1951 Bentley Mark Tires

A 1951 Bentley Mark uses two primary tire sizes: 650-16 in a bias-ply construction and 185R16 in a radial construction. Both sizes are associated with the covered Mark VI fitment and both use a 16-inch rim, so the main difference is tire type and sizing format rather than wheel diameter.

The practical choice is deciding whether the car should stay with a traditional 650-16 bias-ply presentation or move to the 185R16 radial size. That decision should be made after checking the actual wheels on the car, especially if it has been restored, re-wheeled, or driven regularly in modern traffic.

The 1951 Bentley Mark uses a 16-inch rim with both of its primary tire sizes. The 185R16 radial and the 650-16 bias-ply both share that same rim diameter, which keeps the first fitment check simple even though the tire constructions differ.

Rim diameter is only part of the decision, because wheel width still matters when comparing specific products. Some 185R16 radials call for wider rim ranges than the common 650-16 bias-ply offerings, so it is smart to confirm the actual wheel width before committing to a tire, especially when converting from one construction type to the other.

650-16 is a vintage numeric bias-ply size. The 6.50 refers to the nominal section width in inches, and the 16 refers to the wheel diameter in inches. On a 1951 Bentley Mark, it represents the traditional bias-ply fitment and is the size most closely associated with a period-style tire presentation.

That older sizing format does not read like a modern metric radial, so it helps to think of it as a width-and-rim-size designation rather than a full modern dimensional code. Once the size is confirmed, the real choices become blackwall or wide whitewall appearance, brand and series preference, and whether the car should remain on bias-ply construction.

For the 1951 Bentley Mark, 650-16 is a bias-ply tire size. It uses the vintage numeric sizing system and appears in classic bias-ply offerings across blackwall and wide whitewall styles, making it the more traditional-looking of the two primary fitments used on this car.

That matters because a bias-ply tire affects both appearance and driving feel compared with a radial. Owners choosing 650-16 usually focus on preserving a period-style look, while those considering a construction change should verify wheel width, overall dimensions, and clearance rather than assuming any radial setup will behave the same on the car.

Both approaches exist for the 1951 Bentley Mark. The 650-16 size keeps the car in a traditional bias-ply format, while 185R16 provides a radial option on the same 16-inch rim diameter. The right choice depends on whether the priority is restoration-minded appearance or a radial setup for regular road driving.

A buyer comparing the two should look beyond the size label and confirm the actual wheel width, the tire's rim-width requirements, and how the car is intended to be used. A carefully restored show car may favor the bias-ply route, while a touring-oriented car may lead an owner toward the radial choice after fitment checks.

Start by confirming that the Bentley is actually equipped with wheels suitable for the radial size being considered. On this car, 185R16 is the radial primary fitment, and its product options include rim-width requirements such as 4.50 to 6.00 inches and 5.0 to 6.5 inches, depending on the tire.

After wheel width is verified, compare the full vehicle setup for steering clearance, fender clearance, and general suspension condition. A conversion from 650-16 bias-ply to 185R16 radial should also account for the car's intended use, since the goal is not just mounting a tire, but choosing a setup that suits the Bentley's wheel and road-use requirements.

Choosing a 650-16 tire for a 1951 Bentley Mark starts with deciding what kind of period-style presentation the car should have. This size is offered in both blackwall and wide whitewall forms, with classic bias-ply series from brands including BFGoodrich, Coker Classic, Firestone, Garfield, Lester, Goodyear, STA, and Tornel.

The next step is matching the tire to the car's wheels and intended use. Some 650-16 products list rim-width guidance around 4.50 to 5.00 inches, while a few differ, and some versions lean toward passenger-car appearance while others use truck or military-style tread patterns that may not suit a restoration-focused Bentley.

1951 Bentley Mark tires are available in two main sidewall styles: blackwall and wide whitewall. The 185R16 radial options shown here are blackwall only, while the 650-16 bias-ply selection includes both blackwall and wide whitewall versions across several classic brands and tire series.

That makes sidewall style an important appearance decision, especially on a postwar luxury car where tire presentation changes the look of the whole vehicle. Blackwalls usually give a more restrained touring appearance, while wide whitewalls create a stronger period statement, so the better choice depends on how the Bentley is being restored or presented.

The 1951 Bentley Mark has tire choices from several brands. In 185R16 radial, available brands include Michelin, Avon, and Vredestein. In 650-16 bias-ply, the range expands to BFGoodrich, Coker Classic, Firestone, Garfield, Excelsior, Lester, Goodyear, STA, and Tornel.

Brand matters mainly because it often tracks with tire series, sidewall treatment, and intended character rather than one simple quality ranking. A buyer should first settle on the correct size and construction, then compare the available brand offerings by appearance, rim-width compatibility, and whether the car is being kept period-style or driven more regularly on radial tires.

For a period-style 1951 Bentley Mark, the 650-16 bias-ply size is the natural starting point because it keeps the car in a vintage construction and offers the broadest range of traditional-looking options. That includes blackwall and wide whitewall versions across several classic bias-ply series and brands.

The right final choice depends on how formal or restrained the restoration should look. A blackwall tire gives a more understated presentation, while a wide whitewall creates a stronger postwar visual statement. When exact historical authenticity matters, it is wise to compare those choices against marque references or restoration records specific to the individual car.

Tire construction changes more than ride and handling on a restored 1951 Bentley Mark; it also changes the visual character of the car. A 650-16 bias-ply tire generally supports a more traditional profile and vintage presentation, while the 185R16 radial gives the car a later-style tire look even though the rim diameter remains 16 inches.

That difference becomes especially noticeable when comparing blackwall radial options against wide whitewall bias-ply choices. Owners aiming for a restoration-minded appearance often choose construction and sidewall style together rather than separately, since the tire's shape, sidewall treatment, and overall stance all contribute to how convincingly the Bentley reads as a period car.

Yes, modifications can affect tire fitment on a 1951 Bentley Mark even when the nominal size looks correct. Changes such as aftermarket wheels, altered wheel width, suspension work, brake conversions, or body repairs can all influence whether a 650-16 bias-ply or 185R16 radial has the clearance and support it needs.

That is why the tire should be matched to the car as it sits today, not just to a catalog-era description. A Bentley that has been restored or updated may need its wheel width, steering clearance, and fender space checked carefully before a tire is chosen, especially when moving between bias-ply and radial construction.

Before driving a 1951 Bentley Mark on new tires, inspect the wheels for correct diameter and condition, confirm the tire is seated properly, and check inflation pressure against the tire's requirements. It is also worth looking over suspension and steering components so the tire is not asked to compensate for worn mechanical parts.

A short initial road test should be paired with a follow-up inspection for rubbing, unusual wear, or air loss. On a collector Bentley, extra attention should go to sidewall clearance, valve condition, and whether the car tracks evenly, since a newly mounted tire can reveal wheel or chassis issues that were less noticeable before.

Collector-car tires on a 1951 Bentley Mark should be maintained with regular pressure checks, periodic visual inspection, and careful storage practices. Whether the car uses 650-16 bias-ply tires or 185R16 radials, low annual mileage does not prevent aging, flat spotting, sidewall cracking, or slow air loss from becoming a problem.

The car benefits from being stored away from prolonged sunlight, heat, moisture, and ozone sources, and the tires should be inspected before any serious road use. Occasional rotation in place and routine movement can help on cars that sit for long periods, while any sign of bulges, cuts, or persistent pressure loss deserves immediate attention.