The 2015 Audi S6 sits in the modern super-sedan tradition, combining understated executive styling with the kind of speed and composure that made the S6 badge especially appealing to drivers who wanted serious performance without leaving luxury behind. Tire choice matters on a car like this because chassis balance, steering response, and overall stance depend heavily on the correct size. The 2015 Audi S6 uses radial tires in two fitments, 255/40R19 and 255/35R20, so the first step is confirming which wheel diameter is on the car. From there, the decision centers on sidewall style, tire series, and whether the goal is a contemporary performance look or a more distinctive visual presentation.
Which Tire Size Is Right for The 2015 Audi S6
The 2015 Audi S6 uses two primary tire sizes, and both apply to the Base model in radial construction. The key difference is wheel diameter: 255/40R19 fits a 19-inch rim, while 255/35R20 fits a 20-inch rim. Before choosing a tire, confirm which wheels are actually on the car, especially if it has been changed from its original wheel setup.
A 255/35R20 tire uses a 255-millimeter section width, a 35-series aspect ratio, radial construction, and a 20-inch rim diameter. On a 2015 Audi S6, this size supports a lower-profile performance-oriented look while staying within the vehicle’s correct primary fitment range. Available choices include BFGoodrich, Nitto, and Pro-Trac, with Blackwall, raised white letter, and Redline sidewall treatments, plus series such as g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and Street Pro III. This size is the one to evaluate if the car is running 20-inch wheels and appearance matters as much as road feel.
A 255/40R19 tire keeps the same 255-millimeter section width but uses a 40-series aspect ratio on a 19-inch rim. For the 2015 Audi S6, it is the companion primary fitment for cars equipped with 19-inch wheels, so wheel diameter must be matched correctly before comparing products. BFGoodrich and Pro-Trac offerings bring different tire-series choices and sidewall presentations, including Blackwall, raised white letter, and Redline. This size makes the most sense when the car retains or currently uses 19-inch wheels and the goal is to compare tire character and appearance within the proper fitment.
Sub-model fitment is straightforward here because the covered 2015 Audi S6 Base uses both primary tire sizes. The real fitment question is not trim level but wheel diameter, so identifying whether the car has 19-inch or 20-inch wheels comes first.
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2015 Audi S6 Base
The 2015 Audi S6 Base uses both of the model’s primary radial tire sizes, depending on whether the car is fitted with 19-inch or 20-inch wheels. Tire selection therefore starts with wheel confirmation, then moves to comparing available tire series and sidewall styles within the correct 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 2015 Audi S6 Tires for Sale
Available 2015 Audi S6 tires center on 255/35R20 and 255/40R19 radial fitments from BFGoodrich, Nitto, and Pro-Trac. The main differences in the product grid are tire series, Blackwall versus RWL or Redline sidewalls, and rim-width compatibility where stated.
Owners of a 2015 Audi S6 usually need clarity on the correct tire size, wheel diameter, sidewall choices, product differences, and what to inspect before driving on fresh or recently installed tires. These FAQs stay focused on those exact fitment and selection questions.
Tire Size & Fitment
What tire size fits a 2015 Audi S6?
The 2015 Audi S6 uses two primary tire sizes: 255/40R19 and 255/35R20. Both are radial fitments, and both apply to the S6 Base depending on which wheel diameter is installed on the car.
That means the first thing to verify is not trim level but the actual wheel size on the vehicle. A 19-inch wheel takes 255/40R19, while a 20-inch wheel takes 255/35R20. If the car has aftermarket wheels or a previous owner changed the setup, confirm the wheel diameter before comparing tire series or sidewall styles.
What size rim does a 2015 Audi S6 use?
A 2015 Audi S6 uses either a 19-inch or 20-inch rim, depending on which of its two correct tire sizes is on the car. The 255/40R19 fitment uses a 19-inch rim, and the 255/35R20 fitment uses a 20-inch rim.
Rim diameter is the critical match point because a 19-inch tire cannot be mounted on a 20-inch wheel, and the reverse is also true. Once diameter is confirmed, compare the tire’s approved rim-width range where stated, especially if the S6 has non-stock wheels that may differ from the usual factory-style width.
Does the 2015 Audi S6 Base use the same tire size?
The 2015 Audi S6 Base can use both correct tire sizes for this model: 255/40R19 and 255/35R20. The size does not change because of a separate trim break within the Base designation; it changes with wheel diameter.
That makes wheel confirmation the practical next step. Looking only at the sub-model name is not enough, because the Base can appear with either 19-inch or 20-inch wheels. Check the tire sidewall already on the car, inspect the wheel diameter, and then compare available products in the matching size rather than assuming one fitment applies to every S6 Base.
