1964 Daimler SP 250 Tires

The 1964 Daimler SP 250 is associated with two primary 15-inch tire sizes: 590-15 in bias-ply construction and 165R15 in radial construction. Both sizes are tied to the SP 250 Base, so the fitment question is less about trim level and more about which construction and sizing approach matches the car’s present wheel and setup.

That means the next step is confirming whether the car still has a wheel suited to the narrower bias-ply specification or a setup intended for radial use. Owners comparing the two should pay attention to wheel width, overall tire dimensions, and available clearance before choosing strictly by appearance or construction type.

The 1964 Daimler SP 250 uses a 15-inch rim diameter with both of its associated tire sizes. The 590-15 bias-ply size and the 165R15 radial size are both built around a 15-inch wheel, so rim diameter stays consistent even though the construction and sizing systems differ.

Rim diameter is only part of the fitment picture, however. Rim width matters as well, especially when moving between bias-ply and radial tires, so it is worth measuring the wheel already on the car rather than assuming every 15-inch wheel will suit both sizes equally well.

590-15 is a vintage numeric bias-ply tire size. The 590 identifies the nominal section width with the decimal omitted, meaning roughly 5.90 inches, and the 15 identifies the wheel diameter in inches. On the 1964 Daimler SP 250, it represents the traditional bias-ply fitment rather than a modern metric radial size.

Understanding that format helps when comparing it to 165R15 or to radial equivalents such as P165/75R15 and P175/70R15. Even when the rim diameter is the same, the change in construction and sizing convention means the wheel width and vehicle clearance should be checked before making a substitution.

590-15 is a bias-ply tire size for the 1964 Daimler SP 250. It uses the older numeric sizing format rather than a modern metric radial format, and it is the traditional construction choice among the SP 250’s associated tire options on a 15-inch rim.

That matters because a bias-ply tire affects both appearance and fitment decisions differently than a radial. Owners keeping a period-style presentation often start with 590-15, while anyone considering a radial alternative should compare the wheel width, tire dimensions, and available space around the suspension and fenders before converting.

Radial equivalents for 590-15 include 165R15 as the 80-series metric radial option, P165/75R15 as the P-metric 75-series radial option, and P175/70R15 as the P-metric 70-series radial option. These sizes give the 1964 Daimler SP 250 owner several radial paths to compare against the original-style bias-ply fitment.

Each option should still be treated as an alternative that needs confirmation on the car, not as an automatic interchange. A recommended rim-width range of 4 to 5 inches is associated with these equivalents, and the final check should include wheel width, overall dimensions, and clearance at full steering travel.

That choice depends on what matters most for the car. The 1964 Daimler SP 250 can be equipped with the traditional 590-15 bias-ply size or the 165R15 radial size, so the decision comes down to whether the goal is a more vintage tire presentation or a radial-based setup.

Bias-ply tires usually appeal to owners prioritizing period-style appearance, while radial choices open up a wider range of tire series and sidewall treatments. Before changing construction, inspect the actual wheel width, confirm the wheel condition, and make sure the selected size works with the car’s current clearance and suspension setup.

Start with the two real fitment paths for the 1964 Daimler SP 250: 590-15 bias-ply and 165R15 radial, both on 15-inch rims. From there, the important considerations are construction type, wheel-width compatibility, sidewall appearance, brand preference, and whether the car is being kept in a more restoration-oriented style or driven on a radial setup.

It also helps to compare product details that affect how the tire suits the car, such as rim-width range and load figures where they are given. The best choice is usually the one that matches the wheel already on the car, preserves needed clearance, and delivers the appearance and road use you actually want.

The 1964 Daimler SP 250 has meaningful sidewall variety across its available tire options. Depending on size and series, choices include blackwall, narrow whitewall, and wide whitewall styles, with the radial 165R15 size offering the broadest mix of visual treatments.

That makes sidewall choice an important part of the buying decision, especially on a compact British sports car where tire appearance is easy to notice. A blackwall usually gives the most understated look, while narrow and wide whitewalls create a more stylized period presentation without changing the underlying rim diameter.

Tires for the 1964 Daimler SP 250 are available from several brands, including Michelin, BFGoodrich, Firestone, Coker Classic, American Classic, Avon, and Vredestein. Most of that variety appears in the 165R15 radial size, while the 590-15 bias-ply fitment has a smaller but still useful selection.

Brand choice should be considered alongside the tire series, sidewall style, and wheel specifications rather than treated as the only decision. One owner may be focused on a blackwall radial from a European-style series, while another may want a wide-white bias-ply look that better suits the car’s visual direction.

For a period-style 1964 Daimler SP 250, the 590-15 bias-ply size is the natural starting point because it preserves the vintage numeric sizing format and traditional construction. Blackwall and wide whitewall versions are available, allowing the car to stay visually closer to an earlier sports-car presentation than a modern-looking radial choice would.

Appearance goals still vary from one restoration to another, so the final decision should balance style with the actual wheel setup and intended driving use. When exact originality matters, marque-specific references and historical vehicle documentation are worth consulting before choosing a sidewall treatment or brand purely by appearance.

Tire construction changes the visual character of a restored 1964 Daimler SP 250 as much as the sidewall style does. A 590-15 bias-ply tire gives the car a more traditional vintage presentation, while a 165R15 radial tends to look more modern in both its sizing format and the broader range of available radial series.

That does not make one choice universally right for every restoration. Some owners want the car to read as authentically vintage at a glance, while others prefer a classic radial look with narrow or wide whitewalls. The best appearance result usually comes from matching the tire to the wheel, stance, and restoration theme.

Yes, modifications can affect tire fitment on a 1964 Daimler SP 250 even when the tire size itself is associated with the car. Aftermarket wheels, changes in wheel width, suspension work, ride-height changes, or body repairs can all alter the space available around the tire and change which setup works cleanly.

That is especially important when comparing 590-15 bias-ply tires with 165R15 or other radial alternatives. A car that has been altered from original wheel or suspension dimensions should be checked for steering clearance, fender clearance, and wheel compatibility before a new set of tires is chosen.

Before driving a 1964 Daimler SP 250 on new tires, inspect the wheels for correct diameter and sound condition, verify that the tire size matches the intended setup, and confirm that inflation is set appropriately for the tires being used. It is also wise to look over the valve stems, wheel hardware, and general mounting condition.

Once the tires are installed, check for clearance at full steering lock and through normal suspension movement. A short initial drive should be followed by another inspection for air loss, rubbing, or unusual wear patterns, since classic cars sometimes reveal fitment issues only after the tires are actually on the road.

Collector-car tires on a 1964 Daimler SP 250 should be inspected regularly for cracking, bulges, cuts, uneven tread wear, and slow air loss whether the car wears 590-15 bias-ply tires or 165R15 radials. Low-mileage use does not prevent aging, so condition matters just as much as tread depth on a car that spends time in storage.

Good maintenance also includes keeping pressure consistent, storing the car away from prolonged sunlight and ozone sources, and moving it occasionally so the tires do not sit in one position for extended periods. Before any longer drive, a quick condition and pressure check is a sensible habit on a vintage sports car.