The 1926 Overland 91 Series comes from the middle years of American motoring, when practical touring cars still relied on tall, narrow tires and owners expected them to handle rougher road surfaces than later cars ever saw. That context matters when choosing tires today, because this exact model uses bias-ply fitments in two vintage sizes: 29X4.75 and 4.75-20. Those sizes reflect two different older sizing conventions rather than a modern passenger-car format. For a restoration-minded owner, the real task is confirming which wheel setup is on the car and then choosing a tire that preserves the right stance, look, and road-going compatibility.
Which Tire Size Is Right for The 1926 Overland 91 Series
The 1926 Overland 91 Series uses two primary tire sizes, and the first step is confirming which wheel and rim diameter your car actually has. Both fitments are bias-ply, but they represent different vintage sizing systems, so choosing correctly depends on matching the car's current wheel setup rather than assuming one old-size convention automatically replaces the other.
A 29X4.75 tire uses an older diameter-by-section format in which the first number refers to the tire's approximate overall diameter and the second refers to its section width. On the 1926 Overland 91 Series, this is a bias-ply fitment that belongs to an earlier tire-sizing tradition than later numeric rim-based sizes. That makes it especially important for owners preserving an antique-style presentation or sorting out a car that may have changed wheels during its life. Confirm the wheel dimensions carefully before selecting this size, because the naming format does not work like a modern radial code.
A 4.75-20 tire is a numeric bias-ply size, with 4.75 indicating nominal section width in inches and 20 identifying the rim diameter. For the 1926 Overland 91 Series, this format is more familiar to many vintage-car owners because it ties the tire directly to a 20-inch wheel. Its practical value is clarity: it gives a straightforward way to match the tire to the wheel diameter already on the car. This is the size to evaluate when the car is fitted with 20-inch rims and the goal is a proper vintage bias-ply replacement.
Tire fitment is straightforward here because the covered sub-model uses the same two vintage bias-ply sizes. The important step is not choosing between trims, but confirming which wheel setup is actually on the car before selecting a tire.
1
1926 Overland 91 Series 4 Cyl.
The 1926 Overland 91 Series 4 Cyl. can use either of the two primary bias-ply fitments associated with this model. Tire selection therefore starts with wheel verification, followed by deciding which size best matches the car's present rims and restoration direction.
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
Owners of a 1926 Overland 91 Series usually need clarity on vintage tire-size meaning, wheel confirmation, and how to choose between two bias-ply fitments. These FAQs focus on exact size selection, restoration-minded appearance, and the checks worth making before road use.
Tire Size & Fitment
What tire size fits a 1926 Overland 91 Series?
The 1926 Overland 91 Series uses two primary bias-ply tire sizes: 29X4.75 and 4.75-20. Those are both vintage fitments, but they are written in different sizing systems. One is an antique diameter-by-section size, while the other is a numeric bias-ply size tied directly to a 20-inch rim.
The practical choice depends on the wheels currently on the car. Many antique vehicles have seen wheel changes over the decades, so the safest approach is to confirm the actual rim dimensions before ordering tires. Matching the correct size to the existing wheel setup helps preserve proper fit, appearance, and usable clearance.
What size rim does a 1926 Overland 91 Series use?
Rim size depends on which tire size is on the car. The 4.75-20 fitment uses a 20-inch rim, while the 29X4.75 fitment is associated with a different wheel setup. On a car of this age, tire choice begins with the wheel rather than assuming one old tire size automatically crosses to another.
Measure the wheel carefully and verify the existing setup before selecting a tire. Antique cars are often restored, repaired, or updated with replacement wheels over time, and that can change what size belongs on the vehicle today. Confirming rim diameter first keeps the rest of the fitment decision much more straightforward.
What does 29X4.75 mean on a 1926 Overland 91 Series?
A 29X4.75 tire uses an antique diameter-by-section format. The 29 refers to the tire's approximate overall diameter, and the 4.75 refers to its section width. That differs from later sizing systems that identify the wheel diameter at the end of the size code, such as 4.75-20.
Understanding that format matters because it changes how the tire should be interpreted during a restoration or replacement search. It is not a modern radial size, and it should not be treated like one. On a 1926 Overland 91 Series, this size should be chosen only after the wheel setup and physical fitment on the car have been verified.
Choosing the Right Tire
What should I consider when choosing a tire for a 1926 Overland 91 Series?
Start with the correct primary size for the wheel actually on the car: 29X4.75 or 4.75-20. Both are bias-ply fitments, so the decision is less about construction type and more about matching the tire to the existing rim setup, the car's vintage stance, and the type of use the vehicle will see.
