1964 Morgan Tire Fitment Guide

1964 Morgan vehicles use four tire sizes across two model lines: 155R15, 560-15, 165R15, and 590-15. The 4-4 Series uses 155R15 and 560-15, while the Plus 4 uses those same two shared sizes plus 165R15 and 590-15. All four sizes mount on 15-inch wheels. Rim-width coverage varies by size and tire, with 155R15 commonly fitting 4.00 to 5.50 inches, 560-15 fitting 4.5 to 5.50 inches, 165R15 fitting 4.50 to 6.00 inches, and 590-15 fitting 4.00 to 4.50 inches where that fitment range is stated.

That means year and make alone are not enough for every 1964 Morgan purchase. A 4-4 Series owner can focus on the two shared sizes, while a Plus 4 owner should first determine whether the car should stay with one of the common fitments or use one of the larger Plus 4-specific options. Before ordering, check the actual wheel width on the car and compare it to the tire you want, especially if the vehicle has been restored, modified, or fitted with replacement wheels over the years.

On a 1964 Morgan, 560-15 is a numeric bias-ply size. The 5.60 portion refers to nominal section width in inches, and the 15 identifies the wheel diameter in inches. It is a traditional sizing system used widely before metric radial sizing became common, and on 1964 Morgan applications it appears as a shared fitment for both the 4-4 Series and the Plus 4.

That older numeric code matters because it points you toward a period-style tire rather than a modern metric radial. If your goal is a more authentic restoration look and the characteristic feel of a bias-ply sports car, 560-15 is often the direction to explore. It is also available in different sidewall appearances, including narrow and wide whitewalls, so the right choice may depend not only on fitment but also on whether you are building a restrained driver, a show-focused car, or a market-specific presentation.

On a 1964 Morgan, 155R15 is a metric radial size. The 155 is the nominal section width in millimeters, the R identifies radial construction, and the 15 is the rim diameter in inches. Because no aspect ratio is printed in that older euro-metric style, it is conventionally treated as an 80-series radial. This size is used on both the 4-4 Series and the Plus 4.

That makes 155R15 one of the most approachable choices for owners who want a narrow, classic-looking radial on a 15-inch Morgan wheel. It is also a size where details matter once you move past the basic code, because some versions are tube type, some are tubeless, and speed ratings can differ between products. If your car sees regular road use, the size code alone is only the first step; the exact sidewall marking and construction details deserve a closer look.

For a 1964 Morgan, the choice between 155R15 and 560-15 is mainly a choice between radial and bias-ply construction rather than a change in wheel diameter, since both fit 15-inch wheels and both are used on the 4-4 Series and Plus 4. The 155R15 is a euro-metric radial, while the 560-15 is a traditional numeric bias-ply. Each points the car in a slightly different direction in terms of feel, appearance, and how closely it follows period convention.

Owners building a car for original-style presentation often lean toward the bias-ply 560-15 because it matches the era more naturally. Owners who want a more familiar road-going character on modern pavement often consider the radial 155R15 first. Neither decision should be made in isolation, though, because wheel width, sidewall style, and tube-versus-tubeless construction still need to match the specific tire and the way the car will actually be used.

1964 Morgan tire choices cover blackwall, narrow whitewall, and wide whitewall styles, depending on size. The 155R15 radial choices here are blackwall only. The 560-15 bias-ply options come in narrow and wide whitewall versions, the 165R15 radial choices include blackwall, narrow whitewall, and wide whitewall versions, and the 590-15 bias-ply options include blackwall and wide whitewall styles.

For many 1964 Morgan owners, sidewall style is as much an authenticity decision as a visual one. A blackwall usually reads as the most understated sporting look on a British roadster of this period, while whitewalls can suit a particular restoration theme or owner preference. If show presentation matters, confirm what is appropriate for your market, event, and trim presentation before choosing a sidewall treatment, since judges and marque specialists often notice construction and sidewall appearance together rather than separately.

1964 Morgan tire fitments are covered by Firestone, Michelin, US Royal, Coker Classic, American Classic, BFGoodrich, and Avon. In 155R15, the available brands are Firestone and Michelin. In 560-15, the available brands are Firestone and US Royal. In 165R15, the available brands are Coker Classic, American Classic, Firestone, and BFGoodrich. In 590-15, the available brands are BFGoodrich and Avon.

That spread gives Morgan owners a meaningful choice between traditional nameplates, specialty reproduction lines, and a mix of sidewall appearances within the same year and make. Brand selection should follow your actual goal: a restrained blackwall radial, a whitewall radial, or a more traditional bias-ply presentation. Once you narrow the size first, comparing brands becomes much easier because you can judge them in the context of the same wheel diameter, the same basic fitment, and the same intended use for the car.

