The 2018 Bentley Mulsanne represents the final era of Bentley’s hand-built flagship sedan, blending traditional craftsmanship with modern luxury in a full-size car meant to deliver quiet speed and long-distance composure. For buyers and owners, tire selection is less about vintage-style construction and more about confirming the exact wheel setup on the car. This model uses radial tires in two sizes, 265/45R20 and 265/40R21, with fitment varying by sub-model and wheel diameter. The key decision is whether the car is equipped with 20-inch or 21-inch wheels, then choosing the appropriate tire within that modern metric radial size for proper fitment, appearance, and road manners.
Which Tire Size Is Right for The 2018 Bentley Mulsanne
The 2018 Bentley Mulsanne uses two primary tire sizes, and the first step is confirming whether the car has 20-inch or 21-inch wheels. Both sizes are radial metric fitments, but they are not interchangeable simply because they are close in overall dimensions. The Mulsanne Base can use either size depending on wheel setup, while the Mulsanne Speed uses 265/40R21.
A 265/40R21 tire uses a 265-millimeter section width, a 40-series aspect ratio, radial construction, and fits a 21-inch wheel. On the 2018 Bentley Mulsanne, this is a modern low-profile luxury-performance fitment that places wheel diameter confirmation at the center of the decision. It appears on the Mulsanne Speed and can also be used on the Mulsanne Base when equipped with 21-inch wheels. Buyers considering this size should confirm the actual wheel on the car before comparing tire choices, since the 21-inch fitment changes both appearance and compatibility compared with the 20-inch alternative.
A 265/45R20 tire carries the same 265-millimeter nominal width as the 21-inch option, but with a 45-series aspect ratio on a 20-inch rim. For the 2018 Bentley Mulsanne, this is the other primary radial fitment and is tied to wheel diameter rather than a broad all-model application. Its dimensions are close to the 21-inch size, but the rim diameter is different, so wheel fitment remains the deciding factor. This size is the right one to evaluate when a Mulsanne Base is equipped with 20-inch wheels and the goal is to keep the proper modern luxury-sedan tire format.
Sub-model fitment matters on the 2018 Bentley Mulsanne because tire choice follows the wheel and trim configuration. The Base model can appear with either primary size, while the Speed uses the 21-inch fitment, so identifying the exact version of the car is the starting point.
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2018 Bentley Mulsanne Base
The 2018 Bentley Mulsanne Base can use either 265/45R20 or 265/40R21 radial tires, depending on the wheel setup installed on the car. That makes wheel diameter confirmation especially important before comparing tire options or replacing a full set.
The 2018 Bentley Mulsanne Speed uses the 265/40R21 radial tire size. For this sub-model, the main selection task is choosing the right tire within that 21-inch fitment while confirming that the car still carries its correct wheel configuration.
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
These FAQs focus on the exact tire sizes used on the 2018 Bentley Mulsanne, the difference between its 20-inch and 21-inch wheel fitments, and the practical checks that matter before replacing tires on a modern luxury sedan.
Tire Size & Fitment
What tire size fits a 2018 Bentley Mulsanne?
The 2018 Bentley Mulsanne uses two primary tire sizes: 265/45R20 and 265/40R21. Both are radial metric tire sizes, and the correct one depends on the wheel setup and sub-model. The Mulsanne Base can use either size, while the Mulsanne Speed uses 265/40R21.
Choosing between them starts with the wheel actually on the car, not just the model name. A 20-inch tire does not belong on a 21-inch wheel, and a 21-inch tire does not belong on a 20-inch wheel. Checking the existing sidewall size and verifying wheel diameter before ordering helps prevent a mismatch.
What size rim does a 2018 Bentley Mulsanne use?
A 2018 Bentley Mulsanne uses either a 20-inch or 21-inch rim, depending on the tire size fitted to the car. The 265/45R20 tire fits a 20-inch wheel, and the 265/40R21 tire fits a 21-inch wheel. Both sizes are correct within the proper configuration.
The practical issue is that rim diameter determines which tire size can even be mounted. Before replacing tires, confirm the wheel diameter stamped on the wheel or read the current tire size on the sidewall. That matters especially on a Mulsanne Base, since either rim size may be present.
Do all 2018 Bentley Mulsanne sub-models use the same tire size?
No, not all 2018 Bentley Mulsanne sub-models use the same tire size. The Mulsanne Base can use either 265/45R20 or 265/40R21, while the Mulsanne Speed uses 265/40R21. The difference comes down to configuration and wheel diameter, not a universal single-size fitment across the range.
That means sub-model identification helps, but it is still smart to inspect the car itself before buying tires. A Base model may be on 20-inch or 21-inch wheels, so the mounted size should always be checked. On the Speed, the 21-inch setup is the key fitment to match.
Choosing the Right Tire
What should I consider when choosing a 265/40R21 tire for a 2018 Bentley Mulsanne?
