1926 Auburn Tire Fitment Guide

1926 Auburn vehicles use four tire sizes across three model lines: 30X5.25 and 5.25-20 for the 1926 Auburn 44 Series and 66 Series, plus 30X5.77 and 30x5 for the 1926 Auburn 88 Series. All four are bias-ply fitments. The listed rim diameters are 23 inches for 30X5.25, 20 inches for 5.25-20, 24 inches for 30X5.77, and 25 inches for 30x5.

That means there is no one-size-fits-all tire for every 1926 Auburn. Start by identifying whether you have a 44 Series, 66 Series, or 88 Series, then verify the actual wheel diameter on the car before choosing a tire. On nearly century-old cars, wheels may have been changed over time, so the mounted wheel should always be checked against the intended size.

On a 1926 Auburn, 30X5.25 is an antique diameter-by-section size. The first number, 30, refers to the tire’s overall diameter in inches, while 5.25 refers to the approximate section width. It is a bias-ply construction, and on 1926 Auburn applications it is used on the 44 Series and 66 Series, mounting on a 23-inch rim.

That format differs from later tire sizing systems that center the code around wheel diameter first. If your Auburn carries a diameter-by-section marking like 30X5.25, stay within that fitment family unless you have already confirmed a different wheel and tire setup on the car. Matching the correct size family helps preserve proper stance, appearance, and compatibility with the wheel you actually have.

No, 1926 Auburn models do not all use the same tire size. The 44 Series and 66 Series share 30X5.25 and 5.25-20, while the 88 Series uses 30X5.77 and 30x5. Every listed option is a bias-ply tire, but the model families are separated by size and rim diameter.

That distinction matters because a 1926 Auburn owner cannot choose by year and make alone. The 88 Series is in a different fitment group from the 44 and 66 Series, so confirming the series designation is essential before moving on to product selection. If the car has been restored or re-bodied over time, compare the series identification with the actual wheel size on the vehicle.

For a 1926 Auburn 44 Series or 66 Series, the choice between 30X5.25 and 5.25-20 is not a bias-ply-versus-radial decision because both are bias-ply sizes. The real difference is the size system and wheel diameter: 30X5.25 is an antique diameter-by-section fitment on a 23-inch rim, while 5.25-20 is a numeric bias-ply fitment on a 20-inch rim.

Choose the size that matches the wheels on your car and the fitment approach you are preserving. If the Auburn still carries its established restoration setup, staying with that size usually keeps the visual proportions and wheel compatibility aligned. When there is any doubt, confirm the actual rim diameter before ordering rather than assuming the two sizes interchange.

The 1926 Auburn fitment guide covers four vintage bias-ply size families, but brand selection depends on the exact size tied to your series and wheel. Auburn owners typically shop within specialty vintage tire lines that reproduce early sizing systems rather than modern passenger-car fitments. The key is matching the correct Auburn series and wheel diameter first, then narrowing to the available vintage product line in that size.

That approach is especially important on pre-war cars because the size code itself often tells you more than a modern buyer expects. Once the series and wheel size are confirmed, compare available vintage brands within that specific size for sidewall appearance and intended use. A 44 Series or 66 Series owner should not shop from the same size pool as an 88 Series owner without first verifying fitment.

Sidewall style matters on a 1926 Auburn because the car’s pre-war look is strongly influenced by tire appearance as much as tire size. Depending on the exact size and product line selected, vintage tires for cars of this era may be offered in styles that emphasize a more formal, restoration-oriented presentation rather than a later post-war look. The right style should align with the series, the restoration theme, and the way the car will be presented.

For a serious restoration or judged car, sidewall appearance should be chosen as carefully as the size itself. Owners building a period-faithful Auburn often use sidewall styling to reinforce the car’s late-1920s character, while a touring-oriented owner may simply want a vintage look that suits the car visually. Once the correct Auburn size is established, sidewall style becomes the next meaningful choice.

1926 Auburn vehicles use several different size families, but the most clearly defined wheel requirement at the year-make level is rim diameter rather than a universal rim width. The listed sizes mount on 23-inch, 20-inch, 24-inch, or 25-inch rims depending on the Auburn series and tire selected. That means wheel diameter must be confirmed before any further fitment decision is made.

On a car from 1926, the safest approach is to inspect the actual wheels and match them to the intended tire size rather than relying on memory or a prior owner’s notes. If your Auburn has already been restored, compare the wheel to the tire size currently fitted and to the series it belongs to. For final setup details, a marque specialist or experienced vintage tire installer can help verify the wheel and tire combination.

A 1926 Auburn sits in an era where tube-type service is commonly associated with vintage wheel and tire setups, especially with pre-war bias-ply fitments such as 30X5.25, 5.25-20, 30X5.77, and 30x5. Tube use should be confirmed against the exact tire selected and the wheel construction on the car. Early clincher and demountable-style wheel arrangements especially deserve careful inspection before assembly.

The practical takeaway is to treat the tube question as part of the full wheel-and-tire setup, not as a separate afterthought. When you confirm the Auburn’s wheel style, inspect the condition of the rim, valve area, and any flap or tube requirements at the same time. That keeps the installation consistent with the needs of a pre-war car and reduces surprises during mounting.

A 1926 Auburn should be stored in a cool, dry, dark space away from direct sunlight, electric motors, furnaces, welders, and other ozone-producing equipment that can accelerate rubber aging. Because 1926 Auburn fitments are bias-ply tires, long static storage can also encourage temporary flat-spotting. Clean floors, stable temperature, and protection from standing moisture all help preserve both the tire casing and the wheels.

