An airplane tire can be about 15 inches or more than 50 inches in diameter, depending on the aircraft and its landing gear. A small private plane may use tires that look similar in size to car tires, while a large airliner needs much larger, highly pressurized tires to support its weight during takeoff, landing, and taxiing. The exact dimensions vary by aircraft model and tire position. Here’s how airplane tire sizes compare and what those measurements mean.
How Big Is an Airplane Tire?
There is no single standard airplane tire size. Small general aviation aircraft may use tires roughly 15 to 20 inches in diameter. Tires on common passenger jets are often around 25 to 35 inches across, while some widebody airliners use tires roughly 40 to 56 inches in diameter.
Those figures are approximate. A plane’s main landing gear and nose gear often use different tires, and some aircraft have more than one main-gear tire size. Tire dimensions also depend on the aircraft version, wheel design, approved tire manufacturer, and replacement specification.
For scale, a 27-inch tire is a little over 2 feet tall, while a 56-inch tire is about 4 feet 8 inches in diameter. Large airliner tires can therefore approach the height of an adult, although many familiar passenger jets use tires considerably smaller than the largest examples.
Typical Airplane Tire Sizes by Aircraft Type
The following ranges offer a general comparison, not a maintenance specification. Aircraft operators must use the tire sizes and part numbers approved for the specific airplane and wheel assembly.
| Aircraft category | Approximate tire diameter | Typical use |
|---|---|---|
| Small training and private aircraft | About 15–20 inches | Light aircraft with relatively low operating weights |
| Regional and narrowbody jets | About 25–35 inches | Short- and medium-haul passenger service |
| Large widebody airliners | About 40–56 inches | Heavy long-haul aircraft, depending on gear position |
These categories overlap. The main gear usually carries most of an aircraft’s weight, so its tires may be larger or more numerous than the tires on the nose gear. Some aircraft distribute their weight across several landing-gear assemblies, each with multiple wheels.
Examples on Passenger Airliners
Common aircraft offer useful reference points, but a model name alone does not identify one universal tire size. Different versions and approved tire options can have different specifications. For example, published tire-size listings commonly place Boeing 737-family main tires in the high-20-inch range, while large widebody aircraft can use main tires around 50 inches or larger.
Aircraft such as the Airbus A320 and Boeing 737 use multiple wheels on their main landing gear and separate nose-gear tires. Larger aircraft, including the Boeing 777 and Airbus A380, have more extensive landing-gear arrangements to spread their greater weight across more tires. The largest tire fitted to an aircraft may be on a main landing gear, but that depends on the specific design.
These examples are best treated as broad comparisons, not exact figures for every aircraft in a family. For a precise measurement, the aircraft’s maintenance documentation or the tire manufacturer’s data should be checked for the exact aircraft variant, gear location, and tire part number.
What Airplane Tire Measurements Mean
Aircraft tires are identified using standardized markings that can include nominal outside diameter, tire width, rim diameter, construction type, and other information. A marking might look like 27 × 7.75–15: in a common format, the first number refers to approximate outside diameter in inches, the second to approximate section width, and the last to the wheel-rim diameter. The exact format can vary, so the tire’s data and applicable documentation take priority.
- Outside diameter: The tire’s approximate height when mounted and inflated to the specified condition.
- Section width: The tire’s approximate width at its widest point.
- Rim diameter: The diameter of the wheel on which the tire is installed.
- Construction and rating markings: Information used to identify how the tire is built and its approved operating limits.
A tire’s listed dimensions are not necessarily its exact measurements in every condition. Inflation pressure, load, temperature, and measurement method can affect the shape and dimensions in service. Aircraft tires are also designed for specific wheels and operating conditions; a similar-looking tire is not automatically an approved substitute.
Why Airplane Tires Are So Large and Strong
Airplane tires must support substantial loads while tolerating high-speed ground operations. During takeoff, a jet’s tires accelerate rapidly as the aircraft gains speed. At landing, they make contact with the runway and must support the aircraft while braking, steering, and taxiing follow. Their size and construction are selected to meet the aircraft’s certified design and operating requirements.
