The 2023 Audi S8 sits at the sharp end of the modern performance-luxury sedan market, combining full-size comfort with the kind of speed and composure expected from Audi’s S-badged flagship models. For a car with that mix of refinement and serious road capability, tire fitment plays a major role in preserving both appearance and driving character. The 2023 Audi S8 uses radial tires in two metric sizes, 265/35R21 and 265/40R20, so the first step is confirming which wheel diameter is on the car. From there, the decision becomes choosing the right size-specific tire for the vehicle’s current wheel setup and intended road use.
Which Tire Size Is Right for The 2023 Audi S8
The 2023 Audi S8 uses two primary tire sizes, and the difference comes down to wheel diameter rather than a change in basic tire construction. Both are metric radial fitments, but one is built for a 21-inch rim and the other for a 20-inch rim, so confirming the actual wheel size on the car is the first and most important step before selecting a tire.
The size 265/35R21 identifies a metric radial tire with a 265-millimeter nominal section width, a 35-series aspect ratio, and fitment for a 21-inch rim. On a 2023 Audi S8, this size reflects a low-profile performance-oriented setup that suits the car’s modern wheel package and athletic character. Modern metric radial sizing is familiar to current buyers, so the main concern is less about decoding the size and more about matching the exact rim diameter already on the vehicle. This is the size to evaluate when the car is equipped with 21-inch wheels and you want to maintain the proper sizing relationship.
The size 265/40R20 uses the same 265-millimeter nominal section width but pairs it with a 40-series profile on a 20-inch rim. That makes it another modern metric radial fitment for the 2023 Audi S8, with nearly the same overall diameter as the 21-inch option while using a different wheel diameter. Because the sizing stays close in overall proportion, the real distinction is wheel fitment rather than a dramatic change in tire category. This is the size to choose only after confirming that the car is running 20-inch wheels rather than the alternate 21-inch setup.
Fitment is straightforward here because the covered sub-model shares the same two radial tire sizes used on the core vehicle. The main task is not identifying a different trim-specific tire package, but confirming whether the car has 20-inch or 21-inch wheels before choosing a tire.
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2023 Audi S8 Base
The 2023 Audi S8 Base uses the same two radial tire sizes found on the model overall, with one size tied to a 20-inch wheel and the other to a 21-inch wheel. Tire selection starts with verifying the wheel diameter currently on the car, then choosing the correct metric radial size for that setup.
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.
Frequently Asked Questions
Common questions for the 2023 Audi S8 usually center on the two tire sizes, the difference between the 20-inch and 21-inch wheel setups, and what owners should inspect before putting a high-performance luxury sedan back on the road.
Tire Size & Fitment
What tire size fits a 2023 Audi S8?
The 2023 Audi S8 uses two tire sizes: 265/35R21 and 265/40R20. Both are radial metric fitments, and both are correct for this exact year and model depending on the wheel diameter installed on the car.
The key point is that these are not interchangeable primary fitments on the same wheel. A 265/35R21 belongs on a 21-inch rim, while a 265/40R20 belongs on a 20-inch rim. Before choosing a tire, check the actual wheel size currently on the vehicle, especially if the car has seen a wheel package change or was purchased used.
What size rim does a 2023 Audi S8 use?
The 2023 Audi S8 uses either a 21-inch rim with 265/35R21 tires or a 20-inch rim with 265/40R20 tires. Both wheel diameters are part of the fitment picture for this model year.
Rim diameter is the first detail to verify because it determines which tire size belongs on the car. A tire sized for a 20-inch wheel cannot be mounted on a 21-inch wheel, and the reverse is also true. Checking the wheel itself or the existing tire sidewall is the quickest way to confirm which fitment your S8 needs.
Why does the 2023 Audi S8 have more than one tire size?
The 2023 Audi S8 has more than one tire size because it was fitted with two different wheel diameters: 20 inches and 21 inches. That creates two correct radial tire sizes, 265/40R20 and 265/35R21, rather than one universal fitment.
The overall tire proportions stay very close, but the rim diameter changes the exact size code. That means the selection process is really about matching the tire to the wheel already on the car. Any owner comparing replacement tires should confirm the current wheel setup first instead of choosing by model name alone.
Choosing the Right Tire
What should I consider when choosing a tire for a 2023 Audi S8?
Start with the correct size for the wheel on the car: 265/35R21 for a 21-inch rim or 265/40R20 for a 20-inch rim. Since both are radial metric fitments for the 2023 Audi S8, the main decision begins with exact size matching rather than construction choice.
After that, focus on how the car is used. A daily-driven S8, a fair-weather performance sedan, and a low-mileage garage-kept example may place different priorities on ride feel, appearance, and replacement timing. It also helps to inspect the current wheel and tire package closely if the car has aftermarket wheels or any prior modifications.
How do I choose between the available 2023 Audi S8 tire sizes?
Choosing between the available sizes is not a matter of preference alone, because each size matches a different wheel diameter. The 2023 Audi S8 uses 265/35R21 with a 21-inch rim and 265/40R20 with a 20-inch rim.
The practical answer is to choose the size that matches the wheel currently installed on the car. Looking only at overall proportions can be misleading, since the two sizes are close in height but built for different rims. A quick wheel check prevents ordering the wrong size and keeps the fitment process straightforward.
What rim-fitment details should I compare when choosing 2023 Audi S8 tires?
The most important rim-fitment detail is diameter. For the 2023 Audi S8, 265/35R21 is built for a 21-inch wheel and 265/40R20 is built for a 20-inch wheel, so the tire size has to match the wheel exactly.
It is also smart to confirm that the wheel setup on the car has not been changed from stock-type sizing. If the S8 has aftermarket wheels, check the wheel markings and compare the current tire sidewall before replacing anything. That simple inspection helps avoid mismatch issues and keeps the new tire aligned with the car’s existing package.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2023 Audi S8?
Yes, modifications can affect tire fitment on a 2023 Audi S8. Wheel changes, suspension alterations, ride-height adjustments, and body or fender modifications can all influence whether the current tire size remains appropriate for the car.
An S8 with aftermarket wheels may still use one of the original tire sizes, but that should never be assumed without checking the actual setup. Clearance at full steering lock, wheel diameter, and the relationship between tire and wheel all matter. Any owner dealing with a modified car should confirm those basics before selecting replacement tires.
What should I inspect before driving a 2023 Audi S8 on new tires?
Before driving a 2023 Audi S8 on new tires, inspect the wheels for damage, confirm that the tire size matches the wheel diameter, and make sure the tires are seated and inflated properly. A quick visual check for cuts, bulges, or abnormal mounting issues is also worthwhile.
It also helps to look at the condition of suspension and steering components if the car has high mileage or has been stored for periods of time. Uneven wear, vibration, or pull can come from underlying chassis issues rather than the tire itself. A careful inspection at installation helps the new tires work as intended from the start.
What should I check before a longer drive in a 2023 Audi S8?
Before a longer drive in a 2023 Audi S8, check tire pressure, inspect the tread and sidewalls, and confirm that all four tires are the correct size for the wheels on the car. The two valid sizes for this model are 265/35R21 and 265/40R20, depending on wheel diameter.
A longer trip is also a good time to look for signs of slow air loss, irregular wear, or damage from potholes and road impacts. On a high-performance luxury sedan, small issues can become more noticeable at speed. Taking a few minutes to inspect the tires and wheels can prevent avoidable problems once the drive begins.
