1100-20 Tire Size Guide

The 1100-20 is a numeric bias-ply size in which the first number identifies the nominal section width in inches and the number after the dash identifies the wheel diameter. In practical terms, 11.00 means an 11-inch nominal width and 20 means the tire fits a 20-inch wheel.

Older numeric sizes like the 1100-20 do not present as much information in the code as a modern P-metric radial does. You do not get a separate aspect ratio, construction letter, or service description in the size itself, so buyers need to read the actual sidewall markings and product specifications closely. For antique and early truck applications, that matters because appearance, profile, wheel fit, and load needs all have to be judged from the complete tire and wheel combination.

The 1100-20 tire fits a 20.0-inch wheel, which is 508.0 millimeters in diameter. That wheel diameter must match exactly, because a tire built for a 20-inch rim will not seat correctly on any other bead diameter.

Wheel width matters as well as wheel diameter. The 1100-20 seats on rims from 8.00 to 8.50 inches wide, and staying within that span helps the casing hold the intended profile. A wheel that is too narrow can pinch the tire and change its shape, while a wheel that is too wide can flatten the sidewall and affect clearance. Antique vehicle owners should confirm both dimensions before mounting, especially when wheels may have been changed at some point in the vehicle’s life.

The 1100-20 tire has a section width of 11.0 inches, which equals 279.4 millimeters. Section width measures the tire at its widest point from sidewall to sidewall, not across the tread face.

Clearance checks should be based on section width rather than tread width, because the sidewall bulge is often the first place a tire gets close to suspension arms, inner fenders, or bodywork. On antique cars and light trucks, wheel offset and rim width can change how much space is really available even when the nominal tire size stays the same. Buyers comparing old fitments should always measure the vehicle and not rely only on the size code.

The 1100-20 and 11.00-20 refer to the same basic tire size. The difference is mostly notation: one version drops the decimal point, while the other writes the width in a more explicit 11.00-inch format.

Similar-looking aliases can still create confusion when searching across older catalogs, military applications, and collector parts records. Variants such as 1100X20 or 11.00X20 usually point to the same general size family, but buyers should still compare the actual wheel diameter, intended use, and construction type shown on the tire. On antique and truck-style fitments, small notation differences do not change the need to verify load requirements and wheel compatibility before installation.

The 1100-20 is commonly a tube-type fitment and is often set up with a tube. Tube use is still a wheel-and-tire-system question rather than a size question alone, so it should be confirmed against the actual wheel and tire being used.

Many antique and early truck wheels were designed around tube-type service, and wheel condition becomes especially important on an older rim. Rust at the bead area, riveted wheel construction, and the style of the wheel center can all influence whether a tube and flap are appropriate. Before mounting a 1100-20, inspect the wheel carefully and verify the correct internal components with a qualified tire professional who is familiar with vintage applications.

The 1100-20 tire weighs 93 pounds in the available Military & Truck configuration. That is the weight of one tire by itself, not the tire and wheel assembly together.

A tire in this weight range is part of a substantial vintage truck-style assembly, so handling and mounting are not small-car tasks. Heavier tires add unsprung weight, which can influence steering effort, suspension response, and the amount of care needed during service. Anyone replacing a full set should also consider the vehicle’s wheels, spare-mount arrangement, and lifting equipment, because an antique-size casing like the 1100-20 is much more demanding to move and mount than a modern passenger-car radial.

The 1100-20 is associated with antique and prewar to early postwar passenger cars and light trucks that used large inch-based bias-ply tires. It belongs to the vintage numeric sizing era, where tall sidewalls and substantial overall proportions were normal parts of the original look and stance.

Fitment should be treated as a starting point rather than an automatic match. Vehicles from that period can differ in wheel width, body clearance, brake conversion history, and how much room is available at full steering lock or full suspension travel. When researching the 1100-20, compare your wheel dimensions, original documentation, and actual tire-to-body clearance. Antique trucks and heavy service vehicles especially need a careful review of load requirements before assuming the size is appropriate.

