1930 Auburn Tire Fitment Guide

1930 Auburn vehicles use eight sizes across four model lines, and each series has its own pair. The 85 Series uses 28X5.50 and 550-18, the 95 Series uses 30X6.00 and 6.00-18, the 125 Series uses 30X6.50 and 650-18, and the 125WW Series uses 30X6.75 and 700-18. All listed replacement products for the currently available numeric sizes mount on 18-inch rims, with rim-width ranges varying by size: 550-18 appears from 3.00 to 4.00 inches, 650-18 from 3.25 to 3.50 inches, and 700-18 from 3.75 to 4.00 inches.

That means a 1930 Auburn owner should identify the exact series before doing anything else, because the make did not use one universal tire size in 1930. The antique sizes help confirm original-era fitment language, while the numeric 18-inch sizes are the more practical replacement references when products are available. If your car still wears original-style wheels, confirm both the rim diameter and usable rim width before settling on a final tire choice.

On a 1930 Auburn, 30X6.50 is an antique diameter-by-section size. The first number, 30, refers to the tire's approximate overall diameter in inches, while 6.50 refers to its nominal section width. In the 1930 Auburn range, that specific size belongs to the 125 Series and represents a bias-ply tire from the period when many American cars still used this earlier sizing convention.

The practical takeaway is that 30X6.50 is best read as an original fitment language marker rather than a modern dimensional formula. Owners often encounter both the antique code and a numeric 18-inch replacement size when researching these cars, so seeing 30X6.50 on a 125 Series helps confirm you are looking at the right family of fitments. It is a useful checkpoint when comparing wheel, tire, and restoration history on a prewar Auburn.

On a 1930 Auburn, 650-18 is a numeric bias-ply size. The 6.50 indicates nominal section width in inches, and the 18 indicates the wheel diameter in inches. Within the 1930 Auburn lineup, 650-18 applies to the 125 Series, and the available products in that size fit 18-inch rims with a listed width range of 3.25 to 3.50 inches.

Numeric sizes like 650-18 are usually easier for modern buyers to work with because the wheel diameter is stated directly. For a 125 Series owner, this size is the practical replacement-size reference to confirm when comparing available tires, sidewall appearance, and wheel compatibility. It also helps separate the 125 Series from the 95, 85, and 125WW cars, which each use different width and profile combinations even though the product offerings shown here are also built for 18-inch wheels.

1930 Auburn tire sidewall choices depend on size. In 650-18, Firestone offers blackwall and wide whitewall versions. In 700-18, Firestone offers blackwall, wide whitewall, and double-whitewall versions. In 550-18, Excelsior, Firestone, and BFGoodrich offerings include blackwall, wide whitewall, and double-whitewall styles, while the remaining listed Auburn sizes serve mainly as fitment references here.

For a prewar Auburn, sidewall style has a strong effect on the car's visual character even when the tire size is correct. Blackwalls usually give a more restrained, functional appearance, while whitewall treatments create a more formal luxury look that many owners prefer on prominent 1930 coachwork. If originality matters for a specific body style, market, or judging standard, compare your car to period photos and consult an Auburn specialist before finalizing the sidewall treatment.

Three brands appear in the currently available 1930 Auburn sizes shown here: Firestone, BFGoodrich, and Excelsior. Firestone covers 650-18, 700-18, and part of the 550-18 range, BFGoodrich appears in 550-18, and Excelsior also appears in 550-18. All of the listed offerings are bias-ply tires, which is consistent with the construction expected on an American luxury and performance-oriented car from 1930.

Brand choice on a 1930 Auburn often comes down to the exact size your model uses and the sidewall look you want to achieve. A 125 or 125WW owner is working within Firestone offerings in the currently listed replacement sizes, while an 85 Series owner has the broadest brand spread in 550-18. Once the model and size are confirmed, compare the available sidewall presentations and wheel-width requirements rather than assuming every brand covers every Auburn series.

On the 1930 Auburn, the clearest comparison appears in 700-18, where Firestone Balloon and Firestone Classic Bias Ply are both offered. The Firestone Balloon line appears in blackwall, wide whitewall, and double-whitewall versions, with listed weights from 26 to 35 pounds and a load rating of 1520 pounds at 36 psi. The Firestone Classic Bias Ply listing in 700-18 is shown as a blackwall tire with the same 1520-pound-at-36-psi load figure and the same 3.75 to 4.00 inch rim-width range.

