The 1929 Auburn 90 Series comes from a period when American automobiles were becoming more refined, more stylish, and more capable on longer roads, yet still relied on distinctly early tire sizing conventions. For owners of a car from this late-1920s era, tire selection is as much about preserving the character of the vehicle as it is about basic road readiness. The 1929 Auburn 90 Series uses bias-ply fitments in 30X6.00 and 6.00-18, both tied to an 18-inch wheel fitment context. Choosing between them starts with confirming the wheel and existing setup, then deciding whether period-style appearance or straightforward replacement format matters most for restoration and driving use.
Which Tire Size Is Right for The 1929 Auburn 90 Series
The 1929 Auburn 90 Series uses two primary tire sizes, and the key first step is confirming which size is on the car now. Both are bias-ply fitments associated with 18-inch wheel use, but they represent different sizing conventions, so the real decision is matching the car's present wheel and tire setup before comparing tire style and replacement format.
A size like 30X6.00 identifies the tire by approximate overall diameter and section width rather than by the more familiar modern rim-first sizing format. On a 1929 Auburn 90 Series, that makes it a distinctly early-style bias-ply fitment that suits the character of a late-1920s automobile. This format is especially relevant to owners trying to preserve an authentic pre-war visual presentation and traditional tire profile. Before choosing it, compare the tire currently on the car, confirm the wheel setup, and make sure the existing fitment has not already been changed to a later numeric size convention.
The 6.00-18 size is a numeric bias-ply designation in which 6.00 refers to nominal section width in inches and 18 identifies the rim diameter. For a 1929 Auburn 90 Series, it represents a vintage replacement format that is more familiar to many collectors than older diameter-by-section markings. It still keeps the proper bias-ply construction character, but it expresses the fitment in a more standardized rim-based size. This is the size to evaluate if the Auburn is already running 18-inch tires marked in numeric form and the goal is to stay aligned with that existing setup.
Sub-model fitment is straightforward here because the covered Auburn 90 Series configuration shares the same pair of primary bias-ply tire sizes. Checking the exact sub-model still matters, since the car may already be set up around one vintage sizing convention or the other.
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1929 Auburn 90 Series 8 Cyl.
The 1929 Auburn 90 Series 8 Cyl. uses the same two primary bias-ply size formats found on this vehicle line, so tire selection centers more on the car's present wheel and tire setup than on trim differences. That makes it especially important to confirm whether the car is currently using antique diameter-by-section markings or numeric 18-inch sizing before choosing a replacement.
The tire sizes listed on this page assume factory-standard vehicle configuration. The following modifications may affect tire fitment and are not reflected in this guide:
Suspension changes (lowering, lift kits, spring replacements)
Body alterations (fender modifications, custom bodywork)
If your vehicle has been modified from factory specifications, verify tire clearance before purchase.
Frequently Asked Questions
Common questions for the 1929 Auburn 90 Series usually center on its two bias-ply tire sizes, how those vintage size markings differ, and what should be checked on a collector car before selecting tires for restoration or road use.
Tire Size & Fitment
What tire size fits a 1929 Auburn 90 Series?
The 1929 Auburn 90 Series uses two primary bias-ply tire sizes: 30X6.00 and 6.00-18. Those are both valid fitments for this vehicle, and the covered 8 Cyl. sub-model uses the same pair of sizes rather than a separate sub-model-specific tire size.
The practical choice is determining which sizing convention matches the car's current wheel and tire setup. A restored Auburn may already be equipped around one of these two formats, so checking the tire sidewall markings, wheel size, and overall stance of the car is the right next step before selecting a replacement.
What size rim does a 1929 Auburn 90 Series use?
The 1929 Auburn 90 Series uses an 18-inch rim fitment. That rim diameter is directly expressed in the 6.00-18 size, while the 30X6.00 fitment follows an older diameter-by-section convention and should still be checked against the wheel currently on the car.
Rim diameter is only part of the fitment picture on a collector car of this age. It is also smart to confirm the wheel's actual width, bead condition, and whether the car still has its original-style wheels or a later replacement set before settling on one of the two primary tire sizes.
What does 30X6.00 mean on a 1929 Auburn 90 Series?
On a 1929 Auburn 90 Series, 30X6.00 is an antique diameter-by-section size. The first number refers to the tire's approximate overall diameter, and the second refers to section width, which makes it different from later rim-diameter-based formats such as 6.00-18.
That older sizing style matters because it reflects how many late-1920s tires were identified and replaced. If the Auburn currently wears 30X6.00 tires, staying with that format may help preserve the car's traditional look, but the wheel and existing fitment should still be checked carefully before choosing a replacement.
