In 1957, Morris covered a wide slice of the British market, from the compact Minor to larger family saloons such as the Oxford and Isis. That breadth matters because 1957 Morris vehicles did not all use one tire size or even one wheel diameter, and several models can be found in either period-style bias-ply sizing or later radial sizing. Across four models, seven distinct sizes appear, with some overlap between the Crowley and Oxford while the Isis and Minor each carry their own size pairings. The first thing to confirm on a 1957 Morris is the exact model, then whether you want a period-correct bias-ply look or a radial alternative where one exists.
Which Tire Size Is Right for Your 1957 Morris
Seven tire sizes are used across 1957 Morris vehicles, and they vary by model rather than being shared across the full range. The real choice starts with identifying the correct model and wheel diameter, then deciding between bias-ply and radial construction where both were offered for the same model family. Understanding that distinction before choosing a product saves time and helps match the tire to the car and its intended use.
Year(s): 1957|Fit(s): Crowley, Oxford|Construction: Radial|Rim: 15 in
155R15 is a metric radial size with a 155-millimeter nominal section width and a 15-inch rim diameter, using the older Euro-metric convention that typically implies an 80-series profile. This size is specific to the Morris Crowley and Morris Oxford, and available products include Firestone and Michelin offerings in blackwall form, with tube-type and tubeless versions both present and speed ratings varying by product between T (118 mph) and H (130 mph). It suits owners who want a radial option for those models while keeping the correct 15-inch wheel diameter.
Year(s): 1957|Fit(s): Crowley, Oxford|Construction: Bias Ply|Rim: 15 in
560-15 is a numeric bias-ply size in which 5.60 represents the nominal section width and 15 is the rim diameter. This size is specific to the Morris Crowley and Morris Oxford, with Firestone and US Royal products available in narrow whitewall and wide whitewall styles, and load figures reaching 970 pounds at 32 psi. It is the natural choice for owners of those models who want a period-style bias-ply appearance and feel on a 15-inch wheel.
Year(s): 1957|Fit(s): Isis|Construction: Radial|Rim: 15-in rim
175R15 is a metric radial size with a 175-millimeter nominal section width on a 15-inch rim, following the classic Euro-metric format that typically indicates an 80-series profile. It is specific to the Morris Isis, but current product listings for this size are not present here. For an Isis owner, it represents the radial fitment path and should be confirmed against the actual wheel before choosing an equivalent product route.
Year(s): 1957|Fit(s): Isis|Construction: Bias Ply|Rim: 15 in
600-15 is a numeric bias-ply size where 6.00 indicates nominal section width and 15 identifies the rim diameter. This size is specific to the Morris Isis, with BFGoodrich products offered in both blackwall and wide whitewall styles, and listed load capacity of 1150 pounds at 32 psi. It fits the Isis owner looking for a traditional bias-ply presentation on the original 15-inch wheel diameter.
Year(s): 1957|Fit(s): Minor|Construction: Radial|Rim: 14 in
155R14 is a metric radial size with a 155-millimeter nominal section width and a 14-inch rim diameter, using the older Euro-metric convention that typically implies an 80-series profile. It is specific to the Morris Minor, and available products from Michelin and Firestone are blackwall radials, with at least one listed T speed rating carrying a 118 mph ceiling. It gives Minor owners a radial option while retaining the proper 14-inch wheel diameter.
Year(s): 1957|Fit(s): Minor|Construction: Bias Ply|Rim: 14 in
520-14 is a numeric bias-ply size in which 5.20 denotes nominal section width and 14 is the rim diameter. This size is specific to the Morris Minor, with Premium Sport products offered in narrow whitewall form and listed load figures reaching 1230 pounds at 60 psi on applicable versions. It appeals to Minor owners who want a bias-ply look on the correct 14-inch wheel, especially when whitewall styling is part of the car's presentation.
Year(s): 1957|Fit(s): Oxford|Construction: Bias Ply|Rim: 15 in
550-15 is a numeric bias-ply size where 5.50 indicates nominal section width and 15 identifies the rim diameter. It is specific to the Morris Oxford rather than universal across the 1957 Morris lineup, and the available product shown here is an Excelsior blackwall bias-ply for a 15-inch wheel. It serves Oxford owners who need that model-specific bias-ply sizing instead of the shared Crowley/Oxford radial or 5.60-15 bias option.
