2021 Audi A4 Quattro Tires

The 2021 Audi A4 Quattro uses three primary tire sizes: 225/50R17, 245/40R18, and 245/35R19. All three are radial sizes, and the correct one depends on the exact sub-model and wheel package on the car.

The most important step is confirming the actual wheel diameter before choosing a tire. A Premium, Premium Plus, or Prestige model may share one size with another trim or may use more than one fitment, so the safest approach is to match the tire size to the wheels currently on the vehicle rather than assuming every A4 Quattro uses the same setup.

A 2021 Audi A4 Quattro can use 17-inch, 18-inch, or 19-inch rims, depending on the tire size fitted to the car. The three matching primary combinations are 225/50R17 on a 17-inch rim, 245/40R18 on an 18-inch rim, and 245/35R19 on a 19-inch rim.

Rim diameter should be verified before comparing any tire options because the tire size must match the wheel exactly. Once the wheel diameter is confirmed, it becomes much easier to narrow the search by sub-model, tire series, and sidewall style without risking a mismatch between the tire and the existing wheel package.

The 2021 Audi A4 Quattro has more than one tire size because fitment varies by trim and wheel package. Some versions use a single size, while others can be equipped with either an 18-inch or 19-inch setup, and the Premium (201 hp) can also appear with a 17-inch or 18-inch fitment.

That means tire selection starts with identifying the exact sub-model and then checking the wheels on the car. Two A4 Quattro sedans from the same year can be correct with different sizes, so choosing by model name alone is not enough when the vehicle may have a different factory-style wheel package or a changed wheel setup.

Start with the correct primary size for the car: 225/50R17, 245/40R18, or 245/35R19. From there, compare radial construction details that matter to your use, including tire series, brand, sidewall style, and any stated rim-width or load specifications that apply to the exact product.

A daily-driven A4 Quattro may lead you toward one kind of tire character, while a more appearance-focused or enthusiast-driven car may point you toward another. It also helps to confirm whether the vehicle still has its original wheel diameter, because the right product choice only begins after the right size has been matched to the wheel.

Blackwall is the most common sidewall style across the available 2021 Audi A4 Quattro tire choices. In 245/40R18, there are also Pro-Trac Street Pro III options with redline and raised white letter sidewalls, which add a more customized visual treatment than a standard blackwall tire.

Sidewall style does not change the need to match the exact tire size and rim diameter first. Once the fitment is confirmed, the sidewall becomes an appearance decision that can shift the car toward a cleaner modern look or a more expressive performance-style presentation without changing the basic size requirement.

Tires for the 2021 Audi A4 Quattro are available from BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac across the covered fitments. Depending on size, the available series include g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, NT555 G2, Drag Radial, and Street Pro III.

The brand decision should come after the fitment decision, not before it. Some brands appear in more than one size, while others are tied to a narrower part of the range, so comparing by the exact tire size on the car will give a more useful picture than trying to choose a brand first and fitment second.

A period-style approach on a 2021 Audi A4 Quattro usually means staying with the car's correct original-size category and choosing a tire whose overall presentation suits a modern Audi sport sedan. In practice, that starts with matching 225/50R17, 245/40R18, or 245/35R19 to the wheel package already on the vehicle.

After the size is confirmed, appearance comes from details such as blackwall versus a more distinctive sidewall treatment in the available 245/40R18 range. For owners seeking exact as-delivered authenticity, vehicle-specific documentation and marque expertise are still worth consulting before treating any current tire brand or sidewall as a precise originality match.

On the 2021 Audi A4 Quattro, the primary fitments are all radial, so construction changes are less about bias-ply-versus-radial appearance and more about keeping the proper modern tire profile and wheel relationship intact. The visual difference usually comes from the exact size, sidewall treatment, and tire series rather than from a different construction family.

Keeping the correct rim diameter and size category preserves the car's intended stance far better than chasing appearance through an incorrect fitment. A 17-inch, 18-inch, or 19-inch setup gives the A4 Quattro a noticeably different presentation, so restoration-minded owners should verify the wheel package first and then choose the sidewall look that best suits the car.

Yes. Modifications such as aftermarket wheels, changed wheel widths, suspension lowering, or altered offsets can affect tire fitment on a 2021 Audi A4 Quattro even when the tire size sounds close to stock. That matters especially on a car that can already use 17-inch, 18-inch, or 19-inch wheel-and-tire combinations.

A modified A4 Quattro should be checked for wheel diameter, wheel width, clearance at full steering lock, and room around the fenders and suspension before settling on a tire. Using the correct listed size for a factory-style setup is only part of the process when the car's wheels or ride height no longer match its original configuration.

Before driving a 2021 Audi A4 Quattro on new tires, inspect the wheels for the correct diameter and condition, verify that the tire size matches the car's setup, and check for proper inflation. It also helps to confirm that there is no interference with fenders, suspension parts, or steering components.

A short initial road check is useful after installation to watch for vibration, pulling, or any sign of rubbing. Rechecking air pressure and visually confirming sidewall and tread condition after the first miles can catch setup problems early, especially if the car has aftermarket wheels or recently changed suspension components.

Before a longer drive, check that the 2021 Audi A4 Quattro is on the correct tire size for its wheels, confirm inflation, and inspect each tire for cuts, bulges, uneven wear, or damage. Any stored or lightly used car also deserves a close look for age-related cracking or slow air loss.

Longer trips put more importance on basic tire condition than a short local drive. It is smart to confirm that the wheel fasteners are properly torqued, the tread area is free of obvious damage, and the tires clear the body and suspension through normal steering travel, particularly if the car has non-original wheels or recent chassis changes.