1960 Daimler SP 250 Tires

The 1960 Daimler SP 250 is associated with two tire sizes: 165R15 in radial construction and 590-15 in bias-ply construction. Both sizes use a 15-inch rim, but they are not simply alternate labels for the same tire. They represent different sizing systems and different tire constructions, so the choice affects both appearance and setup.

The practical next step is confirming which wheel width is on the car and whether it is already set up around the radial or bias-ply fitment. A car that has been restored, re-wheeled, or converted earlier in its life may not still match the same tire path it once did, so wheel dimensions and clearance should be checked before choosing between the two sizes.

Both tire sizes associated with the 1960 Daimler SP 250 use a 15-inch rim diameter. That applies to the 165R15 radial size and the 590-15 bias-ply size, so rim diameter itself is consistent even though the tire constructions and width requirements differ between the two fitment paths.

Rim diameter is only the first part of the fitment picture. Wheel width also matters, especially if the car is moving between a narrow bias-ply setup and a radial setup with a broader approved rim-width range. Measuring the wheels already on the car is worthwhile before selecting tires, particularly if the SP 250 has seen aftermarket wheel changes or a long-ago restoration.

On a 1960 Daimler SP 250, 590-15 is a numeric bias-ply size. The 590 designation represents an approximate 5.90-inch nominal section width, while 15 refers to the rim diameter in inches. It is an older sizing convention that looks very different from a modern metric radial code but was common on sports cars and specialty cars of this era.

Understanding that format helps separate a true bias-ply size from a modern radial equivalent. A 590-15 tire keeps the traditional construction and appearance associated with this older sizing system, while a 165R15 or other radial alternative changes both the code format and the tire type. That makes wheel width, clearance, and the intended look of the finished car important parts of the decision.

For the 1960 Daimler SP 250, 590-15 is a bias-ply tire size. It uses the older numeric sizing system rather than the later metric radial format, and the available products tied to that size are bias-ply designs. The radial fitment associated with this car is 165R15, which is a separate size and construction.

That distinction matters because construction affects both the look of the car and the wheel requirements you need to confirm. A bias-ply setup suits a more traditional presentation, while a radial setup changes the tire type even when the rim diameter remains 15 inches. Before switching, it is smart to verify wheel width, tire clearance, and whether the car has already been converted in the past.

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. Those are three distinct ways to approach a radial alternative, ranging from a classic Euro-metric format to progressively lower-profile P-metric options.

The recommended rim-width range for the equivalent setup is 4 to 5 inches, which makes wheel measurement especially important before choosing among them. An equivalent size can be a useful alternative, but it should still be checked against the SP 250’s wheel width, overall tire dimensions, and available clearance rather than treated as an automatic substitution.

Start with the basics: confirm the wheel diameter is 15 inches, measure actual wheel width, and compare the radial size you are considering against the car’s current tire dimensions and clearances. For a 590-15 conversion path, the radial-equivalent choices include 165R15, P165/75R15, and P175/70R15, with a recommended rim-width range of 4 to 5 inches.

A conversion also deserves a close look at steering clearance, fender clearance, suspension condition, and how the car will be used. Some owners prioritize a traditional bias-ply presentation, while others want a radial setup that still looks appropriate on a vintage British sports car. Checking the actual wheel and chassis setup on the car matters more than relying on the model name alone.

A 165R15 choice for the 1960 Daimler SP 250 starts with confirming that the car is being run on the radial fitment path rather than the 590-15 bias-ply path. From there, the useful comparisons are sidewall style, tire series, brand, and approved rim-width range. Available 165R15 options include blackwall, narrow whitewall, and wide whitewall designs in several vintage-oriented radial lines.

The best comparison approach is to match the tire to the car’s intended look and use. A blackwall radial can give the SP 250 a more understated presentation, while narrow or wide whitewalls push the appearance in a more decorative direction. Wheel width should be checked closely, especially since 165R15 products span more than one approved rim-width range depending on the exact tire.

