OEM wheel and tire fitment specs for the 2009 Audi S4, including bolt pattern (PCD), center bore diameter, thread size, rim diameter, rim width, wheel offset, and backspacing.
Recorded OEM specifications for the 2009 Audi S4, donor years with overlapping ranges, and a calculator to compare a selected wheel. Range overlap is not a guaranteed fit.
Multiple OEM configurations exist for this vehicle. Fitment can vary by trim, brakes, and factory wheel package – confirm your exact setup before buying.
Center-bore records disagree: year-level hub 66.6 mm vs trim range 57.1–66.5 mm. Interchange below does not treat this as an unqualified match.
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 2009 Audi S4. Overlap is not a guarantee that a specific wheel will install. Selected-wheel comparison is in the calculator below.
Evaluated 320 donor years. Listed 24 eligible overlaps (not all evaluated years are compatible). Showing all listed.
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 -0.17 mm, inner change -6.18 mm. This uses aggregated width/offset ranges, not a specific wheel.
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.
Wheel geometryOEM width/offset ranges overlap (not a specific wheel)
Center-bore records disagree (target year-level hub 66.6 mm vs trim range 57.1–66.5 mm; donor year-level hub 66.6 mm vs trim range 57.1–57.1 mm). Unqualified overlap is not claimed until the conflict is resolved. Approximate position vs the mid OEM package: outer change -0.17 mm, inner change -6.18 mm. This uses aggregated width/offset ranges, not a specific wheel.
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 -1.17 mm, inner change -5.18 mm. This uses aggregated width/offset ranges, not a specific wheel.
Audi S4 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 2009 Audi S4. 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:
2009 Audi S4
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.
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5x112
Center Bore
The hole in the center of the wheel that fits over the vehicle’s hub.
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57.1 mm
Thread Size
The size and spacing of the threads on the bolts or nuts that hold the wheel in place.
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M14 x 1.5
Rim Diameter
The wheel diameter in inches that determines which tire sizes will fit.
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18"
Rim Width
The distance between the inner edges of the wheel is measured in inches.
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8.0"
Wheel Offset
How far the wheel sits inward or outward relative to the hub mounting surface.
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45 mm
Backspacing
Shows how much space the wheel takes up toward the inside of the vehicle.
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-
Wheel Fasteners
The type of hardware used to secure the wheel to the vehicle.
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-
Compare Tires
Specification
Wheels from
Installed on
Result (Click it)
Section Width
The width of the tire from sidewall to sidewall, measured in millimeters.
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-
Aspect Ratio
The height of the tire’s sidewall expressed as a percentage of its width.
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Diameter
The wheel diameter for which the tire is designed to fit.
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Tire Pressure
The recommended air pressure for safe and efficient driving.
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Overall Diameter
The total height of the tire and wheel combined affects clearance and speedometer accuracy.
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-
Wheel Fitment Parts for the 2009 Audi S4
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.
2009 Audi S4 Wheel Fitment Guide
This page compiles the known factory wheel and tire specs for the 2009 Audi S4 and explains how to use the on-page calculator to check interchangeability and custom sizes safely. If a value is not listed here or varies by trim, confirm it with your VIN using OEM sources and the calculator before purchasing.
Known OEM Fitment Specs
Bolt pattern
5x112
Center bore
66.6 mm
Thread size
M14 x 1.5
Rim size
18 x 8.0 in
Wheel offset (ET)
45 mm
Backspacing
5.77 in
Tire size
235/40R18
Notes:
Bolt pattern 5x112 means 5 wheel bolts on a 112 mm circle.
Audi typically uses wheel bolts rather than nuts. The thread size above is the bolt spec. Always match the bolt seat type to the wheel design. If seat type is not known, check the wheel manufacturer documentation or your OEM parts catalog.
If your trim has larger brakes or a special package, confirm spoke and barrel clearance with the calculator and a physical test fit.
How to Use the Wheel Interchange Calculator
The calculator lets you compare a donor wheel and tire to your 2009 Audi S4. It updates overall tire diameter as you change rim diameter, so you can visualize fit and speedometer impact.
