The 2015 Audi A6 Quattro sits in the modern luxury sport-sedan class where all-weather drivability, precise road manners, and understated performance matter as much as comfort. In this generation, the A6 Quattro balanced executive-car refinement with the added traction and confidence that have long defined Audi’s Quattro reputation. Tire selection centers on three primary radial sizes: 245/45R18, 255/40R19, and 255/35R20, with fitment varying by trim level and wheel option. That gives owners a real choice between standard blackwall performance tires and, in some sizes, more distinctive sidewall treatments such as redline or raised white letter. The right decision starts with confirming the exact sub-model and wheel diameter already on the car.
Which Tire Size Is Right for The 2015 Audi A6 Quattro
The 2015 Audi A6 Quattro uses three primary tire sizes, and the correct one depends on the exact sub-model and wheel option. All three are radial metric sizes, but they mount on different rim diameters: 18, 19, or 20 inches. Before comparing tires, the first step is confirming the wheel diameter on the car, then matching that size to the correct trim or option package.
245/45R18 is a modern metric radial size in which 245 is the section width in millimeters, 45 is the aspect ratio, R identifies radial construction, and 18 is the rim diameter in inches. On the 2015 Audi A6 Quattro, this size suits 18-inch wheel applications and is the most widely shared fitment across several sub-models. Available choices center on blackwall radial performance tires from BFGoodrich and Nitto across series such as g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and NT555 G2. This size is the right place to start when the car retains its 18-inch wheel setup and an owner wants to compare series, load specifications, and intended road use.
Fit(s): Premium, Premium Plus (19 Inch Option), Prestige (19 Inch Option), TDI Premium Plus (19 Inch Option), and TDI Prestige (19 Inch Option)
Construction: Radial|Rim: 19 in
255/40R19 is a metric radial size that uses a 255-millimeter section width, a 40-series profile, and a 19-inch rim diameter. For the 2015 Audi A6 Quattro, this size applies to 19-inch wheel configurations, including certain trim-level options, so it should not be assumed across every version of the car. Product choices include blackwall offerings from BFGoodrich, plus Pro-Trac Street Pro III options with raised white letter or redline sidewall styling. This size deserves a closer look when the car is already equipped with 19-inch wheels and the owner wants either a conventional blackwall performance appearance or a more customized sidewall presentation.
Fit(s): Premium Plus (20 Inch Option), Prestige (20 Inch Option), TDI Premium Plus (20 Inch Option), and TDI Prestige (20 Inch Option)
Construction: Radial|Rim: 20 in
255/35R20 follows the same metric radial format, but with a lower 35-series profile and a 20-inch rim diameter. On the 2015 Audi A6 Quattro, it belongs to 20-inch wheel option fitments, making wheel confirmation especially important before selecting a tire. Available products include blackwall performance radials from BFGoodrich and Nitto, along with Pro-Trac Street Pro III choices in raised white letter and redline sidewall styles. This size is most relevant for owners maintaining the larger-wheel look already on the car and comparing tire series that match both the vehicle’s wheel setup and its intended driving use.
Tire fitment on the 2015 Audi A6 Quattro varies by trim level and, in several cases, by 19-inch or 20-inch wheel option. Checking the exact sub-model matters because the same trim name can appear with different wheel diameters and different corresponding tire sizes.
1
2015 Audi A6 Quattro Premium
The 2015 Audi A6 Quattro Premium can use either an 18-inch or 19-inch radial tire setup, so this trim requires an especially careful wheel check before replacement. Tire selection starts by matching the wheel diameter already on the car, then comparing the available product series and sidewall treatments in that exact size.
The 2015 Audi A6 Quattro Premium Plus uses the 18-inch radial fitment in its standard form. That makes the main decision less about size and more about choosing among the available blackwall performance tire series that suit the car’s present wheel setup and driving use.
2015 Audi A6 Quattro Premium Plus (19 Inch Option)
The 2015 Audi A6 Quattro Premium Plus (19 Inch Option) uses the 19-inch radial fitment rather than the standard 18-inch setup. That opens the door to both blackwall choices and more distinctive sidewall presentations, while still making wheel-diameter confirmation the first step before purchase.
