1930 Marquette Tire Fitment Guide

1930 Marquette vehicles use two tire sizes: 28X5.25 and 5.25-18. Both apply to the 1930 Marquette 6 Cyl., and both are bias-ply sizes mounted on 18-inch wheels. That means the year and make do not split into different model-specific tire families, but the car can still be encountered with either size depending on its wheel and fitment setup.

The practical step is to verify the size already fitted to your car and confirm the wheel before choosing a replacement. Since both sizes belong to the same model, the question is not which body style you own, but which tire convention your particular Marquette is set up to use. On an uncommon pre-war car, that extra check helps avoid ordering a tire that matches the year but not the actual wheel on the vehicle.

On a 1930 Marquette, 28X5.25 is an antique diameter-by-section size. The 28 refers to the tire's overall diameter, while 5.25 refers to its nominal section width. Unlike later modern sizing, the first number is not the wheel diameter. This format belongs to the early era of tire sizing and appears in bias-ply construction for the Marquette 6 Cyl.

That older code matters because it can be confused with later numeric or metric tire markings if you are used to modern vehicles. When a Marquette is fitted for 28X5.25, you should replace it with the same size convention rather than assuming another 18-inch tire is automatically interchangeable. Matching the correct size format preserves proper proportions and helps keep the car visually and mechanically in character with its pre-war design.

On a 1930 Marquette, 5.25-18 is a numeric bias-ply size. The 5.25 refers to the nominal section width in inches, and the 18 refers to the wheel diameter in inches. This is a later and more familiar pre-war size convention than the antique diameter-by-section format, but it is still an era-correct bias-ply style rather than a modern radial code.

That difference is important when reading sidewalls or comparing old tire references during a restoration. A Marquette set up for 5.25-18 should stay with that size unless you have already confirmed a wheel change or another approved fitment path. Treat the marking on the tire and the wheel itself as your first guide, especially on a nearly century-old car that may have seen parts changes during its life.

For a 1930 Marquette, both 28X5.25 and 5.25-18 are bias-ply sizes used on the 6 Cyl., so the choice is not a bias-versus-radial decision. The real issue is which size your car and wheels are already set up to use. Even though both fit 18-inch wheels, the size codes describe different tire conventions and should not be treated as interchangeable without checking the actual wheel and current fitment.

Owners aiming for accurate pre-war presentation often follow the size already associated with their car's restoration history, wheel setup, and judging goals. Drivers focused on getting the car back on the road still need to start from fitment rather than preference, since construction is the same in both cases. If your Marquette has changed hands or been restored long ago, compare the existing tire marking and wheel before making the final decision.

Only the two correct sizes for 1930 Marquette matter first: 28X5.25 and 5.25-18, both in bias-ply construction for the 6 Cyl. Once the correct size is established, brand choice follows the products available in that individual size. On a pre-war American car like a Marquette, buyers usually begin by narrowing the search to proper period-style reproduction tires rather than starting with brand name alone.

That approach keeps the selection process focused on fitment, appearance, and era correctness instead of treating all old-car tires as interchangeable. If you are comparing brands within the same Marquette size, look at sidewall appearance and the intended use of the car, whether that is preservation, judged restoration, or regular collector driving. The right brand decision comes after the size is settled, not before.

Sidewall style matters on a 1930 Marquette because it changes the visual character of an otherwise correctly sized pre-war tire. On cars from this era, sidewall treatment is often one of the first details noticed in a restoration, even when the tire remains the right size and bias-ply construction. A Marquette prepared for formal judging may be evaluated differently than one meant primarily for touring and local events.

That makes it worth deciding early whether your goal is strict authenticity or a presentation that simply looks at home on the car. If your Marquette already has an established restoration theme, match the replacement tire's sidewall style to that direction rather than mixing eras or visual cues. On a low-production make, consistent presentation can be just as important as the size itself when the car is viewed as a whole.

Original 1930 Marquette wheels can potentially be used with both listed tire sizes because both 28X5.25 and 5.25-18 mount on 18-inch rims. That establishes basic diameter compatibility, but it does not automatically make the two sizes interchangeable on every wheel. Wheel condition, rim profile, and width still need to match the tire being installed, especially on a pre-war car that may retain very old original components.

The safest approach is to inspect the wheel before mounting any new tire and verify that its dimensions and condition are suitable for the specific size you intend to run. If your Marquette has been restored over many decades, do not assume every 18-inch wheel on the car is original or matched. A wheel-by-wheel inspection is worthwhile before fitting fresh tires to a collector car of this age.

1930 Marquette tires use 18-inch rims in both listed sizes, but the exact rim width should be confirmed against the specific tire you plan to install and the wheel actually on the car. Early wheels can vary in profile and may have been repaired, replaced, or mixed over time. Since both 28X5.25 and 5.25-18 are pre-war bias-ply sizes, proper rim support is part of getting the intended shape and fit.

A careful measurement of the wheel is the best starting point before mounting new tires. That is especially important if the car has sat for years, has old restoration work, or came with spare wheels from another source. On an uncommon make like Marquette, confirming the wheel dimensions first can save time and help avoid forcing a tire onto a rim that is the right diameter but the wrong overall fit.

A 1930 Marquette should be stored in a cool, dry, dark space away from direct sunlight, electric motors, welders, battery chargers, and other ozone sources that age rubber. Bias-ply tires are more prone to flat-spotting during long static periods than later radial designs, so the car should be moved periodically or supported in a way that reduces constant load on one contact patch. Clean, dry floors and stable temperature also help preserve the tire casing and sidewalls.

