The 2019 Audi S4 sits in the modern sport-sedan sweet spot, blending everyday refinement with the sharper response expected from Audi’s S-badged lineup. Buyers looking at one today are usually balancing performance character, wheel appearance, and real-world road use rather than searching for a purely restoration-style tire. This car uses radial tires in two primary sizes, 245/40R18 and 245/35R19, depending on wheel setup. That creates a meaningful choice not just in size, but in tire series, sidewall treatment, and intended use, including blackwall, redline, and raised white letter options in 18-inch fitment. The key is confirming which wheel package is on the car before comparing tire styles and specifications.
Which Tire Size Is Right for The 2019 Audi S4
The 2019 Audi S4 uses two primary tire sizes, and the first step is confirming whether the car is on 18-inch or 19-inch wheels. All covered sub-models can use either setup, so the real decision starts with wheel diameter, then moves to the right radial tire within that size based on series, sidewall style, and intended street or performance use.
A 245/35R19 tire uses a 245-millimeter nominal section width, a 35-series aspect ratio, radial construction, and a 19-inch rim. On the 2019 Audi S4, this is a modern low-profile radial fitment suited to cars equipped with 19-inch wheels. Available choices in this size include BFGoodrich and Nitto, with blackwall styling and tire series such as g-Force Comp 2 AS, g-Force Phenom T/A, and NT555 G2. This size is the one to evaluate when preserving the car’s 19-inch wheel package and comparing tire character within that specific wheel diameter.
A 245/40R18 tire also uses a 245-millimeter nominal section width, but with a taller 40-series profile on an 18-inch rim. For the 2019 Audi S4, it remains a primary radial fitment, but it belongs to a different wheel setup than the 19-inch option. Product choices are broader here, with BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac offerings, plus blackwall, redline, and RWL sidewall treatments across several tire series. This size deserves attention when the car is on 18-inch wheels and the buyer wants more variety in appearance or intended use.
Tire fitment is straightforward across the 2019 Audi S4 range because Premium, Premium Plus, and Prestige models share the same two primary tire sizes. The important check is not trim level, but whether the car is wearing 18-inch or 19-inch wheels before choosing a tire.
1
2019 Audi S4 Premium
The 2019 Audi S4 Premium uses the same radial tire fitment pattern as the other covered trims, with both 245/40R18 and 245/35R19 associated with the model. Tire selection comes down to confirming the actual wheel diameter on the car, then comparing the available series, sidewall styles, and specifications within that size.
The 2019 Audi S4 Premium Plus follows the same fitment approach, with 18-inch and 19-inch radial tire sizes both used on this trim. That means the wheel setup matters more than the badge on the decklid, especially when choosing between broader 18-inch product variety and the lower-profile 19-inch option.
The 2019 Audi S4 Prestige shares the same two radial tire sizes found on the other sub-models, so fitment remains consistent across the lineup. The practical step is checking which wheels are currently installed, particularly if the car has been changed from its original wheel package or fitted with aftermarket rims.
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 2019 Audi S4 Tires for Sale
Available 2019 Audi S4 tire choices center on 245/35R19 and 245/40R18 radial fitments from BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac. The main differences are tire series, blackwall versus redline or RWL sidewalls, and wheel-width compatibility within each size.
These FAQs focus on the real 2019 Audi S4 tire questions: which size applies to the car, how 18-inch and 19-inch fitments differ, what product choices exist, and what to inspect before road use.
Tire Size & Fitment
What tire size fits a 2019 Audi S4?
The 2019 Audi S4 uses two primary tire sizes: 245/35R19 and 245/40R18. Both are radial fitments, and the correct choice depends on which wheel diameter is on the car rather than on a different basic tire construction or a separate sub-model-specific size pattern.
That makes wheel confirmation the first step before ordering tires. A car on 19-inch wheels needs the 245/35R19 size, while an 18-inch setup uses 245/40R18. If the S4 has aftermarket wheels or a changed wheel package, check the wheel markings and current tire size so the next set matches the actual setup.
What size rim does a 2019 Audi S4 use?
A 2019 Audi S4 uses either an 18-inch or 19-inch rim, depending on the tire size fitted to the car. The 245/40R18 tire belongs to an 18-inch wheel, and the 245/35R19 tire belongs to a 19-inch wheel.
Rim diameter matters because these two sizes are not meant for the same wheel. Before choosing a tire, read the wheel diameter directly from the tire sidewall or inspect the wheel itself if the car has had wheels changed. Once diameter is confirmed, compare the tire’s rim-width suitability and overall style choices within that exact size.
Do all 2019 Audi S4 sub-models use the same tire size?
Premium, Premium Plus, and Prestige versions of the 2019 Audi S4 share the same two primary tire sizes: 245/35R19 and 245/40R18. In other words, trim level does not create a separate tire-size split among the covered S4 sub-models.