Four Morris models are covered for 1957, and tire size does vary by model. The Crowley and Oxford share some 15-inch fitments, while the Isis has its own 15-inch pair and the Minor uses 14-inch sizes, so identifying the exact model matters before choosing a tire. Select your model below to narrow the fitment history and product options.
1957 Morris Crowley
The 1957 Morris Crowley sits in the mid-size British saloon tradition, where practicality and everyday road manners mattered as much as styling. Its tires mount on 15-inch wheels, and the fitment path centers on either a classic numeric bias-ply size or a radial alternative in the same rim diameter.
The Isis was Morris's larger, more substantial saloon in 1957, aimed at buyers who wanted more room and a more senior feel within the lineup. Its tires fit 15-inch wheels, with one radial size path and one traditional bias-ply size associated with the model.
The Morris Minor is one of the most recognizable British small cars of the postwar era, prized for its compact proportions, simplicity, and broad enthusiast support. Its fitment is distinct from the larger Morris saloons, using 14-inch wheels rather than 15-inch wheels.
The Oxford was a core Morris family saloon in 1957 and today remains a familiar choice for British-car restorers who want a practical, usable classic. It uses 15-inch wheels and has the broadest fitment spread in the range, with one radial option and two bias-ply size paths depending on the exact setup and restoration direction.
Nineteen products are available across seven tire sizes for 1957 Morris vehicles. 155R15 includes four radial blackwall choices from Firestone and Michelin; 560-15 includes four bias-ply Firestone and US Royal options in narrow and wide whitewall; 600-15 includes two BFGoodrich bias-ply choices in blackwall and wide whitewall; 155R14 includes two radial blackwalls from Michelin and Firestone; 520-14 includes four Premium Sport bias-ply narrow whitewalls; 550-15 includes one Excelsior bias-ply blackwall. Confirm your size and construction choice first, since tube status and speed ratings can vary within some sizes.
These answers sort out which 1957 Morris models use which sizes, how the radial and bias-ply choices differ across the range, and what to check for sidewall style, tubes, rim width, and long-term collector-car care.
Size Basics & Fitment
What tire sizes fit 1957 Morris vehicles?
1957 Morris vehicles use seven sizes across four models: the Crowley uses 155R15 and 560-15, the Isis uses 175R15 and 600-15, the Minor uses 155R14 and 520-14, and the Oxford uses 155R15, 550-15, and 560-15. The Crowley, Isis, and Oxford all work with 15-inch rim diameters in their listed sizes, while the Minor uses 14-inch sizes. Where rim width guidance is listed, 155R15 fits 4.00 to 5.50-inch rims, 560-15 fits 4.5 or 4.50 to 5.50-inch rims, 600-15 fits 4.00 to 5.00-inch rims depending on product, 155R14 fits 4.00 to 5.50-inch rims, 520-14 fits 3.50 to 4.00-inch rims, and 550-15 fits 3.00 to 3.50-inch rims.
The practical takeaway is that year and make alone are not enough for a 1957 Morris. You need the exact model first, then the correct rim diameter, and then the construction type if the model can use both a radial and a bias-ply size. That is especially important with the Oxford, which appears with more than one bias-ply option in addition to a radial, and with the Minor, whose 14-inch fitment separates it from the larger Morris saloons.
What does 560-15 mean on a 1957 Morris tire?
On a 1957 Morris, 560-15 is a numeric bias-ply size. The 5.60 figure is the nominal section width and the 15 is the wheel diameter in inches. In the 1957 Morris range, 560-15 applies to the Crowley and Oxford, not to every model. Available versions come from Firestone and US Royal, with narrow whitewall and wide whitewall sidewall treatments represented.
That code matters because it points you toward a traditional postwar fitment style rather than a later radial format. If your Crowley or Oxford is being kept close to period appearance, 560-15 is the bias-ply path to investigate first. Before ordering, compare the tire you have now, the wheel diameter stamped or measured on the car, and the usable rim width, since some 560-15 products are aimed at a single 4.5-inch rim while others cover a broader width range.
What does 155R15 mean on a 1957 Morris tire?