Owners who store a Marquette for months at a time usually benefit from checking inflation regularly and rolling the car enough to change the loaded section of the tire. If the car will remain parked for a season, keep the tires out of standing moisture and avoid covering them with materials that trap heat. Good storage habits are especially valuable on pre-war bias-ply tires because collector use patterns often age them more by time than by miles.

Tires on a 1930 Marquette are usually evaluated by age before they are judged by mileage. On collector vehicles that see occasional use, many owners begin inspecting more critically once tires reach roughly five to seven years of age and give serious replacement consideration as they approach ten years, depending on storage, visible condition, and service history. The DOT date code, along with sidewall and tread condition, is a practical guide when assessing remaining service life.

That age-based approach matters because a lightly driven Marquette can still wear old rubber that looks decent at a glance but has hardened internally. A tire that holds air and still shows tread is not automatically a good candidate for continued road use. Checking age alongside cracking, distortion, and general casing condition helps you make a better decision for a low-mileage pre-war car than relying on tread depth alone.

Tires on a 1930 Marquette should be inspected before every drive and again before any longer outing. Look for sidewall cracking, cuts, bulges, unusual tread wear, and signs that the tire has lost pressure while parked. Because a pre-war collector car may sit for long intervals, problems can develop quietly between drives even when mileage is very low.

A more thorough seasonal inspection is wise if the Marquette is driven only occasionally. Include the spare, the valve stems, and the wheel itself, since corrosion or damage at the rim can affect how well an older-style tire performs once back on the road. Frequent visual checks take only a few minutes and are one of the simplest ways to reduce surprises on a car that may spend most of its life in storage.

A 1930 Marquette 6 Cyl. would have been fitted in the bias-ply era, and the sizes associated with the model are 28X5.25 and 5.25-18. Both are appropriate pre-war tire conventions for the period. Original-equipment branding could vary by market, supplier arrangement, or restoration history, so the most reliable starting point is the size and construction type rather than assuming a specific brand name.

For a restoration intended to be highly accurate, confirm the tire style against period literature, surviving photos, and marque-club knowledge for your specific car. That is especially useful on a short-lived make like Marquette, where details can be less familiar than on larger-volume GM divisions. Starting with the correct bias-ply construction and the right size family gets the restoration pointed in the proper direction.

Correct tire fitment does matter when showing a 1930 Marquette, especially in events that evaluate authenticity. Judges and knowledgeable enthusiasts often notice whether the size, construction type, and overall sidewall presentation suit the era of the car. On a 1930 automobile, a visibly modern-looking tire or an obviously mismatched size can stand out even to casual observers, and it can affect the car's visual balance as much as its judged correctness.

That does not mean every event applies the same standard, but it does mean tire choice should be made with your end goal in mind. If the Marquette is being restored for formal competition, marque experts and event rulebooks are the best place to confirm what will be accepted. If the car is meant for touring and local shows, you still benefit from selecting a size and appearance that look at home on a 1930 American car.

1930 Marquette tires use older codes because the car predates the metric and alphanumeric systems that became common later in the automotive industry. The Marquette's two listed sizes, 28X5.25 and 5.25-18, come from pre-war sizing conventions that described tires by overall diameter and section width or by nominal width and wheel diameter. Those markings are a normal part of period tire identification, not a sign that the tire is unusual by 1930 standards.

Recognizing that helps prevent modern cross-reading mistakes when ordering replacement tires. A buyer accustomed to P-metric radials might assume the code should always end in the wheel diameter or include an aspect ratio, but pre-war tires often do not work that way. Learning the older format is one of the simplest ways to keep a Marquette restoration accurate and avoid selecting a tire that belongs to a much later automotive era.

1930 Marquette tires can be suitable for road use when they are the correct size, in sound condition, properly mounted, and used within the limits of their construction. Both listed Marquette sizes are bias-ply designs, which deliver an authentic pre-war driving feel but behave differently from modern radials in tracking, steering response, and ride character. On a car from 1930, overall mechanical condition often matters just as much as the tire when considering sustained highway use.

That means the question is larger than tire age or tread alone. Before planning regular highway travel, inspect the entire car with the same care you give the tires, including brakes, steering, wheel bearings, and suspension. A sound Marquette on fresh, correctly fitted tires can be enjoyable on the road, but it should still be driven with the expectations appropriate to a pre-war automobile rather than compared directly to a modern car.

Inflation pressure for 1930 Marquette tires should follow the guidance for the exact tire size and product you are using, together with the vehicle's original recommendations where available. Since the Marquette uses two different pre-war sizes, pressure should not be transferred casually from one size to the other. The correct setting depends on the specific tire's construction and the wheel-and-vehicle combination it is supporting.

Start by identifying whether your car is fitted with 28X5.25 or 5.25-18, then verify the manufacturer's recommended operating range for that tire and compare it with period vehicle guidance. That approach is better than relying on old shop lore or whatever pressure happened to be in the tires when the car was acquired. Correct inflation affects ride, handling feel, casing shape, and long-term durability on a pre-war collector vehicle.

Before taking a 1930 Marquette on a longer drive, inspect each tire for cracking, cuts, bulges, uneven wear, and proper inflation, and make sure the spare is serviceable as well. Look closely at valve stems and wheel condition, since age-related issues can appear there even when the tread looks usable. Because the Marquette is a pre-war car, tire inspection should be part of a broader mechanical review rather than a stand-alone check.

A sensible pre-drive routine also includes verifying steering feel, brake response, fluid levels, and the condition of any tools needed for a roadside wheel or tire issue. Long drives place sustained heat and load into components that may not see frequent use on a collector car. Giving the Marquette a thorough walkaround before departure helps you catch small age-related issues while they are still simple to address.