1927 Davis Tire Fitment Guide

1927 Davis vehicles use four sizes across two model lines. The 1927 Davis 92 Series uses 30X5.77 and 30x5, while the 1927 Davis 94 Series uses 29X4.95 and 5.00-20. Those sizes are not shared across the full 1927 Davis range, so a buyer needs to know the model series before narrowing down the correct tire.

Wheel diameter also varies within the year. The 92 Series appears with both 20-inch and 25-inch fitments depending on size, while the 94 Series uses 20-inch fitments in both of its listed sizes. On a pre-war independent make like Davis, confirming the model badge, checking the existing wheel, and comparing the installed tire marking are all smart steps before moving on to product selection.

On a 1927 Davis, 30X5.77 is an antique diameter-by-section tire size. The first number gives the nominal overall tire diameter in inches, the second gives the approximate section width, and the size mounts on a 20-inch wheel. It is a bias-ply format associated here with the 1927 Davis 92 Series.

That older style of marking is different from later numeric tire sizes because it emphasizes outside diameter rather than listing wheel diameter directly in the code. If your 1927 Davis carries this marking, treat it as a specific 92 Series fitment rather than assuming another 30-inch tire will interchange. Antique-size cars often need the exact format and wheel pairing confirmed before any replacement decision is made.

For a 1927 Davis, 5.00-20 is a numeric bias-ply size. The 5.00 designates nominal section width in inches, and 20 is the wheel diameter in inches. Within the 1927 Davis range, this size is tied to the 94 Series rather than the 92 Series.

Numeric sizing became a more familiar way to express tire fitment as the industry moved away from some earlier diameter-by-section conventions. On a Davis 94 Series, that means 5.00-20 should be evaluated against the actual wheel and the car’s existing fitment, not substituted simply because another 20-inch tire is available. Matching the size code itself matters on a car from this era.

No, 1927 Davis models do not all use the same tire size. The 92 Series uses 30X5.77 and 30x5, while the 94 Series uses 29X4.95 and 5.00-20. Every listed size is model-specific rather than shared across both series.

That matters because a year-and-make search alone can point you to more than one correct-looking option. Before comparing tread appearance or restoration priorities, identify whether your car is a 92 Series or a 94 Series and confirm what is mounted on the wheels now. That simple step prevents crossing over between two similar-sounding but distinct pre-war fitment paths.

1927 Davis vehicles use both antique diameter-by-section markings and a numeric bias-ply marking, depending on model. Sizes such as 30X5.77, 30x5, and 29X4.95 describe nominal overall diameter first, while 5.00-20 lists nominal section width first and wheel diameter second. All four listed sizes are bias-ply constructions, so the main difference is sizing convention and model application rather than radial-versus-bias behavior.

For a buyer, that means the choice is less about modernizing the way the car drives and more about matching the correct historical size system to the right Davis series. Antique markings usually appeal to owners preserving an earlier pre-war look, while numeric sizing can reflect a later period expression on the proper model. The safest approach is to match your existing wheel and size code before deciding on appearance details.

A 1927 Davis owner should choose 29X4.95 or 5.00-20 according to the exact 94 Series fitment being matched, not as interchangeable options for the whole make. Both are bias-ply sizes associated with the 1927 Davis 94 Series, and both mount on 20-inch wheels, but they are expressed in different sizing systems and should be treated as separate fitments.

The practical decision comes down to what is already on the car, what wheel it carries, and whether the goal is to preserve an earlier style of tire marking or follow the numeric size associated with that model line. On a restoration-minded pre-war car, even small differences in size designation can matter visually and mechanically. Compare the sidewall marking on the existing tire or consult a Davis specialist before making the final call.

1927 Davis vehicles are associated here with the four listed sizes, all in bias-ply construction, but brand-specific product offerings are not shown at the year-and-make level. The key point for a Davis buyer is that the tire must first match the correct model series and size format before any brand comparison becomes useful.

That is especially true with low-production pre-war cars, where a brand name matters less than getting the right section width, diameter convention, and wheel fitment. Once the exact size is confirmed, brand choices can be narrowed by sidewall appearance and the kind of restoration standard you are aiming for. Starting with the proper Davis series keeps that brand comparison meaningful.

1927 Davis tires should first be matched by model and wheel diameter, because the listed sizes span more than one fitment path. The 92 Series includes a 20-inch fitment in 30X5.77 and a 25-inch fitment in 30x5, while the 94 Series uses 20-inch fitments in both 29X4.95 and 5.00-20. That wheel-diameter confirmation is the first setup check before moving deeper into wheel compatibility.

Pre-war wheels can vary in bead profile and condition, so the safest practice is to measure the wheel you actually have and compare it to the intended tire size before mounting anything. If your Davis has changed hands over the decades, do not assume the current wheels are original to the series. A correct-looking tire still needs to match the wheel it will actually live on.

A 1927 Davis normally falls into an era when tube-type service is common, especially with bias-ply tires on pre-war wheels, and all four listed sizes are bias-ply applications. Antique and early numeric tires used on cars of this age are typically paired with wheels and rims that were designed around tube-type practice rather than later tubeless conventions.

That makes wheel condition, flap use where applicable, and valve-stem integrity part of the overall fitting plan. Before final assembly, inspect the rim carefully for corrosion, sharp edges, or old repairs that could affect the tube inside. On a collector car that may sit for long periods, tube and valve-stem condition deserve as much attention as the tire casing itself.

