2021 Audi S5 Tires

The 2021 Audi S5 uses three primary tire sizes: 245/40R18, 255/35R19, and 265/30R20. All are radial sizes, but they do not apply across every trim in the same way, so there is not one universal answer for every S5 coupe or cabriolet.

The practical first step is to confirm the exact sub-model and the wheel diameter currently on the car. Premium versions use 18-inch or 19-inch fitments, while several Premium Plus and Prestige configurations can also use 20-inch fitments, so replacement shopping should always start with the actual wheel package.

A 2021 Audi S5 can use 18-inch, 19-inch, or 20-inch rims, depending on the specific trim and wheel package. Those rim diameters match the three primary tire sizes used on the model: 245/40R18, 255/35R19, and 265/30R20.

Rim diameter matters before anything else because each tire size is built around a specific wheel size. Checking the wheel itself is especially important on cars that may have had wheel changes, since moving between 18, 19, and 20 inches affects which replacement tires can even be considered.

No, 2021 Audi S5 sub-models do not all use the same tire size. Premium coupe and cabriolet versions use 245/40R18 or 255/35R19, while Premium Plus and Prestige models can also use 265/30R20 in addition to the 18-inch and 19-inch fitments.

That variation means trim level alone is helpful, but wheel confirmation is still the deciding factor. Two cars with the same body style may not share the same replacement tire size if one has a larger wheel package, so checking the installed tire and wheel before ordering remains the safest approach.

Start with the correct size for the car's actual wheel package, since the 2021 Audi S5 uses 245/40R18, 255/35R19, or 265/30R20 depending on configuration. After that, compare radial tire series, rim-width compatibility where stated, load figures where available, and whether the tire's purpose matches street, performance, or specialty use.

Appearance can also shape the decision, especially in 245/40R18 where blackwall, redline, and RWL options are available. A car kept close to a modern OEM-style presentation may point one direction, while a more personalized build may point another, but the correct size and wheel match still come first.

Sidewall choice is most visible in the 245/40R18 fitment, where blackwall, redline, and RWL options are available. In the 255/35R19 fitment, the currently visible options are blackwall performance radials, so appearance choice is more limited in that size.

That means sidewall styling can become part of the buying decision if the S5 is running 18-inch wheels. Redline or raised white letter tires create a more customized look, while blackwalls maintain a cleaner modern presentation, so the right choice depends on the car's intended appearance as much as the fitment.

2021 Audi S5 tire options in the covered sizes include BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac. Brand availability depends on size, with the broadest visible selection appearing in 245/40R18 and a narrower, BFGoodrich-focused group in 255/35R19.

Brand is only one part of the comparison. It helps to look at the tire series, sidewall treatment, intended use, and wheel-width suitability alongside the brand name so the final choice matches both the car's setup and the way the car will actually be driven.

A period-style approach on a 2021 Audi S5 usually still begins with the correct modern radial size for the car's wheel package. Within that framework, 245/40R18 offers the most visible appearance variation, including blackwall, redline, and RWL choices, while still staying within the vehicle's proper size family.

Because this is a recent performance Audi rather than a vintage restoration car, appearance choice is more about the look you want than historical authenticity. Matching the tire to the exact wheel diameter and maintaining proportions close to the intended fitment matters more than chasing a style that does not suit the car's setup.

On a 2021 Audi S5, construction does not create a bias-ply versus radial decision because the primary fitments are radial. The visual difference comes more from the tire's sidewall styling and series character than from switching between construction types.

That makes size and sidewall treatment the bigger appearance variables. A blackwall tire keeps the look closer to contemporary sport-coupe presentation, while redline or raised white letter options in 245/40R18 can give the car a more personalized visual tone without changing the underlying radial construction.

Yes, modifications can affect tire fitment on a 2021 Audi S5. Wheel changes, altered offset, suspension lowering, and other chassis changes can all influence whether a tire in the original size range still has the right relationship to the fender, steering components, and overall clearance envelope.

That is especially important on a car that already spans 18-inch, 19-inch, and 20-inch fitments from the factory. A modified S5 should have its actual wheel diameter, width, and surrounding clearance checked carefully before replacement tires are chosen, even if the size looks familiar at a glance.

Before road use, check that the new tires match the correct size for the car's wheel package and that they are mounted on the proper rim diameter. It also makes sense to inspect inflation pressure, wheel condition, valve stems, and visible clearance around the suspension and fender openings.

A short initial drive should be followed by another look at pressure and any signs of rubbing or unusual contact. On a performance car like the S5, even small fitment mistakes can show up quickly, so confirming installation details early helps prevent wear, noise, and clearance problems from being overlooked.

Tires on a 2021 Audi S5 should be inspected regularly, not only when tread looks low. Pressure, tread condition, uneven wear, cuts, bulges, and sidewall damage all deserve routine attention, especially on low-profile performance sizes where visual changes can affect ride quality and handling feel quickly.

A check before longer drives and at regular service intervals is a sensible routine. Cars that see seasonal use or long periods parked should also have their tires examined for age-related cracking and air loss, since storage can hide issues that are not obvious until the car is back on the road.