28X4.75 Tire Size Guide

The 28X4.75 code identifies a flotation-style tire size. In this case, 28 is the tire's overall outside diameter in inches, and 4.75 is the section width in inches. The wheel diameter for this size is 5 inches, so the full fitment picture is a tire about 28 inches tall and 4.75 inches wide that mounts on a 5-inch rim.

Unlike a modern P-metric code, the 28X4.75 format does not directly spell out an aspect ratio or service class. It is a more straightforward older-style sizing system built around overall diameter and width, which is why buyers should pay close attention to wheel diameter, physical clearance, and the tire's bias-ply construction when comparing it with any substitute.

The 28X4.75 fits a 5.0-inch wheel diameter, which is 127.0 millimeters. With flotation sizing, that point matters because the first number in the code refers to tire height, not wheel size, so the correct rim diameter has to be confirmed separately from the width and overall diameter figures.

Wheel diameter must match exactly at the bead seat or the tire will not mount correctly. On older vehicles, it is also smart to confirm the wheel itself is the proper type and in sound condition, since antique rims can vary by design and age. A tire in this size should never be selected by outside diameter alone.

The 28X4.75 is about 4.7 inches wide in section width, which is approximately 119.4 millimeters. Section width measures the tire at its widest point from sidewall to sidewall after inflation, not the width of the tread that actually contacts the road.

Section width is the number to watch when checking fit around fenders, brake parts, steering arms, and suspension components. Tread width is usually narrower, so using tread width as your only comparison can lead to clearance surprises. On antique vehicles with tight wheelhouses and older wheel designs, that difference is especially important.

The 28X4.75 has an overall diameter of 28.0 inches, or about 711.2 millimeters. That figure is the full outside height of the tire when measured from the ground to the top through the centerline of the mounted and inflated tire.

Overall diameter affects more than appearance. It changes ride height, wheel-opening fill, and the way the car sits visually, and it also influences speedometer and gearing feel compared with a shorter or taller substitute. On early vehicles, a small diameter change can alter the period look enough to be noticeable even before the car moves.

The outside diameter of the 28X4.75 is 28.0 inches. In millimeters, that comes to about 711.2 mm, and in this flotation format the first number in the size code is meant to identify that outside height directly.

Outside diameter is one of the most useful comparison points when you are evaluating replacement options. A change there can affect body-to-tire proportion, road speed versus engine speed, and the amount of visible tire in the wheel opening. For antique restorations, diameter is often one of the first details owners try to preserve.

The 28X4.75 turns about 720.3 revolutions per mile. That number comes from the tire's approximate 87.96-inch circumference and tells you how many full rotations the tire makes to cover one mile of travel.

Revolutions per mile become useful when comparing this size to a substitute. A tire with fewer revolutions per mile is effectively taller, while one with more revolutions per mile is effectively shorter. On vintage vehicles, that can influence indicated speed and the way the car feels on the road, even if the width looks similar.

The 28X4.75 is very much tied to antique-era fitment, especially for vehicles from the late 1920s through early 1930s. Its narrow proportions, tall overall diameter, and bias-ply construction suit restorations where owners want the vehicle to retain the stance and visual character expected from that period.

Restoration accuracy still depends on the exact vehicle, wheel, and trim level rather than the size code alone. A car being judged for originality may require close comparison with factory documentation, surviving examples, and wheel details. For a driver-quality restoration, the main checks are correct 5-inch wheel diameter, clearance, and the overall profile you want to preserve.

The 28X4.75 may be appropriate for some vehicles that originally used a close antique-era size, but similar-looking codes should never be treated as automatic interchange. Overall diameter, section width, wheel diameter, and wheel design all matter, especially on early cars where tire and rim standards were not as uniform as later passenger-car sizing.

Buyers should compare the actual wheel diameter first, then confirm the tire's outside height and width against the vehicle's original specifications and available clearance. Steering lock, fender shape, brake hardware, and suspension travel can all affect fitment. On prewar vehicles, a careful physical check is often more important than assuming two old sizes are effectively the same.

Wheel condition matters with the 28X4.75 because this is an antique-style 5-inch rim fitment, and the tire can only perform as intended if the rim is straight, structurally sound, and correct at the bead seat. Age, corrosion, previous repairs, and mismatched wheel parts can all create mounting and running issues.

Before installation, inspect the wheel for damage, rust scale, cracks, and distortion, and make sure the bead area is clean and properly shaped. Early vehicles can also have wheels that have been swapped over the decades, so visual similarity is not enough. Confirming the actual wheel specification helps prevent fitment problems that the tire size code alone cannot reveal.

The 28X4.75 is a bias-ply size, so it typically delivers a more traditional vintage driving feel than a modern radial. Bias-ply construction usually brings more sidewall movement, more road feel, and a different response to grooves and pavement texture than drivers accustomed to later radial passenger tires may expect.

Steering feel, straight-line tracking, and ride behavior also depend on alignment, suspension condition, wheel condition, and tire age. On an antique vehicle that is correctly set up, those traits are part of the period experience rather than a defect. Drivers moving from modern cars into early machinery should allow for slower responses and a more deliberate feel at the wheel.

The 28X4.75 can influence both ride comfort and steering feel because its tall overall diameter and narrow bias-ply profile behave differently from lower-profile modern tires. A tire with this shape tends to cushion road irregularities differently and often gives the steering a more vintage character rather than the crisp reaction most drivers associate with modern radial setups.

