1958 Morgan Tire Fitment Guide

1958 Morgan vehicles use three tire sizes across the model range: 155R15, 560-15, and 500-16. The 155R15 radial and 560-15 bias-ply fit the 1958 Morgan 4-4 Series & Plus 4 on 15-inch rims, while 500-16 fits 1958 Morgan Plus 4 and 1958 Morgan Series applications that use 16-inch rims. Rim width guidance is available by size, with 155R15 commonly listed for 4.00 to 5.50-inch rims, 560-15 for 4.5-inch or 4.50 to 5.50-inch rims depending on product, and 500-16 for 4.00 to 5.00-inch rims.

The practical takeaway is that 1958 Morgan tire selection starts with wheel diameter, not just year and make. Once you know whether your car is on a 15-inch or 16-inch wheel, the remaining choice becomes much easier, especially on the 15-inch cars where both radial and bias-ply constructions are available.

On a 1958 Morgan, 560-15 is a traditional numeric bias-ply size. The 560 number identifies the tire's nominal section-width class in period sizing practice, and the 15 means it mounts on a 15-inch wheel. It is not a modern metric size, and it does not read the same way as a later radial size such as 155R15.

That matters because a 560-15 is aimed at owners who want a more traditional construction and appearance on the correct 15-inch Morgan fitment. If your 1958 Morgan is a 4-4 Series & Plus 4 application, this size keeps you in a classic bias-ply format, while a 16-inch Morgan application would need a completely different size family.

No, 1958 Morgan models do not all use the same tire size. The 4-4 Series & Plus 4 use 15-inch fitments and can take either 155R15 radial or 560-15 bias-ply tires, while the Morgan Plus 4 and Morgan Series listings also include a separate 500-16 bias-ply fitment on 16-inch wheels. That split means the model name and wheel diameter both affect tire selection.

A buyer who only knows "1958 Morgan" can easily end up comparing tires that mount on different wheels. Confirm the exact model and inspect the actual wheel diameter before narrowing your choices, especially with Plus 4 applications that appear in more than one fitment grouping for this model year.

For a 1958 Morgan 4-4 Series & Plus 4 on 15-inch wheels, the choice between 155R15 and 560-15 is mainly a construction decision. The 155R15 is a radial size offered in blackwall form by Firestone and Michelin, while the 560-15 is a bias-ply size offered by Firestone and US Royal in narrow and wide whitewall versions. Both fit the same wheel diameter, but they represent different periods and driving character.

Owners focused on an era-correct presentation usually gravitate toward the bias-ply option, especially when sidewall styling is part of the restoration goal. Owners who plan to drive their 1958 Morgan more regularly often prefer the radial format, provided they confirm rim width, tube status, and the specific product's speed marking before making the final choice.

Sidewall style varies by size on 1958 Morgan tires. The 155R15 radial choices are blackwall tires, the 560-15 bias-ply choices are available as narrow whitewall and wide whitewall versions, and the 500-16 bias-ply option is a blackwall. That gives the 15-inch fitments the widest visual range, especially for owners comparing period presentation against a more understated sporting look.

For a late-1950s British sports car such as a Morgan, blackwall tires generally align with the clean, functional look most enthusiasts expect, while whitewall bias-ply tires create a distinctly different appearance. If show presentation matters, check the standards of your club or event before choosing a whitewall width simply because it fits the size.

Three brands appear in 1958 Morgan fitments: Firestone, Michelin, and US Royal. Firestone and Michelin cover the 155R15 radial size, Firestone and US Royal cover the 560-15 bias-ply size, and Firestone appears in the 500-16 bias-ply offering. Brand availability therefore changes with size rather than applying uniformly across the full 1958 Morgan range.

That brand split is useful when you are narrowing your search by both model and construction. A 15-inch Morgan owner has the broadest cross-section of brand and style choices, while a 16-inch Morgan owner needs to focus first on the correct fitment and then compare the specific characteristics of the available product in that size.

Rim width requirements for 1958 Morgan tires depend on the size you choose. The 155R15 radial size is listed for 4.00 to 5.50-inch rims, 560-15 bias-ply products are listed either for a 4.5-inch rim or for a 4.50 to 5.50-inch rim range depending on brand, and 500-16 is listed for 4.00 to 5.00-inch rims. The wheel diameter still has to match the tire's stated 15-inch or 16-inch fitment.

That means two tires with the same wheel diameter are not automatically interchangeable across every wheel width. Before mounting a tire on a 1958 Morgan, compare the actual wheel against the specific tire's listed rim-width requirement rather than assuming all period wheels were built to one standard.

Inner-tube requirements on 1958 Morgan tires vary by size and by product. Within 155R15, some products are marked TL for tubeless and others are marked TT for tube-type, so that size varies by product rather than following one rule across the board. The 560-15 and 500-16 products shown here are not marked with mixed tube designations, so the main fitment caution falls on the 155R15 radial options.

The safest approach is to match your tube decision to the exact tire and the wheel you plan to use, rather than relying on size alone. If your 1958 Morgan is being restored with original-style wheels, confirm the wheel condition and consult the tire manufacturer's sidewall marking before deciding whether a tube is appropriate.

On 15-inch 1958 Morgan applications, both 155R15 and 560-15 mount on the same nominal wheel diameter. The 155R15 radial is listed for 4.00 to 5.50-inch rims, while 560-15 bias-ply products are listed for either 4.5-inch rims or a 4.50 to 5.50-inch range depending on the tire. That means the wheel diameter is compatible across both sizes, but the actual rim width still needs to be checked.

This is helpful for owners deciding between a traditional bias-ply look and a radial alternative without changing wheel diameter. Measure the wheel and compare it to the exact tire's approved rim-width range before mounting, especially on older wheels that may have been changed, repaired, or swapped during the car's lifetime.

