1964 Daimler 2.5 Litre Tires

The 1964 Daimler 2.5 Litre uses two primary 15-inch tire sizes: 640-15 in bias-ply construction and 185R15 in radial construction. Those are two different fitment directions rather than two versions of the same tire code, so the first step is deciding whether the car is staying with a traditional bias-ply setup or using a radial arrangement.

That distinction affects more than appearance. Bias-ply and radial tires can call for different wheel-width considerations and can change the car’s presentation and road feel. Before ordering, confirm the wheel diameter is still 15 inches, check actual wheel width, and inspect for any earlier changes that may have altered the Daimler from its expected tire setup.

The 1964 Daimler 2.5 Litre uses a 15-inch rim diameter with both of its primary tire sizes. That means both the 640-15 bias-ply option and the 185R15 radial option are built around the same basic wheel diameter, even though the sizing systems and construction types are different.

Matching the 15-inch diameter is only the starting point. Wheel width still needs to be checked, especially if the car has been restored, modified, or fitted with replacement wheels at some point in its life. A tire can share the correct rim diameter and still deserve a closer look for rim-width suitability, sidewall profile, and body or steering clearance.

640-15 is a numeric bias-ply tire size. In that format, the 640 refers to the tire’s nominal section width class, roughly 6.40 inches, and the 15 identifies the wheel diameter in inches. On a 1964 Daimler 2.5 Litre, it represents the traditional bias-ply fitment path for owners who want a more vintage-style tire construction.

Modern buyers often recognize metric radial sizing more easily, so 640-15 can seem unfamiliar at first glance. The practical point is that this is not a radial code and it should be chosen as part of a bias-ply setup. Buyers comparing it with radial alternatives should verify wheel width, intended use, and the kind of appearance they want from the finished car.

On the 1964 Daimler 2.5 Litre, 640-15 is a bias-ply tire size. It is the vintage numeric bias-ply fitment, while 185R15 represents the radial fitment path for the same 15-inch rim diameter. That makes 640-15 the traditional construction choice if the goal is to preserve a more period-style tire presentation.

Construction matters because it affects both appearance and how the car is set up. A buyer moving away from 640-15 should not treat every radial option as automatically interchangeable just because the wheel diameter matches. Wheel width, overall tire dimensions, and available clearance around the fenders and steering should all be reviewed before making the change.

Radial equivalents for 640-15 include 175R15, P175/75R15, and P185/70R15. The 175R15 is an 80-series metric radial equivalent, P175/75R15 is a 75-series P-metric radial equivalent, and P185/70R15 is a 70-series P-metric radial equivalent. These sizes provide several radial-format alternatives to the original bias-ply code.

Each equivalent follows a different sizing convention, so the choice is not just about construction. The recommended rim-width range attached to these equivalents is 5 to 6 inches, which makes wheel-width verification especially important. It is also wise to compare the actual wheel setup and check body, suspension, and steering clearance before converting from the original 640-15 format.

Start by confirming the car still has 15-inch wheels and then measure the actual wheel width. For a 640-15 conversion, the radial-equivalent options are 175R15, P175/75R15, and P185/70R15, with a recommended rim-width range of 5 to 6 inches attached to those equivalents. That makes wheel compatibility one of the most important first checks.

The next step is to inspect how much room the car has around the fenders, steering, and suspension at full lock and through normal movement. A Daimler that has replacement wheels, altered ride height, or worn suspension bushings can react differently than a stock example. Matching the tire size code alone is not enough when changing both construction and sizing format.

Begin with the main fitment decision: 640-15 bias-ply or 185R15 radial. From there, compare the tire’s construction, sidewall style, tire series, and rim-width suitability for the actual wheels on the car. The Daimler’s available choices range from traditional bias-ply whitewalls and blackwalls to radial blackwall, narrow whitewall, and redline options.

The right selection depends on how the car will be used and how it should look. A restoration-oriented owner may lean toward the visual character of a bias-ply tire, while a driver-focused owner may prefer the radial route. It also helps to compare product details such as weight and load figures where shown, especially if the car sees regular road miles.

