The 2009 Audi A8 Quattro sits in the final years of Audi’s aluminum-intensive D3 luxury sedan, a car known for blending all-wheel-drive confidence with understated high-speed touring character. Buyers looking at this exact model are usually balancing luxury-car road manners, wheel appearance, and the realities of a modern performance-oriented tire fitment. The 2009 Audi A8 Quattro uses radial tire sizes 255/45R18, 255/40R19, and 275/35R20, so the first decision is confirming which wheel diameter is on the car. From there, choices include blackwall, raised white letter, and redline styles across several radial series. That makes this page less about finding any tire and more about matching the car’s wheel setup, intended look, and road use.
Which Tire Size Is Right for The 2009 Audi A8 Quattro
Three tire sizes apply to the 2009 Audi A8 Quattro, and the difference comes down primarily to wheel diameter rather than separate sub-model fitment. All three sub-models can use 18-inch, 19-inch, or 20-inch wheel-and-tire combinations, so the first step is confirming the actual wheels on the car. Once that is settled, the decision shifts to tread style, sidewall treatment, tire series, and the overall look you want from a radial performance tire.
255/40R19 is a modern metric radial size in which 255 identifies the nominal section width in millimeters, 40 is the aspect ratio, R indicates radial construction, and 19 is the wheel diameter in inches. On the 2009 Audi A8 Quattro, this size suits a 19-inch wheel setup and keeps the fitment in a contemporary performance-oriented radial format. Available choices include BFGoodrich and Pro-Trac tires, with blackwall, raised white letter, and redline sidewall treatments across g-Force and Street Pro III series. This size is worth evaluating when the car already wears 19-inch wheels and you want both proper diameter matching and some flexibility in visual style.
255/45R18 follows the same metric radial format, with a 255-millimeter nominal section width, a 45-series profile, radial construction, and an 18-inch rim diameter. For the 2009 Audi A8 Quattro, it represents the 18-inch fitment and stays very close in overall diameter to the 19-inch alternative while using a different wheel size. Product choices include BFGoodrich, Nitto, and Pro-Trac, with blackwall, raised white letter, and redline options available in several tire series. It is the right size to consider when the car is on 18-inch wheels and the goal is matching that wheel package without moving to a different rim diameter.
275/35R20 is a wider modern metric radial size, with 275 denoting nominal section width in millimeters, 35 indicating the aspect ratio, R for radial construction, and 20 for the wheel diameter. On the 2009 Audi A8 Quattro, this size belongs to a 20-inch wheel setup and gives the car a lower-profile performance look than the 18-inch and 19-inch options. BFGoodrich, Nitto, and Pro-Trac choices are available, including blackwall, raised white letter, and redline presentations across multiple series. This fitment deserves careful attention when appearance matters, because wheel width and clearance should be confirmed before replacing an existing 20-inch package.
Tire fitment is straightforward across the covered 2009 Audi A8 Quattro sub-models because each one shares the same three supported tire sizes. The real task is not separating trims by tire size, but confirming whether the car is currently equipped with 18-inch, 19-inch, or 20-inch wheels before choosing a replacement tire.
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2009 Audi A8 Quattro Base
The 2009 Audi A8 Quattro Base can use the same radial tire size range found across the rest of the lineup, so wheel diameter is the key detail to verify first. Once the wheel setup is confirmed, selection comes down to choosing among available radial series and sidewall treatments that suit the car’s intended look and use.
The 2009 Audi A8 Quattro L 4.2 shares the same tire-fitment choices as the other covered sub-models rather than using a unique size of its own. That makes replacement simpler, but it still pays to check the actual wheel diameter on the car before comparing blackwall, RWL, or redline radial options.
The 2009 Audi A8 Quattro L W12 uses the same supported radial tire sizes as the other versions of this model. Tire selection therefore starts with confirming the installed wheel package, then narrowing the choice by tire series, sidewall appearance, and the kind of road use expected from the car.
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 2009 Audi A8 Quattro Tires for Sale
Available 2009 Audi A8 Quattro tires center on radial choices from BFGoodrich, Nitto, and Pro-Trac in 255/45R18, 255/40R19, and 275/35R20. The main differences to compare are tire series, blackwall versus RWL or redline styling, and rim-width compatibility where stated.
These 2009 Audi A8 Quattro tire FAQs focus on the three supported sizes, wheel-diameter fitment, radial tire selection, sidewall choices, and the checks that matter before replacing tires on a luxury performance sedan.
Tire Size & Fitment
What tire size fits a 2009 Audi A8 Quattro?
The 2009 Audi A8 Quattro uses three radial tire sizes: 255/45R18, 255/40R19, and 275/35R20. Those sizes correspond to different wheel diameters, so there is not one universal replacement size for every car wearing the A8 Quattro name in this model year.
The practical first step is checking the wheels currently on the car rather than choosing by sub-model alone. All covered versions share these same fitment choices, so the deciding factor is whether the car has 18-inch, 19-inch, or 20-inch rims. After that, compare sidewall style, tire series, and any rim-width guidance that applies to the exact size.
What size rim does a 2009 Audi A8 Quattro use?
A 2009 Audi A8 Quattro can use 18-inch, 19-inch, or 20-inch rims, depending on which of its supported tire sizes is on the car. The matching tire sizes are 255/45R18 for 18-inch rims, 255/40R19 for 19-inch rims, and 275/35R20 for 20-inch rims.
Rim diameter should be confirmed from the wheel itself or from the tire already mounted before ordering replacements. Two sizes can appear visually similar on the car while still requiring different wheels. Once diameter is confirmed, it also helps to review wheel width, especially if the car has aftermarket wheels or if you are comparing different tire series within the same basic size.