Tire size alone does not determine how much weight a wheel can support. Load rating, inflation pressure, wheel design, number of tires, and the way weight is distributed across the landing gear all matter. A large airplane may use many tires to share its weight rather than relying on a small number of exceptionally large ones.
Aircraft tires also have relatively thick, reinforced construction compared with many road-vehicle tires. They are designed to withstand demanding landing loads and repeated cycles of inflation, heating, and cooling. Operators follow maintenance procedures to inspect tires, monitor pressure, and determine when a tire needs service or replacement.
How Much Pressure Is in an Airplane Tire?
Airplane tire pressure varies by aircraft, wheel position, tire specification, and operating condition. Many commercial aircraft tires operate at pressures measured in hundreds of pounds per square inch, but there is no single pressure that applies to all airplane tires. The correct value comes from the aircraft and tire maintenance instructions.
Pressure is critical because underinflation or overinflation can affect tire performance and wear. Maintenance staff use approved procedures and equipment to check pressure, generally accounting for the specified inspection conditions. A passenger should not infer an airplane tire’s pressure from its appearance or compare it directly with a car tire’s pressure.
How Much Does an Airplane Tire Weigh?
Weight depends on tire size, construction, and whether the quoted figure includes only the tire or a tire-and-wheel assembly. Smaller aircraft tires can be comparatively light, while large commercial-aircraft tires may weigh many tens of pounds or more. The complete wheel assembly adds weight because it includes the wheel and associated components.
For that reason, a single “airplane tire weight” figure can be misleading. The tire manufacturer’s specification provides the relevant weight for a particular product, while aircraft documentation identifies the approved assembly. In aviation maintenance, fit and certification matter more than a general comparison.
Airplane Tires Compared With Car and Truck Tires
Most small airplane tires are closer in diameter to passenger-car tires than to the biggest airliner tires. Yet size is only one difference. Aircraft tires are built for aviation landing loads, high ground speeds, and the wheel assemblies specified for particular aircraft. They are not interchangeable with automotive tires, even if their dimensions seem similar.
Large airliner tires may be wider and taller than a typical car tire, but an aircraft’s landing-gear design also relies on multiple wheels and specific load ratings. A truck tire may look robust, but it is made for a different vehicle, wheel, and operating environment. Appearance and nominal dimensions are not enough to establish compatibility.
What Determines the Right Tire Size?
Engineers and aircraft manufacturers select tire specifications as part of the landing-gear system. Important factors include the aircraft’s weight, gear layout, wheel size, runway performance requirements, braking and steering arrangements, and the loads expected during takeoff and landing.
The main landing gear typically bears most of the aircraft’s weight, while the nose gear supports and guides the forward section. The size and number of tires must work with the aircraft’s certified design. A replacement must match the approved specification, not merely the original tire’s apparent diameter or width.
Aircraft operators and maintenance technicians consult approved manuals and manufacturer data when selecting, inspecting, and replacing tires. The Federal Aviation Administration’s guidance on aircraft tire maintenance emphasizes following applicable instructions and using suitable inspection and servicing practices.
Quick Facts About Airplane Tire Size
- Small private-plane tires may be roughly 15–20 inches in diameter.
- Many regional and narrowbody jet tires fall broadly in the 25–35-inch range, depending on the aircraft and gear position.
- Some large widebody aircraft use tires roughly 40–56 inches in diameter.
- Main-gear and nose-gear tires can differ in size.
- Exact dimensions, pressure, and load limits must be confirmed using approved aircraft and tire documentation.
Sources and Further Information
For authoritative maintenance and product details, consult the aircraft manufacturer’s maintenance documentation and the tire maker’s specification for the exact tire. The FAA provides general maintenance guidance in Advisory Circular 20-97B, Aircraft Tire Maintenance and Operational Practices. Tire manufacturers such as Goodyear Aviation and Michelin Aircraft also publish aviation tire information and product resources.