750-18 Tire Size Guide

The 750-18 uses an older numeric sizing system. In this format, 7.50 identifies the nominal tire width in inches, and 18 identifies the wheel diameter in inches. The code does not include a separate aspect ratio figure, and it does not place the construction type into the size itself the way a modern radial size often does.

Modern P-metric sizes usually spell out width in millimeters, sidewall proportion, construction, and rim diameter all in one line. The 750-18 is more traditional and simpler, but it leaves more to the actual tire design and product choice. For an antique car or light truck, that means buyers should look beyond the size code and also review wheel width, load carrying ability, and whether they want a passenger-style tire or a heavier truck-oriented version.

The 750-18 tire fits an 18.0-inch wheel, which is 457.2 millimeters in diameter. The 18-inch figure is the wheel’s bead-seat diameter, and it must match exactly for the tire to mount correctly.

Wheel width matters along with wheel diameter. In this size, some tires are built for a 4.00-inch rim, while truck-oriented versions use rims from 6.00 to 6.50 inches, creating an overall wheel-width span of 4.00 to 6.50 inches across the size. A buyer restoring an original luxury car should not assume that every 750-18 works on the same wheel just because the bead diameter matches. Rim width changes the tire’s shape, fit, and load suitability.

The 750-18 is 7.50 inches wide by its nominal section width, which equals 190.5 millimeters. On a mounted and inflated tire, section width refers to the broadest point across the sidewalls rather than the tread itself.

Section width is the number to watch when checking fit around fenders, steering arms, leaf springs, and brake hardware. The tread that touches the road is usually narrower than the full sidewall-to-sidewall measurement, so clearance should never be judged by tread appearance alone. On antique vehicles with close front fenders or full wheel covers, a tire that is technically the right size can still create interference if the wheel width or body tolerances differ from the original setup.

Yes, 750-18 and 7.50-18 are two common ways of writing the same basic size. The decimal point is often omitted in older catalog shorthand, and the same size may also appear as 75018, 750 18, 750X18, or 7.50X18.

What matters most is that the tire still matches the correct 18-inch wheel diameter and the intended width class for the vehicle. Antique tire notation was not always printed with modern consistency, so older manuals, sidewalls, and restoration references may show minor formatting differences. When comparing options, focus on the actual dimensions, construction type, rim-width suitability, and load specification rather than assuming every alternate spelling signals a different fitment.

The 750-18 is commonly a tube-type fitment and is often set up with a tube. Antique numeric bias-ply sizes like this were frequently used on wheels and tire systems where tube use was part of the original arrangement.

Tube use is still a wheel-and-tire-system question rather than a size-only question. Rim design, the specific tire construction, and the manufacturer’s mounting guidance all need to agree before a tube is selected or omitted. On a prewar vehicle, especially one running original or restored wheels, it is wise to inspect the wheel condition carefully and confirm the correct tube, flap, and valve setup before putting the car back into regular road service.

The 750-18 spans a noticeable weight range depending on the version. Passenger-type examples run from 30 to 39 pounds, while truck-oriented versions range from 31 to 48 pounds.

Weight differences usually reflect differences in carcass design, intended service, and rim-width range rather than simple brand variation alone. A heavier 750-18 can change steering effort, suspension response, and the way an antique vehicle feels over rough pavement. For that reason, buyers should compare the tire’s intended use with the vehicle’s actual role. A large touring car, a prewar luxury sedan, and a light truck may share the same nominal size yet benefit from very different tire constructions.

Yes, the 750-18 was used in antique passenger-car and light-truck contexts, but that does not make every version interchangeable across every vehicle. This size includes passenger-style tires as well as truck-oriented tires with different wheel-width requirements and different load-and-pressure pairings.

A large prewar sedan may need the visual profile and wheel match of a passenger tire, while a working light truck may call for a more utility-focused casing. Buyers should compare the actual wheel width, body clearance, and load requirements of the vehicle before choosing within the size. Matching the size code alone is only the starting point, especially when one vintage size spans luxury cars, touring cars, and truck applications from the early 1930s.

