The 2020 Audi A8 Quattro sits at the top of Audi’s luxury sedan range, blending long-wheelbase comfort with all-wheel-drive confidence and a modern chassis that still rewards careful fitment choices. On a car like this, tire selection affects not only appearance, but also ride quality, road manners, and the way the sedan carries its size and weight. The 2020 Audi A8 Quattro uses radial tires in three primary sizes: 255/45R19, 265/40R20, and 275/35R21. Because those sizes vary by wheel package and sub-model, the first step is confirming the exact configuration on the car. From there, the focus shifts to preserving proper dimensions, wheel compatibility, and intended driving character.
Which Tire Size Is Right for The 2020 Audi A8 Quattro
The 2020 Audi A8 Quattro uses three primary tire sizes, and the right one depends on the exact sub-model and wheel diameter on the car. All three are radial metric sizes, but they are tied to different 19-inch, 20-inch, or 21-inch wheel setups. Before selecting a tire, confirm the specific sub-model and verify the actual wheel diameter currently installed, especially if the car has seen wheel changes since new.
255/45R19 is a metric radial size in which 255 identifies the nominal section width in millimeters, 45 is the aspect ratio, R indicates radial construction, and 19 is the wheel diameter in inches. On the 2020 Audi A8 Quattro, this size serves as one of the primary fitments and is shared across all covered sub-models. Its proportions maintain a modern luxury-sedan tire profile while matching a 19-inch wheel package. This is the size to consider when the car is equipped with 19-inch wheels and the goal is to stay with the proper metric radial format for that setup.
265/40R20 is a metric radial size with a 265-millimeter nominal section width, a 40-series profile, radial construction, and a 20-inch rim diameter. It is a primary size for the 2020 Audi A8 Quattro and appears across all covered sub-models, making it an important middle fitment in the range. Compared with the other primary sizes, it corresponds to a distinct wheel package rather than a simple styling variation. This size should be evaluated when the car is already on 20-inch wheels and the aim is to keep the correct wheel-to-tire relationship for that configuration.
275/35R21 is a metric radial size where 275 represents the nominal section width in millimeters, 35 is the aspect ratio, R designates radial construction, and 21 identifies the rim diameter in inches. On the 2020 Audi A8 Quattro, this size applies to certain configurations rather than every covered sub-model. Its low-profile format reflects a larger-wheel setup and makes wheel diameter confirmation especially important before selection. This is the size to pursue when the car is equipped with 21-inch wheels and the owner wants to remain with the proper primary fitment for that package.
Sub-model fitment on the 2020 Audi A8 Quattro is mostly straightforward, but it is not identical across every version. Checking the exact sub-model still matters because the Plug-In Hybrid uses fewer primary size options than the L 3.0 and L 4.0 models.
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2020 Audi A8 Quattro L 3.0
The 2020 Audi A8 Quattro L 3.0 can use 255/45R19, 265/40R20, or 275/35R21 radial tires depending on the wheel setup installed on the car. Tire selection starts with confirming whether the sedan is on 19-inch, 20-inch, or 21-inch wheels, then choosing the proper metric radial size for that configuration.
The 2020 Audi A8 Quattro L 4.0 shares the same three primary radial fitments: 255/45R19, 265/40R20, and 275/35R21. That makes wheel-diameter confirmation the key step, especially on a luxury sedan that may have been fitted with alternate factory-style or aftermarket wheel packages.
The 2020 Audi A8 Quattro L Plug-In Hybrid uses 255/45R19 or 265/40R20 radial tires rather than the full three-size range seen elsewhere in the lineup. For this sub-model, identifying whether the car is on 19-inch or 20-inch wheels is the critical first step before comparing replacement tires.
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 2020 Audi A8 Quattro usually need clarity on the correct tire size, wheel diameter, sub-model differences, and how to choose the right metric radial fitment for a luxury sedan that may have multiple wheel packages.
Tire Size & Fitment
What tire size fits a 2020 Audi A8 Quattro?
The 2020 Audi A8 Quattro uses three primary tire sizes: 255/45R19, 265/40R20, and 275/35R21. All are radial metric sizes, but they do not apply the same way across every covered sub-model. The L 3.0 and L 4.0 use all three sizes, while the L Plug-In Hybrid uses 255/45R19 and 265/40R20.
Choosing the right one starts with confirming the exact sub-model and the wheel diameter currently on the car. On an A8, that matters more than simply knowing the year and model, since a 19-inch, 20-inch, or 21-inch wheel setup requires its matching tire size rather than a general replacement guess.
What size rim does a 2020 Audi A8 Quattro use?
The 2020 Audi A8 Quattro uses 19-inch, 20-inch, and 21-inch rim diameters depending on configuration. Those rim diameters correspond to 255/45R19, 265/40R20, and 275/35R21 tires. The tire size itself tells the rim diameter in its final number, so the installed wheel package and tire size should agree.
Rim diameter is the first detail to verify before shopping because these sizes are tied to different wheel packages, not just different tire preferences. A quick look at the current sidewall and wheel setup can prevent ordering a tire for the wrong diameter, especially on cars that may have had wheel changes after original delivery.
Do all 2020 Audi A8 Quattro sub-models use the same tire size?
