The 2018 Audi S6 blends executive-sedan comfort with the understated pace expected from Audi’s modern S cars, making it a vehicle where tire choice affects both appearance and day-to-day road manners. Its stance and handling character rely on a low-profile 255/35R20 radial fitment, shared across the covered S6 sub-models. That means the key decision is not sorting through multiple factory sizes, but choosing the right version of that size from the available radial options. Blackwall, raised white letter, and redline presentations all appear here, along with several performance-oriented tire series. Before choosing, confirm the wheel setup on the car and decide whether the priority is modern driving character, visual style, or a cleaner OE-style look.
Which Tire Size Is Right for The 2018 Audi S6
The 2018 Audi S6 uses one primary tire size: 255/35R20, a radial tire for a 20-inch rim. Since both covered sub-models share that same fitment, the real choice is selecting the right tire within the size by considering sidewall style, tire series, wheel compatibility, and how the car is actually driven.
255/35R20 is a modern metric radial size where 255 identifies the nominal section width in millimeters, 35 is the aspect ratio, R indicates radial construction, and 20 is the wheel diameter in inches. On the 2018 Audi S6, this low-profile radial sizing suits the car’s contemporary sport-sedan character and 20-inch wheel package. Available choices include BFGoodrich, Nitto, and Pro-Trac tires, with blackwall, raised white letter, and redline sidewall treatments across several series. The practical decision in this size is choosing the tire that best matches the car’s wheel width, intended use, and preferred appearance.
Tire fitment is straightforward across the covered 2018 Audi S6 sub-models because both use the same primary size. Checking the exact trim still matters when confirming that the wheels on the car remain the original 20-inch setup and have not been changed.
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2018 Audi S6 Premium Plus
The 2018 Audi S6 Premium Plus uses the shared 255/35R20 radial fitment used across this S6 application. Tire selection comes down to choosing among the available radial products, sidewall treatments, and wheel-compatible specifications rather than sorting through multiple primary sizes.
The 2018 Audi S6 Prestige also uses the shared 255/35R20 radial tire size. That keeps fitment simple, so the buyer can focus on tire series, sidewall appearance, and confirming that any existing wheels still match the intended tire’s rim requirements.
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 2018 Audi S6 Tires for Sale
Available 255/35R20 choices for the 2018 Audi S6 include radial tires from BFGoodrich, Nitto, and Pro-Trac. The product grid gives useful comparison points across tire series, blackwall versus raised white letter or redline appearance, and rim-width specifications where stated.
These FAQs focus on the 2018 Audi S6 tire size, 20-inch rim fitment, available radial choices, appearance options, and the checks worth making before road use on a performance-oriented modern sedan.
Tire Size & Fitment
What tire size fits a 2018 Audi S6?
The 2018 Audi S6 uses a 255/35R20 radial tire. That is the primary fitment for both the Premium Plus and Prestige sub-models, so there is no split in tire size across the covered S6 trims.
Knowing the size is only the first step, because tires in 255/35R20 can still vary by tire series, sidewall style, and wheel-width compatibility. It is smart to confirm that the car still has the correct 20-inch wheel setup and has not been changed to an aftermarket package before choosing among the available tires.
What size rim does a 2018 Audi S6 use?
The 2018 Audi S6 uses a 20-inch rim with its 255/35R20 tire size. That 20-inch diameter is central to the fitment, since the tire is built around a 20-inch wheel and should not be matched to a different rim diameter.
Rim diameter should be verified along with actual wheel width, especially if the car has been modified or purchased used. Some 255/35R20 tire choices also state rim-width ranges, so checking the wheel markings helps narrow the product selection and reduces the chance of choosing a tire that does not suit the wheel already on the car.
Do all 2018 Audi S6 sub-models use the same tire size?
Yes. The covered 2018 Audi S6 sub-models, including Premium Plus and Prestige, use the same 255/35R20 radial tire size. That makes fitment simpler than on vehicles where tire size changes with trim level or wheel package.
Even with shared sub-model fitment, the car itself should still be checked before buying tires. A previous owner may have changed wheels, altered ride height, or mixed tire brands over time, so confirming the current wheel diameter and overall setup is still worthwhile before selecting a new set in the correct size.
Choosing the Right Tire
What should I consider when choosing a 255/35R20 tire for a 2018 Audi S6?
