1926 Vehicle Tire Fitment Guide

Shared by eleven makes, 30X5.25 is a major 1926 fitment used on cars such as the 1926 Auburn 44 Series, 1926 Chrysler 4 Cyl., 1926 Hupmobile 6 Cyl., and 1926 Overland 93 Series. This widespread use makes it one of the core sizes for midrange six-cylinder and similar period vehicles. The older dimensional format is typical of the era, so owners often cross-check this marking against alternate tire nomenclature already fitted to the car. Because this size spans many different makes, product selection should always follow exact vehicle and wheel confirmation rather than make alone.

The 5.25-20 designation covers a large share of 1926 midrange cars and mirrors the same broad application pattern seen with 30X5.25. It appears on eleven makes, including the 1926 Auburn 66 Series, 1926 Chrysler 4 Cyl., 1926 Oakland 6 Cyl., and 1926 Willys-Knight 70 Series. This is a bias-ply 20-inch wheel fitment that suits owners seeking a practical way to identify wheel diameter while preserving period sizing. Since many vehicles in this group are now collector cars with mixed restoration histories, confirming wheel size and overall clearance is still an important final step.

The 30X5.77 size is one of the more distinctive and widely shared 1926 fitments, used across thirteen makes including the 1926 Auburn 88 Series, 1926 Chrysler 6 Cyl., 1926 Paige 6 Cyl., and 1926 Reo 6 Cyl. It tends to show up on cars positioned above the smaller four-cylinder and entry-level six-cylinder applications. As with many antique sizes, the exact sidewall marking matters because similar-looking alternatives from the same year may reflect a different wheel or tire profile. This is a fitment where period appearance and proper dimensional matching are equally important.

Used on twelve makes, 30x5 overlaps the same general vehicle class as 30X5.77 and appears on models such as the 1926 Davis 92 Series, 1926 Flint 60 Series, 1926 Locomobile Jr. 8, and 1926 Willys-Knight Gt. 6. The lower-case formatting is simply a labeling variation, but the designation itself should still be matched carefully as marked. This remains a bias-ply application tied to period-correct collector-vehicle needs rather than modern replacement logic. On restored or modified cars, checking wheel width, fender clearance, and existing tire markings can prevent ordering a size that only looks close on paper.

The 31X5.25 size appears across seven makes, including the 1926 Buick Standard, 1926 Dodge 4 Cyl., 1926 Franklin 11A, and 1926 Studebaker Standard. It occupies an important middle ground in 1926 fitment, serving a range of mainstream passenger cars without moving into the largest luxury-car sizes. This older dimensional marking fits the period and can be especially relevant for owners trying to preserve a vintage stance and sidewall profile. Since many restored cars may now wear alternate markings on replacement tires, it helps to verify both the vehicle application and the wheel before choosing products.

Rim Diameter: 21 in  ·  Sidewalls: Wide Whitewall, Blackwall

525-21 is a shared 21-inch bias-ply fitment used on seven makes, among them the 1926 Buick Standard, 1926 Dodge 4 Cyl., 1926 Franklin 11A, and 1926 Velie 60 Series. Product support is strong, with Firestone available in blackwall and wide whitewall versions, plus an Excelsior Comp H option. Firestone listings specify a 21-inch rim diameter, a 2.50 to 3.00 inch rim-width range, and a maximum load rating of 1120 pounds at 36 psi. For owners balancing restoration appearance and practical fitment, the sidewall treatment and intended wheel width are important distinctions within this one tire size.

This large bias-ply designation is tied specifically to the 1926 Cadillac 8 Cyl., placing it among the year’s more substantial luxury-car tire fitments. A size like 33X7.00 reflects the scale of premium eight-cylinder cars from the mid-1920s, where larger overall tire dimensions were part of the vehicle’s visual and mechanical character. Because it is associated with a single make in this guide, shoppers should treat it as a specialized application rather than a broadly shared 1926 size. Exact verification is especially important on high-end restored cars, which may have seen wheel substitutions over many decades.

