The 2017 Audi A8 Quattro sits at the top of Audi’s full-size luxury sedan range, blending long-wheelbase comfort with the composed, all-weather character expected from the Quattro name. For buyers at this level, tire choice is not just about size on paper but about preserving ride quality, steering response, and the visual balance of the car. This A8 Quattro uses radial tire fitments in 255/45R19, 265/40R20, and 275/35R21. That makes wheel diameter the first thing to confirm, especially since both covered sub-models share all three sizes. Once the wheel setup is verified, the focus shifts to choosing the right profile for the car’s existing configuration and intended road use.
Which Tire Size Is Right for The 2017 Audi A8 Quattro
The 2017 Audi A8 Quattro uses three primary tire sizes, and the key difference is wheel diameter: 19-inch, 20-inch, or 21-inch. Both the L 3.0 and L 4.0 sub-models can use these radial fitments, so the first step is confirming which wheels are actually on the car before choosing a tire.
255/45R19 is a metric radial size in which 255 is the nominal section width in millimeters, 45 is the aspect ratio, R identifies radial construction, and 19 is the wheel diameter in inches. On the 2017 Audi A8 Quattro, this size represents the 19-inch wheel fitment and keeps the selection process centered on a modern radial tire format. With an overall diameter of 28.04 inches and section width of 10.04 inches, it provides a useful baseline when confirming the car’s existing wheel-and-tire setup. This is the size to choose when the car is equipped with 19-inch wheels and the goal is to stay with the proper original diameter class.
265/40R20 is a metric radial size that uses a 265-millimeter nominal section width, a 40-series profile, radial construction, and a 20-inch rim diameter. For the 2017 Audi A8 Quattro, it serves as the 20-inch fitment and sits between the other two sizes in both profile and wheel diameter. Its stated overall diameter is 28.35 inches with a section width of 10.43 inches, which helps keep replacement decisions grounded in the car’s actual wheel package. This size should be evaluated when the sedan is already running 20-inch wheels and a tire choice needs to match that setup rather than another factory wheel diameter.
275/35R21 is a metric radial size with a 275-millimeter nominal section width, a 35-series aspect ratio, radial construction, and a 21-inch wheel diameter. On the 2017 Audi A8 Quattro, this is the 21-inch fitment and the largest wheel-and-tire package used across the covered sub-models. The tire dimensions of 28.58 inches overall diameter and 10.83 inches section width make it important to match the existing wheel size precisely before replacing anything. This is the correct path when the car is already fitted with 21-inch wheels and the goal is to maintain that larger-diameter configuration.
Tire fitment is straightforward across the covered 2017 Audi A8 Quattro sub-models because both share the same three radial size options. What matters most is confirming the exact wheel diameter on the car, since sub-model name alone does not narrow the fitment to one size.
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2017 Audi A8 Quattro L 3.0
The 2017 Audi A8 Quattro L 3.0 can use all three primary radial sizes offered for this model family. Tire selection starts with confirming whether the car has 19-inch, 20-inch, or 21-inch wheels, then choosing a replacement that matches that existing wheel package.
The 2017 Audi A8 Quattro L 4.0 also shares the full range of 19-inch, 20-inch, and 21-inch radial fitments. That means the practical decision is not trim-related but wheel-related, so the existing wheel diameter should be verified before comparing tire options.
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 2017 Audi A8 Quattro usually need clarity on which of the three tire sizes matches the car, how wheel diameter affects fitment, and what to inspect before replacement or road use. The questions below focus on size selection, rim fitment, appearance of the sizing formats, and practical checks for a full-size luxury sedan.
Tire Size & Fitment
What tire size fits a 2017 Audi A8 Quattro?
The 2017 Audi A8 Quattro uses three radial tire sizes: 255/45R19, 265/40R20, and 275/35R21. Those sizes apply across the covered A8 Quattro L 3.0 and L 4.0 sub-models, so the car does not narrow to one size by engine designation alone.
The practical step is confirming which wheels are currently on the car. A 19-inch wheel takes 255/45R19, a 20-inch wheel takes 265/40R20, and a 21-inch wheel takes 275/35R21. Tire selection should start with the actual wheel diameter already installed, especially if the car has changed hands or has had wheel upgrades.
What size rim does a 2017 Audi A8 Quattro use?
A 2017 Audi A8 Quattro uses 19-inch, 20-inch, or 21-inch rims, depending on which tire size is on the car. The matching tire sizes are 255/45R19 for 19-inch rims, 265/40R20 for 20-inch rims, and 275/35R21 for 21-inch rims.
That makes rim diameter the first fitment point to verify before replacing tires. Looking only at the model name is not enough, because both covered sub-models can use all three wheel diameters. Checking the existing tire sidewall or measuring the wheel prevents choosing the right tire size for the wrong rim.
Do all 2017 Audi A8 Quattro sub-models use the same tire size?
The covered 2017 Audi A8 Quattro sub-models share the same three primary tire sizes rather than one single universal size. Both the A8 Quattro L 3.0 and A8 Quattro L 4.0 can use 255/45R19, 265/40R20, or 275/35R21, depending on wheel package.
