The 1955 Bentley S-Type sits at the start of Bentley's postwar S-Series, carrying the restrained formal style and long-distance touring character expected of a large British luxury saloon of the period. Tire choice on a car like this affects more than ride quality; it also shapes stance, steering feel, and the visual balance of the whole car. The primary fitment is an 820-15 bias-ply tire on a 15-inch rim. Within that size, there are blackwall, narrow whitewall, and wide whitewall choices, along with several classic tire series and modern radial equivalents. The right decision depends on whether the goal is restoration-oriented appearance, road use, or a careful blend of both.
Which Tire Size Is Right for The 1955 Bentley S-Type
The 1955 Bentley S-Type uses one primary tire size: 820-15. It is a bias-ply fitment on a 15-inch rim, and the same size carries across the covered S-Type Base configuration. That means the main decision is not sorting between multiple factory-type sizes, but choosing the right presentation within 820-15 and deciding whether to stay with bias-ply construction or evaluate one of the available radial equivalents.
An 820-15 is a vintage numeric bias-ply size in which the 8.20 designation refers to the tire's nominal section width in inches, and the 15 identifies the wheel diameter. For a 1955 Bentley S-Type, that format matches the period bias-ply construction that suits the car's original era and traditional road-going character. Available choices in this size include blackwall, narrow whitewall, and wide whitewall treatments from brands such as BFGoodrich, Firestone, US Royal, Universal Vintage Tire, and Avon across several classic series. It is the size to evaluate when preserving the car's vintage profile, while still comparing sidewall style, rim-width compatibility, and intended use.
Sub-model fitment is straightforward for the 1955 Bentley S-Type. The covered S-Type Base configuration uses the same primary tire size, so the key decision stays focused on construction choice, sidewall appearance, and how the car will be driven.
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1955 Bentley S-Type Base
The 1955 Bentley S-Type Base uses the same 820-15 bias-ply tire size on a 15-inch rim. That keeps selection centered on period-style blackwall or whitewall presentation, brand and series differences, or whether a radial equivalent is worth considering for the wheel and vehicle setup.
Bias-Ply to Radial Tire Conversion for the 1955 Bentley S-Type
The original 820-15 size has four radial-equivalent options. Those include 235R15 as an 80-series metric radial, P235/75R15 as a 75-series P-metric radial, P255/70R15 as a 70-series P-metric radial, and 820R15 as a bias-look radial equivalent. Together, they span traditional metric sizing, lower-profile P-metric alternatives, and a radial option that keeps a more vintage visual character. A 6-8 inch rim-width range is associated with these equivalents, and wheel compatibility, overall dimensions, and clearance should be checked before changing construction.
Modern Radial Equivalents
235R15
Equivalent 80-series Metric Radial (820-15)
P235/75R15
Equivalent P-metric 75-series Radial (820-15)
P255/70R15
Equivalent P-metric 70-series Radial (820-15)
820R15
Bias-look Radial Equivalent (820-15)
Important Considerations When Replacing Bias Ply With Radial
Compare overall diameter and section width carefully to ensure proper fit.
Verify recommended rim range (6-8 in) and load needs match your vehicle specifications.
Check fender clearance, steering clearance, and stance before installation.
Consider suspension condition and intended road use when choosing equivalents.
Important Fitment Notes
The tire sizes listed on this page assume factory-standard vehicle configuration. The following modifications may affect tire fitment and are not reflected in this guide:
Suspension changes (lowering, lift kits, spring replacements)
Body alterations (fender modifications, custom bodywork)
If your vehicle has been modified from factory specifications, verify tire clearance before purchase.
Best 1955 Bentley S-Type Tires for Sale
Available 820-15 choices for the 1955 Bentley S-Type include BFGoodrich, Firestone, US Royal, Universal Vintage Tire, and Avon offerings. The product grid gives the buyer meaningful comparisons across classic series, blackwall and whitewall presentations, bias-ply construction, and rim-width specifications.