Wheel width is one of the most important checks with the 750-18 because products in this size span from 4.00-inch rims to 6.50-inch rims. Passenger examples in this size are built around a much narrower wheel than some truck-oriented versions.

Using the wrong wheel width changes how the sidewall stands, how the tread sits on the road, and how much space the tire occupies under the fender. On an antique vehicle, those changes also affect the period look. Before mounting the 750-18, measure the actual wheel, not just the nominal tire size already on the car. Restored vehicles often carry replacement wheels, and those wheel changes can make a correct-looking tire the wrong functional match.

The 750-18 is closely associated with prewar to early postwar bias-ply fitments, so it is often a strong choice when a restoration calls for original-era construction, proportions, and visual character. Its tall sidewall and bias-ply build suit many antique passenger cars and light trucks far better than a modern low-profile substitute would.

Authenticity still depends on the exact vehicle, wheel, and service type. Some 750-18 tires are aimed at passenger-car presentation, while others are built for truck-style use. Owners preparing a judged restoration should compare original factory literature, surviving photos, and wheel specifications before deciding. Getting the right sidewall appearance, wheel width, and load rating together usually matters more than simply finding any tire that carries the correct size code.

A 750-18 bias-ply tire typically delivers the steering feel and ride character associated with antique vehicles: a tall sidewall, more sidewall flex, and a distinctly vintage response to road texture. Drivers often notice a different on-center feel and more movement in the carcass than they would with a modern radial.

Road behavior depends on more than construction alone. Suspension wear, steering-box adjustment, alignment, inflation, and the vehicle’s weight distribution all influence how a 750-18 feels at speed. On a properly sorted prewar chassis, that vintage response is part of the appeal. On a car with worn kingpins, loose steering components, or uneven weight loading, the same tire can feel far less settled and may exaggerate issues already present in the vehicle.

The 750-18 includes both passenger-style and truck-oriented tires, so road feel can vary noticeably even though the size code stays the same. Heavier truck-type constructions can bring a firmer, more utility-minded character, while passenger versions may better suit luxury-car ride expectations and period appearance.

Construction weight, wheel width, and inflation pairing all influence how the tire responds to pavement. A narrow-rim passenger setup will not behave the same way as a wider-rim truck-style setup in the same nominal size. Buyers should think about how the vehicle is actually used. A concours car, a touring antique, and a shop truck replica can all wear 750-18 tires, but they may not benefit from the same casing style or wheel arrangement.

The 750-18 can be used for road driving when the tire is in sound condition and correctly matched to the vehicle, wheel, and load requirement. Because it is a bias-ply antique size, the driving experience is best approached with expectations appropriate to an older chassis and older tire design.

Modern traffic speed, braking demands, and pavement quality place more stress on antique vehicles than the roads many of them originally saw. Before using a 750-18 regularly, inspect the age and condition of the tire, confirm the wheel is appropriate, and make sure steering and suspension components are in proper order. A fresh tire cannot compensate for weak brakes, poor alignment, cracked wheels, or excessive front-end play on a prewar car or light truck.

The 750-18 is available from Deka, Firestone, and STA. Those options cover both passenger-oriented vintage styles and more utility-focused truck designs within the same basic size.

Brand choice should be guided by the vehicle’s actual role rather than by name alone. A large antique passenger car may call for one kind of construction and sidewall presentation, while a light truck or military-style build may call for another. When comparing brands in 750-18, look at rim-width compatibility, load-and-pressure pairing, casing weight, and whether the tire’s visual style supports the level of originality or utility the vehicle is meant to show.

A quality 750-18 tire starts with the basics: accurate size, proper bias-ply construction for the intended vehicle, and a load specification that matches the job. In this size, quality also means selecting the version that suits the wheel width and service type, since passenger and truck-oriented builds differ meaningfully.

Appearance is part of quality on an antique application as well. Some 750-18 tires emphasize broad whitewall presentation, while others focus on a plain blackwall or traction-oriented look. Buyers should judge quality by how well the tire matches the vehicle’s original character, how consistently all four or five tires match one another, and whether the chosen design aligns with actual road use instead of just the visual target.

