Recorded OEM specifications for the 2009 Audi S8, donor years with overlapping ranges, and a calculator to compare a selected wheel. Range overlap is not a guaranteed fit.
Baseline mounting dimensions used for interchange decisions.
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.
These are vehicle-year records whose recorded OEM ranges overlap this 2009 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.
Years grouped because recorded compatibility evidence is equivalent. Each year keeps its own page.
Approximate position vs the mid OEM package: outer change -2.85 mm, inner change -9.85 mm. This uses aggregated width/offset ranges, not a specific wheel.
Years grouped because recorded compatibility evidence is equivalent. Each year keeps its own page.
Dataset suggestionHub-centric rings ≈ 66.5 → 57.1 mm – not a verified installation requirement.
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.
Years grouped because recorded compatibility evidence is equivalent. Each year keeps its own page.
Dataset suggestionHub-centric rings ≈ 66.5 → 57.1 mm – not a verified installation requirement.
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 -1.85 mm, inner change -10.85 mm. This uses aggregated width/offset ranges, not a specific wheel.
Dataset suggestionHub-centric rings ≈ 66.5 → 57.1 mm – not a verified installation requirement.
Wheel width/offset data is incomplete. Hub ring 66.5 → 57.1 mm may apply if mounting dimensions are otherwise compatible.
Years grouped because recorded compatibility evidence is equivalent. Each year keeps its own page.
Approximate position vs the mid OEM package: outer change -2.85 mm, inner change -9.85 mm. This uses aggregated width/offset ranges, not a specific wheel.
Years grouped because recorded compatibility evidence is equivalent. Each year keeps its own page.
Approximate position vs the mid OEM package: outer change -5.85 mm, inner change -6.85 mm. This uses aggregated width/offset ranges, not a specific wheel.
Only years with evidence-based interchange relationships are listed. Adjacent years are not assumed compatible.
Compare a donor vehicle or custom wheel against this 2009 Audi S8. Use Compare in calculator on a donor row above to fill the donor side of this same calculator.
Compare wheel compatibility between two vehicles
2009 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.
M14 x 1.5
M14 x 1.5 · Thread match only; seat style is not verified
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M14 x 1.5 · Thread match only; seat style is not verified
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M14 x 1.5 · Thread match only; seat style is not verified
View on Amazon →Vehicle hub 57.1 mm
OD 66.5 mm · ID 57.1 mm
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OD 66.5 mm · ID 57.1 mm
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OD 66.5 mm · ID 57.1 mm
View on Amazon →As an Amazon Associate we earn from qualifying purchases. Product availability and pricing may change.
Start from the factory spec and make small, measured changes. Use the wheelinterchange.com calculator to compare any donor wheel or custom size against your S8. Keep overall tire diameter close to the OEM tire to protect speedometer accuracy and driver aids. Maintain hub centering on 57.1 mm. Verify brake and fender clearance before mounting tires. If anything is unknown, confirm it with the calculator and your OEM documentation.
Offset changes move the wheel in or out. More positive ET tucks the wheel inboard. Less positive ET pushes it outward. Inboard moves risk suspension and liner contact under compression. Outboard moves risk fender or arch contact on bumps and turns. The calculator shows these shifts in millimeters so you can visualize the change.
Wider rims add tire section width and bulge depending on tire choice. Inner clearance to struts and control arms is the usual limit. Outer clearance to the fender lip is the next constraint. The calculator compares inner and outer positions versus OEM, which helps you gauge safe room.
Tire outside diameter affects speedometer, gearing feel, and ABS stability tuning. The calculator updates tire diameter when you change rim diameter, so you can keep total diameter close to stock. That preserves handling balance and avoids false ABS or stability events.
Your hub bore is 57.1 mm. Aftermarket wheels with larger bores need 57.1 rings to stay hubcentric. Smaller bores do not fit. Thread size is M14 x 1.5. Lug seat type can vary by wheel, so match the seat to the wheel design. Mismatched seats can loosen and cause vibration.
| Spec | Value |
|---|---|
| Bolt pattern | 5x112 |
| Center bore | 57.1 mm |
| Thread size | M14 x 1.5 |
| Rim size | 20 x 9.0 in |
| Wheel offset | ET45 |
| Backspacing | 6.27 in |
| Tire size | 265/35R20 |
If any value differs by trim or region, use the calculator and OEM sources to confirm before purchase. Small, verified changes reduce risk and keep the S8 driving as intended.
Wheel interchange depends on more than bolt pattern. Where data is available, this site compares recorded OEM values:
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.
