The 2020 Audi S4 sits in the modern sport-sedan sweet spot, blending understated Audi design with everyday drivability and serious performance character. Buyers usually come to this car expecting sharp response, confident road manners, and a wheel-and-tire package that supports that balance. For this model, tire fitment centers on two radial sizes, 245/40R18 and 255/35R19, tied to different 18-inch and 19-inch wheel setups. That creates a real choice not just in brand, but also in sidewall presentation and tire series, especially in 18-inch fitment. The right selection starts with confirming the wheel diameter already on the car, then matching the tire to the car's intended street use and overall appearance.
Which Tire Size Is Right for The 2020 Audi S4
The 2020 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 three covered sub-models can use either radial fitment, so the real decision starts with wheel diameter, then moves to the tire series, sidewall style, and product characteristics that best match how the car is driven and presented.
245/40R18 is a modern metric radial size: 245 identifies the nominal section width in millimeters, 40 is the aspect ratio, R denotes radial construction, and 18 is the wheel diameter in inches. On the 2020 Audi S4, this size supports an 18-inch setup with a lower-profile performance-oriented look and feel. Available choices include Blackwall, Redline, and RWL sidewall treatments from brands such as BFGoodrich, Nitto, Pro-Trac, and M&H Racemaster across several tire series. This size is the one to evaluate when the car is already equipped with 18-inch wheels and you want to compare both performance-focused and appearance-driven options.
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 wheel diameter. For the 2020 Audi S4, it belongs to the 19-inch wheel package and carries a distinctly low-profile performance fitment. Current options in this size center on Blackwall tires from BFGoodrich in multiple g-Force series. This is the size to focus on when the car wears 19-inch wheels and the priority is staying with the proper wheel diameter while comparing series differences within that performance-oriented fitment.
Tire fitment is straightforward across the covered 2020 Audi S4 sub-models because Premium, Premium Plus, and Prestige all use the same two primary sizes. What matters most is confirming whether the car has the 18-inch or 19-inch wheel setup before narrowing the tire choice.
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2020 Audi S4 Premium
The 2020 Audi S4 Premium uses the same radial fitment pattern as the rest of the range, with one size tied to 18-inch wheels and the other to 19-inch wheels. Tire selection comes down to confirming the actual wheel package on the car, then comparing available brands, sidewall styles, and tire series within that diameter.
The 2020 Audi S4 Premium Plus shares the same two primary radial tire sizes used across the covered S4 lineup. That keeps fitment simple, but wheel diameter still needs to be checked first so the chosen tire matches the car's existing 18-inch or 19-inch setup.
The 2020 Audi S4 Prestige follows the same tire-size pattern as Premium and Premium Plus, with fitment determined by wheel diameter rather than a unique sub-model-only size. Once the wheel package is confirmed, the decision shifts to product character, sidewall appearance, and the intended balance between presentation and road use.
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 S4 Tires for Sale
Available 2020 Audi S4 tires cover both primary sizes and several distinct buying paths. The 18-inch fitment offers the broadest mix, with BFGoodrich, Nitto, Pro-Trac, and M&H Racemaster options in Blackwall, Redline, and RWL styles, while the 19-inch fitment centers on BFGoodrich performance-oriented Blackwall tires.
2020 Audi S4 tire questions usually come down to wheel diameter first, then the right size, product style, and maintenance checks for a modern sport sedan. These FAQs cover fitment, rim choice, sidewall options, product selection, and road-use considerations.
Tire Size & Fitment
What tire size fits a 2020 Audi S4?
The 2020 Audi S4 uses two primary tire sizes: 245/40R18 and 255/35R19. Both are radial fitments, and each size belongs to a different wheel diameter, so the correct choice depends on whether the car is equipped with 18-inch or 19-inch wheels.
Premium, Premium Plus, and Prestige all use this same size pattern, so sub-model alone does not narrow it further. The practical next step is checking the actual wheel diameter on the car, especially if it has been changed since new, then selecting a tire in the matching size and diameter.
What size rim does a 2020 Audi S4 use?