Rim Diameter: 21 in  ·  Sidewalls: Blackwall, Wide Whitewall, Double-Whitewall

The 700-21 fitment serves several prominent 1926 luxury and high-line cars, including the 1926 Cadillac 8 Cyl., 1926 Lincoln 8 Cyl., 1926 Pierce Arrow 33 Series, and 1926 Stearns-Knight 6S. Product choices are notably diverse, with Firestone Balloon, Michelin Double Rivet, and blackwall, wide whitewall, and double-whitewall Firestone offerings. Some Firestone versions list a 21-inch rim diameter, a 3.75 to 4.00 inch rim-width range, and load capacity up to 1930 pounds at 40 psi. This is a size where both the correct visual presentation and the wheel specification deserve close attention.

The 32X6.50 size is a single-application fitment for the 1926 Case JIC. It sits in the larger 1926 passenger-car range and reflects the more specialized tire dimensions used by certain makes outside the highest-volume brands. Because this designation is not widely shared, owners should avoid assuming that another nearby Case or luxury-car size is a safe substitute. Antique tire sizing from this era can look deceptively similar across models while differing in important ways. For an accurate selection, confirm the exact model, inspect the current wheel setup, and compare the tire marking carefully before buying.

Rim Diameter: 20 in  ·  Sidewalls: Wide Whitewall, Blackwall

650-20 is one of the most important large-size applications for 1926, appearing on ten makes including the 1926 Chrysler Imperial, 1926 DuPont D, 1926 Jordan Gt Line-8, 1926 Studebaker Special, and 1926 Stutz 8 Cyl. Product options include Firestone blackwall and wide whitewall versions, along with Denman and Deka blackwall choices in classic truck-oriented series. Firestone listings show a 20-inch rim diameter, a 3.00 to 5.00 inch rim-width range, and a load capacity of 2120 pounds at 60 psi. This size deserves careful selection because appearance, intended use, and wheel width can vary within the available offerings.

This very large bias-ply fitment is associated only with the 1926 Case Y. It represents one of the year’s more substantial tire sizes and highlights how certain makes used dimensions well outside the more common midrange passenger-car fitments. A designation like 34X7.30 should be treated as highly specific, especially on a vehicle that may have undergone restoration work or long-term storage. Owners should confirm the exact sidewall marking and wheel arrangement rather than relying on a broad year search alone. On antique applications at this size, clearance and proper wheel matching are essential.

The 7.30-20 size appears on the 1926 Case Y and provides the same application in a rim-diameter-based format that many owners find easier to interpret. This is still a large, bias-ply 20-inch fitment intended for a substantial 1926 vehicle rather than a common shared application. Because it sits near other large sizes from the same era, exact matching remains important; similar numeric designations do not automatically mean the same tire. For a specialty car like the Case Y, confirming wheel dimensions and overall tire clearance is especially helpful before selecting a replacement.

Used specifically on the 1926 Chandler 35 Series, 33X6.50 is a specialized bias-ply size that fits into the larger touring-car range of the year. It is distinct from the more widely shared 33X6.00 and 33X6.75 fitments, which makes careful identification important during restoration or replacement. Antique tire sizing can be easy to misread, especially when a car has been off the road for decades or carries older replacement tires. For Chandler owners, this is a case where the full model identification and the exact sidewall marking should guide the buying decision rather than general year or make assumptions.

The 29X4.40 size appears on the 1926 Chevrolet 4 Cyl. and 1926 Ford T Series, placing it among the smaller and more familiar 1926 passenger-car fitments. These applications reflect straightforward, lightweight-era bias-ply sizing common to practical four-cylinder cars. Because the same general vehicle class may also appear with 4.40-21 labeling, owners should verify the tire marking on the car and confirm the wheel before ordering. For restorers, the appeal of this size is often tied to maintaining a compact, period-appropriate profile that suits the proportions of these well-known 1920s models.