Move the car periodically if possible, or slightly change the tire contact patch during long storage intervals. Some owners also use stands to reduce sustained load during extended layups, though the suspension should be supported correctly if that route is taken. Proper inflation before storage and a quick pressure check before rolling the car again are simple habits that pay off on an early collector automobile.

On a 1926 Auburn, tire age usually matters more than tread wear because collector cars often see limited mileage. A sensible rule is to begin close inspection and evaluation once tires reach roughly five to seven years of age, with replacement strongly considered as they approach around ten years, regardless of remaining tread. The tire’s date code and its real-world storage history both matter.

An older Auburn may spend most of its life indoors, but age-related hardening, cracking, and internal deterioration can still progress quietly. That is why a lightly driven car should not be judged by tread depth alone. If the tires have unknown age or the car has been inactive for a long period, a careful inspection before regular road use is a wise step.

Tires on a 1926 Auburn should be inspected before every drive, and they deserve a more thorough check before any longer outing. Look for sidewall cracking, cuts, bulges, irregular wear, looseness at the valve area, and signs that the tire is losing pressure between uses. On a pre-war setup, the spare should be checked with the same care as the road tires.

Frequent inspection matters because an Auburn of this age can sit for long periods and then be asked to run on roads very different from those it was built for. If your setup uses tubes, pay extra attention to valve stems and any evidence of slow leakage. A few minutes of inspection before departure is far easier than dealing with a preventable roadside problem in a vintage car.

The 1926 Auburn 44 Series belongs to a pre-war period when bias-ply construction was the standard tire type, and its listed Auburn fitments are 30X5.25 and 5.25-20. That means a restoration-minded owner should be looking within vintage bias-ply size families that match the wheels and the specific series. Original-equipment branding could vary by market and period supply, so size and construction are usually the first authenticity markers to confirm.

For a historically faithful restoration, start with the correct 44 Series size and a bias-ply construction that visually suits a mid-1920s automobile. If you are preparing the car for judged events, consult Auburn marque clubs or period literature for series-specific guidance on acceptable fitment details. That extra step can help you sort out whether your car should remain with its current size family or return to another correct period option.

Correct tire fitment absolutely matters when a 1926 Auburn is judged or presented seriously. On a pre-war car, judges and knowledgeable enthusiasts often look at whether the size family, construction type, and overall sidewall presentation suit the era and the specific model. A tire that is visibly from the wrong sizing system or the wrong visual period can stand out quickly, even if it physically fits the wheel.

That is why a show-oriented Auburn owner should treat tires as part of the restoration, not just a maintenance item. The 44 Series, 66 Series, and 88 Series do not all share one size, so correct model identification is part of authenticity. Event standards can differ, so marque clubs and event rulebooks remain the best way to confirm what is acceptable for a specific class.

On 1926 Auburn vehicles, antique and numeric tire sizes describe the tire in different ways even though both belong to the same broad pre-war bias-ply world. An antique size such as 30X5.25 or 30x5 starts with overall tire diameter and then section width, while a numeric size such as 5.25-20 centers the code on section width and wheel diameter. Both appear in the 1926 Auburn range, depending on the series.

That distinction matters for restoration because the size code itself affects what looks correct on the car. A 44 Series or 66 Series owner may be comparing an antique-marked size with a numeric-marked size, while the 88 Series stays within antique-style markings. When authenticity is the goal, keep the correct size family tied to the proper series and wheel rather than assuming one old-style code is interchangeable with another.

A 1926 Auburn can be driven on modern roads when its tires are in good condition, correctly fitted, and properly inflated, but every listed fitment for the year is a pre-war bias-ply size. Bias-ply tires have different road manners from modern radials, including more sensitivity to grooves, crown, and steering input. On a car of this age, the overall condition of the wheels, suspension, brakes, and steering is often just as important as the tire itself.

Highway use should be approached with the expectations appropriate to a 1926 automobile, not a modern car. Before any sustained road speed, confirm that the tires are age-appropriate, evenly inflated, free from visible defects, and matched to the correct Auburn series and wheel. A conservative driving style and a full mechanical inspection are part of safe operation on any vintage Auburn.

Inflation pressure for a 1926 Auburn should follow the vehicle’s original factory guidance when available, while also staying within the tire manufacturer’s limits for the exact vintage size you are using. Because 1926 Auburn vehicles do not all use the same tire size, pressure should never be transferred casually from 30X5.25 to 5.25-20 or from a 44 Series setup to an 88 Series setup. The correct pressure is tied to the exact size, wheel, and intended use.

The practical way to handle pressure is to verify the Auburn series and tire size first, then consult the vehicle literature and the tire’s own rated information together. That helps preserve ride quality, steering behavior, and tire life on an early car. If the car carries restored or replacement wheels, a vintage tire specialist can help you reconcile historical guidance with the tire currently fitted.

Before a longer drive in a 1926 Auburn, inspect each tire for cracks, cuts, bulges, uneven wear, and proper inflation, and check that the spare is usable as well. Pay close attention to valve stems and to any signs of air loss after the car has been parked. Since 1926 Auburn fitments are bias-ply sizes used on a pre-war chassis, the tires should be considered as one part of a broader readiness check.

That broader check should include wheel security, brake operation, steering play, and general fluid and cooling-system condition before heading out. Vintage cars often reveal storage-related issues only after the first few miles, so a short local test drive before a longer trip is a smart precaution. Good tires help, but dependable touring in an Auburn always depends on the whole car being prepared.