The 2015 Audi S4 sits in the modern sport sedan sweet spot, blending quattro all-wheel-drive confidence with supercharged performance and understated everyday usability. Buyers are usually balancing two priorities here: preserving the car’s sharp, planted character and matching the wheel package already on the vehicle. This S4 uses radial tires in either 245/40R18 or 255/35R19, depending on sub-model and 19-inch wheel option. Available choices include performance-oriented blackwall tires, along with select redline and raised white letter options in 245/40R18 for a more customized look. The key is confirming whether the car is on 18-inch or 19-inch wheels before comparing tire series, sidewall style, and intended use.
Which Tire Size Is Right for The 2015 Audi S4
The 2015 Audi S4 uses two primary tire sizes, and the first step is confirming whether the car has 18-inch or 19-inch wheels. Fitment changes by sub-model configuration and wheel option, so selecting the right tire starts with identifying the exact setup on the car. Once wheel diameter is confirmed, the decision shifts to tire series, sidewall style, and the type of driving the car will see.
245/40R18 is a modern metric radial size: 245 is the nominal section width in millimeters, 40 is the aspect ratio, R indicates radial construction, and 18 is the wheel diameter in inches. On the 2015 Audi S4, this size suits the 18-inch wheel fitment and keeps the selection focused on modern radial performance tires. Choices in this size include BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac, with blackwall, redline, and raised white letter sidewall treatments. It is the right starting point for buyers who have confirmed an 18-inch wheel and want to compare performance character with visual style.
Fit(s): Premium Plus (19 Inch Option) and Prestige (19 Inch Option)
Construction: Radial|Rim: 19 in
255/35R19 is also a modern metric radial size, with a 255-millimeter nominal section width, a 35-series profile, radial construction, and a 19-inch rim diameter. For the 2015 Audi S4, this size belongs to the 19-inch wheel option rather than the standard 18-inch setup. Available choices center on BFGoodrich performance radial offerings in blackwall form, including several g-Force series options. This size matters for buyers who want to match an existing 19-inch wheel package and compare tires within that lower-profile fitment rather than stepping between wheel diameters.
Sub-model fitment on the 2015 Audi S4 depends mainly on whether the car has the standard 18-inch setup or the 19-inch wheel option. Checking the exact sub-model name and wheel package prevents mixing two valid tire sizes that are not meant for the same rim diameter.
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2015 Audi S4 Premium Plus
The 2015 Audi S4 Premium Plus uses the 18-inch tire fitment, making it the standard wheel-based starting point for tire selection. Once that setup is confirmed, the choice becomes which radial tire series and sidewall style best match the car’s intended street use or customized appearance.
The 2015 Audi S4 Premium Plus with the 19 Inch Option moves to the 19-inch tire fitment, so wheel diameter must be matched exactly before choosing a tire. That puts the focus on selecting among the available blackwall radial performance tires built around this lower-profile size.
The 2015 Audi S4 Prestige uses the same 18-inch tire fitment as the non-optioned Premium Plus configuration. Tire selection here is straightforward once the wheel size is confirmed, with attention turning to brand, performance-oriented tire series, and sidewall presentation.
The 2015 Audi S4 Prestige with the 19 Inch Option uses the 19-inch fitment rather than the 18-inch setup. That makes wheel confirmation especially important, since the correct tire choice depends on staying within the proper rim diameter and comparing tires intended for this specific wheel package.
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 S4 Tires for Sale
Available 2015 Audi S4 tire choices center on modern radial performance tires in 245/40R18 and 255/35R19. Buyers can compare BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac options by tire series, blackwall or custom sidewall treatment, and wheel-width compatibility.
2015 Audi S4 tire questions usually come down to wheel diameter, exact size by sub-model, and how to choose among the available radial performance tires. The FAQs below focus on fitment, sidewall and brand choices, and practical checks before road use.
Tire Size & Fitment
What tire size fits a 2015 Audi S4?
The 2015 Audi S4 uses either 245/40R18 or 255/35R19, depending on the exact sub-model and wheel option. Premium Plus and Prestige models use 245/40R18 in standard form, while the 19 Inch Option versions use 255/35R19.
The important step is matching the tire size to the wheel diameter already on the car. A valid S4 fitment can still be wrong for your vehicle if the rim size does not match, so check the actual wheel setup before comparing brands, sidewall styles, or tire series.
What size rim does a 2015 Audi S4 use?
A 2015 Audi S4 uses either an 18-inch rim or a 19-inch rim, depending on configuration. The 245/40R18 tire fits the 18-inch setup, and the 255/35R19 tire fits the 19-inch option.