Start with the correct size, 255/35R20, then compare the available radial tire series, sidewall style, and any stated wheel-width specifications. For the 2018 Audi S6, the visible choices include BFGoodrich, Nitto, and Pro-Trac options with blackwall, raised white letter, and redline presentations.
The best choice depends on how the car is used and how you want it to look. A cleaner modern appearance may point toward blackwall tires, while RWL or redline versions create a more customized presentation. Wheel width, vehicle setup, and the condition of the suspension should also be checked before settling on one product.
What sidewall styles are available for 2018 Audi S6 tires?
The available 255/35R20 tires for the 2018 Audi S6 include blackwall, raised white letter, and redline sidewall styles. Those choices create noticeably different visual results even though the tire size remains the same.
Blackwall tends to suit a clean modern sport-sedan look, while raised white letter and redline versions lean more toward a custom or enthusiast-oriented presentation. Sidewall style does not change the basic fitment size, but it can strongly influence the finished look of the car, so it helps to decide whether appearance or a subdued factory-inspired look matters more.
What brands offer tires for the 2018 Audi S6?
The available 255/35R20 tire choices for the 2018 Audi S6 include BFGoodrich, Nitto, and Pro-Trac. Those brands appear across several radial tire series, giving the buyer more than one path within the correct size.
Brand should be considered alongside the rest of the specification rather than by itself. Tire series, sidewall presentation, wheel-width compatibility, and even details such as product weight or stated load information may all help separate one option from another when the goal is to match the tire to the car’s current setup and intended use.
Restoration & Appearance
Which tire should I choose for a period-style 2018 Audi S6?
A period-style approach on a 2018 Audi S6 still starts with the correct 255/35R20 radial size. Since this is a modern performance sedan rather than a vintage bias-ply application, the appearance decision is more about sidewall presentation and tire character than about choosing between historic construction types.
Blackwall options usually maintain the cleanest factory-inspired look, while redline or raised white letter versions push the car toward a more personalized visual statement. Buyers who care about preserving the original design feel of the S6 should compare the tire’s sidewall treatment and overall presentation against the car’s wheels, paint, and trim before deciding.
How does tire construction affect the appearance of a restored 2018 Audi S6?
On the 2018 Audi S6, construction is simpler because the primary fitment is already radial. The visual difference here comes less from construction changes and more from the way each radial tire is styled, especially whether it uses a blackwall, raised white letter, or redline sidewall.
That means appearance-focused buyers should pay close attention to the sidewall before focusing on brand alone. A blackwall tire usually keeps the car looking closest to a contemporary executive sport sedan, while the other sidewall treatments create a more customized look that may or may not suit the intended presentation of the finished car.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2018 Audi S6?
Yes. Even though the 2018 Audi S6 uses a 255/35R20 tire on a 20-inch wheel, modifications can change how comfortably that size works on the car. Aftermarket wheels, altered offsets, suspension lowering, or body changes can all affect clearance and overall tire behavior.
That is why the current setup matters as much as the original size callout. A car with non-stock wheels may need close attention to wheel width and clearance at full steering lock or suspension travel. Checking the actual wheel markings and inspecting available space around the tire helps avoid unpleasant surprises after installation.
What should I inspect before driving a 2018 Audi S6 on new tires?
Before driving a 2018 Audi S6 on new tires, inspect the wheels for damage, confirm the tire size and rim diameter, and make sure the tires are mounted and inflated properly. It is also wise to check alignment condition and verify that the suspension and steering components are in sound shape.
A fresh set of tires can only perform as intended if the rest of the chassis is ready for them. Uneven wear patterns, vibration, or rubbing after installation should be addressed quickly, and a short initial road check can reveal issues before longer use. Keeping an eye on pressure and early wear helps protect both handling and tire life.
How often should tires on a 2018 Audi S6 be inspected?
Tires on a 2018 Audi S6 should be inspected regularly for tread wear, cuts, bulges, air loss, and sidewall damage. On a performance-oriented sedan using a low-profile 255/35R20 tire, routine checks are especially worthwhile because less sidewall height leaves less margin for ignoring damage.
A quick visual inspection should become part of normal ownership, especially before highway trips or after contact with potholes or road debris. Cars that are driven less often still need attention, since age, storage conditions, and underinflation can cause trouble even when tread depth looks acceptable. Consistent pressure checks help catch problems early.
