In 1958, Morris offered practical British motoring in several distinct forms, from the compact Minor to larger family saloons such as the Oxford and Crowley. That breadth matters when choosing tires, because 1958 Morris models do not all share one universal size or one universal wheel diameter. Across the three models, five sizes appear, with some 15-inch fitments shared by the Crowley and Oxford and separate 14-inch options reserved for the Minor. The real starting point is to identify your exact model first, then decide whether you want a period-correct bias-ply look or a radial tire that better suits regular road use on the sizes available for your car.
Which Tire Size Is Right for Your 1958 Morris
Five tire sizes are available for 1958 Morris vehicles, and they vary by model rather than fitting the entire Morris range for the year. The main decision is first confirming whether your car uses a 14-inch or 15-inch wheel, then choosing between bias-ply and radial construction where both were offered for that model. Understanding that distinction before choosing a product saves time and helps you narrow in on the right match.
Year(s): 1958|Fit(s): Crowley, Oxford|Construction: Radial|Rim: 15 in
155R15 is a metric radial size with a 155-millimeter section width, radial construction, and a 15-inch rim diameter; in this format, the absent aspect ratio is conventionally treated as an 80-series profile. Firestone and Michelin offer it in blackwall form, and tube status and speed rating vary by product, including T-rated options to 118 mph and H-rated options to 130 mph. On a 1958 Morris, this is a 15-inch fitment specific to the Crowley and Oxford rather than the full model range. It suits owners who want a radial in the correct overall family of size for more settled road manners than a bias-ply alternative.
Year(s): 1958|Fit(s): Crowley, Oxford|Construction: Bias Ply|Rim: 15 in
560-15 is a numeric bias-ply size in which the first number is the nominal section width and the final number is the 15-inch rim diameter. Firestone and US Royal offer this size with narrow whitewall and wide whitewall sidewall styles, and the listed products carry load ratings up to 970 pounds at 32 psi. On a 1958 Morris, this size is specific to the Crowley and Oxford rather than universal across every model. It is the natural choice for an owner pursuing period presentation and the steering feel associated with a traditional bias-ply tire.
Year(s): 1958|Fit(s): Minor|Construction: Radial|Rim: 14 in
155R14 is a metric radial size with a 155-millimeter section width and a 14-inch rim diameter, with the unstated profile conventionally treated as an 80-series radial. Michelin and Firestone offer it in blackwall form, and the available products include a T-rated option to 118 mph. This is a Minor-only size within the 1958 Morris range, so it does not interchange with the 15-inch Crowley and Oxford fitments. It is the straightforward pick for a driver who wants radial construction on a Minor while staying with the correct 14-inch wheel diameter.
Year(s): 1958|Fit(s): Minor|Construction: Bias Ply|Rim: 14 in
520-14 is a numeric bias-ply size that uses the older width-and-rim code, with a nominal 5.20-inch section width on a 14-inch wheel. Premium Sport offers it in narrow whitewall form, and the listed products include versions rated up to 1230 pounds at 60 psi. This size is specific to the 1958 Morris Minor and is not shared with the larger 15-inch Morris models. It best fits a restoration-minded Minor owner who wants an era-appropriate bias-ply appearance rather than a radial conversion within the same model family.
Year(s): 1958|Fit(s): Oxford|Construction: Bias Ply|Rim: 15 in
550-15 is a numeric bias-ply size, with the first number indicating nominal section width and the last number showing a 15-inch rim diameter. Excelsior offers this size in blackwall form on a 15-inch application. Within the 1958 Morris range, it is an Oxford-specific fitment rather than one shared across all models. It is most appropriate for an Oxford owner who needs the narrower 15-inch bias-ply option tied to that model's fitment range.
Three Morris models are covered for 1958, and tire size does vary by model. The Minor uses 14-inch fitments, while the Crowley and Oxford use 15-inch fitments, with the Oxford carrying the widest spread of size options. Select a model below for model-specific fitment history and products.
1958 Morris Crowley
The 1958 Morris Crowley sits in the middle of the range as a traditional British saloon with roomier proportions than the smallest Morris offerings. Its tires mount on 15-inch wheels, and the choice here centers on a shared radial or bias-ply fitment also used on the Oxford rather than on a unique wheel diameter.
