1926 Moon Tire Fitment Guide

1926 Moon vehicles in this range use two tire sizes: 30X5.25 and 5.25-20, and both are associated with the 1926 Moon A. Even though there is only one model here, the sizes are not interchangeable by name because they mount on different wheel diameters. The 30X5.25 size fits a 25-inch rim, while 5.25-20 fits a 20-inch rim, and both are bias-ply constructions appropriate to the period.

That means the first step is to confirm the actual wheel diameter on your 1926 Moon rather than assuming one size from the model name alone. Once the wheel size is confirmed, the correct tire choice becomes much clearer. If the car is under restoration and wheel history is uncertain, compare the fitted wheels carefully and consult a Moon specialist or marque community before moving ahead.

A 30X5.25 tire on a 1926 Moon uses an older antique sizing convention. The first number, 30, refers to the tire's overall diameter in inches, while 5.25 refers to the nominal section width. In practical terms, that size is an early-style bias-ply fitment intended for a 25-inch wheel rather than a modern metric or later alphanumeric format.

Owners often encounter this style of size on pre-war vehicles because tire markings evolved over time. If your Moon A carries this marking, it points you toward an antique-format replacement rather than a later numeric size that may look similar at first glance. Matching the format as well as the wheel diameter helps preserve the car's proper stance and keeps the fitment aligned with period practice.

A 5.25-20 tire on a 1926 Moon is a numeric bias-ply size. The 5.25 indicates the nominal section width in inches, and the 20 identifies the wheel diameter in inches. Unlike the older diameter-by-section format, this convention puts the wheel size directly in the code, which makes it easier to identify the required rim diameter at a glance.

That difference matters when a single 1926 Moon model appears with more than one size convention. A Moon A fitted for 5.25-20 needs a 20-inch wheel, so it should not be treated as interchangeable with 30X5.25 simply because both are bias-ply and era-correct. Checking the sidewall marking on the existing tire and measuring the wheel before replacing anything is the safest path.

The correct choice for a 1926 Moon depends on which wheel is on the car, not on a preference between constructions, because both available sizes are bias-ply. A 30X5.25 tire belongs on a 25-inch rim, while a 5.25-20 belongs on a 20-inch rim. Both suit the period, but they are tied to different wheel diameters and should be chosen by fitment rather than appearance alone.

If your Moon A has been restored before, changed hands multiple times, or has replacement wheels, confirm the wheel diameter before settling on a size. This is especially important on pre-war cars, where old and newer-style size markings can create confusion. Once you know the wheel, you can focus on the tire that preserves the right proportions and keeps the car visually faithful to its era.

1926 Moon tire choices in the sizes listed here center on specialty vintage tire offerings rather than mainstream modern passenger-car lines. The important distinction is less about broad brand competition and more about finding the correct period-size reproduction in the proper bias-ply construction for either 30X5.25 or 5.25-20. On a car of this age, size accuracy and construction style matter more than chasing a modern equivalent.

That makes it worthwhile to start with the exact size and wheel diameter your Moon A uses before narrowing by maker. Once the fitment is established, compare the available vintage-style products within that size for the look and use case you want. Owners pursuing show presentation may prioritize a traditional appearance, while regular hobby driving still begins with the same core requirement: the correct pre-war size.

Sidewall style is one of the details that can strongly affect how a 1926 Moon presents, especially on a pre-war American car where tire appearance is a visible part of the restoration. Depending on the product chosen within the correct size, the visual impression can range from a more understated blackwall-style look to a more formal vintage presentation. The right style should match the way you want the car judged, displayed, or driven.

For owners aiming at historical authenticity, sidewall appearance should be treated with the same care as size and construction. A sidewall that looks out of period can stand out even when the tire technically fits the wheel. Before choosing, compare the available styles in your Moon's correct size and think about whether the car is being restored for touring, local show use, or a more exacting originality standard.

1926 Moon tires in these pre-war sizes should be approached with the expectation that tube use may be part of the correct setup, especially when dealing with original-style wheels and period-correct bias-ply construction. Cars from this era were commonly built around tube-type practice rather than modern tubeless passenger-car conventions. The exact requirement should be confirmed against the specific tire and the wheel you are using.

That check matters because wheel design is just as important as the tire itself on a 1926 Moon A. If the car still uses original or original-style rims, tube compatibility, flap needs, and valve-stem condition all deserve attention during installation. Confirm the specific tire's sidewall marking and inspect the wheel carefully so the complete assembly matches the needs of an older collector car, not a modern passenger vehicle.

Original 1926 Moon wheels cannot be assumed to accept both listed tire sizes because the two sizes use different rim diameters. The 30X5.25 size mounts on a 25-inch wheel, while 5.25-20 mounts on a 20-inch wheel. That means wheel diameter alone separates the fitment before any other consideration enters the picture.

If your Moon A still has its original wheels, identify which diameter is actually fitted before choosing tires. If the car has had wheels changed over the decades, take direct measurements rather than relying only on old paperwork or memory. Once the wheel diameter is verified, you can move ahead with the matching size and then handle the finer details of setup, appearance, and restoration goals.

A stored 1926 Moon should be kept in a cool, dry, dark space away from direct sunlight, electric motors, welders, furnaces, and other ozone-producing equipment that can age rubber prematurely. Because both listed 1926 Moon sizes are bias-ply, they are more prone to temporary flat-spotting during long static periods than a modern radial would be. Clean, dry floors and stable temperature conditions also help protect both the tires and the wheels.