Ride quality is not determined by tire size alone. Spring rates, steering components, shock condition, inflation, and the condition of the road surface all contribute to what the driver feels. On a properly restored antique car, the point is usually to preserve the original character of the chassis rather than to mimic the behavior of a later vehicle.

Using the 28X4.75 on today's roads means understanding that it is an antique-style bias-ply tire size with driving manners different from modern replacement radials. It may be entirely appropriate for vintage use, but braking feel, cornering response, and lane-tracking behavior can vary significantly depending on the vehicle and how well the chassis is sorted.

Before longer drives, inspect the tires carefully, confirm wheel condition, and make sure the car's steering and suspension are in good order. Modern traffic speeds and road surfaces place demands on old vehicles that go beyond tire size alone. Sensible route planning and realistic expectations are part of using an antique-size tire responsibly in present-day conditions.

A quality 28X4.75 tire should first be judged by correct size interpretation, sound construction, and consistency with the vehicle's intended use. Because this is a bias-ply antique-style size, buyers usually care about proper overall proportions, stable bead fit on the correct wheel, and a carcass design that suits the character of the vehicle being restored or driven.

Quality also means looking at the tire as part of a complete set rather than as a single replacement. Matching construction type, dimensions, and appearance across all four tires helps the vehicle sit evenly and behave more predictably. On an early car, a tire that is technically close but visually or structurally inconsistent can still feel out of place.

Bias-ply construction is a major part of what defines the 28X4.75. For many antique and classic restorations, bias ply is the construction that most closely matches the original look, profile, and driving character expected from vehicles of the late 1920s and early 1930s.

Construction choice affects more than authenticity. It changes sidewall flex, steering response, and the way the tire presents itself visually in the wheel opening. Buyers who want the vehicle to feel and look right for its era often place as much value on that construction style as they do on the size numbers themselves.

Full-set consistency matters with the 28X4.75 because antique vehicles are sensitive to differences in tire height, carcass behavior, and wear pattern. Mixing tires that are close in name but different in actual dimensions or construction can change stance, steering feel, and the way the car settles on its suspension.

Owners restoring an early vehicle usually get the best result by keeping all four tires matched in size, construction type, and general appearance. A consistent set helps preserve the period look from corner to corner and reduces surprises in road behavior. Even on a lightly driven collector car, mismatched tires can be noticeable in both appearance and feel.

The 28X4.75 can age out before it wears out if the vehicle is driven only occasionally. Low mileage does not stop rubber from hardening over time, and antique-use tires can still develop cracking, flat spotting, internal deterioration, or loss of flexibility even when the tread looks serviceable.

Storage conditions have a big effect on longevity. Keep the vehicle away from heat, direct sunlight, standing moisture, and ozone sources such as electric motors or battery chargers. Regular inspection is just as important as mileage tracking, and any signs of sidewall cracking, bulges, air loss, or abnormal wear should be taken seriously.

The 28X4.75 should be inspected for visible cracking, cuts, bulges, uneven wear, and air loss before the vehicle goes back on the road. On an antique car, it is also wise to look closely at wheel condition, bead seating, and any signs that the tire has shifted, settled unevenly, or developed age-related stiffness.

A short visual check before each drive can catch problems early, especially on collector vehicles that sit for extended periods. Pay attention to how the tire looks after the first few miles as well, since old chassis components and old roads can reveal issues that are not obvious in the garage. If anything looks questionable, have the assembly examined professionally.

The best maintenance habits for the 28X4.75 are keeping the tires properly inflated for the vehicle's application, checking for air loss regularly, and watching for uneven wear that could point to alignment or suspension issues. Bias-ply tires especially benefit from being exercised periodically rather than sitting in one position for very long intervals.

When the car is stored, move it occasionally if practical and keep it in a cool, dry environment away from sunlight. During the driving season, inspect the tread and sidewalls before longer outings and after rough-road use. Good maintenance is less about chasing mileage and more about preserving condition, shape, and dependable operation over time.

The 28X4.75 should be replaced when age or condition raises concerns, even if the tread depth still appears usable. Cracking, bulges, recurring air loss, exposed cord, impact damage, or a hardened sidewall are all stronger replacement signals than tread alone on an antique-size tire that may spend part of its life in storage.

Age-related deterioration can matter as much as wear on collector vehicles. A tire that looks acceptable from a distance may no longer be suitable for road use if the rubber has lost flexibility or the structure has been compromised. Before tours or longer trips, inspect every tire closely and replace any assembly that does not inspire confidence.

The 28X4.75 can be used on modern roads when the tire is in sound condition and the vehicle itself is properly sorted, but buyers should approach it as an antique-style bias-ply fitment rather than a modern all-purpose replacement. The vehicle's brakes, suspension, steering, wheel condition, and intended speed all influence whether the setup is appropriate.

Modern road use is a system question, not a size-code question alone. Review the tire's current sidewall markings, verify that the wheel diameter is the correct 5 inches, and inspect the chassis before regular driving. Antique vehicles can be rewarding on present-day roads, but they should be driven within the limits of their design and condition.

Before using the 28X4.75 on a trip, check the tires for cracking, cuts, bulges, air loss, and uneven wear, then confirm the wheels are sound and the beads are seated correctly. Because this size uses a 5-inch rim and an antique-style bias-ply construction, the tire and wheel need to be treated as one working assembly.

Trip preparation should also include a quick review of steering play, suspension condition, and how the car tracks at lower speeds before committing to a longer run. Early warning signs often show up as vibration, pull, wandering, or repeated pressure loss. If there is any doubt about the wheel-and-tire system, a qualified tire professional should inspect it first.