The 2019 Audi A8 Quattro sits at the top of Audi’s modern luxury-sedan range, combining all-wheel-drive confidence with the quiet, long-wheelbase character expected from a flagship car. Buyers looking at this exact model are usually balancing premium ride quality, precise handling, and the clean, understated presentation that suits a full-size German sedan. Tire fitment centers on two radial sizes, 255/45R19 and 265/40R20, so the first step is confirming which wheel diameter is on the car. From there, the decision is less about vintage-style construction and more about matching the correct metric size to the vehicle’s wheel setup, appearance, and intended road use.
Which Tire Size Is Right for The 2019 Audi A8 Quattro
The 2019 Audi A8 Quattro uses two primary tire sizes, and the correct choice depends on wheel diameter before anything else. This fitment is radial in both cases, with one size built for a 19-inch rim and the other for a 20-inch rim. The A8 Quattro L 3.0 can use either size, so selecting tires starts with confirming the wheels actually on the car rather than assuming one size fits every setup.
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 2019 Audi A8 Quattro, this size suits a 19-inch wheel and aligns with the car’s modern luxury-sedan fitment style. It is a useful choice for owners keeping the factory-style 19-inch wheel setup on an A8 Quattro L 3.0. Before replacing tires, confirm the actual wheel diameter on the car and compare the tire size on the sidewall to avoid mixing 19-inch and 20-inch applications.
265/40R20 is a metric radial size where 265 is the nominal section width in millimeters, 40 is the aspect ratio, R marks radial construction, and 20 identifies the wheel diameter in inches. On the 2019 Audi A8 Quattro, this size belongs to a 20-inch wheel setup and reflects the larger-diameter option used on this model line. It is the size to evaluate when the car is equipped with 20-inch wheels rather than the 19-inch fitment. Checking the wheel itself is essential, since the difference between the two A8 Quattro sizes is tied directly to rim diameter.
Sub-model fitment is straightforward here, but wheel choice still matters. The 2019 Audi A8 Quattro L 3.0 can use either of the two radial tire sizes, so the key step is confirming whether the car has 19-inch or 20-inch wheels before selecting tires.
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2019 Audi A8 Quattro L 3.0
The 2019 Audi A8 Quattro L 3.0 uses radial tires and can be found with either of the two primary metric sizes for this model. Tire selection therefore starts with verifying the wheel diameter on the car, then matching the replacement tire to that exact 19-inch or 20-inch setup.
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
Common questions for the 2019 Audi A8 Quattro usually center on choosing between the two metric radial sizes, confirming rim diameter, and checking how wheel or suspension changes may affect fitment and road use.
Tire Size & Fitment
What tire size fits a 2019 Audi A8 Quattro?
The 2019 Audi A8 Quattro uses two primary tire sizes: 255/45R19 and 265/40R20. Both are radial metric sizes, and the correct one depends on the wheel diameter installed on the car. The A8 Quattro L 3.0 can use either of these sizes, so there is not a single universal fitment across every wheel setup.
The most important check is the actual wheel diameter, since a 19-inch tire cannot be mounted on a 20-inch wheel and vice versa. Reading the current tire sidewall and confirming the wheel size before replacement helps avoid ordering the right size for the model but the wrong size for the specific car.
What size rim does a 2019 Audi A8 Quattro use?
The 2019 Audi A8 Quattro uses either a 19-inch or 20-inch rim, depending on which primary tire size is on the car. The 255/45R19 size is built for a 19-inch rim, while the 265/40R20 size is built for a 20-inch rim. Both fitments are radial and belong to this exact model line.
Rim diameter should be confirmed before comparing any replacement tires, because it is the first fitment decision on this vehicle. Once that is established, the next step is making sure the new tire matches the same size format and that wheel condition, tire clearance, and the car’s current setup all remain appropriate.
Why does the 2019 Audi A8 Quattro have more than one tire size?
The 2019 Audi A8 Quattro has more than one tire size because it can be equipped with different wheel diameters. One fitment uses 255/45R19 on a 19-inch rim, while the other uses 265/40R20 on a 20-inch rim. Both belong to the same model family rather than indicating a different tire construction type.
That means the buyer’s job is to identify the wheel setup on the specific car instead of choosing between sizes by preference alone. A larger wheel diameter changes the required tire size, so the correct replacement begins with the existing wheel and sidewall markings rather than the year, make, and model alone.
Choosing the Right Tire
What should I consider when choosing a tire for a 2019 Audi A8 Quattro?
Start with the exact tire size already fitted to the car, either 255/45R19 or 265/40R20, because the 2019 Audi A8 Quattro uses two different rim diameters. Both fitments are radial, so the main selection issue is matching the proper metric size to the actual wheel setup rather than choosing between bias-ply and radial construction.
