2009 Audi Tire Fitment Guide

2009 Audi vehicles use 18 different tire sizes across the lineup: 215/55R16, 225/45R17, 225/50R17, 225/40R18, 235/45R17, 235/40R18, 235/35R19, 245/45R17, 245/40R18, 255/45R18, 255/40R18, 255/40R19, 255/35R19, 265/35R19, 265/35R20, 275/35R20, 295/30R19, and 305/30R19. They do not all fit the same cars. A3 models use 225-section sizes, A4 and A6 families use several 16- through 19-inch options, A8 Quattro uses 18- through 20-inch sizes, and the R8 uses its own staggered 19-inch fitments.

Rim diameter is the first filter because the 2009 Audi range spans 16-, 17-, 18-, 19-, and 20-inch wheels. Rim width also varies by size where product guidance exists, such as 7.5 to 9.0 inches for 225/40R18, 8.0 to 9.5 inches for 245/40R18, and 9.0 to 11.0 inches for 275/35R20. If your car has had wheels changed at some point, compare the tire sidewall and the actual wheel before choosing a replacement.

On a 2009 Audi, 225/40R18 is a metric radial size. The 225 is the nominal section width in millimeters, 40 is the aspect ratio, R means radial construction, and 18 is the wheel diameter in inches. Within the 2009 Audi range, that size belongs to the A3 and A3 Quattro. Available products in this size carry W speed ratings, which correspond to a maximum rated speed of 168 mph.

That code matters because a 225/40R18 is much shorter in sidewall height than a 225/45R17 even though the section width starts the same. It also expects an 18-inch wheel, with product fitment guidance centered around roughly 7.5 to 9.0 inches of rim width. If your A3 or A3 Quattro has aftermarket wheels, do not assume the original size still applies without checking what is mounted on the car now.

No, 2009 Audi models do not use one shared tire size. The compact A3 pair uses 225/45R17 or 225/40R18, the A4 family spreads across six different sizes, the A8 Quattro moves up to 18-, 19-, and 20-inch fitments, and the R8 uses dedicated 19-inch staggered sizes including 235/35R19 at the front and 295/30R19 or 305/30R19 at the rear. Even closely related models such as A4 and A4 Quattro do not carry exactly the same fitments.

That means year and make alone are not enough for a confident tire choice on a 2009 Audi. You need the exact model, and in many cases you also need to confirm which wheel package is on the car. Looking at the sidewall already mounted on the vehicle is often the quickest way to narrow it down, especially on cars that may have changed wheels over time.

Most 2009 Audi tire sizes are available as blackwalls, which is the expected modern look for an Audi of this era. A few sizes add specialty sidewall treatments: 215/55R16 can be found as redline or wide whitewall, 255/45R18 and 275/35R20 can be found with raised white letters, and 305/30R19 and 265/35R20 can be found in redline or raised white letter form. Those styling choices are unusual compared with the original visual character of most 2009 Audi models.

For a factory-like appearance, blackwall is the natural choice on nearly every 2009 Audi, especially A, S, TT, and R8 models. Specialty sidewalls may appeal to custom builds, restomods, or owners intentionally changing the visual theme, but they alter the car's period-correct look. If appearance matters as much as fitment, check both the sidewall style and the tire size before moving on to tread pattern or brand preference.

2009 Audi tire coverage comes from BFGoodrich, Nitto, M&H Racemaster, American Classic, and Pro-Trac, depending on the size. BFGoodrich and Nitto cover many of the mainstream 17-, 18-, 19-, and 20-inch metric radial sizes. M&H Racemaster appears in 245/45R17 and 245/40R18, American Classic appears in 215/55R16, and Pro-Trac appears in sizes such as 255/45R18, 275/35R20, 305/30R19, and 265/35R20.

Brand choice on a 2009 Audi is usually driven by the exact size and the look or character you want from the tire, not by the Audi badge alone. Some sizes have broad brand coverage, while others are much narrower. Once the size is confirmed, compare the available brands for speed rating, sidewall style, and rim-width suitability so the tire matches both the wheel and the way you use the car.

On several 2009 Audi sizes, BFGoodrich g-Force Comp 2 A/S and BFGoodrich g-Force Phenom T/A overlap in fitment but differ in published speed ratings and some load details. In 255/35R19, the Comp 2 A/S appears as a 96W tire while the Phenom T/A appears as a 96Y tire. In 235/40R18, the Comp 2 A/S is available as a 95W while the Phenom T/A is available as a 95Y, and in 245/40R18 the Comp 2 A/S appears with a Y rating while another BFGoodrich option in the same size remains W-rated.

The practical difference is that a Y-rated tire carries a higher speed ceiling than a W-rated one, with Y indicating 186+ mph and W indicating 168 mph. That does not automatically make one tire the right choice for every driver, especially on street-driven Audis that will never approach those speeds. Compare the exact size first, then use the speed letter, rim-width range, and sidewall preference to narrow the final choice.

Rim width depends on the exact tire size used on the 2009 Audi model. Examples include 7.0 to 8.5 inches for 225/45R17, 7.5 to 9.0 inches for 225/40R18 and 245/45R17, 8.0 to 9.5 inches for 245/40R18 and 235/40R18, 8.5 to 10.0 inches for 255/35R19 and 255/40R18, 8.5 to 10.5 inches for 265/35R19 and 265/35R20, and 9.0 to 11.0 inches for 275/35R20. Some sizes also show a preferred measuring rim within that range.

