2021 Audi A5 Quattro Tires

The 2021 Audi A5 Quattro uses either 245/40R18 or 255/35R19 radial tires. The correct size depends on the exact sub-model and, just as importantly, whether the car is equipped with 18-inch or 19-inch wheels.

Premium Cabriolet and Premium Coupe models use 245/40R18, while Premium Plus, Prestige Cabriolet, and Prestige Coupe versions may use either size. The most useful first check is the actual wheel diameter on the vehicle, especially if the car has had wheel changes or came with an alternate trim-level setup.

A 2021 Audi A5 Quattro uses either an 18-inch or 19-inch rim, depending on the tire size on the car. The 245/40R18 fitment goes with an 18-inch wheel, while 255/35R19 goes with a 19-inch wheel.

That rim diameter difference is central to correct tire selection, because an 18-inch tire cannot be used on a 19-inch wheel and vice versa. Before replacing tires, confirm the wheel diameter cast or stamped on the wheel, then compare tire options within that exact size rather than selecting by appearance alone.

No, all 2021 Audi A5 Quattro sub-models do not use the same tire size. Some sub-models use only 245/40R18, while Premium Plus, Prestige Cabriolet, and Prestige Coupe configurations may use either 245/40R18 or 255/35R19.

That means trim name alone is not always enough to choose a tire without checking the wheel setup on the car. Looking at the existing tire sidewall and confirming wheel diameter will usually settle the question quickly, which helps prevent buying the right type of tire in the wrong size.

Start with the correct primary size for the car, then compare construction, rim-width suitability, tire series, and sidewall style. Both 245/40R18 and 255/35R19 are radial fitments, but they serve different wheel diameters and should not be treated as interchangeable choices.

Once size is confirmed, the decision becomes more specific. Some 18-inch options add appearance choices such as redline or raised white letter styling, while 19-inch options stay focused on blackwall performance radials. Matching the tire to the car’s actual wheels and your intended use will matter more than choosing by brand name alone.

Sidewall styles for the 2021 Audi A5 Quattro include blackwall across both primary sizes, plus redline and raised white letter options in 245/40R18. That gives the 18-inch fitment a broader appearance range than the 19-inch fitment shown here.

Blackwall is the conventional modern presentation, while redline and raised white letter styling create a more customized look. Sidewall appearance should still be a secondary decision after confirming the car’s correct tire size and wheel diameter, since style options only matter once the fitment path has been narrowed properly.

Tires for the 2021 Audi A5 Quattro are available here from BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac, depending on size. The 245/40R18 fitment has the widest variety, while 255/35R19 centers on BFGoodrich performance-oriented options.

Brand choice is best treated as part of a larger comparison that includes tire series, sidewall style, and wheel compatibility. A buyer selecting 18-inch tires may have more visual variety, while a buyer staying with 19-inch fitment is comparing a narrower group of blackwall radial choices within the correct size.

A period-style approach on a 2021 Audi A5 Quattro still begins with the correct modern radial size for the specific wheel setup. For 18-inch applications, 245/40R18 gives the broadest appearance choices, including blackwall, redline, and raised white letter options.

Since this is a modern vehicle rather than a restoration-era classic, appearance usually means choosing a look that suits the car rather than chasing factory-authenticated originality. The best path is to confirm the correct fitment first, then decide whether a subtle blackwall or a more distinctive sidewall treatment matches the presentation you want.

On the 2021 Audi A5 Quattro, construction does not create a bias-ply-versus-radial appearance question because the primary fitments are radial. The visual difference comes more from sidewall treatment, tire series character, and whether the car wears the 18-inch or 19-inch setup.

That makes the 245/40R18 fitment especially relevant for owners who want more styling choice, since it includes redline and raised white letter offerings alongside standard blackwalls. A carefully presented A5 Quattro benefits most from a tire that matches the wheel diameter correctly and supports the overall look without compromising fitment.

Yes, modifications can affect tire fitment on a 2021 Audi A5 Quattro. Aftermarket wheels, altered wheel widths, suspension changes, or lowering can all change how a 245/40R18 or 255/35R19 tire sits in the wheel opening and how much clearance remains.

A car that has been changed from its original wheel setup should be checked carefully before replacing tires by size alone. Wheel diameter is only the start; wheel width, offset, and clearance at the fender, suspension, and steering range all matter when confirming that the selected tire suits the actual vehicle configuration.

Before driving a 2021 Audi A5 Quattro on new tires, inspect wheel condition, confirm the correct tire size, and make sure inflation is set appropriately for the tire and vehicle. It is also smart to look for any signs of rubbing, uneven suspension height, or previous alignment-related wear on the old tires.

A short, careful road test can reveal vibration, pull, or clearance issues that are easier to address early. It also helps to recheck pressure after installation and confirm that the tire sidewall, wheel diameter, and overall setup match the sub-model and wheel package the car is actually using.

Tires on a 2021 Audi A5 Quattro should be inspected regularly, not just when tread looks low. Frequent checks for air loss, irregular wear, cuts, cracking, bulges, and impact damage are especially important on lower-profile sizes such as 245/40R18 and 255/35R19.

Cars that see seasonal use or long parked periods still need routine tire attention because age and storage conditions matter as much as mileage. A quick visual inspection before longer drives, plus periodic pressure checks and alignment awareness, helps preserve both fitment integrity and the handling character expected from the A5 Quattro.