That keeps fitment simpler, but it does not remove the need to verify the actual wheels on the car. One S4 may be wearing 18-inch wheels while another has 19-inch wheels, even within the same trim. Checking the current wheel and tire combination is still the practical step before comparing brands, sidewall treatments, or tire series.
Choosing the Right Tire
What should I consider when choosing a tire for a 2019 Audi S4?
Start with the correct primary size for the wheel package: 245/40R18 for 18-inch wheels or 245/35R19 for 19-inch wheels. From there, compare radial tire construction details such as tire series, sidewall style, rim-width suitability, load figures where stated, and whether the tire is intended for street performance, all-season use, or a more specialized application.
The best comparison is not just size alone, because the available choices have different personalities. Some buyers will focus on a straightforward blackwall performance look, while others may want a redline or raised white letter presentation in 18-inch fitment. Matching the tire to the car’s actual wheel setup and intended use leads to a more informed choice.
What sidewall styles are available for 2019 Audi S4 tires?
Blackwall is the most common sidewall style available for the 2019 Audi S4 in both primary sizes. In 245/40R18, there are also redline and RWL, or raised white letter, options, giving the 18-inch fitment more visible sidewall variety than the 19-inch size.
Sidewall style mainly affects appearance, but it can shape the overall personality of the car. A blackwall keeps the look contemporary and understated, while redline or raised white letters introduce a more stylized presentation. The key is to choose the sidewall treatment within the correct size and wheel diameter instead of treating appearance as separate from fitment.
What brands offer tires for the 2019 Audi S4?
Available brands for the 2019 Audi S4 include BFGoodrich and Nitto in both primary sizes, with M&H Racemaster and Pro-Trac also appearing in 245/40R18. Those brand choices are spread across several radial tire series rather than one uniform product type.
Brand is most useful when viewed alongside the specific size and series you need. An 18-inch S4 owner has broader variety, including appearance-oriented and specialized options, while 19-inch choices are more concentrated. Comparing brand, tire series, sidewall style, and wheel-width suitability within the right size gives a clearer picture than choosing by brand name alone.
Restoration & Appearance
Which tire should I choose for a period-style 2019 Audi S4?
A period-style approach on a 2019 Audi S4 usually starts with keeping the car on its correct wheel diameter and matching tire size rather than trying to force an older-looking fitment. Blackwall tires in either 245/35R19 or 245/40R18 preserve the clean, modern sport-sedan look most closely associated with this generation.
Appearance still leaves room for interpretation, especially on 18-inch wheels where more visual sidewall choices exist. A buyer who wants the car to read closer to its original era should focus on proper size, proportional profile, and restrained presentation first. That keeps the tire choice aligned with the S4’s design language without overreaching into a mismatched vintage style.
How does tire construction affect the appearance of a restored 2019 Audi S4?
On a 2019 Audi S4, tire construction does not create a bias-ply-versus-radial appearance decision because the primary fitments are radial. The visible differences come more from profile, wheel diameter, sidewall treatment, and the specific tire series than from a change in basic construction type.
That means appearance planning should focus on whether the car wears 18-inch or 19-inch wheels and whether a blackwall, redline, or raised white letter sidewall suits the build. A restoration-minded owner should also keep the tire size proportional to the wheel package already on the car, since the S4’s visual balance depends heavily on that relationship.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2019 Audi S4?
Yes. A 2019 Audi S4 may use either 245/40R18 or 245/35R19 in standard fitment, but modifications can change what clears the car properly. Aftermarket wheels, altered offsets, suspension lowering, spacer use, or body changes can all affect how a tire sits relative to fenders, steering components, and suspension travel.
That is why the current setup matters more than assumptions based on model year alone. An S4 that has been modified should be checked for wheel diameter, wheel width, offset, and available clearance before replacing tires. Even when the nominal tire size looks familiar, the actual combination on the car may call for closer measurement and verification.
What should I inspect before driving a 2019 Audi S4 on new tires?
Before road use, inspect the 2019 Audi S4’s wheels for the correct diameter and any visible damage, then confirm the new tires match the intended size. Tire pressure, valve condition, and proper mounting balance deserve attention, and a quick visual check for suspension or alignment issues is worthwhile on a performance sedan.
A short test drive should include listening for rubbing, vibration, or steering pull. It also helps to recheck inflation after the first miles and look again at inner and outer clearances, especially if the car has aftermarket wheels. Catching a fitment or setup issue early is far easier than discovering irregular wear after extended driving.
How often should tires on a 2019 Audi S4 be inspected?
Tires on a 2019 Audi S4 should be inspected regularly, not just when tread looks low. A performance-oriented sedan places real demands on tires, so pressure, tread wear pattern, cuts, punctures, bulges, and sidewall condition all deserve periodic checks even if the car is not driven every day.
Monthly pressure checks are a sensible habit, and a closer inspection before longer trips is smart. Low-mileage collector-style use does not eliminate aging, while frequent use can reveal alignment or wear issues sooner. Looking over the tires consistently helps catch uneven wear, slow air loss, or physical damage before they affect ride quality or road manners.
