OEM wheel and tire fitment specs for the 2003 Audi S8, including bolt pattern (PCD), center bore diameter, thread size, rim diameter, rim width, wheel offset, and backspacing.
Recorded OEM specifications for the 2003 Audi S8, donor years with overlapping ranges, and a calculator to compare a selected wheel. Range overlap is not a guaranteed fit.
Thread-only product links are shopping examples, not verified fits. Seat style is not confirmed here. As an Amazon Associate we earn from qualifying purchases.
Donor vehicles with overlapping OEM specs
These are vehicle-year records whose recorded OEM ranges overlap this 2003 Audi S8. Overlap is not a guarantee that a specific wheel will install. Selected-wheel comparison is in the calculator below.
Evaluated 143 donor years. Listed 24 eligible overlaps (not all evaluated years are compatible). Showing all listed.
Wheel geometryOEM width/offset ranges overlap (not a specific wheel)
Recorded OEM bolt pattern, center bore, and width/offset ranges overlap. This is not a guarantee that every wheel from the donor year fits this vehicle.
Hub-centric rings of about 66.5 → 57.1 mm mm may be relevant if the wheel bore is larger than the hub; clearance is not verified. Donor width/offset sits outside the known OEM envelope for this vehicle.
Hub-centric rings of about 66.5 → 57.1 mm mm may be relevant if the wheel bore is larger than the hub; they cannot enlarge a smaller bore. Approximate position vs the mid OEM package: outer change -0.35 mm, inner change -12.35 mm. This uses aggregated width/offset ranges, not a specific wheel.
Wheel geometryOEM width/offset ranges overlap (not a specific wheel)
Approximate position vs the mid OEM package: outer change -9.35 mm, inner change -3.35 mm. This uses aggregated width/offset ranges, not a specific wheel.
Audi S8 Years With Compatible Wheels
Only years with evidence-based interchange relationships are listed. Adjacent years are not assumed compatible.
Compare a donor vehicle or custom wheel against this 2003 Audi S8. Use Compare in calculator on a donor row above to fill the donor side of this same calculator.
Compare
Compare wheel compatibility between two vehicles
Wheels from (donor vehicle)
Selected Car:
Custom wheel size (optional)
Tip: change values here to simulate custom wheels and immediately see the impact in the comparison below.
Custom tire size (optional)
Installed on (your vehicle)
Selected Car:
2003 Audi S8
Compare Rims
Specification
Wheels from
Installed on
Result (Click it)
Bolt Pattern
The total number of bolt holes and the diameter of the circle they form.
-
5x112
Center Bore
The hole in the center of the wheel that fits over the vehicle’s hub.
-
57.1 mm
Thread Size
The size and spacing of the threads on the bolts or nuts that hold the wheel in place.
-
M14 x 1.5
Rim Diameter
The wheel diameter in inches that determines which tire sizes will fit.
-
18"
Rim Width
The distance between the inner edges of the wheel is measured in inches.
-
8.0"
Wheel Offset
How far the wheel sits inward or outward relative to the hub mounting surface.
-
48 mm
Backspacing
Shows how much space the wheel takes up toward the inside of the vehicle.
-
-
Wheel Fasteners
The type of hardware used to secure the wheel to the vehicle.
-
-
Compare Tires
Specification
Wheels from
Installed on
Result (Click it)
Section Width
The width of the tire from sidewall to sidewall, measured in millimeters.
-
-
Aspect Ratio
The height of the tire’s sidewall expressed as a percentage of its width.
-
-
Diameter
The wheel diameter for which the tire is designed to fit.
-
-
Tire Pressure
The recommended air pressure for safe and efficient driving.
-
-
Overall Diameter
The total height of the tire and wheel combined affects clearance and speedometer accuracy.
-
-
Wheel Fitment Parts for the 2003 Audi S8
Example products matched to recorded thread, hub, or spacer dimensions. They are not verified fits. Confirm seat style, thickness, and clearance before ordering.
As an Amazon Associate we earn from qualifying purchases. Product availability and pricing may change.
2003 Audi S8 Wheel Fitment and Specs
This page summarizes the known baseline wheel and tire specifications for the 2003 Audi S8. Use these as a reference point when comparing donor wheels or choosing aftermarket options. If a value is not listed or varies by trim or market, verify it with the on-page calculator and your owner’s manual, door-jamb placard, or an Audi dealer by VIN.