The 1964 Daimler 2.5 Litre has a broad range of sidewall treatments depending on size and construction. Available styles include blackwall, narrow whitewall, wide whitewall, and redline. That variety appears across both the 640-15 bias-ply offerings and the 185R15 radial offerings, giving the buyer several distinct visual directions for the car.

Sidewall style can change the Daimler’s overall presentation as much as the tire construction itself. A wide whitewall creates a distinctly vintage look, while blackwall usually feels more restrained and understated. Redline adds a sportier period-style accent. Since appearance is highly personal on a collector sedan, it makes sense to choose the sidewall treatment after the correct size and wheel compatibility are settled.

Brand choices for the 1964 Daimler 2.5 Litre include Coker Classic, Michelin, Avon, Universal Vintage Tire, BFGoodrich, Firestone, and Excelsior. The radial 185R15 selections include Coker Classic, Michelin, Avon, and Universal Vintage Tire, while the 640-15 bias-ply range includes BFGoodrich, Firestone, Avon, and Excelsior.

Brand selection should be considered alongside the actual tire series, sidewall style, and construction type rather than as a standalone decision. A buyer may find that the preferred look is available only in certain series or only in bias-ply or radial form. Once the correct size path is chosen, compare each option against the car’s wheel setup and intended use.

For a period-style 1964 Daimler 2.5 Litre, the 640-15 bias-ply size is the traditional starting point. It keeps the car in a vintage numeric sizing format and is available in blackwall, narrow whitewall, and wide whitewall presentations depending on the specific tire chosen. That makes it a strong fitment path for owners focused on authentic visual character.

Appearance goals still vary from car to car, especially when restorations reflect personal history or regional preferences. If exact originality matters, compare the tire choice against marque references, period photos, or other vehicle-specific documentation rather than relying on size alone. A period-style result comes from matching construction, sidewall treatment, and overall stance as a complete package.

Tire construction changes the visual impression of a restored 1964 Daimler 2.5 Litre in noticeable ways. A 640-15 bias-ply setup gives the car a more traditional vintage presentation, especially when paired with whitewall or blackwall bias-ply styling. A 185R15 radial keeps the 15-inch wheel diameter but shifts the car toward a more modernized classic-touring look.

That difference matters because the Daimler’s body style rewards subtle visual balance. Sidewall treatment, tread character, and the overall tire profile all contribute to whether the car looks more preservation-minded or more road-oriented. Buyers trying to preserve an earlier appearance usually start with construction first, then refine the look by choosing blackwall, redline, or whitewall treatment.

Yes, modifications can affect tire fitment on a 1964 Daimler 2.5 Litre even when the tire size itself seems correct. Replacement wheels, different wheel widths, altered offset, suspension work, or changes in ride height can all influence how a 640-15 or 185R15 tire sits in the wheel opening and clears nearby components.

That is why a modified car should be checked as an individual vehicle rather than treated as a standard reference example. Measure wheel diameter and width, inspect steering and fender clearance, and look for signs of rubbing through the full range of movement. Those checks become especially important when changing from bias-ply construction to a radial setup or vice versa.

Before driving a 1964 Daimler 2.5 Litre on new tires, inspect the wheels for the correct 15-inch diameter, confirm the wheel width suits the chosen tire, and make sure the tires are properly mounted and inflated. It is also smart to look over valve stems, balance, and basic clearance around the fenders, steering, and suspension.

A short collector-car shakedown should include checking for vibration, pull, rubbing, and any unusual contact marks after the first few miles. Older cars can reveal alignment or suspension issues once fresh tires are installed. Sidewall condition, air retention, and even fit at full steering lock are worth reviewing before taking the Daimler on a longer road outing.

Tires on a collector 1964 Daimler 2.5 Litre should be inspected regularly for cracking, bulges, cuts, uneven wear, and slow air loss, even if the car is driven sparingly. Collector vehicles often age their tires through time and storage conditions as much as through mileage, so visual condition matters just as much as remaining tread depth.

Proper storage helps preserve whichever setup the car uses, whether 640-15 bias-ply or 185R15 radial. Keep the Daimler away from prolonged sunlight, excess heat, moisture, and ozone-producing equipment when possible. Regular pressure checks, occasional movement to avoid long static loading, and a close inspection before each driving season all help the tires stay roadworthy.