Do all 2009 Audi A8 Quattro sub-models use the same tire size?
Yes. The 2009 Audi A8 Quattro Base, A8 Quattro L 4.2, and A8 Quattro L W12 all share the same three supported radial tire sizes: 255/45R18, 255/40R19, and 275/35R20. Tire size does not split along sub-model lines in this application.
That makes fitment easier, but it does not eliminate the need to inspect the actual wheel package on the car. A long-wheelbase model and a base model can still be running different wheel diameters in practice. The safest approach is to match the size already mounted unless there is a deliberate wheel change and the full wheel-and-tire setup has been checked for compatibility.
Choosing the Right Tire
What should I consider when choosing a tire for a 2009 Audi A8 Quattro?
Start with the correct tire size for the wheel diameter on the car: 255/45R18, 255/40R19, or 275/35R20. From there, compare radial tire series, sidewall appearance, and any stated rim-width range so the tire matches both the wheel and the kind of driving expected from a large all-wheel-drive luxury sedan.
Some owners will want a straightforward blackwall performance look, while others may prefer RWL or redline styling for a more customized presentation. It also helps to review load figures where they are given, especially if the car sees regular road use. Keeping the tire size matched to the wheel package is the foundation; appearance and product character come after that.
What sidewall styles are available for 2009 Audi A8 Quattro tires?
Sidewall choices for the 2009 Audi A8 Quattro include blackwall, RWL, and redline, depending on the tire size and product selected. Blackwall options appear across BFGoodrich and Nitto performance-oriented radials, while Pro-Trac Street Pro III adds raised white letter and redline alternatives in the supported sizes.
That means sidewall treatment can become part of the buying decision once the correct size is confirmed. Blackwall keeps the appearance closest to a modern luxury-performance presentation, while RWL and redline move the look in a more personalized direction. Any of those styles still need to be chosen in the proper 18-inch, 19-inch, or 20-inch fitment already on the car.
What brands offer tires for the 2009 Audi A8 Quattro?
BFGoodrich, Nitto, and Pro-Trac all offer tires in the supported 2009 Audi A8 Quattro sizes. Depending on the wheel diameter you need, available series include BFGoodrich g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, Nitto NT555 G2, and Pro-Trac Street Pro III.
The useful comparison is not simply brand against brand, but how each option lines up with the car’s setup and your priorities. Some choices focus on blackwall performance styling, while others introduce RWL or redline looks. Checking the exact tire size first keeps the comparison meaningful, since not every series appears in every one of the three wheel diameters.
Restoration & Appearance
Which tire should I choose for a period-style 2009 Audi A8 Quattro?
A period-style 2009 Audi A8 Quattro tire choice starts with retaining the wheel diameter and tire size already appropriate to the car, whether that is 255/45R18, 255/40R19, or 275/35R20. Since this is a modern luxury sedan with radial fitment, a blackwall radial usually preserves the most restrained and era-consistent overall presentation.
That does not mean alternative looks are off the table. RWL and redline choices are available in certain sizes and can shift the car toward a more customized appearance. Buyers focused on maintaining an authentic early-21st-century luxury-sedan feel should compare sidewall styling carefully and keep the wheel diameter and profile matched to the existing package.
How does tire choice affect the appearance of a 2009 Audi A8 Quattro?
Tire choice has a strong visual effect on a 2009 Audi A8 Quattro because the car’s stance changes noticeably with 18-inch, 19-inch, and 20-inch wheel-and-tire packages. Sidewall treatment matters too, with blackwall offering the most understated look and RWL or redline creating a more custom, attention-grabbing presentation.
Profile also plays a role. The 255/45R18 package presents more sidewall visually than the lower-profile 255/40R19 or 275/35R20 setups, even though the overall diameters stay fairly close. Matching the tire to the car’s existing wheel package usually keeps the appearance balanced, especially on a sedan where wheel proportion is part of the design character.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2009 Audi A8 Quattro?
Yes. Modifications such as aftermarket wheels, suspension changes, altered ride height, or bodywork differences can affect tire fitment on a 2009 Audi A8 Quattro even when the tire size sounds close to stock. This matters especially because the car already has three supported wheel diameters, each with its own size relationship.
A wheel with different width or offset can change how a 255/45R18, 255/40R19, or 275/35R20 sits in the fender and steering range. It is smart to verify wheel diameter, wheel width, and available clearance before replacing tires on a modified car. That check becomes even more important when stepping into a wider 20-inch package.
What should I inspect before driving a 2009 Audi A8 Quattro on new tires?
Before driving a 2009 Audi A8 Quattro on new tires, inspect the wheels for correct diameter and condition, confirm the tire size matches the installed rims, and check inflation carefully after mounting. It also helps to look over suspension and steering components so the new tires are not being asked to compensate for worn hardware.
A short initial road test should include attention to vibration, rubbing, and steering feel, particularly if the car wears 19-inch or 20-inch wheels. Rechecking pressure after the first drives is worthwhile. On a large luxury sedan, proper alignment and balanced wheels play a major role in how smoothly the new tires behave once on the road.
How often should tires on a 2009 Audi A8 Quattro be inspected?
Tires on a 2009 Audi A8 Quattro should be inspected regularly, not just when tread appears worn. Monthly pressure checks are a sensible baseline, and the tires should also be examined for uneven wear, cuts, bulges, cracking, or impact damage after rough roads or pothole contact.
A more thorough inspection before longer trips is especially useful on a car with low-profile 19-inch or 20-inch tires, since wheel and sidewall damage can be easier to miss at a glance. Cars that are driven infrequently still need attention because age and air loss can develop quietly. Consistent inspection helps protect ride quality as much as basic safety.