That makes the real difference less about basic fitment and more about presentation within the same size family. If you are matching a specific visual finish, the Balloon line gives more sidewall choices, while the Classic Bias Ply listing is the simpler blackwall option in that same Auburn fitment. For a restoration-minded owner, comparing sidewall style and overall look is likely to matter more here than any fundamental wheel-compatibility difference.

Rim-width requirements on 1930 Auburn tires vary by size. The listed 550-18 products span 3.00, 3.25, and 4.00 inch rim applications depending on brand and series. The 650-18 products fit rims from 3.25 to 3.50 inches, and the 700-18 products fit rims from 3.75 to 4.00 inches. All of those available replacement products use 18-inch rim diameter, but the usable width changes as the tire size changes.

That variation matters because even two Auburn models using 18-inch wheels may not share the same ideal rim width. Before ordering, measure the actual wheel on the car or confirm it against a trusted restoration reference, especially if the car has had wheels swapped over the decades. Matching the tire to both the correct rim diameter and the correct rim-width window helps preserve intended profile, appearance, and road manners.

The currently listed 1930 Auburn products do not show tube-type or tubeless markings in the size descriptions, so tube requirements are best treated as a wheel-and-product confirmation step rather than assumed one way or the other. That is especially important on a 1930 car, because original-style artillery or wire wheels and prewar rim designs often influence whether tubes are used in practice with reproduction bias-ply tires.

A 1930 Auburn owner should check the sidewall marking on the exact tire being considered and compare it with the wheel construction on the car. If you are restoring an original wheel, involve the wheel rebuilder or marque specialist early, since tube, flap, and valve-stem details can affect both installation and reliability. It is a small step that can prevent mismatched components on a very old wheel design.

Original 1930 Auburn wheels cannot be treated as universal across every tire size used by the make that year, even though the currently available replacement products shown here all mount on 18-inch rims. The 85 Series, 125 Series, and 125WW Series use different numeric widths, and their listed rim-width ranges differ accordingly. A 550-18 fitment can call for a different rim-width window than a 650-18 or 700-18 fitment.

In practical terms, staying within the original wheel set for your exact Auburn series is the safer starting point than assuming any 1930 Auburn wheel will interchange with any 1930 Auburn tire. If the car has changed hands many times or wears replacement wheels, confirm the actual diameter and width before mounting tires. That check is especially worthwhile on prewar cars, where a seemingly small wheel mismatch can alter both stance and fit.

A 1930 Auburn should be stored in a cool, dry space away from direct sunlight, electric motors, welders, battery chargers, and other ozone sources that can age rubber. Bias-ply tires also benefit from stable inflation and occasional movement, because long static periods can encourage flat-spotting. Clean floors, moderate temperature swings, and protection from standing moisture all help preserve both the tire casing and the wheel finish on a prewar collector car.

If the car will sit for months, many owners either roll it periodically or place it on stands to reduce constant load on one contact patch. That approach is especially useful on a heavy 1930 Auburn with tall bias-ply tires. Good storage habits will not stop all aging, but they can slow cosmetic cracking and help the car feel more settled when it goes back on the road after a long rest.

On a 1930 Auburn, tire life is usually governed more by age than by mileage. Collector cars often cover few miles each year, so the rubber can age out before the tread wears out. A sensible rule is to begin evaluating condition closely at about five to seven years and to consider replacement around the ten-year mark regardless of remaining tread, using the tire's date code along with visible condition as your guide.

That matters because a prewar Auburn may look ready for the road while the tires have quietly hardened over time. Sidewall cracking, persistent flat-spotting, or a change in how the tire holds pressure can all be signs that age has become the real issue. Keeping a record of installation date and storage conditions helps owners make better replacement decisions than tread depth alone ever could.

Tires on a 1930 Auburn should be checked before every drive, and they deserve a more thorough inspection before any longer outing or tour. Look for sidewall cracking, cuts, bulges, uneven tread wear, and any sign that the tire has been driven underinflated. Because prewar cars often sit for stretches, pressure retention should be monitored regularly rather than assumed from how the tire looks at a glance.

A second, slower inspection is worthwhile after the car has rolled a short distance, especially if it has been parked for weeks. That is the time to notice vibration from flat-spotting, a valve-stem issue, or a wheel that is not running true. Building this habit into every outing is one of the simplest ways to protect both the tires and the larger investment in a 1930 Auburn.

