1965 Daimler SP 250 Tires

A 1965 Daimler SP 250 uses two primary 15-inch tire sizes: 590-15 in bias-ply construction and 165R15 in radial construction. Both sizes apply to the SP 250 Base, so the fitment question is really about which construction and sizing system matches the car's current wheel setup and intended use.

That means the first step is confirming whether the car is being kept in a traditional bias-ply format or has been set up for radial tires. Since wheel width requirements can differ between these sizes, it is smart to verify the wheel dimensions on the car before choosing between a period-style 590-15 and a radial 165R15.

The 1965 Daimler SP 250 uses a 15-inch rim diameter with both of its primary tire sizes. Whether the car is running a 590-15 bias-ply tire or a 165R15 radial, the wheel diameter remains 15 inches, so the main differences come from tire construction and wheel-width compatibility rather than rim diameter alone.

Even with the same diameter, not every 15-inch wheel is the same in width. A 590-15 bias-ply tire is paired with a narrower rim-width range than many 165R15 radial options, so checking the actual wheel width matters before selecting a tire. That becomes especially important if the car has replacement wheels or a long-ago conversion.

On a 1965 Daimler SP 250, 590-15 is a vintage numeric bias-ply tire size. The 590 designates the nominal section width in the older inch-based sizing system, and the 15 refers to the rim diameter in inches. It is a traditional bias-ply format rather than a modern metric radial size.

For an owner, that means 590-15 points toward a more vintage tire presentation and driving character than a radial alternative. It is also useful to know that radial equivalents exist for this size, including 165R15, but they should be treated as alternatives to evaluate carefully rather than automatic substitutes for every wheel and vehicle setup.

On the 1965 Daimler SP 250, 590-15 is a bias-ply tire size. It is the vintage numeric fitment on a 15-inch rim and is offered in bias-ply series such as BFGoodrich Silvertown Classic Bias Ply and Avon Turbospeed Mk4, with blackwall and wide whitewall options available in this size.

Choosing 590-15 keeps the car in a more traditional construction style, which often appeals to owners aiming for a period-style look and feel. Before selecting one, it helps to confirm the wheel width on the car, since the 590-15 products shown here are intended for a narrower rim range than many of the radial alternatives.

Radial equivalents for 590-15 include 165R15 as an 80-series metric radial, P165/75R15 as a P-metric 75-series radial, and P175/70R15 as a P-metric 70-series radial. Among those choices, 165R15 is also a primary tire size used on the 1965 Daimler SP 250, while the others are alternative radial-equivalent formats.

These sizes should be viewed as comparison options rather than automatic replacements. The recommended rim width range tied to the 590-15 equivalents is 4 to 5 inches, so wheel width is an important checkpoint. It is also wise to compare overall tire dimensions and verify steering and body clearance before changing from the original bias-ply format.

That choice depends on what matters most for your 1965 Daimler SP 250. A 590-15 bias-ply tire preserves the car's traditional sizing format and period-style appearance, while a 165R15 radial keeps the same 15-inch rim diameter but opens up a broader range of modern radial offerings, brands, and sidewall treatments.

Bias-ply and radial tires can change the way a vintage sports car presents and responds, so the decision should match the car's restoration goals and road use. Owners considering a switch should confirm wheel width, compare the tire's dimensions to the current setup, and check clearance around the front suspension, steering, and fenders before finalizing the change.

Start with the correct primary size and construction for the car's current setup: 590-15 for bias-ply or 165R15 for radial. From there, the important differences are wheel-width compatibility, sidewall style, brand, and tire series. The Daimler's tire choice is as much about appearance and driving intent as it is about basic size.

A restoration-oriented car may lean toward the vintage look of a 590-15, while a road-driven SP 250 may point toward the broader radial selection in 165R15. Once the size is settled, compare the wheel width, load figures where listed, and the visual effect of blackwall, narrow whitewall, or wide whitewall before deciding which tire suits the car best.