Start with the correct size, since 265/40R21 is the primary 21-inch fitment used on the 2018 Bentley Mulsanne Speed and on some Mulsanne Base configurations. The important basics are matching the wheel diameter, confirming the tire’s overall suitability for a large luxury sedan, and keeping the same size format already on the car.
Selection should also reflect how the car is used. A regularly driven Mulsanne may call for a different emphasis than a lower-mileage collector-kept example, but either way the first requirement is proper fitment. Wheel condition, clearance, and a consistent matched set matter more than chasing appearance alone.
What should I consider when choosing a 265/45R20 tire for a 2018 Bentley Mulsanne?
A 265/45R20 tire is one of the correct primary sizes for the 2018 Bentley Mulsanne Base when the car has 20-inch wheels. The size itself tells you it is a modern metric radial with a 265-millimeter width and 20-inch rim fitment. Matching that exact size is the first step in keeping the intended wheel-to-tire relationship.
From there, focus on the actual condition and setup of the car. Confirm that all four wheels are the same diameter, inspect for any prior wheel changes, and avoid assuming that close-looking 21-inch fitments are interchangeable. A matched replacement set in the correct 20-inch size supports proper mounting and appearance.
How do I choose between the available tire sizes for a 2018 Bentley Mulsanne?
The right choice is not a matter of preference between 265/45R20 and 265/40R21. It depends on which wheel diameter is on the car and which sub-model is being fitted. The Base may use either size, while the Speed uses 265/40R21, so the existing wheel and tire setup should guide the decision.
A quick sidewall check usually answers the question, but it is still wise to confirm all four corners before purchase. Luxury cars sometimes receive wheel changes over time, and mixed setups can create confusion. Once the actual wheel diameter is verified, selection becomes much more straightforward.
Restoration & Appearance
Does correct tire fitment matter for a 2018 Bentley Mulsanne restoration or preservation-focused car?
Yes, correct tire fitment matters on a 2018 Bentley Mulsanne even when the goal is preservation rather than full restoration in the vintage sense. This is a modern flagship sedan, so the proper tire size is tied closely to the wheel configuration and the car’s intended visual balance. Keeping the correct 20-inch or 21-inch fitment preserves that presentation.
Appearance and proportion can change quickly when the wrong size is installed, even if the difference seems small on paper. Owners preserving a well-kept example should confirm the wheel setup already on the car and keep a consistent matched set. That approach supports both visual correctness and practical compatibility.
How does tire size affect the appearance of a 2018 Bentley Mulsanne?
Tire size has a visible effect on a 2018 Bentley Mulsanne because the car uses either a 20-inch or 21-inch wheel fitment with a wide 265-millimeter tire. The two sizes are close in overall diameter, but they present the sidewall differently. That changes how much wheel face versus sidewall appears at the curb.
On a large luxury sedan, those proportions contribute to the car’s overall stance. Choosing the size that matches the wheel already fitted keeps the look cohesive and avoids an obviously mismatched setup. For owners focused on preservation, consistency across all four corners matters just as much as the brand on the sidewall.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2018 Bentley Mulsanne?
Yes, modifications can affect tire fitment on a 2018 Bentley Mulsanne. If the car has aftermarket wheels, altered suspension height, wheel spacers, or body changes, the original relationship between tire size, wheel diameter, and clearance may no longer match the factory-style setup. That is especially important when comparing 20-inch and 21-inch fitments.
A modified Mulsanne should be checked for wheel width, steering clearance, and fender clearance before new tires are installed. Even when the tire size looks correct, a changed wheel or suspension setup can alter how the tire sits in the car. Verifying the actual hardware helps avoid fitment surprises.
What should I inspect before driving a 2018 Bentley Mulsanne on new tires?
Before driving a 2018 Bentley Mulsanne on new tires, inspect the wheel diameter, confirm the mounted tire size matches the car’s setup, and make sure all tires are inflated properly. It is also smart to look over the wheels for damage and check that valve stems, balancing, and installation quality are all in good order.
A short initial drive should include attention to vibration, pulling, and any sign of rubbing at full steering lock. Collector-owned or low-mileage cars deserve an extra look at suspension condition and alignment as well, since tire replacement can reveal issues that were masked by the old set.
How often should tires on a 2018 Bentley Mulsanne be inspected?
Tires on a 2018 Bentley Mulsanne should be inspected regularly, especially if the car is driven infrequently or spends long periods parked. A visual check for uneven wear, cuts, punctures, sidewall damage, and air loss is wise before normal use. Low-mileage luxury cars can age their tires out before they wear them out.
Monthly pressure checks and routine tread and sidewall inspection are good habits, with a closer look before longer trips. Cars kept in storage should also be monitored for flat spotting and age-related cracking. Keeping the tires clean, properly inflated, and out of prolonged heat and sunlight helps protect their condition.