The 1930 Auburn 125 Series is associated with 30X6.50 and 650-18, both in bias-ply form. For a car from 1930, bias-ply construction is the historically appropriate baseline, and the antique 30X6.50 code reflects the sizing language many owners and restorers still encounter in period references. No original equipment brand should be assumed from size alone, even though modern replacement offerings in the currently available numeric size come from Firestone.

That means a restorer should focus first on matching the correct size family and period-appropriate construction, then refine the sidewall treatment to suit the body style and restoration goal. If the car is being judged, details such as whether the car should wear blackwalls or whitewalls may depend on body style, market delivery, and event-specific expectations. Auburn clubs, period photos, and marque historians are the right next step for that last layer of confirmation.

Correct tire fitment matters a great deal when showing a 1930 Auburn, because judges and knowledgeable enthusiasts notice size, construction type, and sidewall presentation very quickly on a prewar car. A tire that belongs to the wrong Auburn series, or a sidewall style that clashes with the car's restoration theme, can stand out even to a casual observer. For 1930 Auburn models, simply staying within the proper size family for the exact series is the first authenticity requirement.

The next layer is visual correctness. A formal sedan, phaeton, or speedster restoration may call for a different cosmetic emphasis even when the tire size itself is right, and event rules can vary on how much flexibility is acceptable. If the car is headed for concours-level scrutiny, confirm the expected sidewall treatment and size convention with the event, the marque club, and surviving period photography before finalizing the tire choice.

The best direct comparison between those lines on a 1930 Auburn comes through 550-18-sized offerings. Firestone's 550-18 products include blackwall and double-whitewall versions with a listed load capacity of 1125 pounds at 32 psi on 3.25-inch rims, while the BFGoodrich Silvertown Classic Bias Ply 550-18 is shown with a 3.00-inch wide whitewall, a load capacity of 1000 pounds at 32 psi, and fitment on a 3.00-inch rim. Both are bias-ply choices appropriate to the era, but their visual treatment and wheel-width fitment are not identical.

For a restoration, that means the difference is not simply brand preference. The sidewall look, the intended wheel width, and the specific load figure all influence which one better suits the car and how it will sit visually. If your Auburn 85 Series is being restored to a very particular presentation, compare the wheel on the car and the appearance you want before selecting between those two classic-style offerings.

1930 Auburn tires in the available listings are all bias-ply products, and no speed-rating letters are shown for the sizes covered here. That means highway suitability should be approached with the broader realities of a 1930 automobile in mind, not just the tire itself. An Auburn from this era may have braking, steering, suspension, and chassis characteristics that make sustained modern-speed travel more about the car's overall condition than about chasing the upper edge of tire capability.

For practical road use, a well-maintained Auburn on fresh, properly fitted tires can certainly be enjoyed on public roads, but it should be driven within the pace that suits its age and condition. Before any extended highway outing, confirm inflation, inspect the casings carefully, and be realistic about traffic speeds, stopping distances, and emergency maneuvering. The safest plan is to match the route and pace to the car, not the other way around.

Inflation pressure on a 1930 Auburn should follow the exact tire size and the specific tire's published load-pressure relationship rather than a one-number rule across the whole make. In the listed products, 550-18 appears with 1000 pounds at 32 psi and 1125 pounds at 32 psi depending on the product, 650-18 appears with 1205 pounds at 36 psi on one listing, and 700-18 appears at 1520 pounds at 36 psi. Those figures are tire ratings, not automatic vehicle settings.

Use the Auburn owner's or service literature as the starting point for the car's intended operating pressure, then compare that guidance with the reproduction tire's rated pressure and load information. The important point is not to transfer a pressure from one Auburn size to another just because the wheels are all 18-inch applications in the available products. Correct inflation depends on the exact size, the tire itself, and how the car is used.

Before a longer drive in a 1930 Auburn, inspect each tire for cracking, cuts, bulges, exposed fabric, irregular wear, and signs of underinflation. Check cold pressures, confirm that the valve stems are sound, and inspect the spare as carefully as the four road tires. On a prewar car, it is also wise to look closely at the wheel hardware and to confirm that the tires are seated properly after any recent service or long storage period.

Tires are only one part of the pre-drive routine on a 1930 Auburn, but they are one of the easiest areas to inspect thoroughly before trouble starts. Pair the tire check with a broader mechanical look at brakes, steering free play, fluids, and lighting so the car is ready for the kind of roads and speeds you plan to use. A calm, methodical inspection is far more valuable than assuming a seldom-driven collector car is ready because it looks good in the garage.