The 1100-20 requires a 20-inch wheel, but that does not mean it fits every 20-inch wheel. Wheel width, bead-seat design, condition, and the intended tire type all affect whether the assembly is appropriate.

For this size, rim width should fall between 8.00 and 8.50 inches. Staying inside that range helps preserve the tire’s intended shape and reduces the chance of sidewall distortion. Buyers should also confirm the wheel’s construction and serviceability, especially on older multi-piece or vintage truck wheels that may have age-related issues. Matching diameter alone is never enough with a large antique bias-ply fitment like the 1100-20.

The 1100-20 is often a strong period-correct choice when the vehicle originally used a large numeric bias-ply tire from the prewar or early postwar era. Bias-ply construction better preserves the tall sidewall profile and authentic visual character expected on many antique restorations.

Restoration accuracy still depends on more than the size code alone. Wheel width, body style, load needs, and how the vehicle is judged all matter, and some antique vehicles had application-specific tire requirements. Owners pursuing authenticity should compare original literature, surviving examples, and wheel specifications before selecting a set. A correct-looking tire that is wrong for the wheel or vehicle weight can still create fitment and drivability problems.

The 1100-20 uses bias-ply construction, so it generally delivers a more vintage driving feel than a modern radial. Expect more sidewall movement, more sensitivity to road crown and grooves, and a steering character that reflects the way antique cars and trucks originally behaved.

Driver expectations should match the age and design of the vehicle. Suspension wear, alignment settings, wheel condition, inflation, and load all influence how a bias-ply tire behaves on the road. A well-sorted antique vehicle can feel stable and satisfying on the correct tire, but it will not mimic the tracking and response of a later radial-equipped vehicle. Buyers choosing the 1100-20 usually do so because the period driving feel is part of the ownership experience.

The 1100-20’s tall bias-ply profile tends to deliver a substantial, old-style ride character rather than the more settled feel of a modern radial. On the right antique application, that profile contributes to the visual stance and road behavior expected from prewar and early postwar vehicles.

Ride quality depends heavily on the vehicle carrying it. Wheelbase, spring rates, shock condition, seat design, and vehicle weight all shape the final result, especially on older chassis. A large tire can add cushioning over broken pavement, yet bias-ply construction may also transmit wander or tracking characteristics that modern drivers are less used to. Owners should think of the 1100-20 as part of a complete vintage system rather than as an isolated comfort upgrade.

Yes, the 1100-20 can have a noticeable effect on steering feel and handling because it is a wide, heavy bias-ply size with a tall sidewall. Steering effort, turn-in response, and straight-line tracking will reflect both the tire’s construction and the condition of the vehicle underneath it.

Front-end wear, alignment, kingpins, bushings, and steering box adjustment matter as much as the tire itself on antique applications. A large bias-ply casing can feel entirely different on a carefully rebuilt chassis than it does on a vehicle with worn suspension parts. Before judging the tire alone, owners should consider the complete wheel-and-suspension setup, because many drivability complaints on vintage vehicles come from system condition rather than from the size designation.

STA is available in the 1100-20 size. For a specialty antique and truck-oriented fitment like this, brand choice is usually less about broad variety and more about finding the correct construction, dimensions, and load capability for the vehicle.

Selection should start with how the tire will be used. On a large numeric bias-ply size, buyers should compare wheel compatibility, sidewall appearance, load rating, and whether the tire supports the intended restoration or service role. It also helps to keep the full set consistent, because mixing different constructions or casing styles on an antique vehicle can change appearance and driving behavior in ways that are more noticeable than many owners expect.

A quality 1100-20 tire should match the vehicle’s intended role in construction, dimensions, and load capability before anything else. Because this is a vintage numeric bias-ply size, buyers should pay close attention to wheel fit, casing type, and whether the tire suits an antique passenger or light-truck style application.

Good selection also means looking beyond tread alone. Check the tire’s sidewall markings, overall build consistency, and whether the tire’s service description aligns with the weight and speed expectations of the vehicle. For an antique restoration, visual proportion matters because a large bias-ply tire contributes heavily to stance and authenticity. For working or display vehicles, durability and proper load support may matter even more than cosmetic details.

