The 1926 Buick Standard comes from a period when American cars were rapidly becoming more refined, yet still depended on tall, narrow tires that shaped both ride quality and appearance. For many collectors, this Buick sits squarely in the transition from early motoring toughness to more polished touring comfort. Tire fitment on this model centers on two bias-ply sizes, 31X5.25 and 525-21, so the first step is confirming which wheel setup is actually on the car. Within the correct size, the real choices involve sidewall presentation, brand, and restoration character. That matters especially on a pre-war Buick where tire profile and sidewall style are so visible.
Which Tire Size Is Right for The 1926 Buick Standard
The 1926 Buick Standard uses two primary tire sizes, and the difference between them starts with wheel diameter. Both fitments are bias-ply, but they do not represent the same sizing system, so the first step is confirming the exact wheel and tire setup on the car. Once that is settled, the decision shifts to sidewall style, brand, and how closely the tire matches the Buick’s intended period presentation.
A 31X5.25 tire uses an older diameter-by-section format, where the first number refers to the tire’s approximate overall diameter and the second refers to its nominal section width. This is a bias-ply fitment with a distinctly early-car sizing convention that suits the visual proportions of a mid-1920s Buick. Its main relevance is fitment verification, because this format differs sharply from later numeric bias-ply sizing. If your Buick has been changed over time, confirming the actual wheel and tire combination on the car is essential before selecting anything in this size.
A 525-21 tire uses a numeric bias-ply format, with 5.25 indicating nominal section width and 21 identifying rim diameter. This size opens up meaningful product choice for the 1926 Buick Standard, including Firestone and Excelsior options, along with blackwall and wide whitewall sidewall treatments across different tire series. It remains a traditional bias-ply fitment, which helps preserve the tall, upright tire look associated with cars of this era. For many owners, this size becomes a choice between a more understated touring appearance and a more formal restoration-oriented presentation.
Sub-model fitment is straightforward here because the covered Buick Standard 6 Cyl. uses the same two primary tire sizes found at the model level. The important step is not trim identification so much as confirming which wheel and tire setup remains on the car today.
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1926 Buick Standard 6 Cyl.
The 1926 Buick Standard 6 Cyl. uses the same bias-ply fitment pattern, with 31X5.25 and 525-21 both associated with the model. That makes wheel confirmation especially important, then tire selection can focus on period-style appearance, blackwall versus whitewall presentation, and the product characteristics available within the correct size.
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 Buick Standard Tires for Sale
Available 525-21 tires for the 1926 Buick Standard include Firestone and Excelsior offerings in Firestone Classic Bias Ply and Comp H lines. The main comparison points are blackwall versus wide whitewall appearance, along with rim-width compatibility and other product-specific construction details.
Common 1926 Buick Standard tire questions usually come down to confirming the correct size system, understanding the 21-inch fitment, comparing sidewall styles, and checking the car carefully before returning a collector vehicle to regular road use.
Tire Size & Fitment
What tire size fits a 1926 Buick Standard?
The 1926 Buick Standard uses two primary bias-ply tire sizes: 31X5.25 and 525-21. Those sizes reflect two different vintage sizing systems, so the answer is not simply a matter of choosing by width alone. Both are associated with the Buick Standard 6 Cyl., which makes the actual wheel and tire setup on the car especially important.
A car that has been restored, repaired, or converted over the years may not still wear the same wheel arrangement it once did. Measure the wheel diameter, verify the tire marking currently on the car, and compare the overall setup before purchasing replacements. On a 1920s Buick, that step matters as much as the tire brand or sidewall style.
What size rim does a 1926 Buick Standard use?
Rim size depends on which tire size is on the car. The 525-21 fitment uses a 21-inch rim, while the 31X5.25 fitment is associated with a 5.0-inch rim diameter in this application. Because those two fitments are not interchangeable by label alone, wheel confirmation is the first step in selecting a tire.
Vintage cars often pass through multiple owners, and wheel changes are common over time. Check the actual wheel diameter and compare it with the tire marking before moving forward. On the 525-21 fitment, product rim-width specifications also matter, since available tires are built around different approved rim-width ranges within the same nominal size.
Do all 1926 Buick Standard sub-models use the same tire size?
The covered sub-model, the 1926 Buick Standard 6 Cyl., uses the same two tire sizes tied to the model: 31X5.25 and 525-21. That means sub-model naming is not the main source of fitment difference here. The more important distinction is which wheel and tire combination is actually installed on the car.
That matters because a pre-war Buick may have been refitted during restoration or long-term service. A buyer should verify the wheel diameter, current tire marking, and overall visual setup rather than assuming one size applies automatically. Once the correct size is confirmed, selection becomes much easier and can focus on appearance and product details.
Choosing the Right Tire
What should I consider when choosing a 525-21 tire for a 1926 Buick Standard?
