1963 Morgan Plus 4 Tires

A 1963 Morgan Plus 4 uses either a 560-15 bias-ply tire or a 155R15 radial tire. Both sizes are tied to 15-inch rims, so the fitment choice is less about wheel diameter and more about whether the car is being kept in a traditional bias-ply configuration or fitted with a radial alternative.

That distinction matters because the two sizes also change the buying decision. A 560-15 buyer will usually focus on period-style construction and sidewall presentation, while a 155R15 buyer will compare radial series, rim-width suitability, and driving use. On any Morgan that has been modified over the years, it is smart to confirm the actual wheel width and the available clearance before choosing between the two.

The 1963 Morgan Plus 4 uses a 15-inch rim with both of its primary tire sizes. That applies to the 560-15 bias-ply fitment and the 155R15 radial fitment, so the wheel diameter remains the same even though the sizing system and construction type differ.

Rim diameter is only part of the picture on a vintage sports car. Wheel width also affects which tire is appropriate, especially when comparing a narrow bias-ply tire to a radial equivalent. A Plus 4 that still has its original-style wheels may be straightforward, but any changed wheels, altered spokes, or later replacements should be measured before settling on a final tire choice.

Yes. The 1963 Morgan Plus 4 Base follows the same two fitment paths used for this model year: 560-15 in bias-ply construction and 155R15 in radial construction. There is not a separate Base-only tire size that forces a different rim diameter or a different fitment family.

That means the real decision on a Base model is how the car is being used and presented. A restoration-oriented car may stay with the narrower bias-ply look, while a road-driven car may be evaluated around the 155R15 radial route. The safest next step is confirming what is actually mounted on the car now, especially if the wheels or suspension have changed over time.

On the 1963 Morgan Plus 4, 560-15 is a bias-ply tire size. It uses a vintage numeric sizing format and represents the traditional construction choice for this car, with available blackwall, narrow whitewall, and wide whitewall options depending on the brand and tire series selected.

Choosing 560-15 usually means prioritizing traditional appearance and period-style construction. It is also important to match the tire to the wheel setup, since product specifications in this size call for specific rim-width ranges. If the car will remain close to its historical presentation, bias-ply keeps the tire format in line with the era even though a radial alternative exists.

Radial equivalents for 560-15 include 155R15 as an 80-series metric radial and 560R15 as a bias-look radial equivalent. These are two different approaches to updating a 1963 Morgan Plus 4 from a numeric bias-ply size into radial construction while staying in a 15-inch wheel format.

The difference is mainly in presentation and sizing convention. A 155R15 uses modern metric-style sizing, while 560R15 is intended to retain more of the traditional visual character associated with older tire markings. The recommended rim-width range for this equivalent path is 4 to 5 inches, and wheel width plus body and steering clearance should be checked before treating either option as suitable for a specific car.

That choice depends on what matters most for the car. A 560-15 bias-ply tire keeps the Morgan Plus 4 in a traditional tire format, while a 155R15 radial gives the car a radial construction option in the same 15-inch wheel diameter. Both fitment paths are relevant to this model year.

The practical decision comes down to appearance goals, road use, and wheel compatibility. A period-style restoration may lean toward bias-ply, especially when whitewall or traditional blackwall presentation is part of the plan. A car driven more regularly may prompt a closer look at radial options, but wheel width, clearance, suspension condition, and the current setup should all be confirmed before making the change.

Start with the role of the tire on the car. A 560-15 tire for a 1963 Morgan Plus 4 is a bias-ply fitment, so the main considerations are traditional construction, correct 15-inch wheel compatibility, and the visual style you want, whether that is blackwall, narrow whitewall, or wide whitewall.

From there, compare brand and series differences such as Firestone Classic Bias Ply, US Royal Classic Bias Ply, and Coker Classic Bias Ply, along with the rim-width figures attached to each product. It also helps to think about how the car is used. A restoration-oriented Morgan may call for one appearance, while a special-use or altered car may need closer attention to wheel width and intended driving.