A stored 1958 Morgan should be kept away from direct sunlight, electric motors, battery chargers, welders, and other ozone sources that accelerate rubber aging. Keep the car in a cool, dry space, maintain inflation, and move it periodically so one section of the tire is not carrying the load for months at a time. Bias-ply tires are especially prone to flat-spotting during long static storage, while any older collector tire can suffer cosmetic cracking if stored poorly.

If the car will sit for an extended season, many owners use tire cradles or support the vehicle in a way that reduces prolonged loading, while still following safe storage practices. A little preparation goes a long way with a low-mileage 1958 Morgan, because age and environment usually affect collector tires more than tread wear.

Tires on a 1958 Morgan should be judged more by age and condition than by miles driven. Collector-car tires are commonly evaluated closely once they reach the five-to-seven-year range, and many owners treat around ten years from the date code as the point where replacement deserves serious consideration even if tread remains. That applies whether the tire is a bias-ply 560-15 or 500-16, or a radial 155R15.

A 1958 Morgan that sees only occasional use can still age its tires out long before it wears them out. Check the DOT or manufacturer date coding where present, inspect the sidewalls and tread regularly, and replace on condition and age rather than waiting for obvious baldness or a roadside failure.

Tires on a 1958 Morgan should be inspected before every drive and again before any longer outing. Look for sidewall cracking, cuts, bulges, irregular tread wear, and signs that the tire is losing pressure between drives. If your chosen tire is tube-type, the valve stem and tube-related sealing condition deserve the same attention as the casing itself.

Regular inspection is especially important on a light, older sports car because problems can show up long before the car accumulates significant mileage. A quick check before driving gives you time to catch aging rubber, pressure loss, or a deteriorating spare before it turns a pleasant Morgan outing into a preventable roadside issue.

For a 1958 Morgan 4-4 Series & Plus 4, bias-ply construction is the period-correct starting point for originality, and 560-15 fits that expectation within the available size range. Radial options such as 155R15 are also available today, but they reflect a later construction style even when they fit the same 15-inch wheel diameter. Original equipment branding can vary by market and period supply, so size and construction are usually the first authenticity markers to confirm.

If your goal is concours accuracy, start with the correct model, wheel diameter, and construction type before worrying about fine details. Marque clubs and long-time Morgan specialists are the best source for event-specific guidance on whether your car should wear blackwall or a particular sidewall style for the way it will be judged.

Correct tire fitment absolutely matters when showing a 1958 Morgan, especially in restoration or preservation classes. Judges and knowledgeable enthusiasts notice the overall visual correctness of the tire, including whether the size belongs to the model, whether the construction looks period-appropriate, and whether the sidewall style suits the era and presentation of the car. A radial on a car judged for strict originality can draw the same kind of attention as an obviously modern sidewall treatment.

For a judged 1958 Morgan, choose the tire the same way you would choose paint details or trim hardware: according to the standard your event actually uses. Club guidance is especially useful here because some shows reward authenticity very strictly, while others are more tolerant of sympathetic upgrades that preserve the car's vintage character.

On a 1958 Morgan using 155R15, the Michelin X and Michelin XAS are both radial blackwall options, but they differ in their sidewall markings and service details. The Michelin X is marked 155R15 82T TL, which means a T speed rating up to 112 mph and tubeless construction, while the Michelin XAS is marked 155HR15 82H TT, which means an H speed rating up to 130 mph and tube-type construction. The XAS-FF in the same family is also H-rated but marked TL.

Those distinctions matter when you are balancing originality, wheel setup, and driving style on a 1958 Morgan. A buyer comparing these Michelin options should look beyond the shared size and consider the speed symbol, the tube or tubeless marking, and the intended wheel setup before deciding which radial best suits the car.

1958 Morgan tires can be suitable for highway driving when they are in good condition, correctly fitted, and used within their construction and speed limits. The 155R15 radial options shown here include T-rated products to 112 mph and H-rated products to 130 mph, while the 560-15 and 500-16 bias-ply listings do not show separate speed symbols in the same way. On a 1950s Morgan, the car's suspension, braking, steering, and overall mechanical state are often at least as important as the tire's rated ceiling.

For real-world use, the key is matching your expectations to the tire type and the car itself. A properly sorted 1958 Morgan on fresh tires can be enjoyable on modern roads, but long high-speed driving should always be approached with respect for both the tire's marking and the limitations of a lightweight vintage sports car.

Inflation pressure for 1958 Morgan tires should follow the vehicle recommendation first and the tire's own rating second. The available products here show maximum load and pressure figures of 1045 pounds at 44 psi for one 155R15 radial, 970 pounds at 32 psi for 560-15 bias-ply products, and 760 pounds at 32 psi for the 500-16 bias-ply product. Those figures describe the tire's rated capacity point, not necessarily the pressure your Morgan should run in service.

Use the factory handbook or a trusted Morgan specialist to establish the operating pressure for your exact car, then confirm that the chosen tire is being used within its rated limits. Avoid transferring a pressure from one size to another just because the tires look similar, since the load and construction differences are real.

Before a longer drive in a 1958 Morgan, inspect every tire for cracks, cuts, bulges, uneven wear, and stable inflation. Check the spare as carefully as the four road tires, and pay close attention to valve stems and any tube-type setup if your chosen tire requires one. On a car of this age, a tire check should be part of a broader look at fluids, brakes, steering, and wheel hardware rather than treated as a separate task.

That extra walk-around is worthwhile because many collector-car tire issues appear after long periods of sitting rather than heavy use. A 1958 Morgan rewards preparation, and catching an aging sidewall, weak spare, or slow leak before departure is far easier than sorting it out on the shoulder miles from home.