The 2009 Audi A6 Quattro sits in the later C6 generation, blending executive-sedan comfort with Audi’s all-wheel-drive character and a distinctly modern stance. Buyers looking at one today are often balancing daily road use, enthusiast driving, and keeping the car visually appropriate to its original wheel setup. Tire fitment centers on three radial sizes: 245/45R17, 245/40R18, and the 255/35R19 fitment tied to 19-inch-option cars. That opens the door to different product families, including blackwall performance radials and select redline or raised white letter options in the 17- and 18-inch sizes. The key is matching the tire to the exact sub-model and wheel diameter already on the car.
Which Tire Size Is Right for The 2009 Audi A6 Quattro
The 2009 Audi A6 Quattro uses three primary tire sizes, and the right one depends on the exact sub-model and wheel diameter. Most cars use either 245/45R17 or 245/40R18, while the 19-inch-option fitment moves to 255/35R19. Before comparing tread styles or brands, confirm whether the car is on 17-, 18-, or 19-inch wheels and whether it is a standard or 19-inch-option configuration.
245/40R18 is a metric radial size in which 245 is the nominal section width in millimeters, 40 is the aspect ratio, R identifies radial construction, and 18 is the rim diameter in inches. On the 2009 Audi A6 Quattro, this size supports a lower-profile look than the 17-inch fitment while remaining a primary factory-era sizing style for the covered applications. Available choices include blackwall options from BFGoodrich, Nitto, and M&H Racemaster, along with Pro-Trac Street Pro III versions in redline and RWL form. This size is worth considering when the car already wears 18-inch wheels and the goal is to keep the intended wheel-and-tire proportion intact.
245/45R17 is a metric radial size with a 245-millimeter nominal section width, a 45-series profile, radial construction, and a 17-inch rim diameter. For the 2009 Audi A6 Quattro, it is one of the core fitments used across several sub-models and keeps the car on the 17-inch wheel package. Product choice includes blackwall performance-oriented tires from BFGoodrich, Nitto, and M&H Racemaster, plus Pro-Trac Street Pro III options offered with redline or raised white letter sidewalls. This size makes sense when preserving the existing 17-inch setup is more important than moving to a larger wheel presentation.
Fit(s): 4.2 (19 Inch Option) and Avant 3.0T (19 Inch Option)
Construction: Radial|Rim: 19 in
255/35R19 is a metric radial size where 255 is the nominal section width in millimeters, 35 is the aspect ratio, R denotes radial construction, and 19 is the rim diameter. On the 2009 Audi A6 Quattro, this size belongs to the 19-inch-option applications rather than the standard wheel packages. The available selections stay focused on blackwall BFGoodrich performance series, including g-Force Comp 2 AS, g-Force Sport Comp 2, and g-Force Phenom T/A. This fitment should be evaluated only after confirming that the car is actually using the 19-inch-option wheel package.
Sub-model fitment for the 2009 Audi A6 Quattro is mostly straightforward, but it is not identical across every version. Standard 3.0T, 4.2, and Avant 3.0T applications share the 17- and 18-inch tire paths, while the 19-inch-option configurations move to a different size that requires wheel confirmation first.
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2009 Audi A6 Quattro 3.0T
The 2009 Audi A6 Quattro 3.0T uses the 245/40R18 and 245/45R17 radial fitments. Tire selection comes down to confirming which wheel diameter is on the car, then choosing among the available blackwall, redline, or RWL options that suit its intended look and use.
The 2009 Audi A6 Quattro 4.2 shares the same 245/40R18 and 245/45R17 radial sizing used on other standard-wheel applications. The practical step is verifying whether the car is on 17-inch or 18-inch wheels before comparing tire series, sidewall styles, and other product differences.
The 2009 Audi A6 Quattro 4.2 (19 Inch Option) uses the 255/35R19 radial fitment tied to the larger wheel package. Tire choice here is narrower in sidewall style than the 17- and 18-inch sizes, so wheel confirmation matters first and product-series comparison follows after that.
The 2009 Audi A6 Quattro Avant 3.0T uses the same 245/40R18 and 245/45R17 radial sizes found on the standard 3.0T and 4.2 applications. That gives the buyer flexibility to stay with the current wheel diameter while comparing blackwall performance options or period-inspired redline and RWL alternatives.
The 2009 Audi A6 Quattro Avant 3.0T (19 Inch Option) moves to the 255/35R19 radial size. This makes the first fitment decision very simple: verify that the car has the 19-inch-option wheels before selecting among the available blackwall tire series in that size.
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 A6 Quattro Tires for Sale
Available 2009 Audi A6 Quattro tires span 17-, 18-, and 19-inch radial fitments from BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac. Depending on size, buyers can compare blackwall performance tires, drag-radial offerings, and select redline or RWL versions in the Street Pro III series.
These 2009 Audi A6 Quattro tire FAQs focus on exact size fitment, wheel-diameter differences, available radial choices, sidewall and brand options, and the inspections that matter before regular road use.
Tire Size & Fitment
What tire size fits a 2009 Audi A6 Quattro?