After confirming size, compare the intended use of the car, whether it is mostly highway driving, everyday use, or lower-mileage luxury ownership. It is also smart to inspect wheel condition, verify there is no mismatch between front and rear sizes, and make sure any replacement tire remains appropriate for the car’s present wheel and suspension configuration.
How do I choose between the available 255/45R19 and 265/40R20 tires for a 2019 Audi A8 Quattro?
Choosing between 255/45R19 and 265/40R20 is not a matter of preference alone, because each size matches a different wheel diameter on the 2019 Audi A8 Quattro. The 19-inch wheel setup requires 255/45R19, and the 20-inch wheel setup requires 265/40R20. The correct tire is the one that matches the wheels currently on the car.
Once the wheel diameter is confirmed, compare tires within that exact size rather than jumping between the two fitments. Checking the sidewall on the existing tires, confirming the spare if applicable, and measuring the wheel before purchase can prevent confusion, especially on cars that may have had wheel changes since new.
Which tire size should I use for my 2019 Audi A8 Quattro L 3.0?
The 2019 Audi A8 Quattro L 3.0 can use either 255/45R19 or 265/40R20, depending on the wheel package on the car. Both are radial metric sizes tied to this sub-model. That means the right choice is determined by the actual wheel diameter rather than by the sub-model name alone.
A quick check of the current tire sidewall or the wheel itself usually answers the question immediately. If the car has been modified with aftermarket wheels, verify the exact diameter and current tire size before replacing anything, because a changed wheel setup can alter what is appropriate even when the vehicle is still an A8 Quattro L 3.0.
Restoration & Appearance
Does correct tire fitment matter for a 2019 Audi A8 Quattro restoration or preservation project?
Yes, correct tire fitment still matters on a 2019 Audi A8 Quattro preservation project, even though this is a modern luxury sedan rather than a vintage restoration candidate. Using the proper 255/45R19 or 265/40R20 size helps maintain the car’s intended stance, wheel-to-tire proportion, and overall presentation. Matching the installed wheel diameter is the starting point.
Owners preserving a clean, original-style appearance should avoid treating the two sizes as interchangeable just because both belong to the same model. If appearance authenticity is especially important, compare the car’s current wheels to original equipment references, window-sticker information, or marque-specific documentation before deciding which fitment best suits the vehicle.
How does tire size affect the appearance of a 2019 Audi A8 Quattro?
Tire size has a visible effect on the appearance of a 2019 Audi A8 Quattro because the car uses two different wheel diameters. A 255/45R19 belongs to a 19-inch wheel setup, while a 265/40R20 belongs to a 20-inch setup. That changes the visual relationship between wheel, sidewall, and body in a noticeable way.
For an owner trying to maintain a clean, intended look, the smartest approach is to match the replacement tire to the wheel package already on the car. Mixing sizes without confirming the wheels can upset that visual balance and create fitment issues, especially if the sedan has already seen aftermarket wheel, suspension, or ride-height changes.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2019 Audi A8 Quattro?
Yes, modifications can affect tire fitment on a 2019 Audi A8 Quattro. Wheel changes, altered offset, suspension lowering, or other chassis modifications can change the clearance relationship between the tire and the car, even when the tire size itself looks close to one of the original fitments. That is especially important on a large luxury sedan with two wheel-diameter options.
A car with aftermarket wheels should have wheel diameter, width, and tire clearance checked before replacement tires are chosen. Steering clearance, fender room, and suspension travel all matter, so the safest approach is to verify the actual setup on the vehicle rather than assuming the original 19-inch or 20-inch fitment still applies unchanged.
What should I inspect before driving a 2019 Audi A8 Quattro on new tires?
Before driving a 2019 Audi A8 Quattro on new tires, confirm that all four tires match the intended size for the wheel setup and that inflation is set correctly for the application. It is also wise to inspect each wheel for damage and make sure the tires seat properly and clear the suspension and bodywork at normal ride height.
A short road test should be followed by another visual check for rubbing, irregular stance, or any sign of air loss. Attention should also go to alignment condition, especially if the previous tires showed uneven wear, because even the correct 255/45R19 or 265/40R20 size will not perform as intended if the underlying setup needs correction.
How often should tires on a 2019 Audi A8 Quattro be inspected?
Tires on a 2019 Audi A8 Quattro should be inspected regularly, not just when replacement time arrives. Routine checks should include inflation pressure, tread wear, cuts, punctures, bulges, and any cracking in the sidewall. On a vehicle that sees lower annual mileage, age and condition can become just as important as remaining tread depth.
A good habit is to inspect the tires before longer drives and any time the car has been parked for an extended period. Owners should also keep an eye on uneven wear patterns, since those can point to alignment or suspension issues that affect ride quality and tire life even when the tire size itself is correct.