The Morris Minor was one of Britain's most recognizable postwar small cars, valued for its compact size, simple engineering, and broad enthusiast following. For 1958, its tires mount on 14-inch wheels, and its fitments are distinct from the larger Morris models in both rim diameter and size family.
The 1958 Morris Oxford represents the larger family-saloon side of the Morris lineup, with a more substantial footprint than the Minor and a different fitment story to match. Its tires mount on 15-inch wheels, and it carries the broadest choice of the three models, including both shared Crowley sizes and one Oxford-specific bias-ply option.
Eighteen products are available across five tire sizes for 1958 Morris vehicles. 155R15 includes 4 radial blackwall choices from Firestone and Michelin; 560-15 has 4 bias-ply options from Firestone and US Royal in narrow and wide whitewall styles; 155R14 has 2 radial blackwalls from Michelin and Firestone; 520-14 includes 4 bias-ply narrow whitewalls from Premium Sport; 550-15 offers 1 bias-ply blackwall from Excelsior. Confirm your model, size, and construction preference first, since tube status and speed ratings can vary within a size.
These FAQs sort out the 14-inch and 15-inch fitments used across 1958 Morris models, the bias-ply versus radial decision where both exist, and the practical details that matter for collector cars driven occasionally or restored for period appearance.
Size Basics & Fitment
What tire sizes fit 1958 Morris vehicles?
1958 Morris vehicles use five sizes across three models. The Crowley uses 155R15 and 560-15, the Minor uses 155R14 and 520-14, and the Oxford uses 155R15, 550-15, and 560-15. The Minor is the only 14-inch application in the range, while the Crowley and Oxford are 15-inch cars. Where rim-width guidance is listed, 155R15 fits 4.00 to 5.50 inches, 560-15 fits 4.5 to 5.50 inches depending on product, 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 means year and make alone are not enough for a confident tire choice on a 1958 Morris. Start by identifying whether you have a Minor, Crowley, or Oxford, then confirm whether your wheel is 14 or 15 inches before narrowing the choice to bias-ply or radial. Owners of Crowley and Oxford models have some overlap in 15-inch sizing, but the Minor is its own fitment family. Matching the tire to the actual wheel on the car is especially important on older British vehicles that may have seen wheel swaps during decades of ownership.
What does 560-15 mean on a 1958 Morris tire?
On a 1958 Morris, 560-15 is a traditional numeric bias-ply size. The 5.60 figure is the nominal section width in inches, and the 15 is the wheel diameter in inches. It is not a modern metric radial code, and it does not describe the tire the same way a 155R15 does. Within the 1958 Morris range, 560-15 is used on the Crowley and Oxford, both of which are 15-inch applications.
That older code matters because it points you toward a period-style bias-ply tire rather than a later radial format. If you are restoring a Crowley or Oxford and want the visual character of a late-1950s tire, 560-15 is the format that aligns with that goal. If your priority is road behavior closer to a modern driving experience, compare it with the 155R15 radial used on the same two models. The choice is less about wheel diameter than about construction and the kind of driving or presentation you want from the car.
What does 155R15 mean on a 1958 Morris tire?
On a 1958 Morris, 155R15 is a metric radial size. The 155 is the section width in millimeters, the R identifies radial construction, and the 15 is the wheel diameter in inches. In this older metric style, the aspect ratio is not written in the code and is conventionally treated as an 80-series profile. That size appears on 1958 Morris Crowley and Oxford models rather than across the entire Morris lineup.
Recognizing that code helps you separate a later-style radial fitment from the numeric bias-ply sizes used on the same wheel diameter. A Crowley or Oxford owner choosing 155R15 is generally choosing a radial construction on a 15-inch wheel, not simply a different spelling of the same tire. The distinction affects sidewall behavior, ride feel, and restoration character. It is also worth checking the exact sidewall marking on the product you select, because tube type and speed rating can differ within the 155R15 family.
Buying the Right Tire
Should I choose the 155R15 or the 560-15 for my 1958 Morris?
For a 1958 Morris Crowley or Oxford, the choice between 155R15 and 560-15 is mainly a choice between radial and bias-ply construction on a 15-inch wheel. The 155R15 is a metric radial offered in blackwall form by Firestone and Michelin, while the 560-15 is a numeric bias-ply available from Firestone and US Royal with narrow or wide whitewall styling. Both sizes belong to the same model group, but they serve different restoration and driving priorities.