No. The 2020 Audi A8 Quattro L 3.0 and L 4.0 use 255/45R19, 265/40R20, and 275/35R21, while the L Plug-In Hybrid uses 255/45R19 and 265/40R20. That means the overall fitment picture is similar across the range, but it is not completely identical.
That difference matters most when the car is equipped with 21-inch wheels, since the Plug-In Hybrid does not share that primary size range here. Matching the tire to both the sub-model and the actual wheel diameter is the safest way to narrow the choice before comparing any brand, tread, or road-use preference.
Choosing the Right Tire
What should I consider when choosing a 2020 Audi A8 Quattro tire?
Start with the correct primary size for the car: 255/45R19, 265/40R20, or 275/35R21, depending on the exact sub-model and wheel package. The 2020 Audi A8 Quattro uses radial metric tires, so the key decision is not bias-ply versus radial, but selecting the right size for the installed wheel diameter and intended use.
Beyond size, consider how the car is actually driven and whether the wheels are original to the vehicle. A luxury sedan with aftermarket wheels, suspension changes, or previous tire substitutions should be checked carefully for wheel width compatibility, clearance at full steering lock, and even wear patterns before settling on a replacement set.
How do I choose between the available 255/45R19, 265/40R20, and 275/35R21 tires for a 2020 Audi A8 Quattro?
Those three sizes are not interchangeable choices for one wheel; they are separate primary fitments for different wheel diameters. A 255/45R19 belongs on a 19-inch wheel, a 265/40R20 belongs on a 20-inch wheel, and a 275/35R21 belongs on a 21-inch wheel. The right choice is the one that matches the wheel package on the car.
Once the installed wheel diameter is confirmed, the comparison becomes much simpler because the remaining decision stays within one correct size. On a car like the A8, that helps preserve proper proportions and avoids mixing tire and wheel dimensions that can create clearance issues or an unintended change in overall fitment.
What does 255/45R19 mean on a 2020 Audi A8 Quattro?
255/45R19 is a metric radial tire size. The 255 is the nominal section width in millimeters, 45 is the aspect ratio, R indicates radial construction, and 19 is the rim diameter in inches. On the 2020 Audi A8 Quattro, it is one of the primary fitments and appears across all covered sub-models.
Understanding that code helps separate width, profile, and wheel diameter so the tire can be matched correctly to the car’s setup. It also makes it easier to confirm whether the current tires belong on the installed wheels, especially when a luxury sedan has changed hands or has been updated with a different wheel package.
Restoration & Appearance
Does correct tire fitment matter for a 2020 Audi A8 Quattro restoration or preservation project?
Yes. Even though the 2020 Audi A8 Quattro is a modern luxury sedan rather than a traditional restoration-era car, keeping the correct tire size for the wheel package still matters for presentation and proper stance. The primary fitments are 255/45R19, 265/40R20, and 275/35R21, depending on the exact configuration.
Preservation-minded owners should confirm what wheel setup the car is meant to carry before replacing tires. That helps maintain the intended look of the sedan and avoids a mismatched appearance from installing a tire size that belongs to a different wheel diameter or sub-model configuration.
Which tire size should I keep for a factory-style appearance on a 2020 Audi A8 Quattro?
A factory-style appearance starts with keeping the primary tire size that matches the wheel diameter already used by the car: 255/45R19, 265/40R20, or 275/35R21. The exact fitment depends on the sub-model and wheel package, so the visual result is tied closely to that original-style combination rather than to the tire size alone.
Matching the proper size to the proper wheel helps preserve the A8’s intended proportions, especially on larger-diameter packages where profile height changes are easy to spot. Owners who want strict originality should also verify the car’s specific wheel equipment through Audi documentation or marque-specific reference material before making a change.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2020 Audi A8 Quattro?
Yes. Wheel changes, suspension lowering, offset changes, or previous substitutions can affect tire fitment on a 2020 Audi A8 Quattro even when the car still appears to use one of its primary sizes. Because this model uses 19-inch, 20-inch, and 21-inch wheel packages, the actual setup on the car matters as much as the original fitment range.
Any modified A8 should be checked for clearance at the fender, suspension, and steering components before replacement tires are chosen. Verifying the current wheel diameter and the complete tire size on the sidewall helps prevent buying a correct-size tire for the wrong wheel or for a setup that has changed from stock.
What should I inspect before driving a 2020 Audi A8 Quattro on new tires?
Before road use, inspect the wheels for damage, confirm that all four tires match the intended size for the wheel package, and check inflation pressure carefully. It is also wise to look over alignment-related wear points, suspension condition, and valve stems so the new tires start on a sound foundation.
A large luxury sedan can be especially sensitive to vibration, uneven wear, and setup issues that were already present before the tire change. A brief check for rubbing during full steering lock, consistent air retention, and smooth straight-line behavior can reveal fitment or chassis problems before they become harder on the new tires.
How often should tires on a 2020 Audi A8 Quattro be inspected?
Tires on a 2020 Audi A8 Quattro should be inspected regularly, not just when tread appears low. Frequent visual checks for uneven wear, cuts, bulges, cracking, and pressure loss are important on any modern luxury sedan, especially one using lower-profile 20-inch or 21-inch fitments where wheel and road impacts can be harder on the tire.
Routine inspection also helps catch alignment, suspension, or inflation issues before they shorten tire life. Owners who drive infrequently should still check the tires because age, long parking periods, and gradual air loss can affect condition even when mileage is low and the car seems to see only light use.