This shared 21-inch bias-ply size is used on the 1926 Chevrolet 4 Cyl., 1926 Ford T Series, and 1926 Star 4 Cyl. It represents one of the year’s smaller, lighter-duty passenger-car fitments and is useful for shoppers who want a rim-diameter-based designation rather than an older overall-dimension format. Because it serves multiple entry-level models, 4.40-21 is a practical comparison point when researching early 1926 vehicle tires. Even so, wheel changes are common in the collector world, so it is smart to verify the actual wheel diameter and any brake or fender clearance concerns before installation.

The 32X6.20 fitment is shared across eight higher-end 1926 applications, including the 1926 Chrysler Imperial, 1926 Marmon 74 Series, 1926 Stutz 8 Cyl., and 1926 Wills, Sainte Claire 8 Cyl. It sits in the larger premium-car range and reflects the broader, more substantial tire proportions often seen on advanced sixes and eights of the period. Since multiple marques share it, this size can simplify product research, but not every wheel setup will be identical across those vehicles. Owners should confirm both the tire designation and the wheel configuration before choosing a replacement.

Used on seven distinguished 1926 makes, 33X6.75 belongs to the large luxury and near-luxury end of the market. It appears on the 1926 Cunningham 8, 1926 Lincoln 8 Cyl., 1926 Locomobile 48, 1926 Pierce Arrow 33 Series, and others. This bias-ply fitment reflects the substantial scale of these automobiles and the period’s preference for tall tire profiles. Because it is associated with prestigious collector vehicles, buyers often consider both appearance and specification carefully. The exact size should be matched rather than approximated, especially where steering geometry, body clearance, and restoration goals matter.

The 31X6.75 size is specific to the 1926 Duesenberg 8 Cyl., making it one of the year’s more singular applications. As expected for a high-end eight-cylinder car, this is a substantial bias-ply fitment that should be treated as a dedicated specification rather than a broadly interchangeable size. On collector vehicles of this level, small differences in dimensions can affect stance, fender relationship, and overall authenticity of presentation. Anyone sourcing 1926 Duesenberg 8 Cyl. tires should inspect the current wheel and tire markings closely and avoid substituting a similar large size without confirming all fitment details.

Rim Diameter: 19 in  ·  Sidewalls: Blackwall, Double-Whitewall, Wide Whitewall

The 700-19 fitment is tied to the 1926 Duesenberg 8 Cyl. and benefits from a useful range of available products. Firestone, Lester, and Firestone Balloon options are offered in blackwall as well as double-whitewall form, giving owners flexibility in visual style. Some listings specify a 19-inch rim diameter, a 3.75 to 4.00 inch rim-width range, and load capacities around 1570 to 1585 pounds at 36 psi depending on the product. For a prestigious 1926 car, that blend of construction consistency and sidewall choice can be important when balancing period look, wheel compatibility, and intended road use.

This size appears on the 1926 Jewett 6 Cyl., 1926 Overland 91 Series, and 1926 Pontiac 6 Cyl., placing it among the smaller-to-midrange six-cylinder fitments for 1926. It is a bias-ply application in an older size convention, and it shows how several makes in the middle of the market shared similar dimensional needs. For owners comparing fitments, 29X4.75 offers a useful example of how compact 1926 cars could still differ from the even smaller 4.40-21 class. Matching the exact marking remains the best approach, especially on cars that may no longer retain their original wheels.

The 4.75-20 designation is used on the 1926 Jewett 6 Cyl., 1926 Overland 91 Series, and 1926 Pontiac 6 Cyl. As a 20-inch bias-ply fitment, it gives owners a clearer wheel-diameter reference than some of the older dimensional markings found elsewhere in 1926 applications. This size suits smaller and moderate-sized six-cylinder cars and helps illustrate how wheel diameter could differ even among similarly positioned models from the same year. For anyone replacing antique tires, verifying the actual wheel and the tire marking together is still important, since surviving cars often reflect decades of repairs and parts swaps.

The 30X6.00 size is a single fitment for the 1926 Jordan Line-8. It stands apart from the more widely shared 30X5.25 and 30X5.77 groupings, which means Jordan owners should treat it as a model-specific requirement rather than a general 1926 large-car size. The older dimensional convention fits the era and may require careful reading when compared with existing replacement tires or period literature. Because this application is tied to one specific model, it is especially useful to confirm the complete vehicle identity, inspect the wheel, and compare the sidewall marking before selecting a product.

