The 2015 Audi A8 Quattro sits at the top of Audi’s full-size luxury sedan range, blending all-wheel-drive confidence with the understated design and high-speed composure that defined the modern A8. Buyers looking at this exact car are usually balancing originality, ride quality, and wheel-package accuracy rather than searching for a broad one-size-fits-all answer. Tire fitment centers on two radial sizes, 255/45R19 and 265/40R20, depending on the specific sub-model and wheel setup. That makes wheel diameter the first checkpoint before anything else. Once that is confirmed, the decision becomes choosing the correct modern radial size for the car’s exact configuration and intended road use.
Which Tire Size Is Right for The 2015 Audi A8 Quattro
The 2015 Audi A8 Quattro uses two primary tire sizes, and the difference comes down to sub-model and wheel diameter. Some versions use 255/45R19 on a 19-inch rim, while others use 265/40R20 on a 20-inch rim, so the first step is confirming the exact sub-model and the wheels currently on the car before selecting a tire.
Fit(s): (20 Inch Option), L (20 Inch Option), L TDI, and L W12
Construction: Radial|Rim: 20 in
265/40R20 is a modern metric radial size in which 265 identifies nominal section width in millimeters, 40 is the aspect ratio, R designates radial construction, and 20 is the wheel diameter in inches. On the 2015 Audi A8 Quattro, this size belongs to configurations equipped with the 20-inch wheel package rather than every version of the model. Its lower-profile format gives this fitment a distinctly wheel-specific character, so the key step is confirming that the car actually has the correct 20-inch rim setup before choosing a replacement tire.
255/45R19 is a modern metric radial size, with 255 representing nominal section width in millimeters, 45 indicating the aspect ratio, R marking radial construction, and 19 identifying the wheel diameter in inches. This size applies to several 2015 Audi A8 Quattro configurations, including Base and L models, and it remains separate from the optional 20-inch wheel fitment. For buyers, the main consideration is matching the tire to the car’s actual 19-inch wheel package rather than assuming every A8 Quattro in this model year uses the same size.
Sub-model fitment matters on the 2015 Audi A8 Quattro because tire size changes with wheel-package configuration. Some versions stay with one size, while others were offered with either 19-inch or 20-inch fitment, so the exact sub-model and wheel diameter should be confirmed before replacing tires.
1
2015 Audi A8 Quattro (20 Inch Option)
The 2015 Audi A8 Quattro (20 Inch Option) uses the 265/40R20 radial size tied to the 20-inch wheel package. Tire selection starts with confirming that the car still carries the proper 20-inch wheels and has not been changed to a different setup over time.
The 2015 Audi A8 Quattro Base uses the 255/45R19 radial size on a 19-inch wheel setup. For replacement, the goal is to stay with the correct 19-inch fitment unless the car has been intentionally converted to a different wheel and tire package.
The 2015 Audi A8 Quattro L uses 255/45R19 in its standard 19-inch configuration. That makes tire choice fairly straightforward, provided the car still wears the intended wheel diameter and has not been altered with aftermarket wheels.
The 2015 Audi A8 Quattro L (20 Inch Option) moves to the 265/40R20 radial size with the larger wheel package. Buyers should verify the actual wheel diameter on the car first, since the long-wheelbase A8 L also appeared in a 19-inch configuration.
The 2015 Audi A8 Quattro L TDI can use either 255/45R19 or 265/40R20 depending on the wheel package installed on the car. That makes visual confirmation of the current rim diameter essential before choosing a tire, even when the sub-model is already known.
The 2015 Audi A8 Quattro L W12 also appears with either 255/45R19 or 265/40R20, so the wheel package determines the correct tire size. Replacement selection should begin with the actual wheels on the vehicle rather than relying on the model name alone.
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.
Frequently Asked Questions
Owners of a 2015 Audi A8 Quattro usually need clarity on the correct tire size, 19-inch versus 20-inch wheel fitment, and how sub-models affect that choice. The questions below focus on exact size selection, wheel confirmation, tire choice, and practical road-use checks.
Tire Size & Fitment
What tire size fits a 2015 Audi A8 Quattro?
A 2015 Audi A8 Quattro uses either 255/45R19 or 265/40R20, depending on the specific sub-model and wheel package. Base and A8 L configurations commonly use 255/45R19, while 20-inch option models use 265/40R20. The A8 L TDI and A8 L W12 can appear with either size.
The important next step is confirming the wheels actually on the car today. A used A8 may have been changed from its original wheel package, and that matters because these sizes use different rim diameters. Matching the tire to the installed 19-inch or 20-inch wheel is more important than relying on the badge alone.
What size rim does a 2015 Audi A8 Quattro use?
The 2015 Audi A8 Quattro uses either a 19-inch or 20-inch rim, depending on the tire size fitted to the vehicle. A 255/45R19 tire belongs on a 19-inch wheel, while a 265/40R20 tire belongs on a 20-inch wheel. Both fitments are radial constructions.
Rim diameter should be checked before ordering tires, especially on cars that have changed hands or received aftermarket wheels. Reading the current tire size is helpful, but confirming the wheel itself avoids mistakes. Once the rim diameter is verified, the remaining decision is choosing the correct tire within that size for the exact A8 configuration.
Do all 2015 Audi A8 Quattro sub-models use the same tire size?
No, 2015 Audi A8 Quattro sub-models do not all use the same tire size. Some use 255/45R19, some use 265/40R20, and certain versions such as the A8 Quattro L TDI and A8 Quattro L W12 can be found with either size depending on wheel-package configuration.