2015 Audi A6 Quattro Premium Plus (20 Inch Option)
The 2015 Audi A6 Quattro Premium Plus (20 Inch Option) uses the 20-inch radial fitment associated with the larger factory-style wheel package. Tire selection here should focus on maintaining the correct 20-inch size while comparing product series and checking the actual wheel setup on the car.
The 2015 Audi A6 Quattro Prestige uses the 18-inch radial fitment in its standard configuration. For this sub-model, the practical choice is usually between available blackwall tire series, along with verifying wheel width and intended use before moving away from the existing setup.
The 2015 Audi A6 Quattro Prestige (19 Inch Option) moves to the 19-inch radial size tied to that wheel package. Owners should confirm that the car still carries its 19-inch wheels, then compare blackwall, redline, or raised white letter options depending on the desired appearance.
The 2015 Audi A6 Quattro Prestige (20 Inch Option) uses the 20-inch radial fitment matched to the larger wheel option. The key is keeping the correct size for that wheel diameter while evaluating available series and sidewall treatments that suit the car’s present look and use.
The 2015 Audi A6 Quattro TDI Premium Plus uses the 18-inch radial size in its standard configuration. Once the 18-inch wheel setup is confirmed, tire choice becomes a matter of comparing the available blackwall performance radials and selecting a series that matches the car’s driving role.
2015 Audi A6 Quattro TDI Premium Plus (19 Inch Option)
The 2015 Audi A6 Quattro TDI Premium Plus (19 Inch Option) uses the 19-inch radial fitment tied to that wheel option. Selection should begin with wheel confirmation, then move to product comparison among the available blackwall and more appearance-driven sidewall choices in that exact size.
2015 Audi A6 Quattro TDI Premium Plus (20 Inch Option)
The 2015 Audi A6 Quattro TDI Premium Plus (20 Inch Option) uses the 20-inch radial size rather than the standard 18-inch arrangement. Owners should verify that the car still has its correct 20-inch wheels before comparing the available performance-oriented tire series in this lower-profile fitment.
The 2015 Audi A6 Quattro TDI Prestige uses the 18-inch radial fitment in standard form. Tire selection is straightforward once wheel diameter is confirmed, with the main comparison centered on available blackwall series and their rim-width or load-related specifications.
2015 Audi A6 Quattro TDI Prestige (19 Inch Option)
The 2015 Audi A6 Quattro TDI Prestige (19 Inch Option) uses the 19-inch radial size matched to that larger wheel package. The important step is confirming the actual wheel diameter on the car, then selecting among blackwall, redline, or raised white letter offerings in the correct size.
2015 Audi A6 Quattro TDI Prestige (20 Inch Option)
The 2015 Audi A6 Quattro TDI Prestige (20 Inch Option) uses the 20-inch radial fitment associated with the largest wheel option. Replacement selection should stay centered on the existing 20-inch setup, with attention to tire series, appearance choice, and wheel compatibility.
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 2015 Audi A6 Quattro Tires for Sale
Available 2015 Audi A6 Quattro tires span 18-, 19-, and 20-inch radial fitments from BFGoodrich, Nitto, and Pro-Trac. Buyers can compare blackwall performance series such as g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, NT555 G2, and Street Pro III, with redline and raised white letter options in select sizes.
Owners of a 2015 Audi A6 Quattro usually need to sort out the correct tire size by trim level and wheel option first. From there, the most important questions involve rim diameter, sidewall style, product selection, and checks to make before road use.
Tire Size & Fitment
What tire size fits a 2015 Audi A6 Quattro?
The 2015 Audi A6 Quattro uses three primary tire sizes: 245/45R18, 255/40R19, and 255/35R20. All three are radial fitments, and the correct size depends on the exact sub-model and whether the car has its standard wheel package or a 19-inch or 20-inch option.
The most important step is matching the tire to the wheel diameter already on the car. A Premium, Prestige, or TDI trim may appear with different wheel options, so checking the actual sub-model designation and current wheels prevents ordering the right type of tire in the wrong size.
What size rim does a 2015 Audi A6 Quattro use?
A 2015 Audi A6 Quattro can use 18-inch, 19-inch, or 20-inch rims, depending on trim level and wheel option. The corresponding tire sizes are 245/45R18 for 18-inch rims, 255/40R19 for 19-inch rims, and 255/35R20 for 20-inch rims.
