The 2020 Audi S6 sits in the modern sport-sedan space where understated luxury meets serious performance, blending executive-car refinement with the sharper pace expected from Audi’s S models. For owners, tire selection is less about vintage construction choices and more about confirming the exact wheel setup on the car. This Audi S6 uses radial tires in two fitments, 255/40R20 and 255/35R21, with the key difference being wheel diameter rather than overall tire stature. That makes wheel confirmation the first step, followed by comparing available tire options, sidewall presentation, and intended road use. A careful fitment check matters even more if the car has been changed from its original wheel package.
Which Tire Size Is Right for The 2020 Audi S6
The 2020 Audi S6 uses two primary tire sizes, and the first decision is confirming whether the car is on 20-inch or 21-inch wheels. Both available sizes are radial metric fitments and are used across Premium Plus and Prestige trims, so wheel diameter is the real separator before comparing tire choices.
255/35R21 is a metric radial size where 255 identifies nominal section width in millimeters, 35 is the aspect ratio, R marks radial construction, and 21 is the wheel diameter in inches. On the 2020 Audi S6, this size belongs to the 21-inch wheel setup and keeps the tire choice tied closely to wheel confirmation first. It represents a low-profile modern performance fitment rather than a vintage sizing system. This is the size to evaluate when the car is already equipped with 21-inch wheels and clearance, wheel condition, and exact wheel specification have all been confirmed.
255/40R20 is a metric radial size with a 255-millimeter nominal section width, a 40-series aspect ratio, radial construction, and a 20-inch rim diameter. For the 2020 Audi S6, this size serves the 20-inch wheel package and is available in a Blackwall BFGoodrich g-Force Phenom T/A offering. The size follows the same modern metric convention buyers see on current performance sedans, making it easy to read once wheel diameter is confirmed. This fitment is the right one to compare when the car runs 20-inch wheels and the goal is matching the proper size before weighing product specifications.
Tire fitment is straightforward across the covered 2020 Audi S6 sub-models because both Premium Plus and Prestige use the same two tire sizes. The important step is confirming which wheel diameter is actually on the car before selecting a tire.
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2020 Audi S6 Premium Plus
The 2020 Audi S6 Premium Plus uses the same two radial fitments found across this model range, so the key detail is whether it is on the 20-inch or 21-inch wheel package. Once that is confirmed, tire selection becomes a matter of matching the correct size and comparing the available product characteristics.
The 2020 Audi S6 Prestige follows the same fitment pattern, with radial tires in both the 255/40R20 and 255/35R21 sizes depending on wheel setup. That means the tire decision starts with wheel diameter confirmation rather than trim level, then moves to product choice within the proper size.
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 2020 Audi S6 Tires for Sale
Current product selection centers on the 255/40R20 fitment, with a BFGoodrich g-Force Phenom T/A radial available in Blackwall form. Buyers comparing options in this size should focus on correct wheel diameter first, then rim-width compatibility, load specification, and overall intended use.
Owners of a 2020 Audi S6 usually need to sort out wheel diameter first, then compare radial tire choices, trim-level fitment, and road-use considerations. The questions below focus on size selection, rim fitment, product choice, and practical checks before driving.
Tire Size & Fitment
What tire size fits a 2020 Audi S6?
The 2020 Audi S6 uses two primary tire sizes: 255/40R20 and 255/35R21. Both are radial metric fitments, and both appear across the Premium Plus and Prestige sub-models, so the size on a particular car depends on which wheel package it has rather than on trim alone.
The most important next step is checking the actual wheel diameter on the car before choosing a tire. Since both sizes have different rim diameters, a 20-inch tire and a 21-inch tire are not interchangeable. Cars with aftermarket wheels or changed wheel packages should also have wheel width and clearance reviewed before replacement.
What size rim does a 2020 Audi S6 use?
A 2020 Audi S6 uses either a 20-inch rim or a 21-inch rim, depending on which of its two tire sizes is on the car. The 255/40R20 fitment belongs to a 20-inch wheel, while the 255/35R21 fitment belongs to a 21-inch wheel.
