The 2021 Audi A6 Quattro sits in the modern sport-luxury sedan category, blending understated executive styling with all-wheel-drive confidence and the sharper road manners expected from Audi’s Quattro lineup. On a car like this, tire choice has a direct effect on ride quality, steering response, and the visual balance of the wheel-and-tire package. The 2021 Audi A6 Quattro uses radial fitments in two sizes, 245/45R19 and 255/40R20, so the first decision is confirming which wheel diameter is on the car. Available choices center on blackwall performance-oriented radials from BFGoodrich and Nitto, making this page most useful for selecting the right size, series, and wheel-compatible setup.
Which Tire Size Is Right for The 2021 Audi A6 Quattro
The 2021 Audi A6 Quattro uses two primary tire sizes, and both are radial fitments. Because those sizes are tied to different wheel diameters, the first thing to confirm is whether the car is currently on 19-inch or 20-inch wheels. Once that is settled, the decision becomes choosing among the available performance-oriented tire options within the correct size and rim-width range.
Fit(s): Premium 2.0, Premium 3.0, Premium Plus 2.0, Premium Plus 3.0, and Prestige 3.0
Construction: Radial|Rim: 19 in
245/45R19 is a metric radial size in which 245 identifies the nominal section width in millimeters, 45 is the aspect ratio, and 19 is the wheel diameter in inches. On the 2021 Audi A6 Quattro, this is a modern radial fitment that suits a 19-inch wheel setup and keeps the selection focused on contemporary road use rather than vintage-style construction choices. Available options include BFGoodrich and Nitto blackwall tires in series such as g-Force Comp 2 AS, Nitto NT555 G2, and g-Force Phenom T/A. This size is the right place to start when the car is equipped with 19-inch wheels and you want to compare tire character within the proper fitment range.
Fit(s): Premium 2.0, Premium 3.0, Premium Plus 2.0, Premium Plus 3.0, and Prestige 3.0
Construction: Radial|Rim: 20 in
255/40R20 is a metric radial size where 255 represents the nominal section width in millimeters, 40 is the aspect ratio, and 20 identifies the wheel diameter in inches. For the 2021 Audi A6 Quattro, this size belongs to a 20-inch wheel package and reflects a lower-profile modern radial fitment. The available product selection centers on a blackwall BFGoodrich g-Force Phenom T/A, giving this size a more focused product mix than the 19-inch option. It is the size to evaluate when the car has 20-inch wheels and you want to keep the fitment aligned with that wheel diameter and profile.
Fitment across the covered 2021 Audi A6 Quattro sub-models is straightforward because each one is associated with the same two tire sizes. The key step is not identifying trim-specific sizing differences, but confirming whether the car has the 19-inch or 20-inch wheel setup before choosing tires.
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2021 Audi A6 Quattro Premium 2.0
The 2021 Audi A6 Quattro Premium 2.0 is associated with the same two radial tire sizes used across the covered A6 Quattro range. Tire selection comes down to confirming whether this car is on 19-inch or 20-inch wheels, then comparing the available blackwall performance tire options in that size.
The 2021 Audi A6 Quattro Premium 3.0 shares the same radial fitment pattern as the other covered sub-models. That keeps the process focused on wheel-diameter confirmation first, followed by choosing the right 19-inch or 20-inch tire option for the car’s current setup and intended road use.
The 2021 Audi A6 Quattro Premium Plus 2.0 uses the same pair of radial tire sizes found elsewhere in the lineup. The practical decision is verifying which wheel package is actually on the car, then selecting among the available blackwall tire series that match that diameter and rim-width range.
The 2021 Audi A6 Quattro Premium Plus 3.0 follows the same tire-sizing pattern as the other listed A6 Quattro sub-models. That means tire choice depends less on trim name and more on checking for 19-inch versus 20-inch wheels before comparing the available radial product options.
The 2021 Audi A6 Quattro Prestige 3.0 is also associated with both primary radial tire sizes. For this sub-model, the important fitment step is confirming the actual wheel diameter on the vehicle, then selecting the matching tire size and product range for that 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.
Best 2021 Audi A6 Quattro Tires for Sale
Available 2021 Audi A6 Quattro tire choices center on blackwall radial performance tires. The 245/45R19 fitment offers BFGoodrich and Nitto options across the g-Force Comp 2 AS, Nitto NT555 G2, and g-Force Phenom T/A series, while 255/40R20 is represented by BFGoodrich g-Force Phenom T/A.
Common 2021 Audi A6 Quattro tire questions usually come down to the correct size, 19-inch versus 20-inch wheel fitment, available radial product choices, and what to inspect before putting the car back into regular road use.
Tire Size & Fitment
What tire size fits a 2021 Audi A6 Quattro?
The 2021 Audi A6 Quattro uses two primary tire sizes: 245/45R19 and 255/40R20. Both are radial fitments, and each size corresponds to a different wheel diameter, so they are not simply alternate labels for the same wheel-and-tire setup.
The practical first step is checking the wheel diameter currently on the car. A6 Quattro sub-models in this range are associated with both sizes, so the trim name alone does not settle the question. Confirm the actual wheel size, then compare tire choices within the matching size rather than treating the two fitments as interchangeable.
What size rim does a 2021 Audi A6 Quattro use?
The 2021 Audi A6 Quattro uses either a 19-inch or 20-inch rim, depending on which tire size is on the car. The 245/45R19 fitment uses a 19-inch rim, while the 255/40R20 fitment uses a 20-inch rim.
