The 2021 Audi A5 Sportback blends coupe-like styling with four-door practicality, making it one of the more design-forward luxury sportbacks of its era. Its appeal comes from that balance of everyday usability and sharp road manners, so tire choice has a real effect on how the car looks and responds. This model uses radial tire fitments in either 245/40R18 or 255/35R19, depending on trim and configuration. Available choices range from blackwall performance-oriented radials to redline and raised white letter options in the 18-inch size. The key is confirming the exact sub-model and wheel diameter before deciding between a stock-style replacement look and a more customized presentation.
Which Tire Size Is Right for The 2021 Audi A5 Sportback
The 2021 Audi A5 Sportback uses two primary tire sizes, and the correct one depends on the exact sub-model and wheel diameter. Both fitments are radial, but one uses an 18-inch rim and the other uses a 19-inch rim, so the first step is confirming which wheels are on the car before comparing brands, sidewall styles, or tire series.
Fit(s): Premium (201 hp), Premium (261 hp), Premium Plus (201 hp), Premium Plus (261 hp), Prestige (201 hp), and Prestige (261 hp)
Construction: Radial|Rim: 18 in
245/40R18 is a metric radial size in which 245 identifies the nominal section width in millimeters, 40 is the aspect ratio, R denotes radial construction, and 18 is the rim diameter in inches. On the 2021 Audi A5 Sportback, this size supports the car’s modern road manners while keeping fitment tied to an 18-inch wheel. Available options include blackwall designs from M&H Racemaster, BFGoodrich, and Nitto, plus Pro-Trac Street Pro III versions with redline or RWL styling. It is the right size to evaluate when the car is equipped with the 18-inch wheel setup and the owner wants either a contemporary performance look or a more customized sidewall treatment.
Fit(s): Premium (261 hp), Premium Plus (201 hp), Premium Plus (261 hp), Prestige (201 hp), and Prestige (261 hp)
Construction: Radial|Rim: 19 in
255/35R19 is a metric radial size where 255 is the nominal section width in millimeters, 35 is the aspect ratio, R indicates radial construction, and 19 identifies the wheel diameter in inches. For the 2021 Audi A5 Sportback, this size belongs to configurations using a 19-inch wheel and gives the buyer a distinctly different fitment path from the 18-inch setup. The available choices in this size come from BFGoodrich across g-Force Comp 2 AS, g-Force Sport Comp 2, and g-Force Phenom T/A series, all in blackwall form. It is the size to consider only after confirming the car actually carries the 19-inch wheel package.
Tire fitment on the 2021 Audi A5 Sportback varies by sub-model, and several trims can use either of the two primary sizes. Checking the exact trim and horsepower configuration matters, but wheel diameter is the final confirmation before selecting a tire.
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2021 Audi A5 Sportback Premium (201 hp)
The 2021 Audi A5 Sportback Premium (201 hp) uses the 245/40R18 radial tire size. That keeps tire selection focused on the 18-inch fitment, where the decision becomes brand, performance-oriented series, and whether a blackwall, redline, or raised white letter presentation suits the car.
The 2021 Audi A5 Sportback Premium (261 hp) can be found with either 245/40R18 or 255/35R19 radial tires. The important step here is verifying whether the car has 18-inch or 19-inch wheels before comparing tire options, since the two sizes are tied to different rim diameters.
The 2021 Audi A5 Sportback Premium Plus (201 hp) uses either 245/40R18 or 255/35R19 radial tires. That means tire selection starts with the wheel on the car, then moves to the available product choices within the correct size and sidewall style.
The 2021 Audi A5 Sportback Premium Plus (261 hp) can use both primary A5 Sportback tire sizes, depending on wheel setup. Confirming the installed rim diameter is more important than trim name alone, because the 18-inch and 19-inch fitments lead to different tire choices.
The 2021 Audi A5 Sportback Prestige (201 hp) appears with either 245/40R18 or 255/35R19 radial fitment. Choosing correctly means checking the actual wheel diameter first, then deciding among the available series and sidewall treatments in that specific size.
The 2021 Audi A5 Sportback Prestige (261 hp) also uses either 245/40R18 or 255/35R19, depending on configuration. Once the wheel size is confirmed, the decision shifts to the tire’s character and appearance rather than wondering whether both primary sizes apply at the same time.
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 2021 Audi A5 Sportback Tires for Sale
Available 2021 Audi A5 Sportback tires center on the 245/40R18 and 255/35R19 radial sizes, with choices from BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac. Buyers can compare blackwall performance series across both sizes, while the 18-inch fitment also adds redline and RWL appearance options.
A5 Sportback tire questions usually come down to identifying the correct wheel diameter, understanding the two primary sizes, and comparing radial tire options by brand, sidewall style, and intended use. The answers below focus on fitment, selection, appearance, and practical road-use checks for this exact model.
