The 2013 Audi S4 sits in the modern sport-sedan sweet spot, combining understated Audi styling with the kind of all-weather, all-around performance that makes this generation especially appealing to enthusiasts. It is a car that rewards careful setup, and tire choice plays a major role in how it looks, rides, and responds. This S4 uses radial tires in two primary fitments, 245/40R18 and 255/35R19, depending on wheel diameter. Available choices range from blackwall performance radials to Redline and RWL options in 18-inch form. The key is confirming whether the car is on 18-inch or 19-inch wheels before choosing the tire that suits its road use and appearance.
Which Tire Size Is Right for The 2013 Audi S4
The 2013 Audi S4 uses two primary tire sizes, and the first step is confirming whether the car is on 18-inch or 19-inch wheels. Both fitments are radial, and the Base model can use either size, so wheel diameter matters more than trim name. Once that is settled, the decision becomes choosing the right tire series, sidewall style, and performance character within the correct size.
245/40R18 is a modern metric radial size: 245 is the section width in millimeters, 40 is the aspect ratio, R identifies radial construction, and 18 is the wheel diameter in inches. On the 2013 Audi S4, this size suits the 18-inch wheel setup and keeps the car in a modern low-profile performance format. Available choices include BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac, with blackwall, Redline, and RWL sidewall treatments depending on the tire series. This size is the right place to start when the car is on 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 section width, a 35-series profile, radial construction, and a 19-inch rim diameter. For the 2013 Audi S4, it belongs to the 19-inch wheel setup and gives the car a slightly wider, lower-profile tire format than the 18-inch fitment. Available products in this size come from BFGoodrich and focus on blackwall performance radial lines such as g-Force Comp 2 AS, g-Force Sport Comp 2, and g-Force Phenom T/A. This fitment makes sense when the S4 is already equipped with 19-inch wheels and you want to stay within that wheel-and-tire package.
Sub-model fitment is straightforward here because the 2013 Audi S4 Base uses the same two primary tire-size paths tied to wheel diameter. The real fitment question is not trim level, but whether the car is wearing 18-inch or 19-inch wheels before a tire is selected.
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2013 Audi S4 Base
The 2013 Audi S4 Base can use either of the two radial tire fitments offered for this model year, depending on which wheel diameter is on the car. That makes wheel confirmation the key step, followed by choosing the tire series and sidewall style that match the car's intended use and overall presentation.
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 2013 Audi S4 Tires for Sale
Available 2013 Audi S4 tire choices center on modern radial performance lines from BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac. Depending on size, buyers can compare blackwall options along with Redline and RWL treatments in 245/40R18, plus differences in tire series and rim-width compatibility.
These 2013 Audi S4 tire FAQs focus on the two correct sizes, 18-inch versus 19-inch wheel fitment, available radial choices, sidewall and brand differences, and the maintenance checks that matter before regular road use.
Tire Size & Fitment
What tire size fits a 2013 Audi S4?
The 2013 Audi S4 uses two primary tire sizes: 245/40R18 and 255/35R19. Both are radial fitments, and the Base model can use either one depending on the wheel package installed on the car.
The important step is matching the tire to the actual wheel diameter on the vehicle rather than assuming one size fits every S4. Check the wheel itself and the tire sidewall currently on the car, especially if it has been changed from its earlier setup, because 18-inch and 19-inch fitments are not interchangeable.
What size rim does a 2013 Audi S4 use?
A 2013 Audi S4 uses either an 18-inch or 19-inch rim, depending on which tire size is on the car. The 245/40R18 fitment belongs on an 18-inch wheel, while the 255/35R19 fitment belongs on a 19-inch wheel.
That means rim diameter has to be confirmed before choosing a tire. Tire size and wheel diameter work as a matched set, so a 19-inch tire cannot be mounted on an 18-inch wheel, and an 18-inch tire cannot be mounted on a 19-inch wheel. If the car has aftermarket wheels, verify width and clearance as well.
Why does the 2013 Audi S4 have more than one tire size?
The 2013 Audi S4 has more than one tire size because it was fitted with two wheel-diameter setups: 245/40R18 on 18-inch wheels and 255/35R19 on 19-inch wheels. Both sizes apply to the S4 Base, so the difference comes from wheel package rather than a separate trim path.
This matters because the correct tire choice depends on the wheel currently on the car. An S4 that has been changed over to a different factory-style wheel size, or fitted with aftermarket wheels, may no longer match what another 2013 S4 uses. Checking the actual wheel and current tire markings avoids ordering the wrong size.
