The 1999 Bentley Azure belongs to the final years of Bentley’s grand open touring tradition before the marque’s modern era fully took shape. Long, powerful, and unmistakably formal, the Azure pairs luxury-car presence with the kind of curb weight and road manners that make tire selection more than a cosmetic decision. On this model, fitment centers on radial construction, with 255/50R18 and 255/55R17 used on the Azure Base and 285/45R18 fitted to the Azure Mulliner. That means the first step is confirming the exact sub-model and wheel diameter. From there, the priority shifts to preserving proper proportions, load-carrying confidence, and clearance on a large luxury convertible.
Which Tire Size Is Right for The 1999 Bentley Azure
The 1999 Bentley Azure uses three primary tire sizes, and the right one depends on the exact sub-model and wheel diameter. The Azure Base uses either 255/50R18 or 255/55R17, while the Azure Mulliner uses 285/45R18. Before choosing a tire, confirm whether the car is a Base or Mulliner and verify whether it is equipped with 17-inch or 18-inch wheels.
255/50R18 is a metric radial size in which 255 refers to the nominal section width in millimeters, 50 is the aspect ratio, and 18 identifies the wheel diameter in inches. This is a radial tire format suited to the 1999 Bentley Azure’s modern luxury-car fitment requirements and 18-inch wheel setup. Its dimensions place it in the same overall height range as the 255/55R17 alternative used on the Azure Base, but it is intended for a different rim diameter. This size is the right place to start when the car is a Base model already running 18-inch wheels.
255/55R17 is a metric radial size with a 255-millimeter nominal section width, a 55-series aspect ratio, and a 17-inch rim diameter. For the 1999 Bentley Azure, this size appears on the Azure Base and serves owners whose cars retain a 17-inch wheel package rather than the 18-inch alternative. Its overall diameter is closely aligned with the 255/50R18 size, but wheel diameter remains the key fitment difference. Choosing this size starts with confirming that the car still has the correct 17-inch wheels and adequate width for the tire being considered.
285/45R18 is a wider metric radial size where 285 denotes the nominal section width in millimeters, 45 is the aspect ratio, and 18 is the wheel diameter in inches. On the 1999 Bentley Azure, this size is associated with the Azure Mulliner and reflects a different fitment approach than the Base model sizes. The larger section width makes wheel compatibility and body clearance especially important on a car that may have seen wheel or suspension changes over time. This is the size to evaluate when the car is a Mulliner with its proper 18-inch wheel setup.
Sub-model fitment matters on the 1999 Bentley Azure because the Base and Mulliner do not use the same tire setup. Confirming the exact sub-model and wheel diameter is the quickest way to narrow the correct tire size before comparing individual tire choices.
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1999 Bentley Azure Base
The 1999 Bentley Azure Base uses two radial tire fitments, depending on whether the car is equipped with 17-inch or 18-inch wheels. Tire selection starts with confirming the wheel diameter on the car, then matching the tire size to the existing setup rather than assuming every Azure Base uses the same wheel package.
The 1999 Bentley Azure Mulliner uses a 285/45R18 radial tire, giving it a distinct fitment from the Base model. That makes sub-model confirmation important, especially on cars that may have changed hands or received wheel changes, because the wider 18-inch setup should be matched carefully to the wheel and body clearance.
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.
Frequently Asked Questions
Owners of a 1999 Bentley Azure usually need to sort out exact tire size, rim diameter, and sub-model before anything else. These FAQs focus on Base versus Mulliner fitment, metric radial sizing, appearance considerations, and the wheel and suspension checks worth making before road use.
Tire Size & Fitment
What tire size fits a 1999 Bentley Azure?
The 1999 Bentley Azure uses three primary tire sizes: 255/50R18, 255/55R17, and 285/45R18. The Azure Base uses either 255/50R18 or 255/55R17, while the Azure Mulliner uses 285/45R18. All of these are radial tire fitments.
The practical step is confirming the exact sub-model and wheel diameter before choosing a tire. A Base model can be fitted with either a 17-inch or 18-inch wheel setup, while the Mulliner uses a different 18-inch size. Matching the tire to the existing wheel is more important than assuming one size applies across every 1999 Azure.
What size rim does a 1999 Bentley Azure use?
A 1999 Bentley Azure uses either a 17-inch or 18-inch rim, depending on the tire size and sub-model. The 255/55R17 size is used on a 17-inch wheel, while both 255/50R18 and 285/45R18 are used on 18-inch wheels.
Wheel diameter should be checked directly on the car before ordering tires, especially on a luxury convertible that may have had replacement wheels installed over time. The Azure Base can use more than one rim diameter, so the correct answer depends on the actual wheel package in place. Width and clearance also deserve attention once diameter is confirmed.
Do all 1999 Bentley Azure sub-models use the same tire size?
No. The 1999 Bentley Azure Base and 1999 Bentley Azure Mulliner do not share the same tire fitment. The Base uses either 255/50R18 or 255/55R17, while the Mulliner uses 285/45R18.