These 1955 Bentley S-Type tire FAQs focus on the 820-15 fitment, 15-inch rim compatibility, bias-ply versus radial-equivalent choices, sidewall appearance, and the checks that matter before putting a collector Bentley back on the road.
Tire Size & Fitment
What tire size fits a 1955 Bentley S-Type?
The 1955 Bentley S-Type uses an 820-15 tire size. That is a vintage numeric bias-ply fitment used on a 15-inch rim, and it is the primary size for the covered S-Type Base configuration as well.
Because there is one primary size, the real choice is not between multiple fitments but between the available 820-15 tire styles and constructions. Buyers should still confirm the actual wheel setup on the car, especially if it has been modified, and compare sidewall treatment, rim-width suitability, and whether a radial equivalent is being considered.
What size rim does a 1955 Bentley S-Type use?
The 1955 Bentley S-Type uses a 15-inch rim with its primary 820-15 tire fitment. That rim diameter is consistent with the covered fitment for the S-Type Base model.
Rim diameter is only one part of the fitment picture, so the wheel should also be checked for width and condition before new tires are installed. That becomes especially important when comparing different 820-15 products or moving to a radial equivalent, since wheel compatibility and vehicle clearance still need to be verified.
Does the 1955 Bentley S-Type Base use the same tire size?
Yes. The 1955 Bentley S-Type Base uses the same 820-15 bias-ply tire size as the core fitment for this model. There is no separate primary tire size to sort through for that covered sub-model.
That simplifies the fitment decision and lets the buyer focus on how the tire should look and how the car will be used. For a restoration-oriented Bentley, that may mean comparing blackwall, narrow whitewall, and wide whitewall options, while road-use planning may lead to a closer look at radial-equivalent alternatives.
Bias-Ply & Radial Options
Is 820-15 a bias-ply or radial tire for the 1955 Bentley S-Type?
For the 1955 Bentley S-Type, 820-15 is a bias-ply tire size. That construction matches the primary fitment and keeps the car in the traditional vintage sizing system associated with period-style replacement tires.
Staying with bias-ply construction usually appeals to owners who want the original-era look and a more traditional presentation. A move to radial construction is a separate decision and should be treated as an alternative setup, with attention paid to wheel width, overall tire dimensions, and clearance at the fenders and steering components.
What radial tire sizes are equivalent to 820-15?
Radial equivalents for 820-15 include 235R15, P235/75R15, P255/70R15, and 820R15. Those cover an 80-series metric radial, a 75-series P-metric radial, a 70-series P-metric radial, and a bias-look radial equivalent.
Each option gives the 1955 Bentley S-Type owner a different sizing format and profile approach while staying in the range of recognized alternatives to 820-15. A 6-8 inch rim-width range is associated with these equivalents, but wheel compatibility, actual tire dimensions, and body or suspension clearance still need to be checked before converting.
Can I use a bias-look radial on a 1955 Bentley S-Type?
A bias-look radial equivalent is available for the 1955 Bentley S-Type in size 820R15. It is a radial alternative intended to preserve more of the traditional visual character associated with the original 820-15 fitment.
That can make it appealing to owners who want a vintage-looking tire without staying strictly with bias-ply construction. Even so, it should be approached as an equivalent rather than an automatic replacement, and the wheel dimensions, tire clearance, and overall setup of the car should be confirmed before making the change.
Choosing the Right Tire
What should I consider when choosing a 820-15 tire for a 1955 Bentley S-Type?
Start with the correct 820-15 size and the type of presentation the car needs. On a 1955 Bentley S-Type, the main selection factors are whether to stay with bias-ply construction, which sidewall style suits the car, and which tire series best matches the intended use and appearance.
Comparing the wheel's actual width against the tire's rim-width specification is a smart next step, especially on a car that may no longer wear its original wheels. It also helps to consider load capacity figures where stated, the car's road-use plans, and whether a classic blackwall or one of the available whitewall treatments better suits the build.