On a 1957 Morris, 155R15 is an older Euro-metric radial size. The 155 denotes nominal section width in millimeters, the R identifies radial construction, and the 15 is the rim diameter in inches. This format was used on the Crowley and Oxford. Current offerings in that size are blackwall radials from Firestone and Michelin, and the group includes both tube-type and tubeless examples with T and H speed ratings represented.
For a Morris owner, 155R15 usually signals a radial route while keeping the same 15-inch wheel diameter used by the car. That can be attractive when the goal is to retain a classic look without using a numeric bias-ply size. The key is to read the full sidewall marking on the specific tire you are considering, because the same basic size can appear with different speed symbols and with either TT or TL construction depending on brand and series.
Buying the Right Tire
Should I choose the 155R15 or the 560-15 for my 1957 Morris?
For a 1957 Morris Crowley or 1957 Morris Oxford, the choice between 155R15 and 560-15 is mainly a construction and presentation decision, since both are 15-inch fitments for those models. The 155R15 options are radial blackwalls from Firestone and Michelin, while the 560-15 options are bias-ply tires from Firestone and US Royal with narrow and wide whitewall styles available. The radial group also shows more variation in tube type and speed symbol details across products.
If your priority is a period-style look and traditional feel, 560-15 is the more era-appropriate direction. If your priority is using a radial on the correct wheel diameter, 155R15 is the size family to compare. Neither choice should be made by year and make alone, though, because the Oxford has another bias-ply size in the mix and the exact wheel on the car still needs to be checked against the tire's listed rim-width range.
What sidewall styles are available for 1957 Morris tires?
1957 Morris tires appear in both blackwall and whitewall form, but the sidewall choices depend on size. The radial sizes with current product coverage here are blackwall only: 155R15 and 155R14. Among the bias-ply sizes, 560-15 is available in narrow whitewall and wide whitewall, 600-15 appears in blackwall and wide whitewall, 520-14 appears in narrow whitewall, and 550-15 is shown as a blackwall.
That mix gives you room to tailor the car's appearance to your restoration goals. Most British saloons of the period look naturally at home on blackwalls, while whitewalls create a more stylized presentation that may suit certain export-market looks or owner preference. If authenticity for judged events matters, check the specific expectations for your Morris club or event, since tire construction, size family, and sidewall treatment can all affect how correct the finished car appears.
What brands make tires for 1957 Morris vehicles?
Several brands cover the 1957 Morris range, with the mix changing by size. Firestone and Michelin appear in 155R15 radial fitments, Firestone and US Royal cover 560-15 bias-ply fitments, BFGoodrich covers 600-15, Michelin and Firestone cover 155R14, Premium Sport covers 520-14, and Excelsior covers 550-15. That means the Morris lineup is not served by one single brand family across every model and size.
Brand choice is easiest once you have narrowed the car to its exact size. After that, compare sidewall style, rim-width compatibility, and whether the product is tube-type or tubeless where that distinction appears. On a 1957 Morris, the smartest approach is to treat brand as the final layer of the decision rather than the first one, because the model and size determine which brands are even relevant to your car.
Fitting & Setup
What rim width do 1957 Morris tires require?
Rim width guidance for 1957 Morris tires depends on the size. The listed 155R15 radials fit 4.00 to 5.50-inch rims, 560-15 bias-ply products fit either a 4.5-inch rim or a 4.50 to 5.50-inch range depending on brand, 600-15 products span 4.00 to 4.50 inches or 4.50 to 5.00 inches depending on the version, 155R14 fits 4.00 to 5.50 inches, 520-14 fits 3.50 to 4.00 inches, and 550-15 fits 3.00 to 3.50 inches.
That spread is why the wheel itself should be measured or positively identified before selecting a tire. Even when two products share the same tire size, the accepted rim-width range can differ by brand or series. On a 1957 Morris, that matters most when comparing the Oxford's 15-inch choices or deciding between different 600-15 products for an Isis, because those are the places where the width guidance is not identical across every option.
Do 1957 Morris tires require inner tubes?
Inner-tube requirements on 1957 Morris tires depend on the exact size and product. In 155R15, tube status varies by product: Michelin XAS is marked TT, Michelin X and Michelin XAS-FF are marked TL, and some listings show no separate tube marking. The 155R14 Michelin X is marked TL, while several bias-ply products in sizes such as 560-15, 600-15, 520-14, and 550-15 do not carry an explicit TT or TL marking in the listings here.