1964 Morgan tire rim-width requirements vary by size. The 155R15 radial fitments commonly suit 4.00 to 5.50-inch rims. The 560-15 bias-ply fitments cover 4.5-inch rims on some versions and 4.50 to 5.50 inches on others. The 165R15 radial fitments span 4.50 to 6.00 inches, while 590-15 bias-ply fitments fit 4.00 to 4.50-inch rims where that range is stated.

That variation matters because all 15-inch wheels are not interchangeable from a tire standpoint. A Plus 4 owner comparing 165R15 and 590-15, for example, should pay close attention to wheel width before moving between those sizes. Even when a tire and wheel share the same 15-inch diameter, an unsuitable rim width can alter profile, steering feel, and overall fit. Measuring the wheel already on the car is the safest way to narrow the choice before selecting a tire.

Inner-tube requirements on 1964 Morgan tires depend on the exact size and product. In 155R15, tube status varies by product, with both TT and TL versions present among Michelin offerings and a radial option that does not carry a tube marking in the size itself. The 560-15, 165R15, and 590-15 products here do not all state tube type in the same way, so the sidewall marking on the specific tire deserves confirmation before installation planning.

That means tube choice should never be assumed solely from the size code. On vintage British wheels, the wheel design itself can also affect whether a tube is appropriate, even when a tire is available in tubeless form. The practical approach is to confirm the tire marking, inspect the wheel condition, and decide tube use as part of the wheel-and-tire package rather than as an afterthought. It is especially important on a car that has changed wheels during restoration or long-term ownership.

All four 1964 Morgan tire sizes here use a 15-inch rim diameter, so original 15-inch Morgan wheels can remain in the conversation across the full range. Diameter compatibility alone, however, does not settle the matter, because the approved rim-width range changes from one size to another. The broadest fitment span appears in 165R15 at 4.50 to 6.00 inches, while 590-15 is much narrower at 4.00 to 4.50 inches where rim-width guidance is stated.

In practical terms, a shared wheel diameter makes cross-shopping easier, but wheel width still decides whether a given size is a sound match. A 4-4 Series owner choosing between 155R15 and 560-15 may find overlap, while a Plus 4 owner comparing 165R15 against 590-15 should verify wheel width carefully before switching. Original wheels can often stay in place, but the decision should be made with actual measurements rather than assumption, especially on a sixty-year-old car.

A stored 1964 Morgan should be kept out of direct sunlight, away from electric motors or other ozone sources, and in a cool, dry space where moisture does not sit against the tires. Clean tires with mild soap and water rather than solvent dressings, and keep inflation pressure at a stable level during storage. On a low-use collector car, periodic movement helps prevent flat-spotting, especially with bias-ply tires such as 560-15 and 590-15, which tend to show storage effects sooner than radials.

If the car will sit for an extended season, move it occasionally or support it in a way that reduces static loading without leaving the suspension hanging unnaturally. A Morgan’s light weight helps, but long stationary periods still age the tires even when tread looks fresh. Storage habits matter just as much as mileage on specialty tires, and they directly influence how the car feels when it returns to the road after a winter layup or a lengthy restoration pause.

Tires on a 1964 Morgan usually age out before they wear out, because collector cars often cover limited annual mileage. A sound rule is to begin evaluating them closely after about five to seven years and to treat the ten-year point as a serious replacement threshold regardless of remaining tread. The DOT date code, sidewall condition, and any signs of hardening or cracking matter more than miles traveled on a low-use sports car.

That age-based approach is especially important on a vintage Morgan because the car may spend long periods parked, and infrequent use can hide deterioration until the next touring event or weekend drive. A tire that still looks visually acceptable from across the garage can be too old for confident road use. Keeping a simple age log for all five tires, including the spare, is one of the easiest ways to avoid relying on memory or tread depth alone.

Tires on a 1964 Morgan deserve a quick inspection before every drive and a more thorough inspection before any extended outing. Check inflation pressure, visible cracking, cuts, bulges, uneven wear, and any evidence that the car has been sitting on a partially deflated tire. If your chosen tire is tube type, include the valve stem and any signs of slow leakage in that routine, since tube-related issues can appear even when tread still looks healthy.

A pre-drive walkaround is especially worthwhile on a lightly used British sports car because long periods between outings can turn a small issue into a roadside interruption. Collector tires often age quietly, and the first sign may be sidewall weathering, air loss, or a change in how the car tracks. A few minutes of inspection before a drive is far easier than trying to solve a tire problem after the car is warmed up and already away from home.

