Audi A5 Quattro Tires

Audi A5 Quattro uses four sizes across the years covered here. Model years 2008 through 2024 list 245/40R18 on 18-inch wheels and 255/35R19 on 19-inch wheels. The 2026 Audi A5 Quattro switches to 235/45R18 on 18-inch wheels and 245/40R19 on 19-inch wheels.

That means the correct tire is determined by both model year and wheel diameter. A buyer should match the tire size shown on the car now, then confirm the wheel diameter stamped on the wheel or verify it from the vehicle's original wheel specification so an 18-inch fitment is not confused with a 19-inch one.

On an Audi A5 Quattro, 245/40R18 is a modern metric radial size. The 245 is the section width in millimeters, 40 is the aspect ratio showing the sidewall height as a percentage of the width, R means radial construction, and 18 is the wheel diameter in inches. In this fitment group, that size applies to 2008-2024 cars using 18-inch wheels.

The practical point is that every part of the code matters. A tire with the same width but a different aspect ratio or wheel diameter is a different fitment, so an Audi A5 Quattro owner should match the full size code rather than selecting by width alone.

Audi A5 Quattro uses both 18-inch and 19-inch wheel diameters in the years covered here. The 18-inch fitments are 245/40R18 for 2008-2024 and 235/45R18 for 2026, while the 19-inch fitments are 255/35R19 for 2008-2024 and 245/40R19 for 2026. There is no single wheel diameter that covers every Audi A5 Quattro in this group.

Wheel diameter is the first physical check to make because an 18-inch tire cannot be mounted on a 19-inch wheel, and vice versa. Once the wheel diameter is confirmed, the year split narrows the choice to the correct size for that specific Audi A5 Quattro.

The quickest way to confirm the correct size for a year Audi A5 Quattro is to identify both the model year and the wheel diameter on the car. Years 2008-2024 use 245/40R18 or 255/35R19, while 2026 uses 235/45R18 or 245/40R19. That split means the same model name does not carry one universal tire size across the full span.

Start by reading the existing tire sidewall and then confirm that the wheel itself is 18 or 19 inches. If the car has had wheel changes during its life, rely on the actual wheel and tire measurements on the car rather than assuming the current setup still matches original specification.

Audi A5 Quattro tires in this group are offered primarily as blackwalls, with additional redline and RWL options appearing in 245/40R18. The 19-inch sizes shown here are blackwall only. That gives the 18-inch 2008-2024 fitment the broadest visual choice among the available products.

Sidewall style affects appearance more than fit, so the first step is still selecting the correct size and wheel diameter. Once fitment is settled, an Audi A5 Quattro owner can choose between a more contemporary blackwall look or a more distinctive sidewall treatment where that option exists.

The brands listed for Audi A5 Quattro fitments here are M&H Racemaster, BFGoodrich, Nitto, and Pro-Trac. BFGoodrich appears across all four sizes, while the other brands are concentrated in selected 18-inch applications. The available series include performance street and drag-oriented radial offerings.

Brand choice should come after the correct size is established. Once the fitment is narrowed to the proper 18-inch or 19-inch option for the specific Audi A5 Quattro, the owner can compare brand, sidewall style, and intended use to select the most suitable tire for the car's role.

Audi A5 Quattro tires here appear in several series, including Drag Radial, g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, Nitto NT555 G2, and Street Pro III. All are radial tires, but they are not aimed at the same use. Some are street-performance patterns, one is an all-season performance line, and the M&H listing is specifically a drag radial.

That distinction matters because the right series depends on how the Audi A5 Quattro is driven. A car used for regular road miles benefits from a street-oriented radial, while a specialized setup should be chosen only when the car's purpose and wheel size clearly match that tire's intended use.

An Audi A5 Quattro should be stored on a clean, dry surface away from direct sunlight, ozone sources, and wide temperature swings. Tires last better when they are kept out of prolonged UV exposure and away from electric motors, welders, and equipment that generate ozone. Proper inflation during storage also helps maintain casing shape.

If the Audi A5 Quattro sits for extended periods, move it occasionally so the tires do not carry the same load point month after month. Long-term storage is easier on the tires when the car is kept indoors and the pressures are checked before the car goes back into service.

Tires on an Audi A5 Quattro should be inspected regularly even if the car is driven infrequently. Check inflation pressure, tread wear pattern, sidewall condition, and any signs of impact damage or cracking. A collector or fair-weather car can age its tires without adding many miles, so time matters as much as tread depth.

A practical routine is to inspect the tires before each outing and give them a more thorough review at seasonal intervals. Uneven wear can also point to alignment or suspension issues, so an early inspection can prevent replacing a usable set before its time.

Tires on an Audi A5 Quattro should be replaced when age, hardening, cracking, bulges, impact damage, or persistent vibration indicate that the casing is no longer serviceable, even if tread remains. Tread depth alone does not tell the full story on a low-mileage car. A tire can look presentable and still be past its useful road life.

That is especially important on a performance-oriented car where handling and braking depend on a sound tire structure. If an Audi A5 Quattro spends long periods parked or is driven only occasionally, age-related inspection by a qualified tire professional is the best way to decide when replacement is due.

The radial tires listed for Audi A5 Quattro are modern road-use tire types, but safety depends on choosing the correct size, matching the wheel diameter, and using a tire suited to the car's actual purpose. A street-performance radial and a drag-oriented radial are not the same kind of tire even when they share the same nominal size. Condition, age, and proper inflation also matter as much as fitment.

For public-road use, an Audi A5 Quattro owner should prioritize the tire series that matches normal driving rather than selecting by appearance alone. After installation, a careful road test and regular pressure checks help confirm that the car behaves correctly at everyday speeds.

Before driving an Audi A5 Quattro, check that the tires match the wheel diameter, inflation is correct, sidewalls show no visible damage, and tread wear is even across the axle. It is also wise to confirm that all four tires are an appropriate matched set for an all-wheel-drive car. Differences in size or overall rolling diameter can create avoidable driveline and handling issues.

A short pre-drive walkaround is usually enough to catch the most important concerns. If the Audi A5 Quattro has been parked for a long stretch, include a closer look for flat spotting, age cracking, or pressure loss before putting meaningful miles on the car.

The safe operating speed for an Audi A5 Quattro depends on the exact tire fitted, its condition, and whether the tire is intended for street use or a more specialized purpose. The sizes listed here include modern radial performance products, but the tire's service condition is still the real limiter. An aged or damaged tire should not be treated as if it can perform like a fresh one.

For practical use, drive the Audi A5 Quattro within normal road conditions only after confirming that the tires are correctly sized, properly inflated, and in sound condition. If the car is fitted with a specialized tire such as a drag radial, use should match that tire's intended role rather than assuming it is interchangeable with a general street tire.