Yes, matching all four 750-18 tires in construction type, sidewall presentation, and general duty class is usually the best approach. Mixing a passenger-style tire with a truck-style version, or mixing whitewall and blackwall patterns, can change the vehicle’s appearance and produce uneven road manners.

Consistency matters on antique vehicles because the tire is such a visible part of the overall stance. A mismatched set can alter steering feel, visual balance, and how the car sits at each corner, especially when the tires differ in weight or intended service. If a spare is carried externally or displayed prominently, many restorers also prefer it to match the road tires so the complete vehicle keeps a coherent period-correct look.

The 750-18 should be stored the same way any antique bias-ply tire should be stored: away from heat, direct sunlight, standing moisture, and ozone sources such as electric motors or battery chargers. Long periods of inactivity can also contribute to flat spotting and age-related hardening even when tread depth still looks acceptable.

Collector cars that spend much of the year parked benefit from routine inspection and occasional movement. Rolling the vehicle, keeping the storage area clean and dry, and checking for cracks, bulges, and air loss help preserve the tire and catch problems early. A 750-18 may look substantial and robust, but time and environment still matter just as much as mileage on a prewar or early postwar tire setup.

The 750-18 should be inspected regularly for cracking, cuts, sidewall bulges, irregular wear, and air loss, especially before tours, shows, or longer road trips. Antique vehicles place a lot of trust in tire condition because their steering, brakes, and suspension systems are less forgiving than later designs.

Inspection should include the wheels and valve hardware, not just the tread. If the vehicle uses tubes, the full assembly matters, and a tire that looks acceptable outside can still deserve closer attention if it loses pressure or shows unusual wear. On older luxury cars and light trucks, a short local drive after a long period of storage is also a good time to feel for vibration, flat spotting, or pull that may suggest service is needed.

The 750-18 is commonly a tube-type fitment, so tube condition deserves the same attention as the tire itself. A sound outer casing does not guarantee that the inner tube, valve stem, or wheel surface is in equally good shape.

When servicing this size, inspect the wheel for rust, burrs, or damage that could affect the tube and bead area. Replacement decisions should consider the whole assembly, especially on original or restored antique wheels. If there is any doubt about the correct tube and flap arrangement, confirm it against the actual tire and wheel being used. A careful mounting setup helps prevent slow leaks, chafing, and avoidable roadside problems.

The 750-18 should be replaced when age, cracking, repeated air loss, bulges, impact damage, or other condition issues raise doubt about its serviceability, even if tread depth still appears usable. Antique tires often age out before they wear out, particularly on collector vehicles that cover limited annual mileage.

Buyers should judge roadworthiness by condition, age, and intended use together. A prewar tire that seems fine for display may not be the right choice for extended driving on modern roads. Before any longer trip, inspect the full tire-and-wheel assembly, confirm the inflation and load pairing is appropriate, and look closely at the sidewalls and bead areas. When condition is uncertain, a qualified tire professional should evaluate the assembly before further use.

Load capacity is critical with the 750-18 because this size includes several distinct ratings. Passenger-style versions are rated at 1,930 pounds at 40 psi, while truck-oriented versions in the same size are rated at 2,540 pounds at 65 psi or 2,910 pounds at 75 psi.

Those figures should be matched to the actual vehicle and how it is used, not just to the sidewall size. A large luxury sedan, a touring car, and a utility truck may all wear 750-18 tires but place different demands on the casing. Buyers should confirm axle loads, wheel suitability, and intended road use before selecting among the available versions, since choosing by appearance alone can overlook an important part of safe service.

The most important checks before driving on the 750-18 are tire condition, correct wheel diameter, wheel-width suitability, air retention, and proper load matching for the specific tire version. Because this size is often used with tubes, the condition of the tube, valve hardware, and wheel itself also matters.

Before heading onto modern roads, inspect for weather cracking, cuts, bulges, or uneven wear and make sure the 18-inch wheel is the correct match for the tire. Confirm that the chosen tire suits the vehicle’s wheel width within the 4.00 to 6.50 inch span seen in this size. Antique vehicles deserve especially careful pre-trip inspection because tire behavior is only one part of a larger system that includes older brakes, steering, suspension, and wheel hardware.