Rim diameter is the first fitment checkpoint because neither tire size crosses over to the other wheel. After that, wheel width still matters when comparing specific products, especially on a performance sedan like the S4 where tire profile and wheel package work closely together.
Do all 2015 Audi S4 sub-models use the same tire size?
No. The 2015 Audi S4 has two valid tire sizes across its covered sub-models. Premium Plus and Prestige models use 245/40R18, while Premium Plus (19 Inch Option) and Prestige (19 Inch Option) use 255/35R19.
That means the sub-model name alone is helpful, but the actual wheel package matters just as much. Before choosing a tire, verify whether the car is wearing its original 18-inch or 19-inch setup, especially if the vehicle has changed hands or has had wheel upgrades at some point.
Choosing the Right Tire
What should I consider when choosing a tire for a 2015 Audi S4?
Start with the correct size for the wheel package: 245/40R18 for the standard 18-inch setup or 255/35R19 for the 19-inch option. From there, compare radial tire series, brand, sidewall style, and any product details that relate to how the car will be driven.
A street-driven S4 may call for a different choice than a car being built for a more specialized purpose. It also helps to compare rim-width compatibility, load figures where stated, and whether the tire’s visual presentation should stay understated blackwall or move toward a more custom look.
What sidewall styles are available for 2015 Audi S4 tires?
Blackwall is the main sidewall style available for the 2015 Audi S4 in both fitment sizes. In 245/40R18, there are also redline and RWL, or raised white letter, options through the Pro-Trac Street Pro III series.
That gives 18-inch S4 owners more room to shape the car’s appearance, while 19-inch options stay focused on a conventional performance look. Sidewall style should still be chosen only after confirming the correct size, since visual preference does not override the wheel diameter and fitment requirements.
What brands offer tires for the 2015 Audi S4?
2015 Audi S4 tires are available from BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac, depending on size. The broadest mix appears in 245/40R18, while 255/35R19 centers on BFGoodrich performance radial offerings.
Brand is only one part of the decision. It makes sense to compare each tire’s series, sidewall treatment, and stated rim-width fitment so the choice matches both the car’s wheel setup and the kind of use the S4 will actually see.
Restoration & Appearance
Which tire should I choose for a period-style 2015 Audi S4?
A period-style approach for a 2015 Audi S4 usually starts with staying in the correct wheel-based tire size and choosing a modern radial with a clean, contemporary performance look. Blackwall options in either 245/40R18 or 255/35R19 preserve the understated appearance most buyers associate with this generation.
Appearance choices should follow fitment, not replace it. If the goal is a more individualized presentation, 245/40R18 opens the door to redline or raised white letter options, but the wheel diameter, overall stance, and the car’s intended visual theme should all be considered together.
How does tire construction affect the appearance of a restored 2015 Audi S4?
Tire construction is straightforward on the 2015 Audi S4 because its primary fitments are radial. The visible difference comes less from bias-ply versus radial and more from profile, sidewall finish, and whether the tire uses a plain blackwall or a more expressive redline or raised white letter treatment.
For a restoration-minded or preservation-oriented S4, the safest visual starting point is usually the correct size with a restrained sidewall. Buyers aiming for a specific showroom-era look should compare the car’s original wheel package and period photos before choosing a custom sidewall treatment.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2015 Audi S4?
Yes. A 2015 Audi S4 can be sensitive to wheel and suspension changes because it already uses relatively low-profile tire sizes. Aftermarket wheels, altered offsets, lowering springs, or other suspension changes can affect clearance even when the tire size appears close to stock.
The best approach is to confirm the actual wheel diameter and width on the car, then check steering and fender clearance at full lock and through suspension travel. That matters even more when moving between 18-inch and 19-inch setups or when buying a tire for a modified car.
What should I inspect before driving a 2015 Audi S4 on new tires?
Before putting a 2015 Audi S4 back into regular road use on new tires, inspect wheel condition, verify the tire size matches the rim diameter, and check for proper inflation. It is also worth looking at alignment condition, uneven wear patterns on the old tires, and any signs of rubbing.
A fresh set of tires performs best when the rest of the setup is healthy. Attention should also go to suspension condition, brake clearance, and whether the car has any wheel spacers or aftermarket parts that could affect how the new tires sit and track on the road.
How often should tires on a 2015 Audi S4 be inspected?
Tires on a 2015 Audi S4 should be checked regularly for air pressure, tread condition, cuts, punctures, and sidewall damage. A quick visual inspection before longer drives is smart, and a more careful inspection at routine service intervals helps catch wear or clearance problems early.
Performance-oriented fitments can show problems quickly if alignment drifts or inflation is neglected. It also helps to inspect the inner shoulder area, since low-profile tires may hide wear there until it becomes severe, especially on a car that sees spirited street driving or uneven road surfaces.