Choosing the Right Tire
What should I consider when choosing a 255/35R20 or 255/40R19 tire for a 2015 Audi S6?
Start by choosing the size that matches the wheel diameter on the car, since the 2015 Audi S6 uses both 255/35R20 and 255/40R19 depending on setup. After that, compare radial tire series, sidewall treatment, stated rim-width range where available, and product specifications such as weight or load information.
The right choice depends on how the car is used and how you want it to present visually. Blackwall options keep a modern, understated look, while RWL and Redline options add more visual character. It also helps to confirm that any replacement matches the existing wheel width and that the car’s suspension and alignment are in good condition before installation.
What sidewall styles are available for 2015 Audi S6 tires?
2015 Audi S6 tires in the correct sizes are available with several sidewall styles, including Blackwall, RWL, and Redline. Those choices appear across the 255/35R20 and 255/40R19 fitments, giving the car either a contemporary low-key look or a more pronounced visual accent.
Sidewall style does not change the need to stay with the correct tire size for the wheel, but it can strongly affect the car’s appearance. A Blackwall usually suits a clean modern performance presentation, while raised white letter and Redline styles create a more customized look. Pick the sidewall after confirming the correct wheel diameter and tire size.
What brands offer tires for the 2015 Audi S6?
Tires for the 2015 Audi S6 are available from BFGoodrich, Nitto, and Pro-Trac in the covered 255/35R20 and 255/40R19 sizes. Those brands span several radial tire series, including g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, Nitto NT555 G2, and Street Pro III.
Brand choice is only one part of the decision. It still helps to compare the specific tire series, sidewall style, and wheel-width compatibility shown for the size you need. On an S6, the better buying approach is to narrow the correct fitment first, then decide whether the goal is a subtle Blackwall performance look or a more distinctive sidewall presentation.
Restoration & Appearance
Which tire should I choose for a period-style 2015 Audi S6?
A period-style 2015 Audi S6 still begins with the correct modern radial size for the wheel on the car, either 255/40R19 or 255/35R20. From there, appearance is shaped more by sidewall treatment and tire series than by any vintage-style construction question, since this is a modern radial-fitment performance sedan.
A Blackwall tire gives the S6 a restrained factory-inspired presentation, while RWL or Redline choices create a more customized look. Exact originality claims should be checked against window-sticker information, original sales literature, or marque-specific references if that level of detail matters. For most owners, the best appearance decision comes after wheel size is confirmed.
How does tire construction affect the appearance of a restored 2015 Audi S6?
Construction is straightforward on a 2015 Audi S6 because the primary fitments are radial, not bias-ply. That means appearance differences come less from construction type and more from profile, wheel diameter, and sidewall styling within the correct radial size.
On a modern performance sedan like the S6, a 19-inch setup with 255/40R19 and a 20-inch setup with 255/35R20 each create a distinct visual stance while remaining within proper fitment. Sidewall choices such as Blackwall, RWL, or Redline further shape the finished look. Keeping the size matched to the wheel matters just as much as the visual style you choose.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2015 Audi S6?
Yes. Modifications can affect tire fitment on a 2015 Audi S6 even when the tire size itself is one of the correct primary options. Wheel changes, altered wheel width, offset differences, suspension lowering, or body modifications can all influence clearance and how the tire sits on the car.
That matters most when selecting between 255/40R19 and 255/35R20 or when replacing tires on wheels that may not be original to the car. Check wheel diameter first, then confirm width and available clearance at the fender, suspension, and steering range. A tire that matches the size code still needs to suit the actual wheel and vehicle setup.
What should I inspect before driving a 2015 Audi S6 on new tires?
Before driving a 2015 Audi S6 on new tires, inspect that the installed size matches the wheel diameter, check inflation, and make sure each tire is seated properly on the rim. It also helps to look over the wheels themselves for damage and confirm that lug hardware is correct and secure.
A short, careful road test can reveal rubbing, vibration, or alignment issues that were not obvious during installation. Recheck for clearance at full steering lock if the car has aftermarket wheels or a lowered stance. Since the S6 is a high-performance sedan, stable tracking and even tire behavior are worth confirming before longer or faster driving.
How often should tires on a 2015 Audi S6 be inspected?
Tires on a 2015 Audi S6 should be inspected regularly rather than only when replacement is due. Look at them during routine pressure checks and before longer drives, paying attention to tread wear, cuts, bulges, punctures, and any signs of uneven wear that might point to alignment or suspension issues.
Low-profile performance tires can hide problems until they begin affecting ride quality or steering feel, so frequent visual checks are worthwhile. It is also smart to inspect the inner sidewall and shoulder areas, not just the outer tread face. Any recurring air loss, vibration, or unusual wear pattern deserves attention before the car returns to normal road use.