That makes rim confirmation essential before ordering replacement tires. Looking only at the trim badge is not enough, because both Premium Plus and Prestige can use either fitment. A quick check of the current tire sidewall or wheel measurement helps prevent a mismatch, especially on cars that may have had wheels changed since new.
Do all 2020 Audi S6 sub-models use the same tire size?
Premium Plus and Prestige do not narrow the fitment to one single tire size. Both sub-models use the same two possible radial sizes, 255/40R20 and 255/35R21, so the determining factor is the wheel package installed on the individual car.
For the buyer, that means sub-model identification helps less than wheel verification. A replacement tire should match the wheel diameter already on the vehicle unless the entire wheel-and-tire setup is being evaluated together. Any car with non-original wheels, spacers, or suspension changes deserves an extra clearance and specification check before purchase.
Choosing the Right Tire
What should I consider when choosing a 255/40R20 tire for a 2020 Audi S6?
Start by confirming that the car actually uses the 255/40R20 fitment and not the 255/35R21 setup. In the available 255/40R20 product range, important comparison points include radial construction, Blackwall appearance, load specification, and the approved rim-width range for the tire.
The 255/40R20 BFGoodrich g-Force Phenom T/A fits rims from 8.5 to 10 inches wide and carries a maximum load of 1819 pounds at 50 psi. Those details matter when matching the tire to the wheel already on the car. Buyers should also consider how the S6 is driven, whether as a daily road car or a performance-oriented sedan.
What sidewall styles are available for 2020 Audi S6 tires?
The available product selection for the 2020 Audi S6 includes a Blackwall tire in the 255/40R20 size. That gives the car the clean, modern sidewall presentation most buyers expect on a contemporary performance sedan rather than a restoration-style visual treatment.
Sidewall style may be a smaller issue on a modern S6 than correct size and wheel compatibility, but it still affects the final look of the car. A Blackwall typically suits the restrained performance character of the model. The more important step is making sure the sidewall style comes in the exact size that matches the wheel package.
What brands offer tires for the 2020 Audi S6?
The available product range for this fitment currently includes BFGoodrich in the 255/40R20 size, specifically within the g-Force Phenom T/A series. That keeps brand comparison focused and straightforward, with the main decision centered on matching the correct fitment before looking deeper at product specifications.
On a 2020 Audi S6, brand choice only matters after wheel diameter and tire size are confirmed. A strong-looking product still has to match the proper rim diameter and wheel width range. If the car is on 21-inch wheels, a 20-inch product offering should not be treated as a substitute just because it is for the same model.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2020 Audi S6?
Yes. Wheel changes, suspension lowering, spacers, and other chassis modifications can all affect tire fitment on a 2020 Audi S6, even when the tire size appears close to stock. Because this model already uses low-profile metric radial sizes, small changes in wheel setup can have a noticeable effect on clearance.
A car with aftermarket wheels should have its wheel diameter, width, and overall tire clearance checked before replacement. Steering lock clearance and fender room deserve attention as well. Even when the tire sidewall shows one of the correct S6 sizes, the actual wheel setup may differ enough to change what works safely on the vehicle.
What should I inspect before driving a 2020 Audi S6 on new tires?
Before road use, inspect the wheel condition, verify that the installed tire size matches the wheel diameter, and confirm proper inflation for the tire and vehicle setup. It is also smart to look over the tread surface and sidewalls for shipping or mounting damage before the car goes back into regular use.
A 2020 Audi S6 places real demands on its tires, so the check should go beyond simple installation. Lug hardware, alignment condition, and suspension wear can all influence how a fresh set of tires behaves. A short initial drive followed by a recheck of pressure and any signs of rubbing helps catch fitment issues early.
What should I check before a longer drive in a 2020 Audi S6?
Before a longer drive, confirm tire pressure, inspect tread and sidewalls, and make sure the car is riding on the correct tire size for its wheel package. On a 2020 Audi S6, that means verifying whether the car is using 255/40R20 or 255/35R21 before assuming the tires are properly matched.
Longer highway use can reveal issues that short local trips do not, especially on performance sedans with low-profile tires. It is worth checking for uneven wear, vibration, slow air loss, and any signs of contact near the fenders or suspension. Cars that sit for stretches should also be inspected for age-related deterioration before returning to regular road duty.
