OEM wheel and tire fitment specs for the 2018 Audi S6, including bolt pattern (PCD), center bore diameter, thread size, rim diameter, rim width, wheel offset, and backspacing.
Recorded OEM specifications for the 2018 Audi S6, 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.
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 2018 Audi S6. Overlap is not a guarantee that a specific wheel will install. Selected-wheel comparison is in the calculator below.
Evaluated 97 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)
Approximate position vs the mid OEM package: outer change -3.18 mm, inner change -3.18 mm. This uses aggregated width/offset ranges, not a specific wheel.
Wheel geometryOEM width/offset ranges overlap (not a specific wheel)
Center-bore records disagree (donor year-level hub 66.6 mm vs trim range 66.5–66.5 mm). Unqualified overlap is not claimed until the conflict is resolved. Approximate position vs the mid OEM package: outer change 7.18 mm, inner change -0.83 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 -3.18 mm, inner change -3.18 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 1.83 mm, inner change -8.18 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 -0.17 mm, inner change -6.18 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 -1.17 mm, inner change -5.18 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 -1.17 mm, inner change -5.18 mm. This uses aggregated width/offset ranges, not a specific wheel.
Audi S6 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 2018 Audi S6. 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:
2018 Audi S6
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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66.5 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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19"
Rim Width
The distance between the inner edges of the wheel is measured in inches.
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8.5"
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.
-
-
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 2018 Audi S6
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.
2018 Audi S6 wheel fitment and interchange guide | wheelinterchange.com
Factory specs you can trust
Spec
2018 Audi S6 (OEM known)
Bolt pattern
5x112
Center bore
66.5 mm
Thread size
M14 x 1.5
Wheel size
19 x 8.5 in
Offset
ET45
Backspacing
6.02 in
Tire size
255/40R19
tl;dr
Match 5x112, and a 66.5 mm hub. M14x1.5 hardware.
Use the calculator to compare donor wheels to your S6.
Keep overall tire diameter close to stock for clean fit.
Offset and width changes affect inner and outer clearance.
Confirm brake caliper clearance before buying or mounting.
Recommendation
Plan the target setup
Decide if you want looks, grip, or comfort first. Use the on-page calculator to keep overall tire diameter near stock. That helps speedometer accuracy and fender clearance.
Confirm core compatibility
Bolt pattern must be 5x112. Do not force-fit adapters.
Center bore must seat on 66.5 mm. A larger wheel bore needs hub-centric rings. A smaller bore will not fit without machining.
Thread size is M14x1.5. Match the seat style to the wheel design. Audi OEM typically uses bolts, not studs.
Evaluate width and offset
Enter the donor wheel size in the calculator. Then enter your current S6 setup. Watch inner clearance to the strut and knuckle. Watch outer poke relative to the fender edge. Small offset changes move the wheel a lot on this chassis. Treat the calculator’s inner and outer change values as your guardrails.
Check brake and spoke clearance
The S6 has large factory brakes. Ask the wheel maker for a brake template or test-fit bare wheels. Spoke design can make or break caliper clearance even if width and offset look fine on paper.
Select tires to match the wheel
Use the custom tire size fields in the calculator. Keep overall diameter close to the stock 255/40R19 value. Verify section width clearance on both the inner and outer sides. More width is not always faster if it rubs under load.
Hardware and accessories
Use M14x1.5 bolts with the correct seat type for your wheel.
If using spacers, they must be 5x112 and hub-centric to 66.5 mm. Confirm bolt length and thread engagement.
Use hub-centric rings if the wheel bore is larger than 66.5 mm.
Impact
Tire diameter changes affect speedometer, gearing feel, and fender gap.
Offset changes affect scrub radius, steering feel, and bearing load.
Wheel width changes inner clearance and outer poke under compression.
Center bore mismatch causes vibration unless corrected with proper rings.
Heavier wheels increase unsprung mass and can lengthen stopping distances.
Risks
Rubbing under compression or steering lock if diameter or width grows too much.
Caliper contact from concave faces or tight spoke barrels.
Vibration from off-center mounting if hub-centricity is not maintained.
Hardware mismatch. Wrong seat type or bolt length can loosen or damage hubs.
TPMS behavior varies by trim and market. Sensors or reset procedures may differ. Confirm with your owner’s manual or dealer.
Next actions
Checklist
Open the calculator. Set Wheels from to your donor or custom size.
Set Installed on to 2018 Audi S6 with the factory size above.
Tune width and offset until inner and outer clearance changes look reasonable.
Adjust tire size to keep overall diameter near stock.
Confirm center bore is 66.5 mm or plan for proper hub rings.
Verify M14x1.5 bolt seat style and length with the wheel supplier.
Request a brake template or perform a clean test-fit before mounting tires.
After install, road test, then re-check torque and clearances.
Some aftermarket wheels list 66.6 mm bores. Verify ring sizing with the seller.
Backspacing and offset are two views of the same geometry. Use both in the calculator to sanity-check results.
Do not rely on generic lug torque charts. Follow your Audi documentation.
If the wheel maker cannot prove brake clearance, do not assume it will fit.
If any values above vary by trim for your S6, confirm with the on-page calculator presets and your OEM sources. When in doubt, measure on the car and get confirmation in writing from the wheel supplier.
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.