The 2009 Audi A6 Quattro uses three primary radial tire sizes: 245/45R17, 245/40R18, and 255/35R19. The 17- and 18-inch sizes apply to the standard 3.0T, 4.2, and Avant 3.0T configurations, while 255/35R19 is tied to the 19-inch-option versions of the 4.2 and Avant 3.0T.
The main step is identifying the wheel diameter already on the car and confirming whether it is a standard or 19-inch-option setup. Once that is settled, the tire decision becomes a matter of choosing among the available radial product lines and sidewall treatments offered in the correct size.
What size rim does a 2009 Audi A6 Quattro use?
A 2009 Audi A6 Quattro can use 17-inch, 18-inch, or 19-inch rims, depending on the exact sub-model and wheel package. The 245/45R17 fitment uses a 17-inch rim, the 245/40R18 fitment uses an 18-inch rim, and the 255/35R19 fitment uses a 19-inch rim.
That makes wheel-diameter confirmation the first checkpoint before ordering tires. A car may have been changed from its original wheel package over time, so checking the actual rim on the vehicle is more useful than assuming fitment based only on the model name or trim badge.
Why does the 2009 Audi A6 Quattro have more than one tire size?
More than one tire size appears on the 2009 Audi A6 Quattro because different sub-models and wheel-option packages were fitted with different rim diameters. Standard applications use either 245/45R17 or 245/40R18, while the 19-inch-option versions use 255/35R19 to match the larger wheel package.
That difference is not just a matter of preference at the tire level. The correct size follows the wheel diameter already on the car, so a buyer should verify the exact wheel setup first and then compare tires only within the matching 17-, 18-, or 19-inch fitment group.
Choosing the Right Tire
What should I consider when choosing a tire for a 2009 Audi A6 Quattro?
Start with the correct size for the car’s actual wheel package: 245/45R17, 245/40R18, or 255/35R19. From there, compare radial product differences such as tire series, sidewall style, rim-width compatibility, load figures where stated, and whether the tire is aimed more at drag-race use or general street performance.
The right choice depends on how the car is used and how it is meant to look. A daily-driven A6 Quattro may call for a different approach than a weekend car with custom styling touches, so matching the tire’s intended purpose to the vehicle’s wheel setup matters as much as the size itself.
What sidewall styles are available for 2009 Audi A6 Quattro tires?
Blackwall is available across all three primary sizes for the 2009 Audi A6 Quattro. In the 245/45R17 and 245/40R18 sizes, Pro-Trac Street Pro III also adds redline and RWL sidewall treatments, giving those wheel packages more visual variety than the 255/35R19 fitment.
Sidewall style is largely an appearance decision once the correct size is established. A blackwall keeps a more understated modern look, while redline or raised white letter can give a customized presentation, so the buyer should choose the style that suits the car without losing sight of proper wheel and size matching.
What brands offer tires for the 2009 Audi A6 Quattro?
Tires for the 2009 Audi A6 Quattro are available from BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac. Brand availability varies by size, with the 17- and 18-inch fitments offering the broadest spread, while the 255/35R19 size stays concentrated in BFGoodrich product lines.
Brand is only one part of the comparison. It helps to look at the tire series, sidewall treatment, intended use, and wheel-width suitability within the correct size, since those details shape whether the tire makes sense for a street-driven sedan, an enthusiast car, or a more appearance-focused build.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2009 Audi A6 Quattro?
Yes. Wheel changes, suspension lowering, offset differences, and body or brake upgrades can all affect tire fitment on a 2009 Audi A6 Quattro, even when the tire size itself matches one of the recognized factory-era sizes. The 19-inch-option size especially makes wheel-package verification important before comparing tire choices.
A car with aftermarket wheels should be checked for actual rim diameter and width, plus steering and fender clearance through full travel. Looking at the current setup on the vehicle is the safest way to avoid choosing a tire that matches the badge or trim level but not the wheel and suspension combination now installed.
What should I inspect before driving a 2009 Audi A6 Quattro on new tires?
Before road use, inspect the wheels for the correct diameter and obvious damage, confirm the tires match the intended size, and check for proper inflation. It also helps to look over suspension and steering components, since worn parts can affect how a fresh set of tires behaves on a heavier all-wheel-drive sedan.
A short clearance check is worthwhile before regular driving, especially if the car has different wheels than it left the factory with. Turning lock to lock, checking for rubbing, and making sure the tires seat and balance properly can prevent small fitment issues from becoming vibration, uneven wear, or contact problems on the road.
How often should tires on a 2009 Audi A6 Quattro be inspected?
Tires on a 2009 Audi A6 Quattro should be inspected regularly, not just at replacement time. Routine checks should include tread wear, air pressure, sidewall cracking, punctures, bulges, and any sign of uneven wear that could point to alignment, suspension, or wheel issues.
Cars that are driven infrequently still need attention because age and storage conditions can affect tire condition even when tread looks acceptable. Frequent visual checks and periodic professional inspection are especially useful on an all-wheel-drive car, where keeping the tires in sound condition helps preserve stable behavior and consistent road manners.