What sidewall styles are available for 1955 Bentley S-Type tires?
The 1955 Bentley S-Type has 820-15 tire options in blackwall, narrow whitewall, and wide whitewall styles. Those sidewall treatments appear across several of the available classic bias-ply offerings in this fitment.
Sidewall choice has a major effect on how a large luxury car from the mid-1950s presents visually. A blackwall keeps the look restrained, while whitewall options add a stronger period-style statement, so the right choice depends on the car's restoration direction, trim presentation, and whether the owner wants a more understated or more formal vintage appearance.
What brands offer tires for the 1955 Bentley S-Type?
Tires for the 1955 Bentley S-Type in 820-15 are available from BFGoodrich, Firestone, US Royal, Universal Vintage Tire, and Avon. The assortment includes several classic bias-ply series and a range of sidewall treatments within the same primary size.
Brand choice should be considered alongside tire series, sidewall presentation, and the wheel specifications on the car rather than in isolation. For many buyers, the most useful comparison is whether the tire supports the desired look and usage, from a traditional touring presentation to a more specialized application within the same nominal size.
Restoration & Appearance
Which tire should I choose for a period-style 1955 Bentley S-Type?
A period-style 1955 Bentley S-Type starts with the 820-15 bias-ply size. That keeps the car in the correct vintage sizing format and gives access to traditional blackwall, narrow whitewall, and wide whitewall choices that suit a mid-1950s luxury touring car.
The best appearance choice depends on how formal or understated the finished car should look, not simply on size alone. When exact originality matters, period photography, build records, and marque-specific restoration guidance can help narrow the proper sidewall treatment, while the tire itself still needs to match the wheel dimensions and intended driving use.
How does tire construction affect the appearance of a restored 1955 Bentley S-Type?
Tire construction can change the visual impression of a restored 1955 Bentley S-Type even when the overall fitment remains close. A bias-ply 820-15 usually preserves the traditional vintage look more naturally, while a radial alternative can alter the car's presentation depending on the size format and sidewall style chosen.
That matters on a car with formal proportions, where tire profile and sidewall treatment are part of the overall design balance. Owners who want a more traditional look but still want to explore radial construction often focus on a bias-look radial, then confirm that the wheel, stance, and body clearance remain appropriate.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1955 Bentley S-Type?
Yes. Modifications can affect tire fitment on a 1955 Bentley S-Type even when the intended tire size remains 820-15. Changes to wheel width, wheel offset, suspension height, steering components, or body clearance can all influence how well a tire works on the car.
That is especially important when the Bentley has aftermarket wheels or when a radial equivalent is being considered instead of the original-type bias-ply construction. A careful check of wheel dimensions, suspension travel, and clearance at full steering lock helps prevent surprises once the new tires are mounted and the car returns to road use.
What should I inspect before driving a 1955 Bentley S-Type on new tires?
Before driving a 1955 Bentley S-Type on new tires, inspect the wheels for correct diameter, width, and general condition, then confirm that the tires are properly seated and inflated. It also makes sense to look over suspension, steering, and brake components on a collector car that may have spent long periods parked.
A short initial road test can reveal rubbing, vibration, pulling, or other signs that the setup needs attention. After that first drive, recheck inflation, look for any marks that suggest clearance issues, and keep an eye on how the car tracks and rides as the new tires begin normal service.
How should 820-15 tires on a collector 1955 Bentley S-Type be maintained?
820-15 tires on a collector 1955 Bentley S-Type should be maintained with regular pressure checks, routine visual inspections, and close attention to age-related condition. Sidewall cracking, bulges, cuts, uneven wear, and unexplained air loss all deserve prompt attention, especially on a car that is driven only occasionally.
Storage matters almost as much as mileage on a collector Bentley. Keeping the car away from prolonged sunlight, moisture, heat, and ozone sources helps protect the tires, while periodic movement can reduce flat spotting during long idle periods. Any tire that shows questionable condition should be evaluated before the car returns to the road.