Choosing the Right Tire
What should I consider when choosing a 245/40R18 or 255/35R19 tire for a 2013 Audi S4?
Start with the correct size for the wheel diameter on the car, then compare the tire's construction, series, sidewall style, and rim-width specification. On the 2013 Audi S4, both fitments are radial, but the available product mix differs between the 18-inch and 19-inch sizes.
The 18-inch size offers a broader mix that includes blackwall, Redline, and RWL choices, while the 19-inch size stays focused on blackwall performance radials. It also helps to compare load figures where shown, tire weight, and intended use, especially if the car is driven spiritedly or has been fitted with non-stock wheels.
What sidewall styles are available for 2013 Audi S4 tires?
Sidewall style depends on the tire size and product line. For the 2013 Audi S4, blackwall is available in both primary sizes, while Redline and RWL options appear in the 245/40R18 fitment through the Pro-Trac Street Pro III line.
That means appearance choice is broader if the car is on 18-inch wheels. Blackwall usually keeps the look closer to a contemporary performance-sedan presentation, while Redline or raised white letter styling changes the visual character of the car. Matching the sidewall treatment to the wheel setup helps the finished package look intentional.
What brands offer tires for the 2013 Audi S4?
Tires for the 2013 Audi S4 are available from BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac, depending on size. BFGoodrich appears in both 245/40R18 and 255/35R19, while Nitto, M&H Racemaster, and Pro-Trac appear in the 18-inch fitment.
Brand choice should be considered alongside the actual tire series and the car's intended use. Some options are clearly performance-street oriented, one is aimed at drag race use, and others add a stronger visual statement through sidewall styling. Choosing by size first, then by series character, keeps the comparison practical.
Restoration & Appearance
Which tire should I choose for a period-style 2013 Audi S4?
A period-style 2013 Audi S4 tire choice usually starts with keeping the correct modern low-profile radial size for the wheel diameter already on the car. From there, the look can stay contemporary with blackwall performance tires, or shift toward a more custom presentation in 245/40R18 with Redline or RWL sidewall options.
Because this is a modern performance sedan rather than an earlier restoration-era car, appearance usually comes down to preserving the car's original visual balance rather than chasing a vintage tire style. Keeping the wheel diameter and overall tire format appropriate to the S4 matters more than adding visual flair that fights the car's design.
How does tire construction affect the appearance of a restored 2013 Audi S4?
On a 2013 Audi S4, construction does not create a bias-ply versus radial appearance choice because the primary fitments are radial. The visible difference comes more from sidewall styling, tread character, and whether the car is set up on 18-inch or 19-inch wheels.
That makes the tire's visual role more subtle than it would be on an older collector car. A blackwall radial tends to preserve the S4's clean sport-sedan look, while Redline or RWL options in 245/40R18 create a more customized presentation. Staying within the correct size keeps the car's proportions closer to what suits the chassis.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2013 Audi S4?
Yes. A 2013 Audi S4 can use either 18-inch or 19-inch tire fitments, so wheel changes, suspension lowering, spacer use, or aftermarket wheel widths can all affect which tire setup works properly. Even when the size code looks correct, the full wheel-and-tire package still needs to suit the car.
Clearance at the fender, inner wheelhouse, and steering range should be checked any time the car has been modified. It is also smart to confirm wheel width against the tire's intended mounting range, especially on performance-oriented setups, because a changed wheel can alter how the tire sits and behaves.
What should I inspect before driving a 2013 Audi S4 on new tires?
Before driving a 2013 Audi S4 on new tires, check that the tire size matches the wheel diameter, verify air pressure, and inspect for proper mounting and bead seating. It also helps to confirm that all four tires match the intended setup and that there is no visible rubbing at rest.
A short, careful drive is useful for checking steering feel, vibration, and any contact under turning or suspension movement. Looking over the wheels for damage, checking alignment condition, and rechecking pressure after initial use are sensible steps as well, particularly on a performance sedan where tire setup has a noticeable effect on handling.
How often should tires on a 2013 Audi S4 be inspected?
Tires on a 2013 Audi S4 should be inspected regularly, not only when tread looks worn. A quick visual check before routine driving and a more thorough inspection at service intervals can help catch uneven wear, punctures, sidewall damage, and pressure loss before they become larger problems.
Performance-oriented tire sizes can react quickly to alignment issues and low pressure, so paying attention to shoulder wear and unusual handling is worthwhile. Cars that sit for longer periods also deserve inspection for flat spotting, aging, or cracking. Keeping pressures correct and rotating attention between front and rear condition helps preserve consistent road manners.
