1964 Morgan Plus 4 Tires

A 1964 Morgan Plus 4 can use 155R15, 560-15, 165R15, or 590-15, depending on the sub-model and tire construction. The Base model uses the narrower pairing of 155R15 radial or 560-15 bias-ply, while the Plus model uses the wider pairing of 165R15 radial or 590-15 bias-ply.

That means the first job is confirming whether the car is a Base or Plus and whether it is staying with its present construction type. A 15-inch rim is common across the fitments, but size, wheel width, and overall setup still need to match the tire being considered, especially if the car has been changed over time.

The 1964 Morgan Plus 4 uses 15-inch rims with all four primary tire sizes associated with this model year. That includes the 155R15 and 165R15 radial sizes as well as the 560-15 and 590-15 bias-ply sizes, all built around the same 15-inch wheel diameter.

Shared rim diameter does not mean every tire choice belongs on every wheel or every sub-model. Wheel width should still be checked against the tire being considered, and that becomes especially important when moving between a narrower Base-model fitment and the wider Plus-model fitment or when considering a radial alternative for a bias-ply setup.

No. The 1964 Morgan Plus 4 Base and 1964 Morgan Plus 4 Plus do not use the same tire-size pairings. The Base is associated with 155R15 radial and 560-15 bias-ply fitments, while the Plus is associated with 165R15 radial and 590-15 bias-ply fitments.

That difference matters because a buyer should not choose a tire by year, make, and model alone when both sub-models are in play. Confirming the exact sub-model, checking the actual wheel size and width on the car, and noting whether it is already running bias-ply or radial tires will prevent the most common ordering mistakes.

For a 1964 Morgan Plus 4 using the 560-15 bias-ply size, the available radial equivalents are 155R15 and 560R15. The 155R15 option is an 80-series metric radial, while 560R15 is a bias-look radial intended to retain a more traditional visual character than a modern-looking metric radial.

Those options give two different directions: a conventional Euro-metric radial or a radial built to echo the look of a vintage bias tire. The recommended rim-width range associated with the 560-15 equivalency is 4 to 5 inches, and overall wheel setup, body clearance, and suspension condition should be checked before making the change.

For a 1964 Morgan Plus 4 using 590-15 bias-ply tires, the radial equivalents are 165R15, P165/75R15, and P175/70R15. Those choices represent an 80-series metric radial, a 75-series P-metric radial, and a 70-series P-metric radial, giving three distinct radial sizing formats tied to the original bias-ply fitment.

The practical difference is not just the number on the sidewall but the sizing convention and profile family behind it. A recommended rim-width range of 4 to 5 inches is associated with the 590-15 equivalency, so wheel width, tire clearance, and the car's actual stance should all be verified before selecting one of these radial alternatives.

Start by confirming the car's exact sub-model and original bias-ply size, because a Base-model 560-15 conversion points to different radial options than a Plus-model 590-15 conversion. The next checks are wheel diameter, wheel width, and whether the car's current wheel and tire package matches the size being considered.

Construction changes should also be evaluated in the context of the whole car, not just the tire itself. Steering clearance, fender clearance, suspension condition, and the vehicle's intended use all matter, especially on a light, narrow-bodied sports car where small fitment differences can be noticeable once the car is back on the road.

The most important consideration is matching the tire to the correct sub-model and construction type. A 1964 Morgan Plus 4 Base uses a different size pairing than a Plus model, and each sub-model offers both a bias-ply route and a radial route on 15-inch rims.

Once size is settled, the real comparison becomes appearance, wheel compatibility, and intended road use. Some buyers want a traditional bias-ply presentation, while others want a radial in a narrow classic size. Sidewall style, tire series, and rim-width suitability should all be reviewed before narrowing the choice to one product.

Sidewall choices for the 1964 Morgan Plus 4 include blackwall, narrow whitewall, and wide whitewall, depending on the tire size selected. Radial offerings in 155R15 are primarily blackwall, while 165R15 adds both narrow and wide whitewall options. Bias-ply choices in 560-15 and 590-15 also include blackwall and whitewall treatments.

That makes sidewall style part of the buying decision rather than a minor cosmetic detail. A blackwall usually gives a more understated sports-car look, while whitewall options create a more decorative, restoration-oriented presentation. The right choice depends on the tire size the car actually uses and the appearance the owner wants to achieve.

Brands available in 1964 Morgan Plus 4 fitments include Firestone, Michelin, Avon, Vredestein, BFGoodrich, American Classic, US Royal, Coker Classic, and Pro-Trac. The exact brand mix varies by size, with the broader 165R15 radial fitment carrying the widest assortment of brand and series choices.

Brand selection should be filtered through the correct tire size first, because the car's Base and Plus sub-models do not share the same fitment pairings. After that, compare the available series, sidewall style, and wheel-width suitability within the correct size instead of trying to choose a brand before confirming the underlying fitment.

A period-style 1964 Morgan Plus 4 usually starts with the correct primary size for the sub-model, then a decision between bias-ply and radial construction. The Base model's period-style bias-ply size is 560-15, while the Plus model's is 590-15, both of which preserve the narrow vintage proportions associated with the car.

From there, the visual character comes from the sidewall treatment and overall presentation rather than the size alone. Buyers pursuing strict historical accuracy should compare their car against marque references or restoration documentation, while those pursuing a traditional look can choose the construction and sidewall style that best matches the finished car.

Tire construction changes more than road feel on a restored 1964 Morgan Plus 4; it also affects the car's visual attitude. A bias-ply tire keeps a distinctly vintage presentation, while a radial in 155R15 or 165R15 gives a more modern sidewall format even when offered in classic blackwall or whitewall styles.

That difference becomes especially noticeable on a small British roadster with exposed fenders and narrow wheels. Owners who want a traditional restoration look often begin by choosing the correct sub-model size and then deciding whether visual authenticity or radial convenience matters more in the finished appearance of the car.

Yes. Modifications can affect tire fitment on a 1964 Morgan Plus 4 even when the tire size itself appears correct. Aftermarket wheels, changes in wheel width, suspension alterations, ride-height changes, or body and fender work can all alter the space available for the narrow 15-inch tires used on this car.

That matters most when moving between bias-ply and radial constructions or between the Base and Plus size pairings. A car that has been changed over the years should be measured as it sits now, with attention to steering travel and body clearance, rather than assuming the original year-and-model fitment still matches the current setup.

Before driving a 1964 Morgan Plus 4 on new tires, inspect the wheels for correct diameter and condition, confirm that the mounted size matches the car's sub-model, and check inflation pressure carefully. It also makes sense to look over the suspension, steering components, and brake hardware on a low-production vintage sports car before heading out.

A short test drive should include attention to straight-line tracking, steering clearance at full lock, and any signs of rubbing once the car is loaded and moving. Collector vehicles that sit for long periods can reveal unrelated mechanical issues at the same time new tires are installed, so a cautious first outing is the smart approach.

Tires on a collector 1964 Morgan Plus 4 should be maintained with regular pressure checks, routine visual inspections, and careful storage habits. Sidewall cracking, tread separation, bulges, cuts, and slow air loss deserve attention even when the car sees limited mileage, because age and storage conditions can matter as much as tread wear.

Keeping the car away from prolonged sunlight, moisture, and ozone sources helps preserve the tires between drives. It is also wise to recheck the tires before any longer outing, since a classic Morgan may spend more time parked than driven, and long idle periods can hide developing condition issues until road use begins again.