The 2018 Audi A4 Quattro sits in the modern sport-sedan category where everyday refinement and all-weather confidence meet sharp road manners. In this generation, the A4 Quattro balanced premium comfort with the kind of wheel-and-tire packages that noticeably influence ride quality, appearance, and handling response. Tire fitment spans three primary radial sizes: 225/50R17, 245/40R18, and 245/35R19, depending on trim and wheel setup. That gives this car a meaningful choice between a taller 17-inch package and lower-profile 18- and 19-inch combinations, with available options ranging from blackwall performance radials to redline and raised white letter styles in 18-inch fitment. The key is matching the exact sub-model and wheel diameter before comparing tire series and sidewall presentation.
Which Tire Size Is Right for The 2018 Audi A4 Quattro
Three primary tire sizes apply to the 2018 Audi A4 Quattro, and they vary by sub-model and wheel diameter. The first step is confirming whether the car has 17-inch, 18-inch, or 19-inch wheels, then matching that setup to the correct trim fitment. Once the wheel diameter is confirmed, the decision shifts to choosing among the available radial tire lines, sidewall styles, and performance-oriented product options within the proper size.
225/50R17 is a modern metric radial size in which 225 identifies nominal section width in millimeters, 50 is the aspect ratio, R denotes radial construction, and 17 is the wheel diameter in inches. On the 2018 Audi A4 Quattro, this size represents the 17-inch fitment and keeps a relatively taller sidewall than the larger wheel packages. Available choices include BFGoodrich and Nitto blackwall radials across g-Force and NT555 G2 lines. This size is the right place to start when the car has 17-inch wheels and the goal is to stay with the original wheel diameter rather than move into lower-profile 18- or 19-inch fitment.
245/40R18 is a modern metric radial size, with 245 indicating nominal section width in millimeters, 40 representing the aspect ratio, radial construction marked by R, and an 18-inch rim requirement. For the 2018 Audi A4 Quattro, this is an important middle fitment that appears across more than one sub-model and bridges appearance and road-use priorities. Product choices span BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac, with blackwall, redline, and RWL sidewall treatments available in this size. It is the size to evaluate when the car carries 18-inch wheels and the buyer wants the widest spread of product-character and appearance options.
245/35R19 follows the same modern metric radial format, using a 245-millimeter nominal section width, a 35-series aspect ratio, radial construction, and a 19-inch wheel diameter. On the 2018 Audi A4 Quattro, this size serves the 19-inch setup and carries the lowest-profile presentation among the three primary fitments. Available selections include BFGoodrich and Nitto blackwall radials in several g-Force and NT555 G2 series options. This size should be chosen only when the car is equipped with 19-inch wheels, since the lower-profile construction is tied to that specific wheel diameter rather than the 17- or 18-inch packages.
Sub-model fitment matters on the 2018 Audi A4 Quattro because tire size changes with trim and wheel package. Confirming whether the car is a Premium, Premium Plus, or Prestige model helps narrow the correct wheel diameter before comparing tire choices.
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2018 Audi A4 Quattro Premium
The 2018 Audi A4 Quattro Premium uses either a 225/50R17 or 245/40R18 radial fitment, depending on the wheel setup on the car. That makes wheel-diameter confirmation especially important before choosing between available blackwall performance tires in the correct size.
The 2018 Audi A4 Quattro Premium Plus uses either 245/40R18 or 245/35R19 radial tires. Tire selection starts with confirming whether the car has 18-inch or 19-inch wheels, then comparing the available tire series and sidewall treatments within that fitment.
The 2018 Audi A4 Quattro Prestige also uses either 245/40R18 or 245/35R19 radial fitment. That means buyers should verify the actual wheel diameter on the vehicle first, especially if wheels have been changed, before selecting a tire line or sidewall style.
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 2018 Audi A4 Quattro Tires for Sale
Available 2018 Audi A4 Quattro tire options span 17-, 18-, and 19-inch radial fitments from BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac. Depending on size, the product grid includes multiple tire series and sidewall treatments, with blackwall choices throughout and redline or RWL options in 245/40R18.
The most common 2018 Audi A4 Quattro tire questions center on matching the correct size to the trim and wheel diameter, then comparing available radial options, sidewall styles, and practical fitment checks before road use.
Tire Size & Fitment
What tire size fits a 2018 Audi A4 Quattro?
The 2018 Audi A4 Quattro uses three primary radial tire sizes: 225/50R17, 245/40R18, and 245/35R19. The correct size depends on the car's trim and wheel diameter, since not every sub-model uses all three sizes. Premium models use 17-inch or 18-inch fitment, while Premium Plus and Prestige models use 18-inch or 19-inch fitment.
The practical first step is checking the actual wheels on the car rather than choosing by appearance alone. A4s that have changed hands may have different factory wheel packages or later wheel swaps, so confirming the installed rim diameter keeps the tire search focused on the proper size and profile.
What size rim does a 2018 Audi A4 Quattro use?
A 2018 Audi A4 Quattro can use 17-inch, 18-inch, or 19-inch rims, depending on sub-model and wheel package. The 225/50R17 size belongs to a 17-inch rim, 245/40R18 belongs to an 18-inch rim, and 245/35R19 belongs to a 19-inch rim. Each tire size is tied to its own wheel diameter and should be matched accordingly.
Rim diameter is the first fitment check because the tire bead must match the wheel exactly. It also helps to confirm wheel width before choosing among specific tire lines, especially on 18-inch and 19-inch fitments where product rim-width ranges can matter when comparing available radial options.