That rim diameter needs to be confirmed before selecting tires, because a 19-inch tire cannot be mounted on a 20-inch wheel and vice versa. It also helps to verify wheel width against the tire’s approved range, especially if the car has aftermarket wheels or a wheel package that differs from what the current trim level might suggest.
Do all 2021 Audi A6 Quattro sub-models use the same tire size?
The covered 2021 Audi A6 Quattro sub-models all share the same two tire sizes: 245/45R19 and 255/40R20. That includes Premium 2.0, Premium 3.0, Premium Plus 2.0, Premium Plus 3.0, and Prestige 3.0.
Because each sub-model is associated with both sizes, identifying the trim alone is not enough to choose a tire. The real fitment question is which wheel diameter is on the car today. Checking the existing sidewall marking or measuring the wheel prevents ordering the right tire series in the wrong size.
Choosing the Right Tire
What should I consider when choosing a 245/45R19 or 255/40R20 tire for a 2021 Audi A6 Quattro?
Start with the correct size for the wheel on the car: 245/45R19 for a 19-inch setup or 255/40R20 for a 20-inch setup. From there, compare construction, tire series, brand availability, sidewall style, approved rim-width range, and useful product details such as load capacity where it is stated.
The 19-inch size offers a broader mix of BFGoodrich and Nitto choices, while the 20-inch size is more narrowly represented. A careful comparison should match the tire to the actual wheel and to how the car will be used, whether that means regular street driving, a more performance-focused feel, or preserving the intended visual balance of the wheel package.
What sidewall styles are available for 2021 Audi A6 Quattro tires?
The available tires for the 2021 Audi A6 Quattro in these sizes are blackwall radials. That applies to the 245/45R19 and 255/40R20 fitments represented here, so the appearance choice is focused on a clean modern sidewall presentation rather than multiple stripe or lettered sidewall styles.
That consistency simplifies the buying decision if the goal is to keep the car’s look understated and contemporary. The next comparison points become tire series, brand, and wheel-width compatibility. On a sedan like the A6 Quattro, those factors usually matter more than sidewall decoration when refining the look and fit of the finished setup.
What brands offer tires for the 2021 Audi A6 Quattro?
BFGoodrich and Nitto both appear in the available tire selection for the 2021 Audi A6 Quattro. BFGoodrich is represented in both 245/45R19 and 255/40R20, while Nitto appears in the 245/45R19 fitment.
Brand is only one part of the decision. It helps to compare the specific tire series in the correct size, along with wheel-width compatibility and any stated load figures that apply to that product. Choosing by size first and product characteristics second is a more reliable approach than trying to select a tire by brand name alone.
Restoration & Appearance
Does correct tire fitment matter for a 2021 Audi A6 Quattro restoration or appearance-focused build?
Yes. Even on a modern vehicle like the 2021 Audi A6 Quattro, the correct tire size matters to the overall stance, wheel proportion, and finished appearance. The two primary fitments, 245/45R19 and 255/40R20, create different visual relationships because they are tied to different wheel diameters and sidewall profiles.
An appearance-focused build should begin with the wheel package actually on the car, then use the matching tire size rather than mixing sizes casually. Blackwall radials keep the presentation clean and contemporary. If originality or exact delivery-era appearance matters, it is worth cross-checking the vehicle’s original wheel package through Audi-specific documentation or build records.
How does tire construction affect the appearance of a restored 2021 Audi A6 Quattro?
For the 2021 Audi A6 Quattro, the primary fitments are radial tires, so the appearance question is not bias-ply versus radial in a vintage sense. Instead, construction is already modern, and the visible differences come more from wheel diameter, sidewall height, and the character of the tire series chosen.
A 19-inch setup with 245/45R19 presents more sidewall than a 20-inch setup with 255/40R20, while both remain clearly modern in look. Since the available products are blackwall radials, the visual effect stays restrained rather than heavily stylized. Matching the tire to the intended wheel package is the key step in keeping the car’s appearance balanced and cohesive.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2021 Audi A6 Quattro?
Yes. Any change to wheel width, wheel offset, suspension height, or body clearance can affect tire fitment on a 2021 Audi A6 Quattro, even when the tire size itself matches one of the primary fitments. The two factory-style sizes also use different wheel diameters, which adds another variable when a car has been altered.
A modified car should be checked at the wheel and fender level before new tires are chosen. Pay attention to steering clearance, suspension travel, and the approved rim-width range for the tire being considered. That matters especially if the car has aftermarket wheels, spacers, or a lowered stance that changes the available space around the tire.
What should I inspect before driving a 2021 Audi A6 Quattro on new tires?
Before putting a 2021 Audi A6 Quattro back into regular road use on new tires, inspect the wheels for damage, confirm the tire size matches the wheel diameter, and make sure the tires are mounted and inflated correctly. It is also wise to look over valve stems, tread condition, and the sidewalls for any visible issues after installation.
A short initial road test can confirm that there is no rubbing, vibration, or air-loss problem. On a modern all-wheel-drive sedan, even small fitment mistakes are worth catching early. Wheel alignment, brake condition, and suspension wear should also be checked if the car has uneven old tire wear or has been sitting for long periods.
How often should tires on a 2021 Audi A6 Quattro be inspected?
Tires on a 2021 Audi A6 Quattro should be inspected regularly, not just when tread looks low. Check them for uneven wear, cuts, bulges, cracking, and pressure loss, especially if the car is driven seasonally or spends long periods parked between trips.
Routine inspection matters because age, storage conditions, and suspension alignment can affect a tire long before it appears completely worn out. A quick walk-around before longer drives is useful, and a closer inspection at service intervals helps catch developing problems earlier. Paying attention to pressure and visible condition is one of the simplest ways to protect both tire life and road manners.