Start with the basics: correct size, bias-ply construction, and wheel compatibility. In 525-21, the 1926 Buick Standard has choices from Firestone and Excelsior, and those options differ by tire series, sidewall style, rim-width range, and other product characteristics. Blackwall and wide whitewall versions create noticeably different visual results on a 1920s Buick.
Appearance often drives the final decision on a car from this era, but fitment still comes first. Compare the tire’s approved rim-width range with the wheel on the car, then think about how formal or understated you want the Buick to look. That approach helps narrow the choice without treating every 525-21 tire as functionally identical.
What sidewall styles are available for 1926 Buick Standard tires?
For 525-21 fitment, available sidewall styles include blackwall and wide whitewall. That gives the 1926 Buick Standard two very different period-style visual directions, even while staying within the same basic size and bias-ply construction. Firestone offers both blackwall and a 3.00 inch wide whitewall treatment in this size.
Sidewall choice changes the car’s appearance more than many buyers expect, especially on tall 1920s tires with a lot of visible sidewall area. A blackwall usually gives a more restrained touring look, while a wide whitewall creates a more formal restoration-oriented presentation. Choose the look that suits the car’s finish, trim, and intended use.
What brands offer tires for the 1926 Buick Standard?
The 525-21 size for the 1926 Buick Standard is available from Firestone and Excelsior. Firestone options appear in the Firestone Classic Bias Ply line, while Excelsior is represented by the Comp H series. All of those are bias-ply choices, but they differ in sidewall styling and wheel-compatibility details.
Brand choice should be considered alongside the tire series and the exact presentation you want on the car. A buyer comparing these options should also look at rim-width specifications and any load information included with the tire. That keeps the decision grounded in fitment and intended appearance rather than name recognition alone.
Restoration & Appearance
Which tire should I choose for a period-style 1926 Buick Standard?
A period-style 1926 Buick Standard tire choice starts with retaining the correct primary size and bias-ply construction for the wheel setup on the car. If the Buick uses 525-21, available options include both blackwall and wide whitewall presentations. That allows the car to keep the tall, narrow visual profile associated with mid-1920s motoring.
The final choice usually depends on whether the restoration leans toward a more restrained touring look or a more formal display-oriented appearance. Exact originality can vary by how the car was delivered and later restored, so buyers pursuing highly specific historical accuracy should compare their tire choice with marque references and vehicle-specific documentation.
Does correct tire fitment matter for a 1926 Buick Standard restoration?
Correct tire fitment matters a great deal on a 1926 Buick Standard because the tire is such a visible part of the car’s stance and character. Tall sidewalls, narrow tread proportions, and the right vintage sizing system all shape how the Buick sits and how authentic the overall presentation feels to an informed enthusiast.
Even when the car is not being restored for formal judging, the wrong size can alter its visual balance and create avoidable fitment concerns. Confirming the wheel diameter and selecting the proper bias-ply format first will usually do more for the Buick’s appearance than chasing small cosmetic details later in the restoration process.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1926 Buick Standard?
Yes. A 1926 Buick Standard may have had wheel, brake, suspension, or body work performed over many decades, and any of those changes can affect tire fitment. That is especially important on a car associated with both 31X5.25 and 525-21 sizes, because the wheel setup itself may no longer match what a buyer expects.
Check the actual wheel diameter, wheel width, and tire marking already on the car before selecting replacements. Steering clearance and fender clearance also deserve attention on older vehicles with tall tires. A careful inspection helps prevent ordering a correct vintage size for the wrong wheel arrangement.
What should I inspect before driving a 1926 Buick Standard on new tires?
Before road use, inspect the wheels, valve hardware, and overall mounting condition, then confirm inflation is appropriate for the tire being used. Look over the steering and suspension for looseness, and make sure the new tires clear the fenders and chassis throughout normal steering movement. A 1920s Buick depends heavily on the condition of the whole running gear.
Tire installation alone does not make an old car road-ready. Recheck pressure after the tires have settled, watch for any uneven stance, and listen for rubbing or unusual movement on the first short drive. A cautious shakedown run is wise before taking the car farther from home or at sustained road speed.
How should 1926 Buick Standard tires be maintained on a collector vehicle?
Collector-car tires should be checked regularly for pressure loss, cracking, cuts, bulges, and tread condition, even when the car is driven only occasionally. The 1926 Buick Standard’s tall bias-ply tires are a large visual and functional part of the car, so deterioration is often easy to spot if the vehicle is inspected routinely.
Storage conditions matter almost as much as mileage. Keep the Buick away from prolonged sunlight, excess heat, moisture, and ozone sources, and avoid letting it sit for long periods on underinflated tires. Occasional movement and consistent inspections help preserve both tire condition and the car’s readiness for safe road use.