That range matters because the right diameter alone does not guarantee the right fit on the wheel. A tire mounted on a rim that is too narrow or too wide can change the tread shape and the way the tire sits on the car. Before choosing a replacement for any 2009 Audi, compare the tire size to the actual wheel width so the tire and wheel are working together as intended.

The available 2009 Audi products are radial tires intended as tubeless applications rather than tube-type collector sizes. Some size markings explicitly include TL, such as 245/40ZR18 97Y XLTL and 255/40ZR19 100Y XLTL, while the rest follow modern tubeless metric radial conventions. There is no sign here of tube-type-only fitments among the 2009 Audi sizes covered.

That said, the wheel still matters. If an Audi has unusual aftermarket wheels or a damaged rim bead seat, the solution is not to assume a tube should be added. Confirm the wheel condition, the tire's exact sidewall marking, and the manufacturer's mounting guidance before installation, especially on high-performance sizes with very short sidewalls.

A 2009 Audi should be stored away from direct sunlight, ozone sources such as electric motors or compressors, and standing moisture. Keep the tires properly inflated, roll the car occasionally if it sits for long periods, and avoid leaving one spot of the tread carrying the full vehicle weight for months at a time. Modern radials generally tolerate storage better than old bias-ply tires, but they still age when neglected.

The practical goal is to prevent sidewall weathering, tread flat-spotting, and hidden stress from underinflation. If your Audi is a low-mileage collector, seasonal toy, or second car, a simple storage routine often preserves the tires far better than mileage alone would suggest. A cool, dry garage and periodic pressure checks do more for tire life than many owners realize.

On a 2009 Audi, tire age is usually more important than tread depth once the car becomes a low-use enthusiast or collector vehicle. A good rule is to begin evaluating tires closely around five to seven years of age and to treat roughly ten years as a serious replacement threshold regardless of remaining tread. The DOT date code on the sidewall tells you when the tire was made.

That matters because many 2009 Audi models, especially A8, S, TT, and R8 variants, can still wear tires that look acceptable at a glance while the rubber has already hardened with age. If the car sees occasional use, a fresh tire is often the safer choice than trying to stretch old rubber for one more season. Age, storage history, and visible condition should guide the decision together.

Tires on a 2009 Audi should be inspected before every drive, and more thoroughly before any extended highway trip. Look for sidewall cracking, cuts, bulges, uneven tread wear, and pressure loss, and pay extra attention to the very low-profile sizes used on models like the S5, S6, S8, A8 Quattro, and R8 because short sidewalls can hide impact damage after a pothole strike.

A quick walkaround catches problems early, but a more careful inspection with the wheels turned can reveal shoulder wear or sidewall issues you will miss otherwise. On cars that sit often, check pressure regularly rather than assuming the tires are still ready because the tread looks deep. A spare, if the car carries one, deserves the same age and condition check as the road tires.

Yes, the 2009 Audi tire sizes covered here are modern radial fitments suitable for highway use when they are the correct size, properly inflated, and in sound condition. Many products in these sizes carry W ratings, good to 168 mph, while some carry Y ratings, good to 186+ mph. Those speed ratings exceed normal highway use by a wide margin, and on most 2009 Audi models the condition of the car itself matters at least as much as the tire's top-speed capability.

Highway safety depends on matching the correct size to the correct wheel, maintaining pressure, and avoiding aged or damaged tires. That is especially important on performance models and low-profile fitments, where a damaged sidewall can have a bigger effect on ride and control. If an Audi has been sitting, inspect the tires carefully before trusting them on an extended interstate drive.

Inflation pressure on a 2009 Audi should start with the factory vehicle recommendation, because Audi set pressure by model, axle load, and intended use. Tire pressure ceilings within the available products vary by size. Examples include load-and-pressure figures such as 1,389 pounds at 50 psi for some 225/40R18 applications, 1,609 pounds at 50 psi for some 245/40R18 applications, 1,929 pounds at 50 psi for some 255/45R18 applications, and 1,874 pounds at 50 psi for some 275/35R20 applications.

Those tire figures are maximum load-at-pressure ratings, not a universal everyday inflation target for every 2009 Audi. The right approach is to use the Audi placard or owner's manual for the vehicle's baseline setting, then confirm that the tire you chose is appropriate for that load and pressure range. Do not transfer a pressure number from one Audi size to another just because both are radials.

Before a longer drive in a 2009 Audi, inspect each tire for cracking, punctures, bulges, sidewall cuts, and uneven wear, then verify cold inflation pressure. Also check tread depth across the full width, since sport-oriented Audi alignments and wider rear fitments can wear the inner shoulder first. If the car uses staggered sizes, as the R8 does, confirm that front and rear positions have not been mixed.

Tires are only one part of the pre-trip picture on a 2009 Audi, but they are the part touching the road. It is also wise to look over brakes, suspension condition, and wheel fastener torque before a long outing, particularly on high-performance or low-profile applications. A careful pre-drive check takes only a few minutes and can prevent a roadside problem that was already visible in the garage.