1957 Daimler Conquest Tires

The 1957 Daimler Conquest uses two primary tire sizes: 600-15 in a bias-ply construction and 175R15 in a radial construction. Both are 15-inch fitments, so the main distinction is not wheel diameter but tire type and sizing format.

That means the first decision is whether the car is being kept in a traditional bias-ply configuration or set up around radial tires. Checking the actual wheels on the car still matters, especially on a collector vehicle that may have been changed over the years, because rim width, tire clearance, and overall stance should all be verified before settling on one construction.

The tire fitments used on the 1957 Daimler Conquest are built around a 15-inch rim diameter. Both the 600-15 bias-ply size and the 175R15 radial size share that same 15-inch wheel diameter, which keeps the basic wheel-size question fairly simple.

Even with the same rim diameter, wheel compatibility is not only about the number 15. A buyer should also confirm the wheel's actual width and inspect whether the car still has its original wheel setup, since radial and bias-ply tires can have different wheel-width preferences and a changed wheel can affect both fitment and tire selection.

The 1957 Daimler Conquest Drop-Heard Coupe uses the same overall fitment choices as the model covered here: 600-15 in bias-ply form and 175R15 in radial form. The sub-model does not introduce a separate rim diameter or a unique size outside those two options.

That keeps sub-model identification from becoming the main obstacle, but the construction choice is still important. Owners should decide whether the car's purpose favors a more traditional bias-ply look or a radial setup, then confirm the wheel width and physical clearance before choosing a specific tire within the appropriate size.

On the 1957 Daimler Conquest, 600-15 is the bias-ply tire size. It uses the older numeric sizing format common to the period, and available tires in this size include BFGoodrich Silvertown Classic Bias Ply products in blackwall and wide whitewall styles.

That makes 600-15 the natural starting point when the goal is a traditional period-style presentation. Buyers considering a move away from bias-ply construction should not assume every radial alternative behaves the same on the car, because wheel width, tire dimensions, and the vehicle's current setup all need to be checked before changing construction.

Radial equivalents for 600-15 include 165R15, P165/75R15, and P175/70R15. Those options represent an 80-series metric radial, a 75-series P-metric radial, and a 70-series P-metric radial, giving the 1957 Daimler Conquest several different radial sizing conventions to consider.

A recommended rim-width range of 4 to 5 inches applies to those equivalents, which helps frame the wheel check before any conversion. The practical next step is comparing the wheel width already on the car and confirming that section width, overall dimensions, and clearance around the fenders and suspension remain appropriate for the chosen radial size.

Start by confirming which original size the car is using and which radial size is being considered in its place. For a 600-15 bias-ply fitment, the radial-equivalent choices are 165R15, P165/75R15, and P175/70R15, and the wheel should fall within the 4 to 5 inch recommended rim-width range.

A conversion also calls for a close look at the car's actual condition and configuration. Steering clearance, fender space, suspension height, and wheel width should all be inspected, especially if the Daimler has seen wheel changes or other modifications during its life, because an equivalent size still needs to suit the vehicle's specific setup.

The main considerations are keeping the correct 600-15 size, confirming that a bias-ply tire suits the car's current setup, and deciding what appearance you want from the sidewall. In this size, the available BFGoodrich Silvertown Classic Bias Ply choices include both blackwall and 2.625-inch wide whitewall versions.

Beyond appearance, compare rim-width compatibility and load specification before making a final choice. A collector car can carry replacement wheels, alignment changes, or suspension wear that alter how a tire sits, so it is smart to verify the wheel dimensions and inspect clearance at full steering angle rather than choosing only by period-style looks.

For the 600-15 bias-ply fitment on a 1957 Daimler Conquest, available sidewall styles include blackwall and wide whitewall. The wide whitewall offering uses a 2.625-inch whitewall, while the blackwall version keeps a more understated and utilitarian period look.

That choice is mostly about presentation rather than basic size, but it can strongly influence how the car reads visually. Owners pursuing a more formal restoration-oriented appearance may lean toward the whitewall, while a blackwall can suit a simpler or more restrained look, provided the tire still matches the car's wheel and construction requirements.

The 600-15 product options for the 1957 Daimler Conquest are offered in the BFGoodrich Silvertown Classic Bias Ply series. That series keeps the selection focused, so the choice is less about switching between multiple vintage series and more about selecting the sidewall treatment and matching the tire to the car's intended use.

Because the available products stay within one bias-ply family, buyers should look closely at the details that still vary, such as blackwall versus wide whitewall and the wheel-width range each tire supports. That approach helps narrow the tire by appearance and compatibility instead of assuming every 600-15 option is the same.

A 600-15 bias-ply tire is the natural period-style starting point for a 1957 Daimler Conquest because it uses the vintage numeric sizing format and traditional construction associated with the era. That makes it the better fit when the goal is to preserve an older visual character rather than move the car toward a more modern radial presentation.

Within that size, the sidewall decision becomes part of the restoration story. A blackwall and a 2.625-inch wide whitewall are both available, but exact originality can depend on the car's history and market specification, so buyers concerned with strict restoration accuracy should compare their choice with marque references and period documentation.

Tire construction changes more than road feel on a restored 1957 Daimler Conquest; it also changes the car's overall visual impression. A 600-15 bias-ply keeps the older sizing language and traditional tire presentation, while a 175R15 radial introduces a more modern construction and a different visual character even though it stays on a 15-inch rim.

That difference matters most when the restoration goal is tied closely to period appearance. Buyers who want the car to read as a mid-1950s saloon often begin with the bias-ply fitment, while those prioritizing radial construction should still judge how the tire's proportions and sidewall style look against the wheel, body lines, and stance.

Yes, modifications can affect tire fitment on a 1957 Daimler Conquest even when the nominal tire size appears correct. Changes such as aftermarket wheels, altered wheel width, suspension work, ride-height adjustments, or body repairs can all influence how a 600-15 or 175R15 tire sits within the available space.

That is why an older car should be checked as it currently exists, not only by original fitment assumptions. Measuring wheel diameter and width, looking at steering travel, and inspecting fender and suspension clearance can prevent problems that only show up once the car is loaded, turning, or driven at normal road speed.

Before road use, inspect the tire pressure, make sure each tire is seated properly on the wheel, and look over the rest of the chassis for issues that can affect drivability. On a 1957 Daimler Conquest, that also means confirming that the selected 600-15 or 175R15 tires clear the body and suspension through the full steering range.

A new tire cannot compensate for poor wheel condition, worn steering parts, or neglected suspension components. It is also wise to check for uneven ride height, loose fasteners, and any sign of rubbing after a short initial drive, since collector cars often reveal fitment issues only once they are back in regular motion.

600-15 tires on a collector 1957 Daimler Conquest should be kept properly inflated, inspected regularly for cracking, bulges, cuts, and uneven tread wear, and watched for slow air loss between drives. Bias-ply tires also deserve periodic visual checks even when the car covers limited mileage, because age and storage conditions matter as much as use.

Storage plays a major role in long-term condition. Keeping the car away from prolonged sunlight, excess heat, moisture, and ozone sources helps protect the rubber, and occasional inspections of the wheels and valve stems are worthwhile as well, since a little preventive attention can preserve both safety and the tire's appearance.