1949 Morris Oxford Tires

The 1949 Morris Oxford uses two applicable tire sizes: 550-15 in bias-ply construction and 155R15 in radial construction. Both sizes are tied to the Oxford MO and both use a 15-inch rim diameter, so the fitment question is less about model identification and more about choosing the construction and wheel-width range that matches the car.

A buyer deciding between these sizes should first confirm the wheels actually on the car. The 550-15 bias-ply tire is intended for narrower wheels than the 155R15 radial choices, so an Oxford that has been updated over time may point naturally toward one fitment path or the other.

The 1949 Morris Oxford uses a 15-inch rim diameter for both of its applicable tire sizes. That means either the 550-15 bias-ply size or the 155R15 radial size stays within the same wheel diameter, even though the two constructions follow different sizing systems and different wheel-width expectations.

Rim diameter is only part of the fitment picture, so wheel width still needs to be checked before choosing a tire. The available 550-15 bias-ply option is suited to a narrower rim range than the radial products in 155R15, which can affect whether a traditional or updated setup makes more sense.

550-15 is a vintage numeric bias-ply size. The 550 portion represents an approximate 5.50-inch nominal section width, and the 15 identifies the wheel diameter in inches. On a 1949 Morris Oxford, that size reflects the older bias-ply sizing system rather than the later metric radial format used by 155R15.

That difference matters because a 550-15 tire brings both a distinct look and a distinct wheel-width requirement. Anyone comparing it to a radial alternative should treat 155R15 or 560R15 as comparison points rather than automatic substitutions, then verify wheel width, tire dimensions, and clearance on the actual car.

On the 1949 Morris Oxford, 550-15 is the bias-ply fitment. It uses the older numeric sizing format and is available here in a blackwall Excelsior Bias Ply tire, making it the traditional construction choice for owners who want the car to retain an earlier postwar tire presentation.

Bias-ply selection is usually tied to appearance goals, wheel width, and the desire to keep the car in a more period-style configuration. Since the Oxford also has a radial-size path in 155R15, it helps to confirm whether the wheels on the car are still set up for the narrower bias-ply tire before making a final choice.

The radial equivalents associated with 550-15 are 155R15 and 560R15. The 155R15 is the 80-series metric radial equivalent, while 560R15 is the bias-look radial equivalent. Those two options give Morris Oxford owners a choice between a standard Euro-metric radial format and a radial intended to keep a more vintage-looking tire profile.

A recommended 4-5 inch rim-width range is tied to these equivalents, which makes wheel compatibility an important part of the decision. Even when the rim diameter matches, equivalent sizing should still be checked against the Oxford’s wheel width, tire clearance, and the way the car is set up for road use.

Start by confirming the wheel diameter and width on the car, then compare them with the radial size being considered. For a 1949 Morris Oxford moving away from 550-15 bias-ply, the recognized radial alternatives are 155R15 and 560R15, and the associated rim-width guidance for the equivalent setup is 4-5 inches.

The next checks should focus on real-world fitment. Steering clearance, fender clearance, suspension condition, and the overall dimensions of the new tire all matter, especially on an older vehicle that may have seen repairs or modifications over time. That verification matters more than assuming equal rim diameter means equal fit.

The first decision is whether the car should use the 550-15 bias-ply size or the 155R15 radial size. Both belong on a 15-inch rim, but they serve different goals: the bias-ply option leans toward traditional presentation, while the radial size opens up a much broader range of available products and tire series.

After size and construction, compare wheel-width compatibility, intended use, and the type of driving the Oxford will actually see. A lightly used restoration may point one way, while a car that spends more time on the road may point another. Brand, tire series, and load details can help narrow the final choice.

Tire choices for the 1949 Morris Oxford include Firestone, Michelin, Avon, Vredestein, and Excelsior. The radial 155R15 size carries the widest brand spread, while the 550-15 bias-ply fitment is represented by Excelsior. That split reflects the broader modern product variety available in the radial size.

Brand choice should come after confirming the correct size and construction for the car. Once that is settled, compare each brand’s available tire series, rim-width specification, sidewall treatment, and other product details to see which one best matches the Oxford’s wheel setup, appearance goals, and expected driving use.

The 1949 Morris Oxford has several tire series available depending on size and construction. In 155R15 radial, choices include Firestone F560 Radial, Michelin X, Michelin XAS, Michelin XAS-FF, Avon CR6ZZ, Vredestein Snow Classic, and Vredestein Sprint Classic. In 550-15 bias-ply, the available series is Excelsior Bias Ply.

Series names help separate a basic size match from the kind of tire presentation or specification a buyer may prefer. Once the Oxford’s wheel width and construction path are confirmed, comparing series is a useful way to sort between traditional bias-ply character and the broader radial assortment offered in the metric fitment.

For a period-style 1949 Morris Oxford, the 550-15 bias-ply size is the clearest starting point because it preserves the vintage numeric format and traditional bias-ply construction associated with cars of this era. That makes it especially relevant for owners who want the car’s stance and tire presentation to stay visually rooted in the late 1940s.

A restoration-oriented choice should still account for the wheels currently on the car and how closely the build is intended to follow period practice. When strict originality matters, marque references and restoration documentation are worth checking, since a period-style tire and an exact historical match are not always the same thing.

Tire construction changes the look of a restored 1949 Morris Oxford more than many buyers expect. A 550-15 bias-ply tire keeps the car in a traditional vintage format, while a 155R15 radial introduces a later-style metric designation and a more modern construction, even though both remain blackwall options on a 15-inch rim.

That means construction choice is not only about road feel but also about the visual language of the restoration. Owners aiming for a more traditional postwar presentation often begin with the bias-ply size, while those wanting a vintage-friendly look with radial construction may also consider a bias-look radial equivalent after checking fitment carefully.

Yes, modifications can change what works on a 1949 Morris Oxford even when the nominal tire size looks correct. Aftermarket wheels, altered wheel width, suspension changes, brake conversions, or body repairs can all influence whether a 550-15 bias-ply or 155R15 radial remains a sensible fitment on the car.

That is especially important on older vehicles that may have passed through several owners over the decades. Measuring the actual wheel width, checking steering and fender clearance, and comparing the current setup against the intended tire construction will usually tell more than relying on a model-year fitment alone.

Before road use, inspect the wheels, lug hardware, valve stems or tubes as applicable, and the general condition of the suspension and steering. On a 1949 Morris Oxford, it also makes sense to confirm that the installed tire size matches the wheel width and that the tires have adequate clearance through steering movement and suspension travel.

A short test drive should follow a pressure check and a visual review for rubbing, air loss, or unusual stance. Collector cars that spend long periods parked also deserve a close look for cracking, bulges, or age-related deterioration elsewhere on the car, since a fresh tire cannot correct unrelated chassis or wheel issues.

Tires on a collector 1949 Morris Oxford should be kept clean, properly inflated, and inspected regularly for cracking, cuts, bulges, uneven wear, and loss of pressure. Because many collector cars see limited mileage, age and storage conditions can matter as much as tread depth, especially on a vehicle that may sit for extended periods.

Good storage habits help preserve both bias-ply and radial tires. Keeping the car away from prolonged sunlight, moisture, and ozone sources, moving it periodically to avoid long-term flat spotting, and checking pressures before every drive can go a long way toward protecting tire condition between outings.