Owners focused on period appearance usually gravitate toward the 560-15 because it preserves the look and construction style expected on a late-1950s British saloon. Owners who drive their Morris more regularly often prefer the 155R15 because it keeps the car in a radial format while staying in the correct 15-inch wheel family. Neither decision should be made by year alone, since the Minor does not use either of these 15-inch sizes. Confirm the exact model and wheel before you commit to one path or the other.
What sidewall styles are available for 1958 Morris tires?
1958 Morris tire choices include both blackwall and whitewall sidewall styles, but the available look depends on the size. The radial sizes 155R15 and 155R14 are offered in blackwall form. The 560-15 bias-ply is available in both narrow whitewall and wide whitewall versions, the 520-14 bias-ply is offered in narrow whitewall form, and the Oxford-specific 550-15 is available as a blackwall. That gives the year-make range a wider visual spread than many single-model fitment pages.
For a factory-minded British restoration, blackwall or a restrained whitewall is usually the safer visual direction than an oversized whitewall treatment. Wide whitewalls can create a more stylized look, but they may shift the car away from a strictly authentic late-1950s Morris presentation depending on the market and show standard. If your goal is judged originality, verify the expected sidewall style for your exact model and destination market with a Morris club or marque specialist. If your goal is simply period flavor, the available whitewall options offer room to tailor the car's appearance.
What brands make tires for 1958 Morris vehicles?
Several brands cover the 1958 Morris range, and they divide by size. Firestone and Michelin serve the radial sizes, with both appearing in 155R15 and 155R14. Firestone and US Royal cover the 560-15 bias-ply size, Premium Sport covers the 520-14 bias-ply for the Minor, and Excelsior covers the 550-15 bias-ply for the Oxford. That spread gives Morris owners options across both radial and traditional bias-ply construction.
Brand choice on a 1958 Morris is usually tied first to size and construction, then to the sidewall look you want. A Minor owner looking for a 14-inch radial is choosing between Michelin and Firestone, while a Minor owner staying with 520-14 bias-ply is in a different brand family entirely. Crowley and Oxford owners have the broadest overlap because they can compare radial brands in 155R15 and bias-ply brands in 560-15. Once you know your exact size, the meaningful comparison becomes construction style, sidewall appearance, and any product-specific details such as tube markings or speed rating.
Fitting & Setup
What rim width do 1958 Morris tires require?
Rim-width guidance varies by size on 1958 Morris applications. The 155R15 radial fits 4.00 to 5.50-inch rims where listed, the 560-15 bias-ply ranges from 4.5 inches up to 4.50 to 5.50 inches depending on product, the 155R14 radial fits 4.00 to 5.50-inch rims, the 520-14 bias-ply fits 3.50 to 4.00-inch rims, and the 550-15 bias-ply fits 3.00 to 3.50-inch rims. Those ranges are one of the clearest practical differences between the 14-inch and 15-inch Morris fitments.
Before selecting a tire, measure or verify the actual wheel on the car rather than assuming all original-looking Morris wheels are the same width. That matters especially on cars that have passed through several owners or had wheels exchanged between models over the years. A Crowley or Oxford owner comparing 155R15 and 560-15 should confirm the existing 15-inch rim falls within the acceptable width for the chosen product. A Minor owner should be especially attentive, because the 520-14 and 155R14 families are aimed at different width ranges despite sharing the same wheel diameter.
Do 1958 Morris tires require inner tubes?
Tube requirements vary by size and sometimes by product within the same size on a 1958 Morris. The 155R14 radial includes a tubeless product, while the 155R15 radial family includes both tubeless and tube-type examples. The bias-ply sizes listed here do not consistently carry tube markings in every product entry, so the safest reading is to confirm the exact sidewall marking of the tire you choose rather than treating the whole size as one universal tube status.
That matters because wheel design and tire marking need to agree before installation on an older car. If your selected tire is marked TT, plan on an appropriate tube and flap arrangement where required. If it is marked TL, confirm the wheel itself is suitable for tubeless use and in sound condition. On vintage British steel wheels, condition at the bead seat and valve hole is just as important as the tire specification. One 155R15 product should not be assumed to set the rule for every other 155R15 offering.
Can the original 1958 Morris wheels be used with both tire sizes offered for each model?
