2008 Audi A6 Tires

The 2008 Audi A6 uses two primary tire sizes: 245/40R18 and 245/45R17. Both are radial tire sizes, and both are used on the A6 Base depending on the wheel package installed on the car.

The practical difference is wheel diameter, not a change in basic vehicle identity. A6 owners should confirm whether the car has 17-inch or 18-inch wheels before choosing a tire, especially if the car has changed hands, has aftermarket wheels, or has been modified since new.

A 2008 Audi A6 uses either a 17-inch or 18-inch rim, depending on which of its two primary tire sizes is on the car. The 245/45R17 size belongs on a 17-inch rim, while the 245/40R18 size belongs on an 18-inch rim.

That makes wheel confirmation the first fitment check. Looking only at the car’s model name is not enough, because the A6 Base can use both sizes. Measuring the wheel or reading the current tire sidewall is the safest way to begin before comparing tire series or sidewall treatments.

The 2008 Audi A6 has more than one tire size because it was fitted with different wheel diameters. In this case, the two primary sizes are 245/45R17 and 245/40R18, both radial, with very similar overall diameter but different rim fitment.

That means the choice is tied to the wheel setup already on the car rather than one size being universally right for every A6. Owners should match the tire to the installed wheel diameter and then compare the available series, load specifications, and appearance options within that correct size.

Start with the correct size for the car’s wheel diameter: 245/45R17 for 17-inch wheels or 245/40R18 for 18-inch wheels. From there, compare construction, intended use, load figures where stated, and whether the tire is aimed more at general street driving or a more specialized purpose.

Appearance can matter too, because available choices include blackwall, redline, and raised white letter styles. It also helps to review rim-width compatibility on the specific tire being considered, especially if the Audi has non-stock wheels or if the goal is to preserve a certain stance or visual character.

Tires for the 2008 Audi A6 are available in blackwall, redline, and RWL sidewall styles. Blackwall is the most common presentation in both 245/40R18 and 245/45R17, while Pro-Trac Street Pro III versions add redline and raised white letter alternatives.

The sidewall choice affects the car’s visual character more than the basic fitment. A blackwall tire keeps a more understated late-model look, while redline or raised white letter styling creates a more customized presentation. The key is still selecting the style within the correct 17-inch or 18-inch tire size.

Available brands for the 2008 Audi A6 include BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac. Those choices appear across both primary sizes, 245/40R18 and 245/45R17, with several different tire series and sidewall treatments depending on the exact product.

That gives buyers room to compare more than just the brand name. It is worth looking at whether the tire is a blackwall performance radial, a drag-oriented radial, or a style-driven option such as redline or raised white letter, while still keeping wheel diameter and intended use at the center of the decision.

A period-style 2008 Audi A6 tire choice starts with keeping the correct modern radial size for the wheel setup already on the car, either 245/45R17 or 245/40R18. For most owners, a blackwall radial will remain the closest match to the understated appearance associated with this generation.

The final decision depends on whether the goal is stock-like presentation or a more customized look. Redline and raised white letter options are available, but they change the visual tone considerably. Owners pursuing strict originality should compare any appearance choice against period Audi sales material or marque-specific references.

Construction is less of an appearance divide on a 2008 Audi A6 than it would be on an earlier collector car because the primary fitments are already radial. The bigger visual difference comes from sidewall treatment, with blackwall presenting a cleaner OEM-era look than redline or raised white letter styling.

That means a restoration-minded owner is usually deciding between subtlety and customization rather than bias-ply versus radial appearance. Wheel diameter still matters because the 17-inch and 18-inch sizes create slightly different proportions, so the tire should match both the wheel setup and the intended finish of the car.

Yes, modifications can affect tire fitment on a 2008 Audi A6. Even when the car uses one of the correct primary sizes, changes such as aftermarket wheels, altered wheel width, different offset, lowered suspension, or body changes can affect clearance and how the tire sits in the wheel opening.

That is why the wheel setup should be checked before ordering a replacement tire, especially on a car that no longer wears its original wheels. A tire that matches the size code still needs to be evaluated against the actual rim dimensions and available room during turning, compression, and normal road use.

Before driving a 2008 Audi A6 on new tires, inspect wheel condition, verify the tire size matches the installed wheel diameter, and confirm inflation is set appropriately for the tire in use. It also helps to look for any suspension or alignment issues that may have contributed to uneven wear on the previous set.

A short clearance check is worthwhile after installation. Turn the steering through its range, look at inner and outer fender room, and watch for any rubbing if the car has non-stock wheels or suspension changes. Rechecking pressure and lug torque after initial driving is also good practice.

Tires on a 2008 Audi A6 should be inspected regularly, not just when tread looks worn. A quick visual check for cuts, cracking, bulges, punctures, air loss, and uneven wear is smart before longer drives, and a closer inspection should be part of routine maintenance.

That matters even more on a car that sees seasonal or occasional use. Tires can age or lose pressure while the car is parked, and performance-oriented low-profile sizes are less forgiving of neglect. Keeping pressures stable and catching wear early helps protect both ride quality and fitment confidence.