2010 Audi S4 Tires

A 2010 Audi S4 uses either 245/40R18 or 255/35R19 radial tires. The Premium Plus can use either size depending on wheel setup, while the Prestige uses 255/35R19. Both are low-profile modern metric radial sizes, but they are built for different wheel diameters and should be treated as separate fitments rather than interchangeable choices.

The first thing to verify is the wheel diameter actually on the car, because the 18-inch and 19-inch fitments are not selected the same way. A car with factory-style wheels, aftermarket wheels, or a changed trim appearance can easily create confusion, so checking the wheel itself before choosing a tire avoids ordering the correct size for the wrong setup.

The 2010 Audi S4 uses either an 18-inch rim with 245/40R18 tires or a 19-inch rim with 255/35R19 tires. Those are the two wheel diameters tied to the vehicle's primary tire fitments. The correct answer depends on the sub-model and, just as importantly, the actual wheel package installed on the car today.

Rim diameter is the non-negotiable part of tire fitment, so it should be confirmed before comparing brands or tread styles. Wheel width matters too once the size is narrowed down, especially on a performance sedan like the S4 where low-profile tires are sensitive to wheel sizing. Checking both the wheel diameter and the current wheel width helps keep the selection process on track.

The 2010 Audi S4 has more than one tire size because different covered configurations use different wheel diameters. One setup uses 245/40R18 on an 18-inch rim, and another uses 255/35R19 on a 19-inch rim. That means the tire choice is tied to the wheel package rather than being a simple one-size-fits-all replacement across the model range.

That difference matters because low-profile tires are closely matched to their intended wheel diameter and width. A buyer should identify the exact sub-model, then confirm what wheels are actually on the car, especially if it has changed hands or been modified. Once that is clear, comparing performance-oriented product options within the correct size becomes much easier.

Start with the correct size for the car's actual wheel diameter, then compare construction, rim-width compatibility, load figures where stated, and the type of driving the tire is intended to support. The 2010 Audi S4 uses radial tires in either 245/40R18 or 255/35R19, so the choice is not about converting from vintage construction but about matching the right modern performance tire to the correct wheel setup.

From there, the real differences are in tire series, brand, sidewall presentation, and specialty use. Some 18-inch options lean toward street performance, while one M&H Racemaster product is geared toward drag race use. Looking at how the car is driven, how much styling matters, and whether the wheel width matches the tire's intended range will usually narrow the field quickly.

Blackwall is the most common sidewall style available for the 2010 Audi S4, and it appears across both primary tire sizes. In 245/40R18, there are also redline and RWL options in the Pro-Trac Street Pro III series. That gives the 18-inch fitment a wider appearance range than the 19-inch setup, which stays focused on blackwall performance tires.

Sidewall style mainly affects presentation, but it can shape the character of the car visually. A blackwall keeps a clean modern look, while redline or raised white letter sidewalls add a more customized appearance. Choosing among them still comes after confirming the correct size, since sidewall treatment never overrides wheel diameter, width, or overall fitment needs.

Tires for the 2010 Audi S4 are available from BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac across the covered sizes. BFGoodrich appears in both 18-inch and 19-inch fitments, while Nitto, M&H Racemaster, and Pro-Trac appear in the 245/40R18 size. The available products are all radial tires, but they differ in series focus and sidewall style.

Brand choice should be weighed alongside the exact tire series and intended use rather than treated as a decision by itself. One owner may want a blackwall street performance tire, while another may be looking for a redline or raised white letter look on 18-inch wheels. Checking wheel size first keeps the brand comparison tied to the options that actually fit the car.

A period-style 2010 Audi S4 still starts with the correct modern radial size for the car's wheel setup, either 245/40R18 or 255/35R19. Since this is a late-model sport sedan rather than a mid-century collector car, the visual question is usually less about vintage construction and more about keeping the wheel-and-tire presentation in line with the car's original-era look.

For most owners, that means staying with a blackwall performance radial in the proper size and profile. An 18-inch setup opens the door to more expressive sidewall styling, but a restoration-oriented buyer will usually want to compare those choices carefully against period photos, original sales material, or marque-specific references before making appearance a deciding factor.

Tire construction has less visual effect on a restored 2010 Audi S4 than it would on an older collector vehicle because the primary fitments are already modern radial sizes. The bigger appearance factors here are wheel diameter, sidewall profile, and sidewall styling. On this car, the distinction is not bias-ply versus radial but rather which radial size and presentation best suit the intended look.

A 245/40R18 setup with blackwall, redline, or raised white letter options can change the visual tone of the car more noticeably than construction itself. The 255/35R19 fitment stays closer to a contemporary performance appearance. Keeping the proportions consistent with the wheel package is usually the most important restoration-minded choice on a B8 S4.

Yes, modifications can affect tire fitment on a 2010 Audi S4 even when the tire size sounds correct on paper. Aftermarket wheels, changes in wheel width or offset, lowered suspension, and brake upgrades can all alter how a 245/40R18 or 255/35R19 tire sits in the wheelwell. That is especially important on a low-profile performance fitment where clearance margins can be tighter.

A modified car should be checked at full steering lock and through normal suspension travel before assuming any tire choice is suitable. The owner should confirm actual wheel diameter and width first, then look for potential clearance issues at the fender, inner liner, and suspension side. That extra step matters more than relying on trim level alone once the car has been changed.

Before driving a 2010 Audi S4 on new tires, inspect the wheel size, wheel condition, valve stems, and tire pressure, then confirm the tires match the intended 18-inch or 19-inch setup. It also makes sense to look at alignment-related wear on the old tires, because uneven wear can point to suspension or alignment issues that should be corrected before the new set is put into regular use.

A short visual check after installation is worthwhile as well. Make sure there is no rubbing at full steering lock, listen for any contact over driveway entrances or bumps, and recheck inflation after the first few drives. On a performance sedan like the S4, proper setup matters just as much as choosing the right size in the first place.

Before a longer drive in a 2010 Audi S4, check tire pressure, tread condition, and the sidewalls for cuts, bulges, or cracking. Confirm that all four tires are the correct size for the wheel setup and that there is no unusual wear pattern suggesting alignment or suspension trouble. A longer trip puts sustained heat and load into the tires, so condition matters as much as size.

It is also smart to verify that lug hardware is properly torqued and that the wheels are free of visible damage. Any recent wheel change, suspension work, or tire installation makes a cautious recheck even more important. Catching a pressure issue, vibration source, or clearance problem before departure is far easier than dealing with it on the road.