Sometimes, but only within the same model's wheel diameter and only after checking rim width carefully. The Crowley and Oxford each use 15-inch fitments, so their radial and bias-ply alternatives stay within a common 15-inch diameter family. The Minor's two choices are both 14-inch sizes, so they remain within that model's original wheel diameter. The year-make range does not support mixing the Minor's 14-inch sizes with the Crowley and Oxford's 15-inch sizes.
Diameter compatibility is only the first step on a 1958 Morris. The more important question is whether the wheel width matches the product you intend to use, since the listed width ranges are not identical from one size to another. That is especially relevant when moving between a numeric bias-ply and a metric radial on the same nominal wheel diameter. Original wheels can often remain in service, but they should be measured, inspected for damage or corrosion, and matched to the chosen tire's approved rim-width range before final installation.
Maintenance, Storage & Longevity
How should I store a 1958 Morris when the tires are fitted?
A 1958 Morris should be stored in a cool, dry, dark place away from direct sunlight, electric motors, welders, battery chargers, and other ozone-producing equipment. Keep the tires clean and properly inflated, and avoid letting the car sit for long periods on a damp floor. Bias-ply tires tend to flat-spot more readily during static storage than radials, so Crowley, Oxford, or Minor owners running numeric bias-ply sizes should be especially mindful of long-term parking habits.
Moving the car periodically helps distribute the load across a different part of the tread, and long-term storage stands can reduce stress if the car will be parked for months. If you do use stands, support the car correctly and avoid leaving suspension components in an unnatural position without planning for it. A breathable cover and a clean storage environment matter just as much as tire pressure. Good storage habits are especially valuable on low-mileage collector cars, where age often becomes a larger factor than tread wear.
How long do tires on a 1958 Morris typically last?
On a 1958 Morris, tire life is usually judged more by age than by mileage. Collector vehicles often accumulate miles slowly, so a tire can look usable while still reaching an age where closer evaluation is needed. A sensible rule is to inspect more critically once a tire reaches five to seven years of age and to treat around ten years as a point where replacement deserves serious consideration, regardless of tread depth. The DOT date code on the sidewall is the starting point for that conversation.
That guideline applies whether your Morris runs a radial like 155R15 or 155R14 or a bias-ply size such as 560-15, 520-14, or 550-15. Visible cracking, hardening, repeated air loss, vibration, or signs of separation can move replacement higher on the priority list even sooner. Because older cars are often driven only occasionally, owners sometimes underestimate tire age until a long tour is planned. Building tire age into your maintenance calendar is one of the simplest ways to keep a collector Morris trustworthy on the road.
How often should tires on a 1958 Morris be inspected?
Tires on a 1958 Morris should be checked before every drive, with a more careful inspection before any longer outing. Look for sidewall cracking, cuts, bulges, uneven tread wear, and changes in air retention. If your chosen product uses an inner tube, pay close attention to valve-stem condition and any signs that the tube may be pinched or losing pressure slowly. A quick visual check is good, but an occasional hands-on inspection is better.
This routine matters because a collector car can sit quietly for weeks and then be expected to run at road speed with little warning. Storage conditions, age, and infrequent use can affect an older tire even when tread wear is minimal. On a Morris, steering feel is often light enough that you may notice a pressure issue early, but do not rely on feel alone. Checking pressure, sidewalls, and the spare at regular intervals turns a simple maintenance habit into a meaningful safeguard before local drives or club tours.
Restoration & Authenticity
What tires were originally fitted to the 1958 Morris Minor?
A 1958 Morris Minor would originally have been associated with bias-ply tire practice for its era, and within the available fitments here the period-style size is 520-14. The alternate 155R14 size is a radial fitment offered for the same model, but radial construction represents a later-style driving choice rather than the most historically typical late-1950s starting point. Original-equipment branding can vary by market and should not be assumed from current replacement offerings alone.
For a Minor restored to period standards, the most important authenticity markers are the correct 14-inch size family, bias-ply construction if originality is the goal, and a sidewall style that suits the market where the car was sold. If your car has a complicated history or came from another country, confirm the expected specification with a Morris club, period sales literature, or a marque specialist. That extra step is worthwhile because export-market and trim-level details can affect what judges or historians expect to see.
Does correct tire fitment matter for showing a 1958 Morris?