Since this car spans three rim diameters, wheel confirmation comes before any product comparison. Looking only at the model year and trim name is not always enough, especially when option packages or wheel changes are involved, so it helps to verify the tire sidewall marking and the wheel itself before replacement.
Do all 2015 Audi A6 Quattro sub-models use the same tire size?
No, 2015 Audi A6 Quattro sub-models do not all use the same tire size. Some standard Premium, Premium Plus, Prestige, and TDI versions use 245/45R18, while 19-inch and 20-inch option versions move to 255/40R19 or 255/35R20.
That variation means trim name alone is only part of the answer. A car may share the same basic sub-model name but carry a different wheel package, so tire selection should follow the exact sub-model description and the wheel diameter presently fitted to the vehicle.
Choosing the Right Tire
What should I consider when choosing a tire for a 2015 Audi A6 Quattro?
Start with the correct size for the car’s wheel setup: 245/45R18, 255/40R19, or 255/35R20. Once size is settled, compare the available radial tire series, sidewall style, rim-width compatibility where stated, and any load figures tied to inflation pressure.
A6 Quattro owners often balance appearance, driving style, and existing wheel equipment rather than size alone. A standard 18-inch setup calls for a different comparison than a 19-inch or 20-inch option car, so the most useful next step is narrowing choices by wheel diameter and how the vehicle is actually used.
What sidewall styles are available for 2015 Audi A6 Quattro tires?
Sidewall style depends on tire size. Blackwall choices are available across all three primary sizes, while 255/40R19 and 255/35R20 also include Pro-Trac Street Pro III options in RWL, or raised white letter, and redline sidewall treatments.
That gives the 19-inch and 20-inch fitments a broader appearance range than the 18-inch size. Buyers who want a cleaner modern presentation may stay with blackwall, while those aiming for a more customized look should still confirm the correct wheel diameter first so style selection does not override basic fitment.
What brands offer tires for the 2015 Audi A6 Quattro?
Tires for the 2015 Audi A6 Quattro are available from BFGoodrich, Nitto, and Pro-Trac, depending on size. BFGoodrich appears across all three primary sizes, Nitto is offered in 245/45R18 and 255/35R20, and Pro-Trac appears in the 255/40R19 and 255/35R20 fitments.
Brand choice is only one part of the decision. It makes more sense to compare each brand within the exact tire size already on the car, then look at series differences, sidewall treatment, and wheel-width compatibility rather than assuming every brand offers the same type of tire in every A6 Quattro fitment.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2015 Audi A6 Quattro?
Yes, modifications can affect tire fitment on a 2015 Audi A6 Quattro. Aftermarket wheels, suspension changes, altered ride height, or previous plus-sizing can change the wheel width, diameter, and available clearance even when the car still appears to use one of the standard A6 Quattro tire sizes.
Checking the tire sidewall alone is not always enough on a modified car. It helps to confirm the actual wheel diameter and width, then inspect inner clearance, fender clearance, and steering travel before replacing tires, especially on 19-inch and 20-inch setups where appearance changes are more common.
What should I inspect before driving a 2015 Audi A6 Quattro on new tires?
Before driving a 2015 Audi A6 Quattro on new tires, inspect wheel condition, verify air pressure, and make sure the installed tire size matches the vehicle’s actual wheel diameter. It is also wise to look for any rubbing risk at the fenders or inner suspension areas once the tires are mounted.
A short check after installation can prevent avoidable problems. Pay attention to steering clearance, unusual vibration, and any sign of contact during full-lock turns, and keep an eye on pressure stability during the first several drives so the new tires start out on the car with the correct fitment and condition.
How often should tires on a 2015 Audi A6 Quattro be inspected?
Tires on a 2015 Audi A6 Quattro should be inspected regularly for tread wear, cuts, bulges, cracking, and air loss, especially if the car sees seasonal use or extended parking. Low-profile 19-inch and 20-inch fitments deserve extra attention because cosmetic wheel damage and clearance issues can be easier to miss.
A quick visual check before longer drives is a good habit, and a more careful inspection helps after pothole impact, wheel service, or suspension work. Looking at both tire condition and wheel condition together is especially useful on this model because its fitment can vary significantly by trim and wheel package.