Moving the car periodically or slightly changing the tire contact patch during storage helps reduce set-in flat spots. If the Moon will sit for an extended period, many collectors use stands or reduce continuous load on the tires while still supporting the car correctly. Good storage habits preserve appearance as well as service life, which matters just as much on a pre-war collector car as outright mileage.

Tires on a 1926 Moon are usually judged more by age, storage conditions, and inspection results than by mileage alone. On collector vehicles, many owners begin evaluating tires closely once they are around five to seven years old and treat about ten years as a serious replacement point regardless of remaining tread. The DOT date code, overall rubber condition, and how the car has been stored all matter more than odometer use.

A lightly driven Moon A can still need new tires if the sidewalls have hardened, cracked, or lost flexibility with age. That is especially true for older-style bias-ply tires on a car that spends long stretches parked between outings. When in doubt, let age and condition guide the decision rather than tread depth alone, since collector tires often age out well before they wear out.

Tires on a 1926 Moon should be inspected before every drive and again before any longer outing. Look for sidewall cracking, cuts, bulges, irregular wear, low pressure, and any signs that the tire is no longer seated or behaving evenly on the wheel. On a pre-war car, it is also wise to pay close attention to valve stems and any tube-related hardware during routine checks.

Frequent inspection matters because older collector cars are often driven less, which can allow age-related issues to develop quietly between uses. A short local drive can become a much bigger problem if a weak sidewall or aged valve component goes unnoticed. Building tire checks into your normal pre-drive walkaround is one of the simplest and most valuable habits for keeping a 1926 Moon road-ready.

A 1926 Moon A would originally have been equipped with bias-ply tires, since that was standard practice in the American market during the mid-1920s. The listed 1926 Moon sizes, 30X5.25 and 5.25-20, both reflect period-appropriate bias-ply fitments rather than later radial conversions. Original-equipment branding could vary by market, dealer, and period supply, so the main historical constant is the construction type and correct size family.

For a restoration, that means the best starting point is to confirm which wheel diameter your Moon A actually carries and then stay with the proper bias-ply size for that setup. If you are preparing the car for a judged event, compare your tire selection against factory literature, surviving photos, and Moon marque resources. Club experts can often help sort out wheel and trim-period details that go beyond basic size identification.

Correct tire fitment matters a great deal when showing a 1926 Moon because judges and knowledgeable enthusiasts often notice size, construction, and sidewall appearance immediately. On a pre-war car, a tire that uses the wrong size convention, sits on the wrong wheel diameter, or carries an obviously out-of-period look can distract from an otherwise careful restoration. Bias-ply construction is part of that authentic presentation for a 1926 Moon.

That does not mean every show applies the same standards, but it does mean tire choice should be treated as part of the restoration plan rather than an afterthought. If your goal is concours-level authenticity, verify the correct size for your car and compare sidewall style closely to period expectations. Marque clubs and event rule books remain the best reference for what a specific judging field will reward or question.

Antique-format and numeric tires for the 1926 Moon differ mainly in how the size is expressed and which wheel diameter they fit. The 30X5.25 tire uses an older system that states overall diameter and section width, while 5.25-20 states nominal width and wheel diameter directly. Both are bias-ply and both are period-appropriate, but they are not simply two ways of writing the same fitment.

That distinction matters in restoration work because pre-war cars sometimes pass through decades of wheel changes, replacement parts, or mixed records. A restorer who reads the size correctly can avoid ordering a tire that looks plausible on paper but fits the wrong rim. For a 1926 Moon A, understanding the format is part of preserving the car's proper stance, visual balance, and historical character.

A properly fitted and well-maintained set of 1926 Moon tires can be suitable for normal hobby driving, but safety on the road depends on far more than the tire alone. Both listed 1926 Moon sizes are bias-ply, so they will deliver period-correct road manners rather than the feel of a modern radial. On a car from 1926, braking capability, steering condition, suspension wear, and overall mechanical health often shape highway confidence as much as the tires do.

For that reason, longer or faster trips should be approached with realistic expectations about the car's age and design. Bias-ply tires can track and respond differently than modern drivers expect, especially on uneven pavement. A careful pre-drive inspection, appropriate speeds for the vehicle, and a sound mechanical baseline do more for safe touring in a 1926 Moon than simply focusing on tire age or tread alone.

Inflation pressure for 1926 Moon tires should be matched to the exact tire size, the tire maker's stated limits, and the vehicle guidance for the wheel and use case. The two listed sizes are not the same fitment, so pressure should never be transferred casually from 30X5.25 to 5.25-20 or the other way around. On a collector car, the correct pressure is part of both safe operation and proper tire shape on the wheel.

Start with the guidance supplied for the specific reproduction tire you are using, then compare that with original Moon literature or trusted marque references if available. Pressure that is too low can affect stability, while pressure that is too high can make an older car ride harshly and wear incorrectly. Treat inflation as a size-specific setup choice, not a one-number rule for every 1926 Moon.

Before a longer drive in a 1926 Moon, inspect each tire for sidewall cracking, cuts, bulges, abnormal wear, and steady air retention. Check the valve stems, confirm the spare is usable, and make sure the tire size on the car matches the wheel actually fitted. Because these are bias-ply applications on a very early vehicle, the condition of the complete tire-and-wheel assembly deserves close attention before leaving home.

That tire inspection should be part of a broader pre-drive check that includes brakes, steering play, wheel bearings, fluid levels, and basic fuel-system readiness. A 1926 car can turn a small oversight into a bigger roadside interruption much faster than a newer vehicle can. Giving the tires equal attention with the rest of the chassis helps the trip feel more predictable and protects the work already invested in the car.