Yes, matching all four 1100-20 tires is usually the best practice. Keeping the same size, construction type, tread family, and general sidewall appearance across the set helps preserve balanced handling and a consistent period look.

Mixed tires can create uneven behavior on older vehicles, especially when bias-ply casings are involved. Differences in carcass stiffness, tread pattern, or overall dimensions can change steering feel and how the vehicle tracks on the road. A uniform set also matters visually on antique restorations, where tire proportion is a major part of the finished stance. If one tire must be replaced temporarily, owners should compare it closely to the others in both dimensions and service rating.

The 1100-20 should be stored the same way any large antique bias-ply tire should be stored: clean, dry, and away from sunlight, electric motors, ozone sources, and prolonged heat. If the vehicle sits for long periods, regular inspections are just as important as careful storage conditions.

Collector vehicles often accumulate little mileage, but time still affects rubber, cords, and tube-type assemblies. Owners should watch for sidewall cracking, flat spotting, air loss, and changes in casing shape, especially after seasonal storage. Moving the vehicle occasionally and maintaining the correct inflation for its actual use can help reduce stress on the tire. Large vintage tires also deserve a close inspection before the first drive of the season, not just before major events.

The 1100-20 should be inspected before regular road use, after long storage periods, and before any extended trip. Look for cracking, bulges, cuts, irregular wear, loose valve hardware, and any sign that the tire is losing air or changing shape.

Inspection matters even more on antique-size bias-ply tires because many vehicles using them are older, heavier in feel, and less forgiving of tire-related problems. Wheel condition should be checked at the same time, especially if the assembly uses a tube and the rim has seen years of service. Early attention to visible aging or air loss can prevent bigger issues and helps owners decide when a tire needs professional evaluation rather than another season of casual use.

The 1100-20 is commonly a tube-type fitment, but tube service should still be confirmed from the actual tire and wheel being used. The wheel design, the condition of the rim, and the tire manufacturer’s guidance all matter more than the size code by itself.

Older wheels may require more than just a tube. Depending on the wheel and application, buyers may also need to consider the correct valve setup and whether additional internal components are appropriate for the assembly. Antique truck-style rims deserve especially careful inspection for rust, distortion, or sealing problems before mounting. When there is any doubt, a tire professional familiar with vintage tube-type service is the right source for final confirmation.

The 1100-20 should be replaced when age, cracking, bulges, air loss, or structural changes suggest the tire is no longer trustworthy, even if the tread depth still looks usable. Antique and low-mileage vehicles can hide tire aging because time and storage conditions often matter more than miles driven.

Visible tread is only one part of the story on a vintage bias-ply tire. Sidewall condition, bead area health, tube-related issues, and the way the tire holds its shape are all important signs. Before any serious road use, inspect the tire closely and review its current sidewall markings. If there is uncertainty about age or condition, a qualified tire professional should evaluate it rather than relying on appearance alone.

The available 1100-20 Military & Truck tire is rated at 5920 pounds at 85 psi per tire. Buyers should verify that this rating matches the vehicle’s actual axle loads and intended use rather than assuming every antique application needs the same specification.

Load capacity always needs to be considered as part of the complete vehicle system. Wheel condition, suspension setup, cargo expectations, and the way the vehicle is driven all affect whether a given tire is appropriate. Heavy vintage service vehicles, support trucks, and display vehicles can have very different real-world demands even when they use the same nominal size. Matching the tire’s rated load to the application is more important than choosing by size alone.

The most important checks before driving on the 1100-20 are tire condition, inflation, wheel integrity, and visible signs of aging or damage. Buyers should also confirm that the tire is mounted on the correct 20-inch wheel and that the rim width falls within the 8.00 to 8.50 inch range.

Large antique bias-ply tires deserve a slower, more deliberate inspection routine than many modern drivers are used to. Check for cracking, exposed cords, cuts, looseness at the valve area, and any indication that the wheel itself may be compromised. Tube-type service adds another reason to watch for air loss and heat buildup on longer drives. Before road use, especially after storage, make sure the entire wheel-and-tire assembly is ready for the vehicle’s weight and intended speed.