Specification
2003 Audi S8
Bolt pattern
5x112
Center bore
57.1 mm
Thread size
M14 x 1.5
OEM rim diameter
18 in
OEM rim width
8.0 in
OEM wheel offset (ET)
48 mm
Backspacing
5.89 in
OEM tire size
245/45R18
Other factory or regional wheel and tire packages may exist. If your S8 has different equipment, confirm exact specs with OEM sources and use the calculator on this page to quantify any differences.
How to use the Wheel Interchange Calculator
Set Installed on to 2003 Audi S8. This is your baseline.
Set Wheels from to the donor vehicle you are evaluating. This shows how that setup compares against your S8.
Use Custom wheel size to try alternate rim width, diameter, and offset. The tool will show inner clearance and outer poke changes compared to the S8 baseline.
Use Custom tire size to adjust section width and aspect ratio. When you change rim diameter, the displayed tire diameter comparison updates so you can keep overall diameter close to stock.
Review results carefully:
Inner clearance change: Negative means closer to suspension or brakes.
Outer position change: Positive means farther out toward the fender.
Overall tire diameter difference: Keep close to stock to help maintain speedometer and ABS behavior.
Always physically test fit and turn lock to lock. Check clearance at the strut, spring perch, control arms, brake calipers, inner liner, and fender lips under compression.
Fitment guidelines for the 2003 S8
Bolt pattern must be 5x112. Do not use wobble hardware to force fit different PCDs.
Center bore is 57.1 mm. A larger aftermarket center bore can be used only with proper 57.1 mm hub-centric rings. A smaller bore will not fit.
Fasteners must match thread M14 x 1.5. Verify the fastener seat type required by your wheels and do not mix seat styles.
Offset: The OEM wheel is ET 48 on 8.0 in width. Use the calculator to see how any offset change affects inner and outer clearance. Keep inner clearance safe for struts and brakes and avoid pushing the outer edge into the fender.
Width changes: Increasing width pushes edges outward and inward relative to centerline. The calculator shows exactly how much on each side so you can judge clearance.
Tire sizing: Keep overall diameter close to the OEM 245/45R18 baseline. Larger diameters can rub on compression. Smaller diameters reduce ground clearance.
Load rating: Wheels and tires must meet or exceed the vehicle’s load requirements. Check stamped or published ratings before purchase.
TPMS: If your vehicle is equipped with tire pressure monitoring, confirm sensor compatibility and mounting method for any new wheel.
Brake and caliper clearance checks
Spoke-to-caliper clearance varies by wheel design even at the same diameter and offset. Do not assume fitment based on size alone.
If available, use a brake template from the wheel maker. Otherwise, test fit a bare wheel and spin the hub to confirm radial and axial clearance.
Account for wheel weights and balance clips so they do not contact calipers or knuckles.
Hardware and installation notes
Use hub-centric rings when the aftermarket wheel bore is larger than 57.1 mm to prevent vibration.
Fastener length must provide full thread engagement. If you add spacers, you will need appropriately longer hardware. Verify seat style and shank length with the wheel and spacer manufacturer.
Tighten fasteners in a star pattern with a quality torque wrench to the OEM specification listed in your owner’s manual. Re-torque after 50 to 100 miles.
Clean the hub face and wheel mounting pad. Remove corrosion and debris to ensure proper seating and runout.
How to verify OEM data for your specific S8
Check the driver door-jamb tire and loading placard for tire size and pressure.
Consult the owner’s manual or Audi service literature for wheel specifications and torque values.
Call an Audi dealer with your VIN for exact build information.
Use the calculator on this page to compare any alternative wheel or tire against the known baseline listed above.
Wheel and tire fitment affects steering, braking, and stability. Use the calculator to quantify changes, verify with OEM sources, and always perform a careful test fit. If you are unsure, consult a qualified technician.
Methodology and sources
Wheel interchange depends on more than bolt pattern. Where data is available, this site compares recorded OEM values:
Bolt pattern / PCD
Center bore direction (donor wheel bore must not be smaller than the hub)
Wheel diameter, width, and offset against known OEM ranges
A normal wheel spacer does not change bolt pattern. Hub rings cannot enlarge a wheel bore that is smaller than the hub. Brake clearance and tire package fitment still require vehicle-specific checks when not confirmed in the dataset.