The 1965 Daimler SP 250 has blackwall, narrow whitewall, and wide whitewall tire choices, depending on the size and product selected. Those sidewall treatments appear primarily in the 165R15 radial range, while the 590-15 bias-ply size is available in blackwall and wide whitewall versions.

Sidewall style affects the car's visual character as much as the size itself. Blackwalls usually give the SP 250 a more understated sports-car look, while whitewall treatments add a stronger vintage accent. Since sidewall style does not change the need for proper fitment, make the appearance decision only after confirming the right tire size and wheel compatibility.

Tires for the 1965 Daimler SP 250 are available from Coker Classic, American Classic, Firestone, BFGoodrich, Michelin, Vredestein, and Avon. Most of that brand variety appears in the 165R15 radial size, while the 590-15 bias-ply size is represented by BFGoodrich and Avon in the products offered for this application.

Brand choice should be part of a broader comparison rather than the only factor. It helps to look at which brand offers the construction type, sidewall treatment, and tire series that match the car's goals, then verify the wheel-width range and any load details tied to that product. That approach gives a clearer decision than selecting by brand name alone.

For a period-style 1965 Daimler SP 250, the 590-15 bias-ply size is the natural starting point because it preserves the car's vintage numeric sizing format and traditional construction. That route is especially relevant when the goal is to maintain the look and character associated with a mid-1960s British sports car.

The final choice still depends on how strict the restoration goal is and how the car will be used. A blackwall 590-15 offers a restrained sporting presentation, while a wide whitewall creates a different vintage look. When exact originality matters, it is worth comparing the car against marque-specific historical references before settling on a sidewall treatment.

Tire construction changes the visual tone of a restored 1965 Daimler SP 250 even when the rim diameter stays at 15 inches. A 590-15 bias-ply tire gives the car a more traditional vintage presentation, while a 165R15 radial usually reads as a later, more modern-style choice because of its metric radial sizing format and broader product selection.

That difference matters on a small British roadster, where tire profile and sidewall presentation are very noticeable. Owners aiming for a restoration-oriented look often start by deciding whether the car should retain a bias-ply appearance or shift toward a radial look. Sidewall style then fine-tunes that decision through blackwall, narrow whitewall, or wide whitewall options.

Yes, modifications can affect tire fitment on a 1965 Daimler SP 250 even when the tire size itself is correct. Changes such as aftermarket wheels, altered wheel width, suspension work, ride-height adjustments, or body repairs can all influence how a 590-15 or 165R15 tire sits in the wheel opening and clears during steering travel.

That is why a modified SP 250 should be checked as an individual car rather than judged by size alone. Measure the actual wheel diameter and width, then inspect clearance at the fenders, suspension, and steering components. Those checks matter especially when moving between bias-ply and radial construction, since wheel and tire relationships may not remain exactly the same.

Before driving a 1965 Daimler SP 250 on new tires, inspect the wheels, valve stems, and general condition of the suspension and steering components. Make sure the tires are mounted on the correct 15-inch wheels, inflated properly for the tire being used, and free from obvious issues such as bead seating problems, interference, or uneven positioning in the wheel opening.

A careful first inspection should also include turning the steering from lock to lock and checking for contact under load or movement. After the first short drive, recheck pressure and look for any rubbing marks or unusual wear. On a vintage sports car, that early inspection is one of the best ways to catch fitment problems before they become damage.

Tires on a collector 1965 Daimler SP 250 should be inspected regularly for air loss, cracking, bulges, cuts, and tread condition, even if the car is driven infrequently. Low-use collector cars can age tires without adding many miles, so condition matters just as much as tread depth on either a 590-15 bias-ply or 165R15 radial setup.

Storage habits also play a major role in tire life. Keeping the car away from prolonged sunlight, excess heat, moisture, and ozone-producing equipment helps preserve the rubber, while maintaining proper inflation reduces flat-spotting and sidewall stress. Before any longer outing, give each tire a close visual inspection and confirm that all four are holding pressure consistently.