Tire Size & Fitment
What tire size fits a 2021 Audi A5 Sportback?
The 2021 Audi A5 Sportback uses two primary tire sizes: 245/40R18 and 255/35R19. Both are radial fitments, but they do not apply universally across every configuration, because some sub-models use only the 18-inch size while others can use either size depending on wheel setup.
The practical step is to confirm the exact sub-model and then verify whether the car has 18-inch or 19-inch wheels. Once that is settled, tire shopping becomes much more straightforward, since the correct size determines which product series, sidewall treatments, and rim-width specifications belong in the comparison.
What size rim does a 2021 Audi A5 Sportback use?
A 2021 Audi A5 Sportback uses either an 18-inch or 19-inch rim, depending on the tire size fitted to the car. The 245/40R18 size belongs to an 18-inch wheel, while the 255/35R19 size belongs to a 19-inch wheel.
That rim diameter difference is the most important fitment checkpoint on this model, because the two tire sizes are built around different wheels. Reading the size on the existing tire sidewall is a quick first step, but it is still wise to confirm the wheel itself before replacing tires on a car that may have been changed from its original setup.
Why does the 2021 Audi A5 Sportback have more than one tire size?
The 2021 Audi A5 Sportback has more than one tire size because fitment varies across sub-models and wheel configurations. Some versions use 245/40R18 only, while others can be equipped with either 245/40R18 or 255/35R19, tying tire choice to the actual wheel package on the car.
That means trim name alone is not always enough to select a replacement tire. Checking the existing sidewall size and matching it to the installed wheel diameter will narrow the search immediately, and it also helps avoid comparing 18-inch and 19-inch options that belong to different fitment paths.
Choosing the Right Tire
What should I consider when choosing a tire for a 2021 Audi A5 Sportback?
Start with the correct primary size for the car: 245/40R18 or 255/35R19. From there, the important comparisons are radial construction details, wheel compatibility, tire series, sidewall style, and whether the tire’s intended character suits everyday street use, a more performance-focused setup, or specialized use such as drag racing.
The 18-inch fitment offers the widest appearance range, including blackwall, redline, and RWL options, while the 19-inch fitment stays focused on blackwall performance-style selections. Matching the tire to how the A5 Sportback is actually driven usually leads to a better decision than choosing by looks alone.
What sidewall styles are available for 2021 Audi A5 Sportback tires?
Sidewall style depends on size. In 245/40R18, available choices include blackwall, redline, and RWL, while 255/35R19 is available in blackwall form among the current tire selections.
That gives the 18-inch setup more room for a customized visual treatment, especially if the goal is to add a stronger performance or retro-inspired accent. The 19-inch size stays more understated, so buyers focused on keeping a modern luxury-sport appearance often end up comparing tread and series differences rather than sidewall styling.
What brands offer tires for the 2021 Audi A5 Sportback?
Tires for the 2021 Audi A5 Sportback are available from BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac. Brand availability varies by size, with BFGoodrich appearing in both primary fitments and the broader mix of brands concentrated in the 245/40R18 size.
Brand choice is best used as one part of the comparison rather than the whole decision. After confirming the correct size, look at the tire series, sidewall treatment, rim-width specification, and intended use, since those details do more to separate one option from another than the brand name alone.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2021 Audi A5 Sportback?
Yes, modifications can affect tire fitment on a 2021 Audi A5 Sportback. Aftermarket wheels, altered offsets, suspension changes, or lowering can change the clearance relationship even when the tire size looks close to the original 245/40R18 or 255/35R19 fitment.
A car with changes from stock should be checked at the wheel, not just by trim name. Measuring the installed wheel diameter and width, then inspecting clearance at the fender, steering, and suspension points, helps avoid selecting a tire that matches the size code but does not suit the actual setup on the vehicle.
What should I inspect before driving a 2021 Audi A5 Sportback on new tires?
Before driving a 2021 Audi A5 Sportback on new tires, confirm that the size matches the wheel diameter, check inflation pressure, and inspect for proper seating on the rim. It is also smart to verify that nothing is contacting the tire at full steering lock or normal suspension travel.
A quick post-installation check can prevent bigger problems later. Look for even clearance at the inner wheelhouse and outer fender edge, make sure lug hardware is correct for the wheel being used, and recheck tire pressure after the first few drives as the tires settle into regular road use.
How often should tires on a 2021 Audi A5 Sportback be inspected?
Tires on a 2021 Audi A5 Sportback should be inspected regularly, not just when tread looks low. Pressure loss, uneven wear, cuts, bulges, and sidewall damage can all show up before a tire appears worn out, especially on low-profile fitments such as 245/40R18 and 255/35R19.
Monthly visual checks and pressure checks are a sensible routine, with closer inspection before longer trips or after pothole impacts. Cars that spend long periods parked still deserve attention, since age, flat spotting, or unnoticed air loss can affect road manners even when the vehicle is not driven often.
