The 1926 Gardner 6 Cyl. comes from an era when independent American automakers still competed on engineering character, road manners, and upscale presentation rather than sheer production volume. A car like this sits firmly in the brass-to-classic transition, where tire choice affects both visual authenticity and how the car carries itself on the road. Fitment centers on two bias-ply sizes, 31X5.25 and 525-21, so the first job is confirming which wheel and tire setup the car actually has. Within 525-21, choices include blackwall and wide whitewall presentations from Firestone, plus an Excelsior Comp H option. That makes the decision as much about wheel fit, appearance, and intended use as size alone.
Which Tire Size Is Right for The 1926 Gardner 6 Cyl.
The 1926 Gardner 6 Cyl. uses two primary tire sizes, and the difference between them starts with wheel setup. Both are bias-ply fitments, but they do not share the same rim diameter, so confirming the actual wheel size on the car is the first step before comparing appearance, brand, or period-style tire choices.
31X5.25 is an antique diameter-by-section size, meaning the first number refers to the tire's approximate outside diameter and the second refers to its section width. This is a bias-ply format associated with early vehicle and light truck-style sizing, making it especially relevant on cars from the mid-1920s where older sizing conventions were still common. For a Gardner owner, the practical value of this size is preserving the proper vintage format rather than substituting a later-style numbering system. Because the wheel setup differs from 525-21, this size should be selected only after the actual rim arrangement on the car is confirmed.
525-21 is a numeric bias-ply size in which 525 represents a nominal section width of about 5.25 inches and 21 identifies the rim diameter in inches. That makes it a more familiar late-1920s style designation, and it is the size with visible product choice for this Gardner. Available options include Firestone and Excelsior, along with blackwall and wide whitewall sidewall treatments and tire series such as Firestone Classic Bias Ply and Comp H. It is the size to evaluate when wheel diameter, sidewall appearance, and rim-width compatibility matter most in the final selection.
The covered sub-model fitment is straightforward in name but still requires a wheel check before tire selection. The Base model is associated with both primary sizes, so the deciding factor is the actual wheel and tire setup on the car rather than trim alone.
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1926 Gardner 6 Cyl. Base
The 1926 Gardner 6 Cyl. Base is associated with both 31X5.25 and 525-21 bias-ply tire fitments. That means the right choice depends on verifying which wheels are on the vehicle today, then choosing the tire format, sidewall style, and product character that best match its restoration or driving goals.
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.
Best 1926 Gardner 6 Cyl. Tires for Sale
Available 525-21 choices include Firestone and Excelsior bias-ply tires with blackwall and wide whitewall sidewall treatments. The product grid is where to compare tire series, rim-width specifications, weight, and load details within this vintage 21-inch fitment.
These FAQs focus on the exact tire sizes used on the 1926 Gardner 6 Cyl., along with wheel confirmation, period-style bias-ply choices, sidewall appearance, and the basic inspection steps worth taking before putting a collector car back on the road.
Tire Size & Fitment
What tire size fits a 1926 Gardner 6 Cyl.?
The 1926 Gardner 6 Cyl. is associated with two primary bias-ply tire sizes: 31X5.25 and 525-21. Those are different sizing systems, and they do not represent the same wheel setup. The Gardner Base sub-model is tied to both sizes, so tire choice begins with identifying which setup is actually on the car.
That distinction matters because the two sizes use different rim diameters. A buyer should confirm the wheel size already installed, then compare the appropriate tire options within that fitment. On a restored or long-stored car, it is also worth checking whether the wheels, hubs, or rims were changed at some point in the vehicle's life.
What size rim does a 1926 Gardner 6 Cyl. use?
The 1926 Gardner 6 Cyl. uses two different rim diameters depending on tire size: 31X5.25 is associated with a 5.0-inch rim diameter, while 525-21 uses a 21-inch rim. Those are not interchangeable formats, so the rim diameter must be confirmed before choosing a tire.
On an antique vehicle, the safest approach is to inspect the wheels directly rather than relying on assumptions. A Gardner that has been restored, re-bodied, or updated over the years may not still wear its earlier wheel setup. Once rim diameter is verified, the next checks are wheel width, tire clearance, and the overall condition of the wheel itself.
What does 31X5.25 mean on a 1926 Gardner 6 Cyl.?
31X5.25 is an antique diameter-by-section tire size. The 31 refers to the tire's approximate outside diameter in inches, and 5.25 refers to the section width. On the 1926 Gardner 6 Cyl., it is a bias-ply fitment that follows an older sizing convention than the more familiar numeric 525-21 format.
That older format is important because it points to a specific wheel and tire arrangement, not just a similar-looking size. A buyer considering 31X5.25 should confirm that the car actually uses that antique setup, then evaluate the tire in the context of wheel compatibility, intended road use, and the desired period-style appearance.
Choosing the Right Tire
What should I consider when choosing a 525-21 tire for a 1926 Gardner 6 Cyl.?