The safest buying habit is to read the full sidewall description on the exact tire you want and match that to the wheel construction on the car. If your 1957 Morris still uses original-style wheels, tube usage may depend as much on the wheel design and condition as on the tire itself. Tube decisions should be settled before mounting so the tire, tube, valve stem, and wheel are treated as one compatible system.
Can the original 1957 Morris wheels be used with both tire sizes?
Some original 1957 Morris wheels can accept more than one listed tire size, but only within the same model and wheel diameter. The Crowley and Oxford both have 15-inch size pairings that include 155R15 and 560-15, while the Minor's two listed sizes are both 14-inch. The Isis also stays within 15 inches across its listed sizes. Rim diameter compatibility is the starting point, but rim-width requirements are not identical from one size and product to another.
That means you should not assume every original wheel works with every listed tire just because the diameter matches. Measure the actual wheel width and compare it with the size you're considering, especially on the Oxford where more than one bias-ply size is in play. Using the original wheel with a different construction type is often possible when the rim diameter is correct, but the exact product still has to be checked against its approved width range.
Maintenance, Storage & Longevity
How should I store a 1957 Morris when the tires are fitted?
A stored 1957 Morris should be kept in a cool, dry, dark space away from direct sunlight, electric motors, welders, furnaces, and other ozone-producing equipment that can age rubber prematurely. Keep the tires clean, maintain inflation, and move the car periodically if possible. Bias-ply tires used on 1957 Morris models such as 560-15, 600-15, 520-14, and 550-15 are generally more prone to temporary flat-spotting during long static storage than the radial sizes used elsewhere in the range.
If the car will sit for months, many collectors either roll it occasionally or support it in a way that reduces constant load on one patch of tread. That is particularly useful on lightly driven classics where the tire can age out before it wears out. The point is to preserve casing shape, prevent sidewall checking, and keep the car ready for gentle recommissioning rather than trying to undo storage-related damage later.
How long do tires on a 1957 Morris typically last?
Tires on a 1957 Morris should be judged more by age and condition than by mileage. Collector-car tires are often inspected closely once they reach five to seven years of service, and many owners begin serious replacement consideration around the ten-year mark regardless of remaining tread. The DOT-style date code on the tire sidewall is the starting point for age, but cracking, hardening, vibration, and chronic air loss can justify replacement sooner.
That age-first approach fits the way most Morris saloons and Minors are used today: short drives, seasonal use, and long stretches of storage. A tire that looks acceptable from a distance may still be past its ideal service window. If you have just acquired a 1957 Morris and do not know the tire age, checking the date code and overall condition is one of the smartest first steps before putting regular road miles on the car.
How often should tires on a 1957 Morris be inspected?
Tires on a 1957 Morris should be inspected before every drive and again before any longer outing. Look for sidewall cracking, cuts, bulges, irregular tread wear, embedded debris, and signs that the tire is losing pressure. Where tube-type products are used, the valve stem and any signs of tube-related leakage deserve the same attention as the casing itself. Spare-tire condition matters too, especially on a car that may be driven far from modern service support.
Regular inspections are especially important on low-use classics because age damage can develop while the tread still looks fresh. A short walk-around before leaving the garage is often enough to catch the obvious problems. On a 1957 Morris that still sees touring use, adding a hand-pressure or gauge check to that routine helps you spot slow leaks early and keeps the car driving more consistently from one outing to the next.
Restoration & Authenticity
What tires were originally fitted to the 1957 Morris Minor?
A 1957 Morris Minor would originally have been associated with bias-ply construction, and in this range the period-style size is 520-14. The model also has a 155R14 radial size path, but radial fitments represent a later construction approach rather than the default mid-1950s norm. Current 520-14 products appear as narrow whitewall bias-ply tires, while current 155R14 products are blackwall radials from Michelin and Firestone.
For a restoration, that means the first question is whether you want to reflect period construction or update to a radial while staying with the correct 14-inch wheel diameter. If show authenticity is important, confirm market-specific expectations with a Morris club or marque specialist, since regional delivery differences and judging standards can matter. Construction type, sidewall appearance, and the overall stance of the car all play into how convincingly original the finished Minor looks.
Does correct tire fitment matter for showing a 1957 Morris?