Basic comparison
Set “Installed on” to your vehicle and load the known OEM spec above if not prefilled.
Enter the donor wheel and tire specs under “Wheels from.” If you do not know the donor offset or center bore, get them from the wheel maker or an OEM catalog for that donor vehicle.
Custom wheel and tire sizing
Open “Custom wheel size” to adjust rim diameter, width, and offset. The tool will show inner clearance change and how far the wheel face moves outward.
Open “Custom tire size” to change section width and aspect ratio. The calculator updates tire diameter automatically when you change rim diameter.
Aim to keep overall tire diameter close to stock and ensure there is sufficient inner and outer clearance. Check both static and full-lock steering positions and suspension compression.
What to watch in the results
Inner clearance to strut, spring perch, and liners.
Outer “poke” relative to fender lips and arch liners.
Brake caliper and spoke clearance. Barrel and spoke shapes vary by wheel design, so verify physically when possible.
Speedometer change and ground clearance changes due to tire diameter differences.
Safety and Compatibility Checklist
Center bore 66.6 mm. The wheel’s center bore must be equal to or larger than 66.6 mm. If larger, use quality hub-centric rings sized to your wheel’s bore down to 66.6 mm. Do not force a smaller bore onto the hub.
Bolt pattern 5x112 only. Patterns like 5x114.3 will not fit safely.
Thread size M14x1.5. Use correct-length, correct-seat bolts for the wheel design. If unknown, consult the wheel manufacturer.
Load rating. Wheel and tire load ratings must meet or exceed the Audi S4 requirements for your market and trim. Confirm via OEM documentation or the tire and wheel technical sheets.
TPMS. System type and sensor frequency can vary by market and build. Reuse compatible sensors or program new ones per OEM specs. If unsure, check your owner’s manual or dealer by VIN.
Brakes. Some trims or markets may have different rotor and caliper sizes. Always verify spoke and barrel clearance with the calculator and a test fit.
Understanding Offset and Backspacing
Offset ET45 means the mounting pad is 45 mm toward the street side from the wheel centerline. Increasing offset moves the wheel inward. Decreasing offset moves it outward. Backspacing 5.77 in is the distance from the hub mounting pad to the inner wheel lip. Use the calculator to visualize how changing offset and width alters inner clearance and outer poke.
Popular Change Scenarios
Upsizing to 19 inch
You can evaluate 19 inch options by setting a 19 inch rim in the calculator, then choosing a tire size that keeps the overall diameter close to stock. Confirm inner clearance, fender clearance, and speedometer change. Check brake clearance on the actual wheel.
Wider wheels for more grip
Increasing width changes both inner and outer positions. Use the calculator to balance offset so the inner edge clears suspension while the outer edge remains within the fender. Then choose a tire width and aspect ratio that maintains adequate clearance and proper load index.
Install Tips
Clean the hub face and center spigot. Remove rust and debris for proper seating.
If using hub-centric rings, seat them fully on the hub or wheel per the ring design.
Hand start bolts to avoid cross-threading. Tighten in a star pattern.
Use the factory wheel bolt torque from your owner’s manual. If you do not have it, contact an Audi dealer with your VIN.
Recheck bolt torque after initial driving on new wheels.
How to Confirm Any Missing Specs
Use the calculator on this page to load your 2009 Audi S4 and compare candidate wheels and tires.
Check your owner’s manual and the OEM parts catalog using your VIN for wheel, tire, TPMS, and brake details.
Ask the wheel manufacturer for exact offset, width, center bore, and seat type for the specific part number you plan to buy.
Always verify tool and part compatibility with your exact wheel and vehicle configuration.
Summary
Your 2009 Audi S4 is known to use a 5x112 bolt pattern, 66.6 mm center bore, M14x1.5 wheel bolts, and commonly an 18x8 ET45 wheel with 235/40R18 tires. Before purchasing or installing different wheels or tires, use the calculator to compare dimensions, confirm brake and fender clearance, and verify any unknown values with OEM sources. Do not assume compatibility without measurements and documentation.
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.