A 2020 Audi S4 uses either an 18-inch or 19-inch rim, depending on which of its two primary tire sizes is on the car. The 245/40R18 fitment belongs to an 18-inch wheel, while the 255/35R19 fitment belongs to a 19-inch wheel.
That rim diameter has to match the tire size exactly, so it is the first thing to confirm before comparing products. Looking only at trim level is not enough, because all covered S4 sub-models can use either size pattern and some cars may now be running a different wheel package.
Do all 2020 Audi S4 sub-models use the same tire size?
Premium, Premium Plus, and Prestige share the same two tire sizes on the 2020 Audi S4: 245/40R18 and 255/35R19. The fitment does not split into separate sub-model-only sizes, but it does split by wheel diameter.
That means the key check is not which trim badge is on the car, but which wheels are actually installed. Once the 18-inch or 19-inch setup is confirmed, the remaining choice is between the available tire series, brands, and sidewall treatments offered in that correct size.
Choosing the Right Tire
What should I consider when choosing a 2020 Audi S4 tire?
Start with the correct size and wheel diameter, because the 2020 Audi S4 uses either 245/40R18 or 255/35R19 radial tires. After that, compare the available tire series, sidewall style, and product character to match the way the car is used on the street.
An 18-inch setup gives the broadest range of choices, including Blackwall, Redline, and RWL options, while the 19-inch fitment is more concentrated around Blackwall performance tires. Rim-width suitability, load capacity details, and the overall presentation of the car are all worth comparing before making a final selection.
What sidewall styles are available for 2020 Audi S4 tires?
Sidewall style depends on tire size. In 245/40R18, available sidewall treatments include Blackwall, Redline, and RWL, giving the 2020 Audi S4 a wider appearance range. In 255/35R19, the current choices are Blackwall tires.
That matters if the car's look is part of the decision as much as its handling character. A Blackwall keeps a straightforward modern performance appearance, while Redline or raised white letter styling changes the visual tone without changing the fact that the tire still needs to match the correct wheel diameter.
What brands offer tires for the 2020 Audi S4?
Available brands for the 2020 Audi S4 include BFGoodrich, Nitto, Pro-Trac, and M&H Racemaster. The 245/40R18 fitment has the broadest brand spread, while the 255/35R19 fitment is currently centered on BFGoodrich offerings.
Brand is only one part of the choice, so it helps to compare each tire's series, sidewall treatment, and wheel-width compatibility within the correct size. That approach keeps the focus on fitment and intended use instead of assuming that a familiar brand name alone determines the best option.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2020 Audi S4?
Yes. A 2020 Audi S4 can be affected by aftermarket wheels, suspension changes, lowered ride height, or body modifications even when the tire size looks close to the original fitment. Changes like those can alter clearance, wheel-width suitability, and how the tire sits within the fender opening.
Checking the actual wheel diameter is only the first step. It is also smart to inspect wheel width, offset, steering clearance, and the space around the tire at full lock and normal ride height, especially if the car no longer carries its original wheel-and-suspension setup.
What should I inspect before driving a 2020 Audi S4 on new tires?
Before road use, inspect tire pressure, bead seating, visible sidewall condition, and tread surfaces, then confirm that the tire size matches the wheel diameter on the car. A 2020 Audi S4 should also be checked for any signs of rubbing, especially after installation or alignment work.
It also helps to verify the wheels for damage and make sure the suspension and steering components are in sound condition. A short initial drive followed by a second visual check can reveal clearance issues or air loss early, before the car is put into regular service.
How often should tires on a 2020 Audi S4 be inspected?
Tires on a 2020 Audi S4 should be inspected regularly, not just when tread looks worn. A performance sedan can be sensitive to pressure changes, uneven wear, and damage from potholes or curbs, so routine visual checks are worthwhile even when mileage is relatively low.
Monthly pressure checks and periodic inspections for cuts, bulges, cracking, and unusual wear patterns are a sensible baseline. It is also wise to inspect the tires before longer drives or seasonal use changes, especially if the car sits for stretches and is not driven every day.