Beyond size, consider whether the goal is primarily restoration appearance, occasional touring, or display use. Antique-size markings can be confusing, especially on vehicles that may have been changed over many decades. Careful wheel measurement and a close look at clearance around fenders, steering components, and suspension points will help narrow the right choice.
How do I choose between the available 1926 Overland 91 Series tire sizes?
The choice between 29X4.75 and 4.75-20 comes down to wheel configuration. They are both correct vintage-style bias-ply fitments for the 1926 Overland 91 Series, but they are not simply two names for the same tire. Each size belongs to its own older sizing convention and wheel relationship.
Check what is mounted on the car now, then confirm the rim dimensions before making a change. A previous restoration may have standardized the wheels one way or the other. Once the wheel setup is confirmed, the better choice is the size that matches the car physically and supports the appearance and road-use character you want to maintain.
What rim-fitment details matter when choosing 1926 Overland 91 Series tires?
Rim diameter is the most important detail because the 1926 Overland 91 Series uses two tire sizes tied to different wheel setups. A 4.75-20 tire belongs on a 20-inch rim, while 29X4.75 follows an older size convention that should be matched carefully to the wheel already on the car.
Wheel condition matters just as much as tire size on an antique vehicle. Before mounting new tires, inspect the rims for damage, corrosion, out-of-round condition, and prior repairs. A sound wheel helps the tire seat properly and run more consistently, which is especially important on collector cars that may spend long periods parked between drives.
Restoration & Appearance
Which tire should I choose for a period-style 1926 Overland 91 Series?
A period-style choice starts with using one of the two correct primary bias-ply sizes for the 1926 Overland 91 Series: 29X4.75 or 4.75-20. Both support the tall, narrow look associated with mid-1920s American cars, but the right one depends on the wheel setup currently fitted to the vehicle.
For a restoration-minded result, preserving the correct proportions usually matters as much as simply getting a tire onto the wheel. Confirm the rim dimensions first, then compare the tire choice against the car's stance and presentation. If exact originality is important, marque-club references and period vehicle documentation can help refine the final appearance decision.
Does correct tire fitment matter for a 1926 Overland 91 Series restoration?
Correct tire fitment matters a great deal on a 1926 Overland 91 Series because tire size strongly affects the car's overall look. Antique vehicles rely on tall sidewalls and narrow proportions, so using the proper bias-ply size helps preserve the visual balance that belongs to a car from this period.
Fitment also influences practicality. A tire that does not match the wheel properly can create mounting problems or alter the vehicle's stance in ways that look out of place. Even on a display-oriented restoration, careful size selection supports authenticity of presentation and helps the car remain usable for careful touring and event driving.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1926 Overland 91 Series?
Yes. On a 1926 Overland 91 Series, wheel changes, brake work, suspension alterations, or previous restoration choices can all affect which tire size belongs on the car today. Since this model uses two vintage bias-ply fitments, modifications can make it risky to assume the currently mounted tire is automatically the right reference.
A careful inspection should include wheel diameter, wheel condition, clearance at full steering lock, and any signs that the body or suspension has been altered. Antique cars often carry decades of accumulated changes, so verifying the present setup is more useful than relying on appearance alone when choosing replacement tires.
What should I inspect before driving a 1926 Overland 91 Series on new tires?
Inspect the wheels, valve hardware, and overall mounting condition before putting a 1926 Overland 91 Series back into road use. The tires themselves should be checked for proper seating, visible damage, and stable air retention. On an antique vehicle, the surrounding chassis condition matters almost as much as the tire fitment itself.
Steering response, brake function, and suspension condition should all be evaluated before a longer outing. A short, cautious test drive can reveal rubbing, pulling, or vibration that would be easy to miss in the garage. Collector cars that have been parked for long periods benefit from a thorough once-over before regular driving resumes.
How should tires on a collector 1926 Overland 91 Series be maintained?
Tires on a collector 1926 Overland 91 Series should be maintained with regular pressure checks, routine visual inspections, and attention to age-related deterioration. Even if tread wear is minimal, sidewall cracking, flat spotting, air loss, and damage from long storage can affect an antique car that is driven only occasionally.
Storage conditions make a real difference. Keeping the car away from prolonged sunlight, moisture, excess heat, and ozone-producing equipment helps protect the tires between drives. It also helps to move the vehicle periodically and inspect the wheels and tires before each outing, especially if the car spends extended time parked between events.