That difference means the sub-model name matters just as much as the model name when selecting tires for this Bentley. It is also wise to confirm the wheel diameter and the actual tire currently mounted, since collector and luxury cars are sometimes changed from their original wheel setups. Starting with the exact sub-model helps avoid comparing the wrong size entirely.
Choosing the Right Tire
What should I consider when choosing a 255/50R18 tire for a 1999 Bentley Azure?
For a 1999 Bentley Azure using 255/50R18, the first priorities are matching the 18-inch wheel diameter and confirming that the car is a Base model equipped for that size. Because this is a modern metric radial fitment, the tire should also suit the vehicle’s weight, proportions, and intended road use.
Selection becomes easier once the basics are confirmed on the car itself. Check the wheel width, inspect clearance at the fender and suspension, and make sure the existing setup has not been altered by aftermarket wheels or ride-height changes. On a large grand touring convertible, proper fitment matters not only for appearance, but also for stable road manners.
How do I choose between the available 1999 Bentley Azure tire sizes?
Choosing between 255/50R18, 255/55R17, and 285/45R18 is not a matter of preference alone, because each size belongs to a specific 1999 Bentley Azure configuration. The Azure Base uses either 255/50R18 or 255/55R17 depending on wheel package, while the Azure Mulliner uses 285/45R18.
The best approach is to identify the sub-model first and then verify the actual wheel diameter on the vehicle. A tire that belongs on an 18-inch wheel cannot be treated as an alternative for a 17-inch wheel just because the overall height is similar. Once the correct size is confirmed, then it makes sense to compare individual tires within that fitment.
What rim-width specifications should I compare when choosing 1999 Bentley Azure tires?
Rim width is an important part of tire selection for a 1999 Bentley Azure because these are wide modern metric radial sizes, especially the 285/45R18 used on the Azure Mulliner. Even when the tire size and wheel diameter are correct, the wheel still needs to be appropriate for the tire’s intended section width.
Compare the tire’s approved wheel fitment to the actual wheels on the car before making a final choice. That step is especially helpful on vehicles that may have had custom or replacement wheels installed. A Bentley of this size and weight benefits from a tire and wheel combination that preserves proper sidewall shape, clearance, and overall stability.
Restoration & Appearance
Which tire should I choose for a period-style 1999 Bentley Azure?
A period-style choice for a 1999 Bentley Azure starts with using the correct primary size for the exact sub-model and wheel package. That means 255/50R18 or 255/55R17 for the Azure Base, and 285/45R18 for the Azure Mulliner, all in radial construction.
Appearance on a late-1990s Bentley is tied closely to maintaining the proper proportions of the wheel and tire package rather than chasing an older bias-ply look. A car wearing the right size generally presents more naturally than one fitted with an approximate substitute. Owners pursuing a highly accurate restoration should also compare against marque-specific photos, records, and surviving original examples.
Does correct tire fitment matter for a 1999 Bentley Azure restoration?
Yes, correct tire fitment matters on a 1999 Bentley Azure restoration because the car’s stance, wheel-to-body relationship, and road presence depend heavily on the proper size. Using the right radial fitment for the Base or Mulliner helps preserve the character of the car far better than treating all Azures the same.
A restoration-minded owner should pay attention to both sub-model and wheel diameter before comparing individual tires. The Azure Base’s two size paths make that especially important. Beyond visual accuracy, proper fitment helps avoid clearance problems and supports the composed touring feel expected from a large Bentley convertible intended for real road use.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1999 Bentley Azure?
Yes, modifications can affect tire fitment on a 1999 Bentley Azure. Aftermarket wheels, changes in wheel offset, suspension alterations, or body modifications can all change how a 255/50R18, 255/55R17, or 285/45R18 tire sits within the wheel opening and around steering or suspension components.
That is especially important on an Azure because the model already uses more than one wheel diameter and more than one tire width across its sub-models. Before replacing tires, inspect the actual wheel setup on the car and look closely at clearance at full steering lock and through suspension travel. A modified car should never be sized by model name alone.
What should I inspect before driving a 1999 Bentley Azure on new tires?
Before driving a 1999 Bentley Azure on new tires, inspect wheel condition, confirm the tire size matches the sub-model and rim diameter, and check that inflation is set appropriately for the tire being used. It is also wise to look for any signs of rubbing, uneven suspension height, or alignment issues.
A careful walkaround matters on a heavy luxury convertible that may spend periods in storage. Look for sidewall contact, verify lug hardware is correct for the wheels, and recheck pressure after the tires have seated and the car has been driven briefly. Smooth steering response and even clearance from side to side are good signs that the setup is behaving properly.
What should I check before a longer drive in a 1999 Bentley Azure?
Before a longer drive in a 1999 Bentley Azure, check tire pressure, tread condition, sidewalls, and any signs of air loss or age-related cracking. Confirm that the tires on the car are the correct size for the specific Base or Mulliner setup and that the wheels are free of visible damage.
Longer trips put more heat and load into the tires, so it helps to catch issues before the car is on the road for extended periods. A collector Bentley that is driven infrequently also benefits from a close inspection for flat-spotting, bulges, or storage-related deterioration. Paying attention to these basics helps preserve both safety and the composed touring character the Azure is known for.