That variation means the sub-model name is only part of the answer. Cars with optional 20-inch wheels require a different tire than those with 19-inch wheels, even within the same A8 family. Checking both the exact trim and the actual wheel diameter on the vehicle helps prevent ordering a tire that matches the model line but not the car.
Choosing the Right Tire
What should I consider when choosing a 255/45R19 or 265/40R20 tire for a 2015 Audi A8 Quattro?
Start with the exact size that belongs on the car’s current wheel package. A 2015 Audi A8 Quattro uses either 255/45R19 or 265/40R20, so the right choice begins with confirming whether the car has 19-inch or 20-inch wheels rather than choosing by appearance alone.
After size is settled, focus on the kind of driving the car sees and whether the goal is everyday road use or a more appearance-conscious replacement. Tire dimensions, wheel compatibility, and overall clearance should all stay aligned with the existing setup. That approach keeps the A8’s fitment consistent and avoids problems created by choosing a tire only by width or profile.
How do I choose between the available 2015 Audi A8 Quattro tire sizes?
The two sizes are not alternatives for the same wheel. A 255/45R19 is for a 19-inch setup, and a 265/40R20 is for a 20-inch setup, so the correct choice depends on the wheel package actually installed on the 2015 Audi A8 Quattro. The car should stay with the size matched to its wheel diameter.
Sub-model naming helps narrow the fitment, but the final check should still be the wheels on the car. This is especially important on long-wheelbase versions that appeared with more than one tire size. Looking at the current tire sidewall and measuring wheel diameter gives a more reliable starting point than assuming all A8 Quattro sedans were equipped the same way.
What rim-fitment details should I compare when choosing 2015 Audi A8 Quattro tires?
The most important rim-fitment detail is diameter. On a 2015 Audi A8 Quattro, 255/45R19 requires a 19-inch wheel and 265/40R20 requires a 20-inch wheel. Those sizes also differ in section width and profile, so they should be treated as wheel-specific fitments rather than mixed casually.
Wheel width, offset, and any aftermarket changes deserve a look before replacing tires, particularly if the car no longer has its original wheel package. Tire-to-suspension and tire-to-fender clearance should remain consistent with the setup already in use. A careful check is worthwhile on luxury sedans like the A8, where small fitment changes can affect both appearance and everyday drivability.
Restoration & Appearance
Does correct tire fitment matter for a 2015 Audi A8 Quattro restoration or preservation project?
Yes, correct tire fitment matters on a 2015 Audi A8 Quattro because the car’s appearance and stance are closely tied to its wheel package. A preservation-minded replacement should keep the correct 255/45R19 or 265/40R20 size for the specific configuration rather than substituting a different diameter simply because it seems close.
Modern collector-era luxury sedans are especially sensitive to wheel and tire proportion. Keeping the proper size helps preserve the car’s intended visual balance and avoids an obviously mismatched look. For owners pursuing highly exact presentation, the right next step is comparing the existing wheels and trim-specific setup before making any tire change.
Which tire size should I choose for a period-appropriate 2015 Audi A8 Quattro appearance?
A period-appropriate look starts with the tire size that belongs to the car’s actual wheel package. On a 2015 Audi A8 Quattro, that means 255/45R19 for 19-inch configurations or 265/40R20 for 20-inch option setups. Keeping the correct diameter and profile relationship does more for the car’s visual character than chasing a different size.
The A8’s styling depends on clean proportions, so an incorrect sidewall height or wheel diameter can make the car look noticeably off. Owners preserving the original presentation should verify the sub-model and installed wheels first, then choose a replacement within the proper size. That keeps the finished result closer to the car’s intended luxury-sedan presence.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2015 Audi A8 Quattro?
Yes, modifications can affect tire fitment on a 2015 Audi A8 Quattro. Aftermarket wheels, changes in offset, suspension lowering, or non-original wheel diameters can all alter the relationship between the tire and the fenders, steering components, and suspension. That matters whether the car is using 255/45R19 or 265/40R20.
A tire that matches the model year and sub-model may still be wrong for a car that has been altered. Checking wheel diameter, width, and clearance at full steering lock is a smart step before replacement. That is especially important on a large luxury sedan, where even small changes in fitment can affect ride quality and everyday drivability.
What should I inspect before driving a 2015 Audi A8 Quattro on new tires?
Before driving a 2015 Audi A8 Quattro on new tires, check that the installed size matches the wheel diameter, that inflation pressure is set correctly for the tire and vehicle, and that there is no visible interference with suspension or bodywork. Lug hardware and general wheel condition also deserve attention before regular road use.
A short initial drive followed by another visual inspection is a sensible habit. Look for any rubbing marks, uneven seating, or unexpected air loss after the first miles. On a vehicle like the A8 Quattro, it is also worth confirming that all four tires match the intended setup so the car’s handling and all-wheel-drive system are working with a consistent fitment.
How often should tires on a 2015 Audi A8 Quattro be inspected?
Tires on a 2015 Audi A8 Quattro should be inspected regularly, not just when tread looks worn. Pressure, tread condition, sidewall cracking, bulges, cuts, and uneven wear are all worth checking, especially on a luxury car that may spend periods parked between longer drives. Regular visual checks help catch issues before they become expensive problems.
A monthly inspection is a practical routine, with an additional check before road trips or after the car has been stored. Tires can age even when mileage stays low, so condition matters as much as tread depth. Keeping the correct 19-inch or 20-inch fitment in good shape supports proper ride quality, clearance, and overall road manners.