Correct tire fitment matters on a 1958 Morris because judges and knowledgeable enthusiasts often notice size family, construction type, and sidewall presentation immediately. A radial substituted where a bias-ply would have been typical, or a sidewall style that looks out of place for the car's market and era, can change the overall impression of authenticity. The effect may be modest at informal events and more significant in concours-style judging where details carry weight.
For a show-focused Morris, think about tire choice as part of the car's visual language rather than as an isolated maintenance item. A Minor on 520-14 bias-ply with an era-appropriate sidewall will present differently from the same car on 155R14 blackwall radials, even if both are usable on the road. Crowley and Oxford owners face the same decision on their 15-inch options. Event standards differ, so it is wise to review the rulebook or consult a Morris club before finalizing a set intended for judged presentation.
What is the difference between Michelin X and Michelin XAS for the 1958 Morris?
For the 1958 Morris 155R15 fitment, Michelin X and Michelin XAS are both radial blackwall options, but they are not marked exactly the same. The Michelin X appears as 155R15 82T TL, which identifies a tubeless T-rated version with a 118 mph speed ceiling. The Michelin XAS appears as 155HR15 82H TT, which is a tube-type H-rated version with a 130 mph ceiling. Both are intended for the same 15-inch size family used by the Crowley and Oxford.
That distinction gives you two meaningful selection points beyond brand loyalty alone. One is tube status, because a TT tire leads you toward a tube-compatible setup while a TL tire requires a wheel suitable for tubeless use. The other is sidewall marking and speed rating, which may matter to owners who want a specific period flavor or a particular product character within the radial category. Since both fit the same size family, the smarter comparison is not which is universally better, but which one aligns with your wheel setup and your intended use of the car.
Safety & Road Use
Are 1958 Morris tires safe for highway driving?
1958 Morris tires can be suitable for highway use when the size, construction, age, condition, and inflation are all appropriate to the car. Among the listed radials, T-rated products carry a 118 mph ceiling and H-rated products carry a 130 mph ceiling. Those ratings are well above normal highway speeds, but they do not override the realities of a late-1950s car's brakes, steering, suspension, and general mechanical condition. Bias-ply options can also be roadworthy, though they bring a different feel than radials.
The practical question is less whether the tire can exceed highway speed and more whether the whole Morris is prepared for sustained road use. An older car on fresh, properly matched tires can still be limited by alignment, brake fade, worn bushings, or a marginal cooling system on a long run. If your car sees mostly local use, a bias-ply may be entirely appropriate. If you plan more frequent road mileage, many owners prefer a radial where available, while still respecting the car's age and original design limits.
What inflation pressure should I use for 1958 Morris tires?
Inflation pressure on a 1958 Morris should follow the vehicle manufacturer's recommendation for the car and the tire maker's load-and-pressure limits for the exact product. The available tires here show different maximum figures by size: 155R15 includes 1045 pounds at 44 psi, 560-15 includes 970 pounds at 32 psi, 155R14 includes 990 pounds at 44 psi, and 520-14 includes 1230 pounds at 60 psi. Those are maximum load-and-pressure pairings, not a universal running pressure for every Morris model or every tire.
Use those figures as the tire's capability reference, then compare them with the owner's manual or trusted marque guidance for the actual vehicle. A Minor on 520-14 should not simply be inflated to the same pressure as a Crowley or Oxford on 560-15, and a radial should not automatically be treated like a bias-ply. Pressure tuning also depends on vehicle loading and wheel condition. If your car has been modified or fitted with non-original wheels, treat the manual as the starting point and confirm the final setup with the tire manufacturer's recommendations.
What should I check before taking a 1958 Morris on a longer drive?
Before a longer drive in a 1958 Morris, inspect every tire for cracks, cuts, bulges, embedded debris, uneven wear, and proper inflation. Check that the valve stems are sound, and if your chosen setup uses tube-type tires, pay special attention to slow leaks or signs of stem movement. Do not forget the spare, because a road-ready main set loses value quickly if the spare is aged out or flat. Tire condition should be part of a larger pre-drive inspection, not the whole checklist.
A sensible touring check on a late-1950s Morris also includes brakes, fluid levels, cooling system health, steering play, lighting, and wheel fastener security. Cars of this age can cruise reliably when prepared, but they reward prevention more than improvisation. On the tire side, matching all four corners in size and construction is ideal unless a temporary spare strategy is in play. If anything about the sidewalls, pressures, or road feel seems questionable during a short shakedown run, sort that out before committing the car to a longer journey.