That means the sub-model badge does not settle the tire question by itself. A buyer should verify the wheel diameter already on the vehicle and match the replacement tire to that setup. This matters most on luxury cars that may have changed wheels over time or moved between seasonal tire and wheel sets.
Choosing the Right Tire
What should I consider when choosing a tire for a 2017 Audi A8 Quattro?
Start with the correct size for the wheel already on the car: 255/45R19, 265/40R20, or 275/35R21. Because the 2017 Audi A8 Quattro uses modern radial sizes across multiple rim diameters, the first decision is matching the tire to the actual wheel rather than choosing by sub-model name alone.
After size is confirmed, compare the tire’s stated dimensions against the existing setup and think about how the car is used. A long-wheelbase luxury sedan benefits from maintaining the intended wheel-and-tire relationship, so clearance, ride expectations, and consistency across all four corners deserve attention before final selection.
How do I choose between the available 2017 Audi A8 Quattro tire sizes?
The three sizes are not interchangeable choices for the same wheel. A 2017 Audi A8 Quattro on 19-inch rims uses 255/45R19, on 20-inch rims uses 265/40R20, and on 21-inch rims uses 275/35R21, so the deciding factor is the wheel diameter already fitted to the car.
Once that is confirmed, compare the tire dimensions to the current setup rather than moving between sizes casually. The listed overall diameters are close, but each size is designed around a different rim. Keeping the proper match helps avoid unnecessary fitment questions involving wheel compatibility, suspension clearance, or appearance.
What does 255/45R19 mean on a 2017 Audi A8 Quattro?
On a 2017 Audi A8 Quattro, 255/45R19 is a metric radial size. The 255 is the nominal section width in millimeters, 45 is the aspect ratio, R means radial construction, and 19 is the rim diameter in inches.
Reading the size correctly helps prevent one of the most common replacement mistakes: choosing a tire that matches the model but not the wheel. The same logic applies to 265/40R20 and 275/35R21. Before ordering or mounting, confirm the complete sidewall size on the current tires and make sure all four wheels use the same intended fitment.
Restoration & Appearance
Does correct tire fitment matter for a 2017 Audi A8 Quattro restoration?
Yes, correct tire fitment still matters on a 2017 Audi A8 Quattro, even though it falls into a more modern luxury segment than an earlier collector car. Using the proper 19-inch, 20-inch, or 21-inch size helps preserve the car’s intended proportions and keeps the wheel-and-tire package visually appropriate.
Appearance on a late-model flagship sedan comes as much from stance and sidewall profile as from wheel design. A replacement should match the actual wheel diameter on the car and maintain a clean, uniform presentation. For owners pursuing an especially original look, factory literature and marque-specific references are useful final checks.
How does tire sizing affect the appearance of a 2017 Audi A8 Quattro?
Tire sizing affects how the 2017 Audi A8 Quattro sits visually, especially because its three fitments pair different sidewall profiles with different wheel diameters. A 255/45R19, 265/40R20, and 275/35R21 each create a different balance between sidewall height and wheel presence.
That makes it important to match the tire to the wheel package already on the car rather than choosing by width alone. On a large luxury sedan, the wrong size can look out of place even before clearance or handling concerns appear. Maintaining the intended size family usually gives the most coherent visual result.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2017 Audi A8 Quattro?
Yes, modifications can affect tire fitment on a 2017 Audi A8 Quattro. Changes such as aftermarket wheels, altered offsets, suspension lowering, spacer use, or body modifications can influence whether 255/45R19, 265/40R20, or 275/35R21 remains the right working size for the car.
That is why the current setup should be checked before replacing tires by catalog size alone. Confirm wheel diameter first, then verify wheel width, tire-to-fender clearance, and steering clearance on the actual vehicle. This step is especially important when the car no longer wears its original wheel package.
What should I inspect before driving a 2017 Audi A8 Quattro on new tires?
Before driving a 2017 Audi A8 Quattro on new tires, inspect basic condition and installation points: proper size match, correct wheel diameter, inflation pressure, valve condition, and even seating on the rim. It also helps to look over suspension and alignment condition so the new tires start on a sound foundation.
A careful walk-around after installation can catch issues early. Check for rubbing at full steering lock, confirm there is no visible bulge or unusual sidewall distortion, and recheck pressure after the first drives. On a large, heavy luxury sedan, small setup issues can become noticeable quickly in ride quality and tire wear.
What should I check before a longer drive in a 2017 Audi A8 Quattro?
Before a longer drive, check tire pressure, tread condition, visible cracking, cuts, bulges, and any signs of slow air loss. On a 2017 Audi A8 Quattro, it is also smart to confirm that all four tires match the intended size for the wheel package currently on the car.
A long trip is the wrong time to discover an old tire, an underinflated tire, or a mismatch between wheel and sidewall size. A brief inspection of the spare strategy, if applicable, and a check of steering feel during the first miles can add confidence. Consistent maintenance matters as much as correct fitment.