Correct tire fitment matters on a shown 1957 Morris because judges and knowledgeable enthusiasts often notice construction type, size family, and sidewall treatment quickly. A Morris presented as an authentic mid-1950s car generally looks more period-correct on a proper bias-ply size than on a modern radial, and a sidewall style that clashes with the car's market or restoration theme can stand out just as much as an incorrect wheel finish.
That does not mean every event applies the same standard. Some local shows reward overall presentation, while concours-style judging can be far stricter about whether a Minor, Oxford, Crowley, or Isis wears the right construction and visual treatment. If your goal is competitive authenticity, use the listed size family as a guide and then check event rules or Morris marque resources to refine the final choice before the car is judged.
What is the difference between Firestone and US Royal 560-15 tires for the 1957 Morris?
For a 1957 Morris Crowley or 1957 Morris Oxford using 560-15, both Firestone and US Royal offer bias-ply tires in narrow and wide whitewall styles. The listed Firestone versions show a 4.5-inch rim fitment and 970 pounds at 32 psi, while the listed US Royal versions cover a wider 4.50 to 5.50-inch rim range and also carry 970 pounds at 32 psi. The Firestone versions are listed at 18 pounds, and the US Royal versions at 17 pounds.
Those differences matter most when you are fine-tuning a restoration around wheel width and visual preference rather than simply picking any 560-15 tire. If your wheel is on the wider end of the acceptable range, the US Royal fitment window may be useful. If your priority is matching a preferred brand heritage or whitewall proportion within a classic bias-ply presentation, comparing the exact sidewall style and wheel width on the car will narrow the decision effectively.
Safety & Road Use
Are 1957 Morris tires safe for highway driving?
1957 Morris tires can be suitable for highway use when the size, condition, inflation, and construction match the car and the way it is driven. Among the listed radial products, 155R15 includes T-rated options to 118 mph and H-rated options to 130 mph, while 155R14 includes at least one T-rated option to 118 mph. The bias-ply sizes shown here do not carry separate speed symbols in the listed markings. On a 1950s Morris, the car's own braking, suspension, steering, and general mechanical condition are usually more limiting than the tire's speed capability at normal road speeds.
Safe highway use depends less on chasing the highest speed symbol and more on using fresh, properly fitted tires on a sound car. A well-sorted Minor or Oxford on the correct-size tires can be enjoyable on modern roads, but it still needs to be driven with the manners appropriate to a 1950s design. If the car has sat for long periods, inspect the tires carefully and make the first longer trip a recommissioning exercise rather than an endurance test.
What inflation pressure should I use for 1957 Morris tires?
Inflation pressure for a 1957 Morris should be set by the vehicle's factory recommendation for the model and by the specific tire's rated limits, not by copying a pressure from a different size. The listed maximum load-and-pressure figures include 155R15 at 1045 pounds at 44 psi, 560-15 at 970 pounds at 32 psi, 600-15 at 1150 pounds at 32 psi, 155R14 at 990 pounds at 44 psi, and 520-14 at 1230 pounds at 60 psi on applicable versions. Those figures describe the tire's rating point, not necessarily the day-to-day running pressure for your car.
The best practice is to start with the Morris factory recommendation for your exact model if you have it, then make sure the selected tire is appropriate for that use. Because the 1957 Morris lineup spans different models, wheel diameters, and constructions, there is no single universal pressure number that should be applied across the range. Keeping left and right pressures even on each axle also matters for predictable tracking and tire wear on older suspension designs.
What should I check before taking a 1957 Morris on a longer drive?
Before a longer drive in a 1957 Morris, inspect each tire for cracking, cuts, bulges, exposed cords, uneven wear, and proper inflation. Check the valve stems, and if your setup uses tube-type products, pay close attention to any slow leaks or stem damage that could point to a tube issue. Make sure the spare is usable and correctly inflated as well. Tire condition should be part of a broader pre-drive check that also includes brakes, fluid levels, wheel bearings, steering play, and lighting.
That routine matters because a Morris that handles fine on a short local run can still reveal weak points during a sustained outing. Tires are one of the easiest areas to inspect in advance, and they can prevent a roadside interruption if caught early. For a car that has been in storage, a short shakedown close to home after the inspection is a smart step before committing the 1957 Morris to a club tour or highway trip.
