By 1999, the Bentley Continental represented the marque’s grand touring formula at its most imposing, blending hand-built luxury with the kind of road presence that set these cars apart from ordinary late-1990s coupes. The Continental R, SC, and T all carry that distinctive mix of size, speed, and craftsmanship, but tire fitment is not identical across the range. This 1999 Bentley Continental uses radial tires in three sizes: 255/50R18, 255/55R17, and 285/45R18, depending on the sub-model and wheel setup. The real choice is less about vintage bias-ply versus radial construction and more about confirming the exact sub-model, rim diameter, and tire proportions before selecting a road-ready replacement.
Which Tire Size Is Right for The 1999 Bentley Continental
Three tire sizes apply to the 1999 Bentley Continental, and the correct one depends on the exact sub-model and wheel diameter. The Continental R uses either 255/50R18 or 255/55R17, while the Continental SC and Continental T use 285/45R18. Before choosing a tire, confirm whether the car has 17-inch or 18-inch wheels and match the size to the specific Continental variant rather than assuming all 1999 models share the same fitment.
255/50R18 is a modern metric radial size in which 255 identifies nominal section width in millimeters, 50 is the aspect ratio, R denotes radial construction, and 18 is the wheel diameter in inches. On the 1999 Bentley Continental, this size is used on certain Continental R applications and reflects the car’s later-era performance touring character rather than an earlier vintage sizing system. Its overall profile should be evaluated alongside the vehicle’s exact wheel setup. This is the right size to consider when an 18-inch Continental R wheel is already on the car and the goal is to keep the correct fitment type.
255/55R17 is also a modern metric radial size, with the same 255-millimeter nominal width as 255/50R18 but a 55-series aspect ratio on a 17-inch wheel. This size appears on certain 1999 Bentley Continental R configurations, making wheel diameter confirmation especially important before replacing tires. Even though its overall diameter is close to the 18-inch alternative, it is tied to a different rim size and should not be treated as interchangeable without checking the actual wheels on the car. It suits Continental R cars that retain a 17-inch setup and need a fitment matched to that wheel diameter.
285/45R18 is a wider modern metric radial size, with 285 indicating nominal section width in millimeters, 45 as the aspect ratio, and 18 as the wheel diameter. On the 1999 Bentley Continental, this size is used by the Continental SC and Continental T, where the broader section supports the model-specific fitment these cars require. Its dimensions should be matched carefully to the existing wheel and vehicle setup rather than compared only by rim diameter. This is the size to focus on when selecting tires for an SC or T and preserving the intended proportions of those variants.
Sub-model fitment matters on the 1999 Bentley Continental because the range does not share one universal tire size. The first step is identifying whether the car is a Continental R, Continental SC, or Continental T, then confirming whether it rides on 17-inch or 18-inch wheels.
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1999 Bentley Continental R
The 1999 Bentley Continental R uses either 255/50R18 or 255/55R17, both in radial construction, so wheel diameter has to be confirmed before ordering tires. That means the correct choice depends on the actual wheel set on the car, not simply the model name on the trunk.
The 1999 Bentley Continental SC uses the 285/45R18 radial size. Tire selection for the SC centers on matching that wider 18-inch fitment and verifying that the car still carries its intended wheel setup if it has changed hands or been modified.
The 1999 Bentley Continental T also uses 285/45R18 radial tires. For Continental T owners, the practical goal is choosing a tire in that exact size and confirming wheel condition, wheel diameter, and overall clearance before putting the car back into regular road use.
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 usually need to sort out three things on a 1999 Bentley Continental: the exact tire size for the sub-model, whether the car has 17-inch or 18-inch wheels, and what to inspect before returning a heavy luxury grand tourer to the road.
Tire Size & Fitment
What tire size fits a 1999 Bentley Continental?
A 1999 Bentley Continental can use 255/50R18, 255/55R17, or 285/45R18, depending on the sub-model. The Continental R uses either 255/50R18 or 255/55R17, while the Continental SC and Continental T use 285/45R18. All of these are radial tire sizes.
The key is matching the tire to the exact version of the car and the wheels currently installed. A Continental R owner should confirm whether the car has 17-inch or 18-inch rims, while SC and T owners should verify the 18-inch setup and check wheel width, clearance, and overall condition before replacement.
What size rim does a 1999 Bentley Continental use?
The 1999 Bentley Continental uses either a 17-inch or 18-inch rim, depending on the tire size and sub-model. The 255/55R17 size fits a 17-inch rim, while both 255/50R18 and 285/45R18 fit 18-inch rims. Rim diameter is built into the last number of the tire size.
That makes wheel confirmation one of the most important steps before purchasing tires. A Bentley that has been changed to a different wheel set over time may not match the size expected from the model name alone, so measuring the wheel and checking the current tire markings helps prevent a costly mismatch.
Do all 1999 Bentley Continental sub-models use the same tire size?
No, the 1999 Bentley Continental sub-models do not all use the same tire size. The Continental R uses either 255/50R18 or 255/55R17, while the Continental SC and Continental T use 285/45R18. The fitment differences are tied to the specific Continental variant and wheel setup.
