for American passenger cars in 1928. The size range associated with the 1928 Stearns-Knight lineup includes 32X6.75 and 700-20, both of which are era-correct bias-ply formats for the make and year. Original-equipment brand selection could vary, so size, construction, and sidewall treatment are usually the most reliable authenticity markers to confirm first.

For a truly exact restoration, buyers often compare surviving factory literature, period photography, and marque-club guidance before settling on a final tire specification. That is especially useful on luxury cars, where body style, export market, or delivery configuration may influence what looks most appropriate. Even when the broad answer is clear, the most exact concours standard often comes from Stearns-Knight specialists rather than from a generic fitment rule.

Correct tire fitment matters on a 1928 Stearns-Knight because judges and experienced enthusiasts notice size, construction type, and sidewall appearance very quickly on pre-war cars. A late-1920s American luxury car should present with an era-appropriate bias-ply look, and an obviously mismatched size or sidewall treatment can distract from otherwise careful restoration work. Tire details are part of the car's visual stance as much as its equipment list.

That does not mean every event uses the same judging standard. Some shows are more forgiving of practical touring choices, while strict concours settings may expect close adherence to period style. If your goal is high-level authenticity, it is worth checking event rules and speaking with marque-club members before finalizing the tire choice, especially when deciding between blackwall, wide whitewall, and double-whitewall presentations.

For a 1928 Stearns-Knight, the difference between whitewall and blackwall tires is primarily visual, though it carries real restoration significance. In the listed 700-20 fitments, BFGoodrich offers both blackwall and wide whitewall versions, while Firestone offers wide whitewall and double-whitewall versions. All remain bias-ply tires suited to the period, but they create very different appearances once mounted on a large pre-war luxury automobile.

A blackwall tends to look more restrained and mechanical, while a broad whitewall gives the car more presence and a more formal late-1920s luxury-car stance. Owners restoring a car to a particular body style, photo reference, or show standard often choose sidewall style as carefully as color or trim. If originality is the main goal, period imagery and club expertise are the best final check.

1928 Stearns-Knight tires can be suitable for road use when they are new enough, properly inflated, correctly matched to the wheel, and used within the limits of their construction and condition. The listed tires for this application are bias-ply designs, and no speed ratings are shown for the available 700-20 products. On a car of this age, overall mechanical condition often matters as much as tire capability at ordinary road speeds.

A pre-war luxury car should be driven with the understanding that its brakes, suspension geometry, steering feel, and chassis behavior belong to a different era from modern traffic. Smooth inputs, conservative speeds, and regular inspections are part of safe operation. If the plan includes frequent longer-distance use, the car's entire running condition should be evaluated rather than focusing on the tires alone.

Inflation pressure for 1928 Stearns-Knight tires depends on the exact tire you choose. Among the listed 700-20 products, Firestone versions carry a maximum load of 1930 pounds at 40 psi, while BFGoodrich versions are listed at either 1980 pounds at 42 psi or 1700 pounds at 36 psi, depending on the specific tire. Those figures are product ratings, not automatic vehicle settings.

The right approach is to use the vehicle manufacturer's recommendation when available as the baseline for the car, then make sure the selected tire is being used within its own rated pressure range. Pressure should never be transferred casually from one size or one brand to another just because the sidewall looks similar. On a heavy pre-war car, correct inflation is central to ride quality, wear, and steering behavior.

Before taking a 1928 Stearns-Knight on a longer drive, inspect every tire for cracks, cuts, bulges, tread separation, and pressure loss, and check the spare as carefully as the four on the ground. Confirm that valve stems are in good condition and that the tires match the wheel setup actually fitted to the car. A visual walk-around should also include looking for uneven wear that may hint at alignment or suspension issues.

Tire condition is only one part of preparing a car from 1928 for meaningful road use. A wise owner also checks wheel fasteners, brakes, steering play, fluid levels, cooling-system behavior, and basic ignition reliability before leaving home. When the tires are sound and the rest of the car is equally ready, a Stearns-Knight is far more enjoyable and much less likely to surprise you on the roadside.