Do all 2018 Audi A4 Quattro sub-models use the same tire size?
No, all 2018 Audi A4 Quattro sub-models do not use the same tire size. The Premium uses 225/50R17 or 245/40R18, while the Premium Plus and Prestige use 245/40R18 or 245/35R19. The shared size across the higher trims is 245/40R18, but the 17-inch and 19-inch fitments are not universal across the range.
That difference matters because a tire search should start with the exact trim and the wheels currently on the car. Even within the same model year, an A4 Quattro with 17-inch wheels needs a different size than one equipped with 19-inch wheels, and that changes both sidewall profile and available tire choices.
Choosing the Right Tire
What should I consider when choosing a tire for a 2018 Audi A4 Quattro?
Start with the correct tire size for the car's trim and wheel diameter: 225/50R17, 245/40R18, or 245/35R19. From there, compare radial tire series, sidewall style, rim-width compatibility where stated, and load figures when they are given. The available product mix ranges from general street performance options to more specialized applications in some sizes.
The best comparison method is to match the tire to how the car is actually used. A daily-driven A4 Quattro may call for a different selection approach than a weekend car with a strong appearance focus, so wheel size, tire profile, and the specific character of each available series should all be weighed together.
What sidewall styles are available for 2018 Audi A4 Quattro tires?
Blackwall is available across all three primary 2018 Audi A4 Quattro sizes. In 245/40R18, there are also redline and RWL options, adding a more distinctive visual treatment than the standard blackwall choices. Those alternate sidewall styles appear within the Pro-Trac Street Pro III line for the 18-inch fitment.
Sidewall style is mostly an appearance decision once the correct size and wheel diameter are confirmed. A blackwall tire keeps a more understated modern look, while redline or raised white letter styling gives the 18-inch setup a more custom presentation without changing the basic requirement to stay within the proper 245/40R18 fitment.
What brands offer tires for the 2018 Audi A4 Quattro?
Tires for the 2018 Audi A4 Quattro are available from BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac, depending on the size. BFGoodrich and Nitto appear across all three fitments, while M&H Racemaster and Pro-Trac are part of the 245/40R18 selection. That gives the 18-inch size the broadest brand spread on this application.
Brand choice should still come after size confirmation, since not every brand appears in every fitment. Once the correct wheel diameter is established, the comparison becomes more useful because each brand's offerings can be evaluated by tire series, sidewall style, stated rim-width compatibility, and the intended character of the tire.
Restoration & Appearance
Which tire should I choose for a period-style 2018 Audi A4 Quattro?
A period-style approach on a 2018 Audi A4 Quattro usually starts by keeping the original wheel diameter and matching the proper tire size for that setup. That means 225/50R17, 245/40R18, or 245/35R19 depending on the car. Staying within the correct size preserves the visual balance Audi built into each wheel-and-tire package.
Appearance details then come from sidewall and series choice rather than changing to an unrelated fitment. Blackwall tires maintain the most restrained factory-era look, while 245/40R18 also offers redline and RWL options for a more customized presentation. For exact originality questions, vehicle-specific documentation remains the best guide.
How does tire construction affect the appearance of a restored 2018 Audi A4 Quattro?
On the 2018 Audi A4 Quattro, the primary fitments are all radial, so the appearance differences come more from wheel diameter, sidewall height, and sidewall treatment than from switching between bias-ply and radial construction. A 17-inch setup shows a taller sidewall, while 18-inch and 19-inch packages create a lower-profile, more contemporary stance.
That means the visual character of the car can change noticeably even when the overall tire diameter stays close across the three sizes. Choosing the correct wheel size first keeps the car aligned with its intended look, then sidewall style and tire series can fine-tune the result without moving outside the proper fitment family.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2018 Audi A4 Quattro?
Yes, modifications can affect tire fitment on a 2018 Audi A4 Quattro. Aftermarket wheels, suspension changes, altered ride height, or body modifications can all change the space available for a 225/50R17, 245/40R18, or 245/35R19 tire. Even when the size sounds familiar, the actual wheel dimensions and vehicle setup still matter.
A careful fitment check should include wheel diameter, wheel width, and clearance at full steering lock and suspension movement. That is especially important on lower-profile 18-inch and 19-inch combinations, where the car may be less forgiving of wheel offset changes than a stock setup on the original wheel package.
What should I inspect before driving a 2018 Audi A4 Quattro on new tires?
Before driving a 2018 Audi A4 Quattro on new tires, inspect the wheel diameter and tire size match, confirm proper inflation, and look over the wheels for damage or irregular seating. It also helps to check that the tires clear suspension and body components and that there are no visible cuts, bulges, or mounting issues after installation.
A short test drive should be followed by another visual inspection, especially if the car has different wheels than it left the factory with. Paying attention to vibration, rubbing, or unusual steering feel early can catch a sizing or installation issue before it turns into uneven wear or road-use trouble.
How often should tires on a 2018 Audi A4 Quattro be inspected?
Tires on a 2018 Audi A4 Quattro should be inspected regularly, not just when tread looks low. A quick check for pressure loss, sidewall damage, cuts, bulges, and uneven wear should be part of normal ownership, and a more thorough inspection is wise before longer trips or after any wheel, suspension, or alignment work.
Cars that are driven infrequently still need attention because time and storage conditions affect tires as much as mileage. An A4 Quattro that sits for long periods should have its tires checked for aging, flat spotting, and air loss before returning to regular road use, especially on lower-profile 18-inch or 19-inch fitments.