The 1963 Morgan Plus 4 has meaningful sidewall variety, especially in the 560-15 bias-ply size. Blackwall, narrow whitewall, and wide whitewall versions are available there, while the 155R15 radial choices are offered as blackwall tires. That creates a clear split between appearance-focused bias-ply styling and more understated radial presentation.

Sidewall choice can change the car's visual character quickly, especially on a narrow-bodied British sports car. A blackwall usually keeps the look restrained and sporting, while whitewall options add a more formal vintage touch. Since sidewall style does not override size or wheel compatibility, the smart approach is to settle the correct tire size and construction first, then choose the sidewall treatment that suits the build.

Tires for the 1963 Morgan Plus 4 are available from Firestone, Michelin, Avon, Vredestein, US Royal, Coker Classic, and Pro-Trac. The brand mix reflects the car's split fitment story, with several radial choices in 155R15 and several bias-ply choices in 560-15, each with its own series and presentation.

Brand selection should be guided by the tire size and the character you want from the finished car rather than by name alone. Michelin, Avon, and Vredestein appear among the radial options, while Firestone, US Royal, and Coker Classic are prominent in the bias-ply range. Comparing each product's construction, sidewall style, series, and rim-width specification will be more useful than treating every brand as interchangeable.

For a period-style 1963 Morgan Plus 4, the 560-15 bias-ply tire is the natural starting point because it keeps the car in a vintage numeric tire format and preserves the traditional narrow-tire look. That size is available in blackwall, narrow whitewall, and wide whitewall versions depending on the kind of visual presentation you want.

A restoration decision should still separate period-style from exact originality. Sidewall treatment, brand, and whitewall width can all affect how authentic the car looks, but those details should be checked against marque references or other historical documentation when exact accuracy matters. If the goal is faithful visual character rather than strict historical duplication, 560-15 gives the right construction family and overall stance to build from.

Tire construction changes more than ride and handling on a restored 1963 Morgan Plus 4. A 560-15 bias-ply keeps the car in a distinctly vintage sizing and visual format, while a 155R15 radial introduces a later-style metric marking even though it remains a narrow 15-inch tire suited to the car's proportions.

That means the choice is partly visual before the car ever leaves the garage. Bias-ply tires tend to support a more traditional restoration presentation, especially with blackwall or whitewall options, while radials usually give a more understated, road-use-oriented appearance. Owners trying to balance vintage style with radial construction may also want to evaluate a bias-look radial equivalent instead of jumping straight to a modern metric look.

Yes. Modifications can affect tire fitment on a 1963 Morgan Plus 4 even when the nominal tire size looks correct on paper. Aftermarket wheels, changes in wheel width, suspension alterations, or body and fender work can all influence whether a 560-15 bias-ply or 155R15 radial remains a sensible choice for the car.

A modified Morgan should be checked at the wheel and on the car rather than judged by size code alone. Clearance around the fenders and steering components matters, and radial conversions should be reviewed carefully if the car no longer carries its original-style wheels. Measuring the actual rim width and inspecting the suspension setup will usually answer more than the tire sidewall alone can.

Before driving a 1963 Morgan Plus 4 on new tires, inspect the wheels, valve stems, and the tires themselves for proper inflation and any visible shipping or mounting damage. It is also worth confirming that the installed size matches the intended setup, whether the car is using 560-15 bias-ply tires or 155R15 radials.

Once the car is on the ground, check clearance at full steering lock and look for any contact points around the fenders or suspension. A collector car that has sat for long periods also deserves a quick review of wheel hardware, brake condition, and general chassis health before road use. That kind of inspection helps separate a simple tire change from a broader recommissioning need.

Tires on a collector 1963 Morgan Plus 4 should be maintained with regular pressure checks, visual inspections, and close attention to age-related deterioration. Whether the car wears 560-15 bias-ply tires or 155R15 radials, long periods of storage can hide sidewall cracking, flat spotting, slow air loss, and general aging that is easy to miss on a lightly used car.

Good storage conditions help as much as regular driving checks. Keeping the car away from prolonged sunlight, heat, moisture, and ozone sources can reduce unnecessary tire aging, and the tires should be inspected before any longer trip, not just at seasonal start-up. On an older sports car, tire condition deserves the same attention as fluids and brakes because all three directly affect road readiness.