1964 Bentley S3 Tires

The 1964 Bentley S3 uses an 820-15 tire size. That is a numeric bias-ply fitment mounted on a 15-inch rim, and it is the primary original-style size associated with this model. For the covered S3 Base configuration, the fitment stays consistent rather than changing across multiple primary sizes.

That means the first step is not sorting through several factory sizes, but confirming that the car still has the correct 15-inch wheel setup and then choosing the tire style that suits your goals. Sidewall appearance, tire series, and whether to remain with bias-ply construction or consider a radial equivalent become the real decision points.

The 1964 Bentley S3 uses a 15-inch rim with its primary 820-15 tire fitment. Product fitments in this size commonly center around 6.00 to 6.50-inch rim widths, while the radial-equivalent guidance for this size points to a broader 6 to 8-inch range depending on the tire chosen.

Wheel diameter should always be confirmed on the car before selecting tires, especially on a collector Bentley that may have seen wheel changes over the years. Rim width matters as well, since it affects how a tire sits on the wheel and whether a bias-ply or radial-equivalent option is being evaluated appropriately.

On a 1964 Bentley S3, 820-15 is a vintage numeric bias-ply size. The 8.20 portion refers to the tire’s nominal section width in inches, and the 15 identifies the wheel diameter in inches. It is an older sizing system, so it reads differently from modern metric radial sizes such as 235R15 or P235/75R15.

Understanding that format helps separate the original-style fitment from modern radial equivalents. It also keeps the focus on the right comparison points when choosing tires, since the car’s tire decision is less about decoding modern aspect-ratio conventions and more about preserving proper appearance, construction, and wheel compatibility.

For the 1964 Bentley S3, 820-15 is the primary bias-ply tire size. That traditional construction matches the vintage numeric sizing format and supports the tall-sidewall appearance that suits a formal early-1960s Bentley. The available original-style products in this size are bias-ply tires rather than modern radials.

That matters because choosing a tire for this car can involve two different goals. Staying with 820-15 bias-ply keeps the original-style construction and visual character, while moving to a radial-equivalent option changes the construction approach and calls for extra attention to wheel width, tire dimensions, and body or steering clearance.

Radial equivalents for the 1964 Bentley S3’s 820-15 size include 235R15 as an 80-series metric radial, P235/75R15 as a P-metric 75-series radial, P255/70R15 as a P-metric 70-series radial, and 820R15 as a bias-look radial equivalent. These options offer several radial sizing conventions while staying tied to the original 15-inch wheel diameter.

The practical difference is that each equivalent represents a different format and profile family, not an automatic one-size-fits-all substitution. The recommended rim-width range for these equivalents is 6 to 8 inches, and the final choice should be checked against the car’s actual wheel width, overall fit, and available clearance.

A bias-look radial option is available for the 1964 Bentley S3 in the form of 820R15. That size is a radial equivalent intended for owners who want a more traditional visual presentation than a fully modern-looking metric radial while still considering a change in construction from the original 820-15 bias-ply setup.

It can be a useful middle ground when appearance matters, but it should still be treated as a radial alternative rather than the same thing as a bias-ply tire. Wheel width, vehicle stance, and clearance need to be checked just as carefully as they would with any other radial-equivalent conversion.

Start with the correct 820-15 size and 15-inch wheel, then decide what matters most for the car’s intended use and appearance. The available choices span blackwall, narrow whitewall, and wide whitewall styles, along with several classic tire series and multiple brands. Most traditional options in this size are bias-ply constructions.

From there, compare details that affect suitability on the car you actually have, including rim-width compatibility, load figures where shown, and whether the car is being preserved for display, touring, or occasional road use. On a Bentley of this era, sidewall presentation often matters just as much as the construction choice.

The 1964 Bentley S3’s 820-15 tire choices include blackwall, narrow whitewall, and wide whitewall sidewall styles. That gives the car a broad range of visual directions, from a restrained formal blackwall look to a more pronounced whitewall presentation that suits many restoration-oriented luxury-car builds of the period.

The right sidewall style depends on the appearance you want the car to project and how closely you are trying to echo a particular early-1960s presentation. Buyers concerned with strict originality should compare tire appearance against marque-specific historical references, while drivers focused on overall period style can choose the whitewall width that best complements the car.

Tires for the 1964 Bentley S3’s 820-15 size are available from BFGoodrich, Firestone, US Royal, Universal Vintage Tire, and Avon. These brands appear across several classic lines, including Silvertown Classic Bias Ply, Firestone Classic Bias Ply, US Royal Classic Bias Ply, Universal Classic Bias Ply, and Avon’s Turbospeed Mk4.

Brand choice should be evaluated alongside tire series, sidewall style, construction, and wheel compatibility rather than treated as a standalone decision. Since this Bentley uses one primary size, comparing the available products is mainly about the tire’s look, intended character, and whether its specifications suit the wheel and road-use plans for the car.

For a period-style 1964 Bentley S3, the natural starting point is the 820-15 bias-ply size. That keeps the car in its original sizing language and preserves the tall-sidewall, formal touring look that fits a Bentley saloon of this era. From there, the decision usually comes down to blackwall versus whitewall presentation and the preferred classic tire series.

A restoration-oriented buyer should think about how the tire complements the car’s paint, trim, and overall presentation rather than chasing a generic vintage look. If exact historical accuracy matters, compare sidewall width and brand appearance against Bentley-specific references or period photography before making the final selection.

Tire construction changes more than ride feel on a restored 1964 Bentley S3; it also changes the car’s visual character. An 820-15 bias-ply maintains the traditional sidewall profile and vintage sizing presentation associated with the car, while radial equivalents introduce a more modern construction even when they are chosen in a sympathetic size.

That difference becomes especially noticeable on a formal luxury car where wheel opening fill, sidewall shape, and whitewall treatment influence the overall stance. Buyers trying to preserve a traditional restoration look often start with bias-ply, while those considering radials should look closely at how the tire’s profile complements the car from every angle.

Modifications can absolutely affect tire fitment on a 1964 Bentley S3. Even though the primary size is 820-15 on a 15-inch rim, aftermarket wheels, changed rim widths, suspension work, ride-height changes, or body repairs can alter how that tire or a radial equivalent sits in the wheel opening and clears surrounding components.

That is especially important before moving away from the original-style bias-ply setup. A Bentley that has non-stock wheels or altered suspension should be measured carefully for wheel width, steering clearance, and fender room before any tire is selected. Checking the actual car matters more than assuming every surviving example remains unchanged.

Before driving a 1964 Bentley S3 on new tires, inspect the wheels for correct diameter and condition, confirm the tires are mounted and inflated properly, and check for adequate clearance at full steering lock and normal suspension movement. It also makes sense to inspect the valve stems, balance, and general wheel hardware condition.

A collector car that sees limited use deserves a broader walk-around before road use. Look for fluid leaks that could reach the tires, verify that the spare and jack are serviceable, and make sure the steering and suspension feel stable. A short, cautious test drive can reveal rubbing, pull, vibration, or other setup issues early.

820-15 tires on a collector 1964 Bentley S3 should be maintained with regular pressure checks, periodic visual inspections, and close attention to age-related condition. Even low-mileage vintage cars can develop sidewall cracking, flat spotting, bulges, cuts, or slow air loss simply from long periods of inactivity and storage.

Storage conditions matter almost as much as mileage on a car of this type. Keeping the Bentley away from prolonged heat, direct sunlight, moisture, and ozone sources helps protect the tires, and occasional movement can reduce stress from sitting in one position. Any sign of deterioration deserves prompt professional evaluation before road use.