A 1964 Morgan Plus 4 would have been a period car from the era when bias-ply construction was still standard practice on many sports cars, even as radial adoption was becoming more common. Within the fitments used on the Plus 4 here, both bias-ply sizes and radial sizes appear, all on 15-inch wheels. That makes historical correctness a matter of both model fitment and the exact restoration target, rather than a simple one-size answer for every Plus 4.

For strict originality work, construction type and sidewall appearance should be checked against factory literature, surviving original cars, and Morgan marque specialists. A radial may be a sensible road-use choice, but it does not present the same visual or judging impression as a bias-ply tire on a car being restored to period standards. If your Plus 4 is headed for concours judging, treat the size on the car today as a clue rather than final proof of what belongs there.

Correct tire fitment matters on a 1964 Morgan because judges and knowledgeable enthusiasts often look at size, construction, and sidewall style together. A blackwall radial and a whitewall bias-ply can both fit a 15-inch Morgan wheel, but they communicate very different restoration choices. On a car judged for authenticity, modern radial construction where a period-style bias-ply is expected can stand out just as clearly as an incorrect sidewall treatment or an unusually wide visual profile.

That does not mean every show car must use the same tire, but it does mean your event standard should guide the decision. Club touring, local display, and marque concours can each apply authenticity differently. Before finalizing tires for a show-focused Morgan, compare your intended size and sidewall style against period photographs, factory references, and Morgan club guidance. The right answer for a driver restoration is not always the right answer for a points-judged car.

For a 1964 Morgan in 155R15, Michelin X and Michelin XAS are both radial choices, but they differ in sidewall marking details and speed/tube specifications. Michelin X appears as a 155R15 82T TL, making it a tubeless T-rated tire with a 118 mph speed ceiling. Michelin XAS appears as a 155HR15 82H TT, making it a tube-type H-rated tire with a 130 mph speed ceiling. Both use a 15-inch rim, and the XAS also carries a stated 4.00 to 5.50-inch rim-width range.

That makes the choice less about basic fitment and more about the kind of reproduction radial you want on the car. The X can suit an owner who wants a straightforward blackwall radial with tubeless construction, while the XAS brings a different specification profile that may appeal to owners chasing a particular period-European character. Because both share the same nominal size family, the deciding factors become wheel suitability, tube plan, and how closely the tire’s specification aligns with your restoration or driving goal.

1964 Morgan tires can be suitable for highway driving when they are in good condition, properly inflated, correctly matched to the wheel, and used within their construction and speed-rating limits. Among the radial 155R15 options, T and H ratings appear, corresponding to 118 mph and 130 mph. In the 590-15 bias-ply size, an H-rated Avon version also reaches 130 mph. Other sizes here do not always carry an explicit speed letter in the available marking.

On a 1964 Morgan, tire speed capability is only part of the highway picture. The car’s vintage braking, suspension, steering feel, and overall mechanical condition often matter more in normal U.S. highway use than the tire’s theoretical top-speed ceiling. Safe road use starts with age, condition, pressure, and fitment, then extends to realistic driving expectations for a lightweight British sports car from the mid-1960s rather than a modern grand-touring machine.

Inflation pressure on 1964 Morgan tires depends on the exact size and tire design rather than on year and make alone. Load-and-pressure figures here include 155R15 at 1045 pounds at 44 psi on one radial, 560-15 at 970 pounds at 32 psi, 165R15 at 1168 pounds at 35 psi or 1170 pounds at 36 psi depending on the tire, and 590-15 at 1050 pounds at 32 psi on the BFGoodrich versions. Those figures reflect tire capacity ratings, not necessarily the factory running pressure Morgan recommended for the car.

For actual use, start with the vehicle manufacturer’s recommended inflation pressure if you have the owner’s literature or a trusted Morgan reference, then compare it with the tire maker’s guidance for the specific product. Do not transfer a pressure value from one size to another simply because the wheel diameter matches. Pressure is part of the tuning of ride, response, and wear on a light sports car, so it should be set for the exact tire and the car’s actual use.

Before a longer drive in a 1964 Morgan, inspect each tire for cracking, cuts, bulges, embedded debris, irregular wear, and stable inflation pressure. Check that the spare is usable and aired up, and if your tire setup uses tubes, include the valve stems and any signs of leakage in the inspection. A tire that has sat through long storage should also be checked for flat-spotting or age-related hardening before the trip begins.

That tire inspection should be part of a broader pre-drive look at the car’s mechanical condition, because a vintage Morgan asks more of the owner than a modern daily driver. Tires are the only part touching the road, but their condition has to be considered alongside brakes, steering, suspension, and wheel security. A careful check before departure is especially important if the car sees intermittent use, since age and storage can change tire condition even when mileage remains very low.