Choosing the Right Tire
What should I consider when choosing a 30X6.00 or 6.00-18 tire for a 1929 Auburn 90 Series?
Start with the size already fitted to the car, because the 1929 Auburn 90 Series uses both 30X6.00 and 6.00-18 as primary bias-ply fitments. The first is an antique diameter-by-section format, while the second is a numeric bias-ply size built around an 18-inch rim designation.
From there, the main factors are wheel compatibility, the car's present stance, and the appearance goal for the restoration or driver. A car already set up for one format should not be assumed to accept the other without checking the wheel, mounted-tire dimensions, and body or steering clearance around the front end.
How do I choose between the available 1929 Auburn 90 Series tire sizes?
Choosing between the two Auburn tire sizes is mostly a matter of matching the car rather than choosing a newer or older performance option. Both 30X6.00 and 6.00-18 are bias-ply fitments, so the deciding factor is usually which size format the car is already equipped to use.
An Auburn that has long been maintained in antique diameter-by-section sizing may call for a different replacement approach than one already standardized around 6.00-18. Looking at the existing sidewall markings, wheel diameter, and overall visual proportion of the tire on the car helps keep the replacement choice consistent with the current setup.
What rim-fitment details should I compare when choosing 1929 Auburn 90 Series tires?
The first rim-fitment detail to confirm is the 18-inch wheel diameter associated with this Auburn's tire fitment. That is straightforward with 6.00-18, while 30X6.00 should be cross-checked against the wheel on the car because it uses an older size-marking system.
Beyond diameter, inspect the wheel's width, condition, and whether it remains the type intended for vintage bias-ply tires. On a collector car from 1929, wheel age and prior repairs can matter just as much as size, so a careful inspection helps avoid choosing a tire that does not suit the existing wheel setup.
Restoration & Appearance
Which tire should I choose for a period-style 1929 Auburn 90 Series?
For a period-style 1929 Auburn 90 Series, the starting point is staying with one of the correct primary bias-ply sizes: 30X6.00 or 6.00-18. The more appropriate choice depends on which size convention matches the car's present wheel and tire setup and the visual direction of the restoration.
The 30X6.00 format has a distinctly early presentation that suits late-1920s fitment language, while 6.00-18 reflects a more familiar numeric vintage sizing style. If exact originality is especially important, compare the car against marque references, period photos, or restoration records before making a final tire selection.
Does correct tire fitment matter for a 1929 Auburn 90 Series restoration?
Correct tire fitment matters a great deal on a 1929 Auburn 90 Series because tire shape, overall proportion, and sidewall presence contribute heavily to how a late-1920s car sits and looks. Using one of the proper bias-ply sizes helps preserve the vehicle's intended visual character.
Appearance is only part of the equation, though. A restoration-minded tire choice should also respect the wheel diameter, the current mounting arrangement, and the practical condition of the wheels themselves, since an Auburn that looks right on paper still needs a tire and wheel combination suited to safe road use.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1929 Auburn 90 Series?
Yes, modifications can affect tire fitment on a 1929 Auburn 90 Series even when the tire size itself is correct. Changes to wheels, suspension height, steering components, or bodywork can alter the space available for a vintage bias-ply tire and change how either 30X6.00 or 6.00-18 sits on the car.
A car of this age may also have accumulated decades of repairs or parts substitutions, so it is worth checking the actual wheel diameter, wheel width, and clearance at full steering lock. Those checks become especially important if the Auburn has replacement wheels or suspension work from a previous restoration.
What should I inspect before driving a 1929 Auburn 90 Series on new tires?
Before driving a 1929 Auburn 90 Series on new tires, inspect the wheels, valve stems, mounting condition, and the car's suspension and steering components. The tires themselves should be checked for proper inflation, even seating on the wheel, and any signs of damage after installation.
A short initial drive should be followed by another inspection for air loss, rubbing, or any unusual behavior through the steering. On an older collector car, new tires cannot compensate for worn wheel bearings, loose steering parts, or damaged rims, so the surrounding chassis condition deserves just as much attention.
How should 30X6.00 and 6.00-18 tires on a collector 1929 Auburn 90 Series be maintained?
Collector-car tires on a 1929 Auburn 90 Series should be maintained with regular pressure checks, visual inspections, and careful storage habits. Both 30X6.00 and 6.00-18 are vintage-style bias-ply fitments, so sidewall condition, tread condition, and signs of age should be reviewed even if the car is driven only occasionally.
Long periods of inactivity can be hard on older vehicles and their tires, especially when they sit in heat, sunlight, or damp conditions. Keeping the Auburn clean, stored indoors when possible, and inspected before each driving season helps catch cracking, flat spotting, or air loss before they become road-use problems.