Used on the 1926 Jordan Line-8, 6.00-18 is one of the year’s less common 18-inch applications. The rim-diameter-based marking makes the wheel size easier to identify, but the fitment is still highly specific to this model and should not be confused with larger 20-inch or 21-inch Jordan-related sizes. This bias-ply application can be especially important for owners concerned with maintaining the right stance and proportions on a collector vehicle with sporting or upscale character. Before ordering, it is wise to confirm that the car still carries the correct 18-inch wheel setup.

The 30X4.95 size appears on the 1926 Oldsmobile 6 Cyl. and 1926 Star 6 Cyl. It occupies a useful middle ground between the smallest 1926 four-cylinder fitments and the larger six-cylinder and eight-cylinder applications found elsewhere in the year. As a bias-ply size in an older dimensional format, it is best approached by exact sidewall matching rather than by visual approximation. For owners of practical mid-1920s collector cars, this size can be important in preserving the proper period profile while still narrowing product choices through the vehicle’s specific make and model.

This 21-inch bias-ply fitment is used on the 1926 Oldsmobile 6 Cyl. and 1926 Star 6 Cyl. It gives shoppers a clearer wheel-diameter reference while staying in the moderate passenger-car range for the year. Compared with the larger 5.25-20 and 6.00-21 class applications, 5.00-21 suits smaller six-cylinder cars and may appeal to restorers focused on maintaining the right overall proportions. Because many 1920s vehicles have lived through wheel swaps, puncture repairs, and long storage, checking both the wheel and the exact tire designation remains the most dependable way to confirm fitment.

Rim Diameter: 22 in  ·  Sidewalls: Wide Whitewall, Blackwall

The 600-22 size is a specialized fitment for the 1926 Pierce Arrow 80 Series and stands out immediately because of its 22-inch rim diameter. Available products include BFGoodrich blackwall and 3.50-inch whitewall versions in the BFGoodrich Classic Truck series, both with a listed maximum load capacity of 1350 pounds at 36 psi and a 3.00 to 3.75 inch rim-width range. Although this is a Pierce Arrow passenger-car application in the guide, the available product line carries a truck-oriented attribute, so owners should review the visual style and wheel specification carefully when choosing the best match.

This size is specific to the 1926 Star 4 Cyl. and represents one of the smallest tire applications in the year. The 29X4.50 designation uses an early dimensional style that can be confused with nearby 29X4.40 or 29X4.75 fitments, so exact identification is important. On compact 1920s four-cylinder cars, relatively small dimensional differences can influence appearance and wheel compatibility more than many owners expect. For a proper replacement, confirm the model, examine the existing wheel and tire markings, and avoid assuming that another Star or small-car 1926 size will be close enough.

The 32X6.75 fitment belongs to the 1926 Studebaker Big 6 Cyl. and reflects a substantial tire size for a larger, more powerful passenger-car application. It sits close to other large 1926 premium-car sizes, but it remains its own specification and should be matched exactly. This is the kind of fitment where preserving the right visual scale matters to both restoration quality and practical road clearance. Owners researching 1926 Studebaker Big 6 Cyl. tires should confirm the car’s current wheel setup and overall configuration, especially if the vehicle has undergone restoration, brake work, or wheel replacement.

Rim Diameter: 20 in  ·  Sidewalls: Double-Whitewall, Wide Whitewall, Blackwall

The 700-20 size is used on the 1926 Studebaker Big 6 Cyl. and offers one of the strongest product selections in the year. Firestone and BFGoodrich options include blackwall, wide whitewall, and double-whitewall styles, with listed load capacities ranging from 1700 pounds at 36 psi to 1980 pounds at 42 psi depending on the product. Several versions specify a 20-inch rim diameter, while rim-width guidance varies by brand and series. That makes 700-20 a size where sidewall appearance, wheel width, and the exact product specification all deserve attention rather than choosing by size alone.