1927 Auburn Tire Fitment Guide

1927 Auburn vehicles use six tire sizes across five model families: 29X5.25 and 5.25-19 for the 66 Series and 77 Series, 30X6.00 and 6.00-18 for the 66WW Series and 77WW Series, and 31X6.00 and 600-19 for the 88 Series. The 66 and 77 applications mount on 19-inch wheels, the 66WW and 77WW applications mount on 18-inch wheels, and the 88 Series returns to a 19-inch wheel with a larger overall tire package.

That spread means a 1927 Auburn owner should identify the exact series before choosing a tire. A 19-inch fitment on one Auburn model does not automatically make it correct for another, because the overall diameter and section width still differ. If your car has already been restored, compare the current tire markings and wheel diameter against the proper series fitment before selecting a replacement.

On a 1927 Auburn, 29X5.25 is an antique diameter-by-section size. The first number, 29, refers to the tire's approximate overall diameter in inches, while 5.25 refers to the nominal section width. That format belongs to the earlier way of expressing tire dimensions and is used on the 66 Series and 77 Series applications, both of which mount on 19-inch wheels.

Modern buyers often mistake the first number for wheel diameter, but in this format it is the tire's outside diameter, not the rim size. That matters when comparing 29X5.25 with 5.25-19, since both are tied to the same Auburn series family but describe the tire differently. If your goal is authenticity, make sure the marking style you choose matches the period look you want on the finished car.

On a 1927 Auburn, sizes such as 5.25-19 and 600-19 use the numeric bias-ply convention. The first number is the nominal section width in inches, while the second number is the rim diameter in inches. 5.25-19 applies to the 66 Series and 77 Series on 19-inch wheels, while 600-19 applies specifically to the 88 Series, also on a 19-inch wheel but with a larger tire package overall.

That shared 19-inch rim diameter is only part of the story. The 88 Series uses a different size family than the 66 and 77, so owners should not treat all 19-inch 1927 Auburn applications as interchangeable. Numeric sizes are often easier for present-day buyers to interpret, but the car still needs the correct width and overall stance for its series.

A visible sidewall-style option appears in the 1927 Auburn range for the 88 Series in 600-19, where a Lester Wide Whitewall is offered. Other 1927 Auburn sizes in this year-make range do not show the same level of sidewall variety here. For a late-1920s American luxury-leaning car such as an Auburn, whitewall presentation is often closely tied to the finished visual character of the restoration.

Sidewall style matters most when the car is being restored for era-correct appearance or judged presentation. A wider whitewall can dramatically change the look of an Auburn even when the size is correct, so buyers should think about whether they are matching a preserved original look, a concours target, or a more personalized period-style restoration. Event-specific standards are still worth confirming with Auburn club resources.

Within the currently represented 1927 Auburn fitments, Lester appears in 600-19 for the 88 Series. That gives 88 Series owners a named bias-ply option in a classic wide-whitewall presentation. Other listed 1927 Auburn sizes do not show additional brand variety here, so the visible brand coverage is centered on the 88 Series numeric 19-inch application.

Brand matters less than getting the right series-specific size, construction type, and sidewall presentation on a car of this age. Auburn owners usually start by identifying the exact model and wheel diameter, then narrowing the choice to the tire marking and visual style that best fits the car's restoration goals. Once those basics are settled, brand becomes part of the finishing decision rather than the first decision.

A 1927 Auburn can use either an antique diameter-by-section size or a numeric bias-ply size depending on the series: 29X5.25 and 5.25-19 for the 66 and 77, 30X6.00 and 6.00-18 for the 66WW and 77WW, and 31X6.00 and 600-19 for the 88. All of them are bias-ply constructions, so the real distinction is the size convention and the specific application tied to the model family rather than a bias-versus-radial choice.

Collectors often choose the marking style that best matches the era and appearance they want on the car, especially on pre-war automobiles where visual authenticity matters. Owners who are replacing an existing set should compare the tire sidewall markings already on the car, the wheel diameter, and any restoration records before changing size conventions. Keeping the tire family consistent with the model is more important than choosing the more familiar-looking code.

The 1927 Auburn range clearly separates by rim diameter, with 5.25-19, 29X5.25, 600-19, and 31X6.00 tied to 19-inch wheels and 6.00-18 and 30X6.00 tied to 18-inch wheels. A specific rim width range is not represented here for the Auburn applications themselves, so the safest approach is to verify the wheel actually on the car before mounting a replacement tire.

That check matters because many pre-war cars have had wheels swapped, restored, or reconditioned over the years. Even when the model is identified correctly, wheel condition and exact wheel dimensions still deserve a close look on a 1920s vehicle. If there is any doubt, measure the wheel and compare it with the intended tire application before finalizing the setup.

Original 1927 Auburn wheels can only be used with the tire sizes that match their rim diameter and series application. The 66 and 77 series use 19-inch wheel applications, the 66WW and 77WW use 18-inch wheel applications, and the 88 Series uses a different 19-inch size family from the 66 and 77. Rim diameter compatibility has to be correct before any other fitment question is addressed.

That means an original wheel from one 1927 Auburn series should not be assumed correct for another just because the year and make are the same. Owners should verify the wheel diameter on the car, then confirm the proper size family for that exact series. This is especially important on cars that have passed through multiple restorations, where mixed parts are common.

A stored 1927 Auburn should be kept in a cool, dry, dark space away from direct sunlight, electric motors, welders, battery chargers, and other ozone-producing equipment that can age rubber. Because every listed 1927 Auburn fitment here is bias-ply, the tires are more likely to develop temporary flat-spotting during long static periods than a modern radial. Clean floors, stable temperatures, and proper inflation all help preserve both the carcass and the sidewalls.