A 1927 Davis should be stored in a cool, dry, dark space away from direct sunlight, electric motors, battery chargers, furnaces, and other ozone-producing equipment. Bias-ply tires are especially prone to flat-spotting and sidewall aging when a collector car sits in one position for long periods. Clean, stable flooring and consistent inflation help reduce stress during storage.

Moving the car periodically or supporting it in a way that avoids concentrating weight on one contact patch can help preserve tire shape. If the car will sit for a season, inspect the sidewalls before and after storage rather than assuming low mileage means low wear. A pre-war car like a Davis often spends more time parked than driven, so storage habits directly affect tire life.

Tires on a 1927 Davis should be judged more by age than by mileage. Collector-vehicle tires are commonly evaluated closely once they reach the five- to seven-year range, and many owners begin planning replacement around ten years regardless of remaining tread. That guideline matters even more on low-use bias-ply tires that may age out before they wear out.

Check the manufacturing date on the tire and watch for hardening, cracking, separations, or changes in how the car tracks and rides. A Davis that only appears at shows can still need tires sooner than expected because time, storage conditions, and heat cycles continue to work on the casing. Treat age as a maintenance item, not a cosmetic one.

Tires on a 1927 Davis should be inspected before every drive and again before any extended outing. Look for sidewall cracking, cuts, bulges, irregular wear, low pressure, and signs that the tire has shifted or settled after storage. On a pre-war car, it is also wise to include valve stems and the spare in that routine inspection.

A short local drive in a vintage Davis still places full trust in tires that may be decades newer than the car but far older than modern daily-driver tires. Frequent inspection catches age-related problems before they become roadside failures. Make tire checks part of the same ritual as checking fluids, wheel fasteners, and brake feel before taking the car out.

A 1927 Davis 92 Series belongs to a period when bias-ply tires were the standard construction for American passenger cars, and the listed 92 Series sizes are 30X5.77 and 30x5. Those are period-appropriate pre-war size expressions, with antique diameter-by-section markings that fit the era’s wheel and tire conventions. No original-equipment brand should be assumed from year and make alone.

For a restoration, the important first targets are matching the right series, the correct size marking, and an era-appropriate sidewall presentation. If your Davis has unusual provenance or regional history, a marque club, surviving factory literature, or period photos can help settle which of the two 92 Series sizes belongs on your particular car. That extra step is worthwhile on an uncommon independent make.

Correct tire fitment matters on a 1927 Davis because judges and knowledgeable enthusiasts typically notice size, construction type, and sidewall character on pre-war cars. A 92 Series wearing a 94 Series size, or a car wearing a later-looking size convention that does not match its proper application, can stand out quickly. Bias-ply construction is part of the expected visual and historical picture for a 1927 automobile.

Even outside formal judging, the right tire changes the stance and authenticity of a Davis in a way enthusiasts tend to appreciate. If your goal is concours-level presentation, verify the exact series and compare your tire marking against trusted period references. Event rules can vary, so local marque specialists and show organizers remain the best source for class-specific expectations.

The 1927 Davis 94 Series is associated with 29X4.95 and 5.00-20, both bias-ply sizes that fit the period. That aligns with what would be expected on a pre-war American car, since radial passenger-car tires were not part of normal original fitment in 1927. The presence of both an antique-style marking and a numeric marking means the exact car should be checked carefully before settling on one size.

For an owner restoring a 94 Series, authenticity comes from matching the tire to the specific wheel and historical fitment path rather than choosing whichever 20-inch size seems closest. Sidewall appearance and size code can influence how correct the finished car looks. If the car has been altered over time, period photos or club guidance can help confirm which 94 Series size belongs on it.

1927 Davis tires should be evaluated as bias-ply, pre-war collector-car tires first and foremost. Safe highway use depends on fresh condition, correct inflation, sound wheels, and proper installation, but the car’s own 1920s-era braking, steering, suspension, and overall road manners are often the bigger limiting factors at normal modern traffic speeds. Highway capability is never just a question of whether the tire fits.

A well-prepared Davis can certainly be driven, but it should be driven within the limits of both the tire design and the car itself. Plan for longer stopping distances, greater sensitivity to ruts and crosswinds, and more conservative cruising than you would expect from a later classic. Before any sustained road trip, make sure the tires, spare, and chassis are all ready for the same mission.

Inflation pressure for 1927 Davis tires should follow the factory guidance for the car when available and the tire maker’s recommendations for the exact size being used. The 1927 Davis range includes multiple model-specific sizes, including 30X5.77, 30x5, 29X4.95, and 5.00-20, so pressure should not be copied blindly from one fitment to another. Each size and wheel combination deserves to be treated on its own terms.

That matters because pressure affects ride quality, steering feel, casing flex, and tread wear on a lightweight pre-war car more than many owners expect. Start by matching the exact tire size to the vehicle, then confirm the pressure guidance for that specific product and application. If the car feels vague or harsh, use that as a prompt to recheck fitment and inflation rather than assuming one universal number is correct.

Before a longer drive in a 1927 Davis, inspect every tire for cracks, cuts, bulges, embedded debris, uneven wear, and proper inflation, then do the same for the spare. Pre-war wheels and tube-type service practices also make valve stems, rim condition, and secure mounting worth a close look. Tires are only one part of the preparation, but they are among the most visible warning points.

A longer outing is also the time to think beyond the tires themselves. Check wheel fasteners, brakes, steering play, fluid levels, and any age-sensitive rubber parts that support reliable road use. On a rare independent like a Davis, prevention matters more than improvisation because replacement parts and roadside help may not be easy to source once the trip has started.