That means tire selection should begin with sub-model identification, then move to wheel-diameter confirmation. Two cars from the same year can require different tires even though they share the Continental name, and the wider 285/45R18 fitment used on SC and T models should not be assumed for every 1999 Bentley Continental.
Choosing the Right Tire
What should I consider when choosing a 1999 Bentley Continental tire?
Start with the exact tire size required by the sub-model and wheel diameter. A 1999 Bentley Continental R may need either 255/50R18 or 255/55R17, while the Continental SC and Continental T use 285/45R18. All are radial sizes, so the main concern is matching the tire to the car’s actual wheel and body setup.
After size is confirmed, compare tire dimensions, wheel compatibility, and the condition of the suspension and steering components. On a large, heavy grand touring Bentley, even a seemingly small fitment mistake can affect clearance and overall drivability, so checking the current wheels and tire markings is worth doing before choosing replacements.
How do I choose between the available 255/50R18 and 255/55R17 tires for a 1999 Bentley Continental?
The choice between 255/50R18 and 255/55R17 applies to the 1999 Bentley Continental R and depends first on wheel diameter. A 17-inch wheel requires 255/55R17, while an 18-inch wheel requires 255/50R18. These sizes are close in overall diameter, but they are built for different rims.
That makes the wheel itself the deciding factor, not personal preference alone. Before replacing tires, verify the wheel diameter stamped on the rim or printed on the current tire, then inspect wheel width and clearance so the selected size matches the car as it sits rather than how it may have left the factory years ago.
How do I choose the right 285/45R18 tire for a 1999 Bentley Continental SC or T?
For a 1999 Bentley Continental SC or Continental T, the correct starting point is 285/45R18. This is the model-specific radial fitment used by those sub-models, so the first requirement is staying with that exact size unless a wheel or suspension change has already altered the car’s setup.
Once the size is confirmed, evaluate the wheels for condition and proper dimensions, then inspect for any clearance issues at the fenders and steering components. Because the 285 width is broader than the Continental R fitments, a careful check of the car’s actual wheel and body configuration is especially important before putting new tires into service.
Restoration & Appearance
Which tire should I choose for a period-style 1999 Bentley Continental?
A period-style approach starts with using the exact size tied to the specific 1999 Bentley Continental sub-model. That means 255/50R18 or 255/55R17 for a Continental R, and 285/45R18 for a Continental SC or Continental T. Since these are modern radial sizes, the emphasis is on preserving the car’s intended proportions and stance.
Appearance on a late-1990s Bentley depends heavily on getting the size and wheel diameter right rather than chasing an earlier vintage tire style. Owners pursuing a highly exact restoration standard should also compare the car against marque literature, photos, and historical records so the wheel-and-tire presentation matches the car’s original character.
Does correct tire fitment matter for a 1999 Bentley Continental restoration?
Yes, correct tire fitment matters on a 1999 Bentley Continental restoration because the tire size shapes both the car’s stance and how it sits on the wheel. Using the proper 255/50R18, 255/55R17, or 285/45R18 fitment for the correct sub-model helps maintain the visual balance intended for the Continental range.
Fitment also affects the restoration beyond appearance. Incorrect wheel diameter or an unsuitable tire profile can create clearance issues and make the finished car look out of proportion, so restorers should confirm the actual sub-model, current wheels, and tire markings before choosing replacements for a cosmetic refresh or a full mechanical recommissioning.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1999 Bentley Continental?
Yes, modifications can affect tire fitment on a 1999 Bentley Continental. Aftermarket wheels, altered suspension height, brake upgrades, or body changes can all change the space available for a 255/50R18, 255/55R17, or 285/45R18 tire. Even when the size matches the model, the car itself may no longer be in standard configuration.
That is why it helps to inspect the actual wheel diameter and width, then check steering lock, fender clearance, and suspension travel before mounting replacement tires. On a collector luxury coupe that may have changed owners several times, visual confirmation is often more reliable than relying on assumptions about what should be on the car.
What should I inspect before driving a 1999 Bentley Continental on new tires?
Before driving a 1999 Bentley Continental on new tires, inspect the wheels for damage, verify that the tire size matches the sub-model, and check inflation, valve stems, and overall mounting quality. It also makes sense to look at the suspension, steering components, and alignment condition on a heavy grand touring car like this.
A road test should begin gently so any vibration, rubbing, or pull can be caught early. Collector cars that sit for long periods deserve extra attention to brake condition, fluid leaks, and tire age on any remaining spare, because a fresh set of tires works best when the rest of the chassis is equally ready for road use.
What should I check before a longer drive in a 1999 Bentley Continental?
Before a longer drive, make sure the 1999 Bentley Continental has the correct tire size for its sub-model, proper inflation, and no visible cracking, bulges, cuts, or abnormal wear. Wheel fasteners, tread condition, and signs of air loss also deserve attention, especially on a car that may spend part of its life in storage.
Long-distance confidence comes from checking more than the tread alone. A Bentley Continental should also be evaluated for alignment stability, brake operation, and any rubbing at full steering lock or over suspension movement, since those problems may not appear in the garage but can become obvious once the car is loaded and moving at road speed.