Collectors often improve storage outcomes by moving the car periodically or supporting it in a way that reduces long-term stress on one contact patch. If the car will sit for a season, inspect the sidewalls before the next drive and allow the tires to warm up gradually on the road. Good storage habits are especially important on a 1920s Auburn because the car may see low mileage but still experience age-related rubber deterioration.

Tires on a 1927 Auburn should be judged more by age and condition than by tread wear or mileage. On a collector car, a useful rule is to evaluate tires closely once they are around five to seven years old and to treat roughly ten years as a serious replacement threshold even if the tread still looks presentable. The DOT date code, if present on the tire, is the best starting point for establishing age.

Auburns often spend much of their life garaged, which can make old tires look deceptively healthy. Sidewall cracking, hardening, repeated loss of pressure, or vibration that grows worse with speed are all signs that age is catching up with the tire even on a lightly used car. For a pre-war automobile, replacing an aged tire before a touring event is usually wiser than trying to use up the last of its tread.

Tires on a 1927 Auburn should be inspected before every drive and again before any longer outing or tour. Look for sidewall cracking, cuts, tread separation, bulges, uneven wear, and any sign that the tire is no longer holding pressure consistently. On a car of this age, the inspection should also include valve stems and the condition of the spare, since those parts often age quietly between uses.

Pre-drive inspection matters because collector cars can sit for weeks or months and then be expected to run at road speed with little warning. Catching a failing valve stem, a split sidewall, or an emerging flat spot in the garage is much easier than dealing with it on the roadside. A brief routine walk-around is one of the simplest habits that improves reliability and preserves the car.

A 1927 Auburn 66 Series would have been fitted in period with bias-ply tires, as that was the standard construction for American passenger cars in the late 1920s. Within the 1927 Auburn range, the 66 Series is associated with 29X5.25 and 5.25-19 on 19-inch wheels. That gives restorers both an older diameter-based marking style and a numeric bias-ply expression tied to the same series family.

Owners pursuing originality should confirm which tire notation best matches their car's production timing, restoration target, and judging standard. Sidewall appearance, construction type, and the exact size family can all affect how authentic the finished car looks. For trim-specific or body-style-specific confirmation, Auburn club resources and period sales literature remain the best references before committing to a final show presentation.

Correct tire fitment matters a great deal when showing a 1927 Auburn because judges and knowledgeable enthusiasts notice whether the size family, construction style, and sidewall presentation fit the era and the model. A 66 or 77 wearing an 88 Series size, or a WW-series car wearing the wrong rim-diameter application, would stand out as incorrect even if the tire looked generally appropriate from a distance.

Show standards can vary, but pre-war judging usually rewards details that preserve the car's proper stance and period character. Tire markings, whitewall treatment, and whether the tire looks consistent with late-1920s American practice all influence the result. If the car is being prepared for a high-level event, confirm the expected tire presentation with the hosting organization or a marque specialist before the car is finalized.

The mixed size conventions seen on 1927 Auburn reflect the transitional language of the period rather than a modern performance upgrade path. Late-1920s American cars often appear with both antique diameter-by-section descriptions and numeric bias-ply descriptions, and Auburn's various series illustrate that overlap clearly. The 66 and 77 families, the WW-series cars, and the 88 Series each sit in their own tire-size grouping even though all remain bias-ply applications.

For restoration work, that means a tire code is part of the car's visual and historical character, not just a fitment number. Some owners prioritize the earlier-style marking because it looks more in step with the period, while others choose the numeric equivalent that matches the intended application. The best answer is usually the one that keeps the model, wheel diameter, and restoration objective aligned.

Properly selected and well-maintained 1927 Auburn tires can be suitable for road use within the normal expectations of a late-1920s automobile, but they are all bias-ply applications and should be treated accordingly. Bias-ply tires track and respond differently from modern radials, and the broader safety picture on a 1927 Auburn also includes braking performance, steering play, suspension condition, and the realities of pre-war road manners.

For highway use, the tire's age, inflation, and physical condition are just as important as the nominal size on the sidewall. A freshly inspected bias-ply tire on a sound Auburn is far more confidence-inspiring than an aged tire that merely looks acceptable in the garage. Drivers should bring the car up to speed gradually and remain realistic about how a 1927 chassis behaves in modern traffic.

Inflation pressure for a 1927 Auburn should be matched to the exact tire size on the car and then checked against the vehicle's original literature and the specific tire manufacturer's recommendations. The listed 1927 Auburn range includes several distinct size families across 18-inch and 19-inch applications, so one pressure figure should not be carried over from a 66 or 77 to a WW-series car or an 88 Series without verification.

Pressure has a direct effect on steering feel, ride quality, tread wear, and how the car sits on the road. Too little pressure can make a bias-ply car feel heavy and vague, while too much can produce a harsh ride and an incorrect contact patch. Set pressures when the tires are cold and recheck them before touring, especially if the car has been sitting.

Before taking a 1927 Auburn on a longer drive, inspect each tire for cracks, cuts, exposed fabric, bulges, uneven wear, and stable air pressure. Also check the spare, the valve stems, wheel security, and whether the tire sidewall markings still match the correct series application for the car. On a pre-war vehicle, tire condition is only one part of the preparation, but it is one of the easiest items to evaluate carefully in advance.

Longer drives place sustained heat and stress into old-chassis systems, so the tire inspection should be part of a broader look at brakes, steering, fluids, and cooling. If the Auburn has been parked for an extended period, give the tires extra attention during the first few miles for any vibration or pull. That early feedback often reveals issues before they become a real interruption on the road.