Tires for the 1960 Daimler SP 250 are available in blackwall, narrow whitewall, and wide whitewall styles. That variety appears across the two fitment paths, with blackwall and wide whitewall options in 590-15 bias-ply, and blackwall plus both whitewall treatments in the 165R15 radial size.

Sidewall choice shapes the car’s finished presentation just as much as brand or series. A blackwall usually keeps the look restrained and sporting, while whitewalls add a more formal or visually prominent period flavor. Since appearance preferences vary from one restoration to another, it helps to decide on the visual goal first and then narrow the field to the correct size and wheel compatibility.

The 1960 Daimler SP 250 has tire options from BFGoodrich, Avon, Coker Classic, American Classic, Firestone, Michelin, and Vredestein. Brand availability depends on the size and construction you choose, with 590-15 bias-ply options appearing in a smaller group and 165R15 radial options spanning a broader mix of brands and tire series.

Brand should be compared alongside size, construction, sidewall style, and wheel fitment rather than treated as the only decision point. Some owners start with a visual target such as blackwall or whitewall, while others begin with a radial or bias-ply preference. Once those choices are settled, the available brands become easier to compare within the correct tire family for the car.

A period-style approach for a 1960 Daimler SP 250 often starts with the 590-15 bias-ply size, since it preserves the older numeric sizing format and traditional construction. The 165R15 radial size can also suit a vintage presentation, especially when the goal is to keep a narrow, classic-looking tire while using radial construction.

The right choice depends on whether the project leans more toward traditional appearance or toward radial road use with vintage character. Sidewall treatment matters as well, since blackwall, narrow whitewall, and wide whitewall options can change the car’s personality noticeably. When exact originality is important, marque-specific historical references and restoration records are worth checking before settling on a final look.

On a restored 1960 Daimler SP 250, tire construction changes more than ride feel alone. A 590-15 bias-ply setup keeps the older sizing language and a more traditional visual character, while a 165R15 radial gives the car a later-style tire format even though it still remains appropriately narrow for the period.

That difference becomes more noticeable once sidewall style enters the picture. Blackwall tires tend to keep the SP 250 looking lean and sporting, while whitewall versions bring a more decorative period impression. A restoration-focused owner should think about the complete stance of the car, including wheel width and sidewall treatment, rather than treating construction as a purely mechanical decision.

Yes, modifications can affect tire fitment on a 1960 Daimler SP 250 even when the nominal tire size stays within the known 15-inch fitment range. Aftermarket wheels, wheel-width changes, suspension work, altered ride height, or body repairs can all change how a 165R15 radial or 590-15 bias-ply tire sits in the car’s wheel openings.

A modified SP 250 should be checked for more than rim diameter alone. Wheel width, inner and outer clearance, steering travel, and the relationship between the tire and fender edges all deserve attention before committing to a set. That is especially important when moving from the narrow bias-ply fitment path to a radial alternative with different construction and approved wheel-width requirements.

Before driving a 1960 Daimler SP 250 on new tires, inspect wheel condition, verify tire pressure, and make sure the tires seat properly on the rims being used. It is also wise to check that the chosen size matches the car’s intended fitment path, whether that is 590-15 bias-ply or 165R15 radial, and to confirm there is no interference at full steering lock.

A brief follow-up inspection after the first few drives is just as useful. Look for any signs of rubbing, uneven contact, air loss, or unusual wear, and make sure the car tracks cleanly without clearance issues over bumps and turns. On a collector car like the SP 250, small setup problems can go unnoticed for a long time if the car is only driven occasionally.

Tires on a collector 1960 Daimler SP 250 should be inspected regularly for pressure loss, sidewall cracking, bulges, cuts, and tread condition, even if the car is driven only occasionally. Low-use collector vehicles can carry aging tires for years, so condition matters just as much as remaining tread depth on either the 590-15 bias-ply or 165R15 radial setup.

Storage habits make a real difference over time. Keeping the car away from prolonged sunlight, excess heat, moisture, and ozone sources helps preserve tire condition, while periodic movement can reduce flat-spotting from long stationary periods. It also helps to recheck tire condition before any longer outing, since a vintage roadster may spend weeks or months between drives.