Choosing a 525-21 tire for a 1926 Gardner 6 Cyl. starts with confirming that the car actually uses the 21-inch wheel setup. From there, the key differences are brand, tire series, sidewall style, rim-width specification, weight, and load details. Firestone and Excelsior both appear in this fitment, with blackwall and wide whitewall choices available.
The best selection path depends on how the car will be presented and driven. A wide whitewall creates a more formal pre-war look, while blackwall keeps the presentation more understated. It also helps to compare the wheel width on the car against the tire's approved rim-width range so the finished setup looks right and seats properly.
What sidewall styles are available for 1926 Gardner 6 Cyl. tires?
For the 1926 Gardner 6 Cyl. in 525-21, available sidewall styles include blackwall and wide whitewall. Firestone offers both a blackwall and a 3.00 inch whitewall version in this size, while Excelsior offers a blackwall option. That gives owners a clear appearance choice within the same basic vintage fitment.
Sidewall style changes the car's visual character more than many buyers expect. A wide whitewall often suits a more formal restoration-oriented presentation, while blackwall can look more utilitarian or understated. The right choice depends on the Gardner's finish, wheels, and restoration goals, rather than assuming one sidewall style belongs on every surviving example.
What brands offer tires for the 1926 Gardner 6 Cyl.?
The available 525-21 tire options for the 1926 Gardner 6 Cyl. include Firestone and Excelsior. Firestone appears in the Firestone Classic Bias Ply series, while Excelsior appears in the Comp H series. All of these are bias-ply tires, but they differ in sidewall style and rim-width specification.
Brand choice on an antique car is usually part appearance decision and part fitment decision. It helps to compare the tire series, sidewall treatment, and wheel-width compatibility rather than focusing on the name alone. That approach keeps the final choice centered on how the tire fits the Gardner's wheels and how it supports the look the owner wants.
Restoration & Appearance
Which tire should I choose for a period-style 1926 Gardner 6 Cyl.?
A period-style 1926 Gardner 6 Cyl. should stay with the correct primary bias-ply size for the wheel setup on the car, either 31X5.25 or 525-21. That preserves the vintage tire format that suits a mid-1920s automobile. Within 525-21, the choice then shifts to brand, tire series, and whether a blackwall or wide whitewall presentation better matches the build.
For many restorations, the most important first step is not selecting a brand but confirming the wheel and tire system already fitted to the car. Once that is settled, sidewall style becomes a major visual decision. Buyers pursuing exact historical authenticity should also compare their choice against marque references, period photos, or restoration documentation for their specific car.
Does correct tire fitment matter for a 1926 Gardner 6 Cyl. restoration?
Correct tire fitment matters a great deal on a 1926 Gardner 6 Cyl. because tire size shapes both the car's stance and the way the wheel opening is visually filled. Using the proper bias-ply size also keeps the vehicle aligned with the sizing conventions of its era, which is especially important on an antique automobile.
Restoration fitment is not only about appearance. The wrong rim diameter or an unsuitable wheel-width match can create mounting and clearance issues before the car ever leaves the garage. A careful restoration-minded buyer should verify wheel dimensions first, then select the sidewall style and tire series that best support the intended finished look.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1926 Gardner 6 Cyl.?
Yes. Modifications can affect tire fitment on a 1926 Gardner 6 Cyl., especially if the car has replacement wheels, later rims, altered suspension height, or bodywork changes from an older restoration. Because this Gardner is associated with both 31X5.25 and 525-21, even a wheel conversion alone can completely change which tire size is appropriate.
A buyer should inspect the car as it sits rather than assuming every surviving example remains in original configuration. Wheel diameter, wheel width, brake clearance, steering clearance, and fender space all deserve attention on an antique chassis. That is particularly important before mounting new tires on a car with a long and possibly undocumented ownership history.
What should I inspect before driving a 1926 Gardner 6 Cyl. on new tires?
Before driving a 1926 Gardner 6 Cyl. on new tires, inspect the wheels for damage, corrosion, cracks, and proper bead-seating surfaces. The rest of the running gear deserves attention too, including steering components, suspension condition, and brake operation. Tire pressure should be set appropriately, and each tire should be checked for secure mounting and consistent air retention.
An antique car can look road-ready long before it is truly ready for road use. A short, careful shakedown drive helps reveal rubbing, pull, vibration, or other issues after tire installation. It also makes sense to recheck wheel fasteners and tire pressure once the car has been driven and allowed to settle into its new setup.
How should 525-21 tires on a collector 1926 Gardner 6 Cyl. be maintained?
525-21 tires on a collector 1926 Gardner 6 Cyl. should be inspected regularly for air loss, sidewall cracking, cuts, bulges, and uneven tread wear. Collector cars often sit for long periods, so visual inspection matters just as much as mileage. Tire pressure should be checked before use, not just after the car has been in storage.
Good storage habits help vintage tires age more gracefully. Keeping the Gardner away from prolonged sunlight, excess heat, moisture, and ozone sources can reduce unnecessary deterioration. It is also wise to look over the wheels and valve areas during each inspection, since an old wheel problem can be mistaken for a tire problem on a lightly driven antique car.
