2020 Audi S6 Wheel Fitment Guide | wheelinterchange.com

1) Starting point

When I first set up a 2020 Audi S6 for a clean wheel change, I started with a simple mental model. Think of it as two questions: will the wheel mount correctly, and will it clear everything in motion. Mounting depends on bolt pattern, center bore, and hardware. Clearing depends on diameter, width, and offset working together with your tires and brakes. With this car, I found that beginning from the known OEM numbers kept decisions calm and straightforward.

Known OEM fitment for 2020 Audi S6

If any values on your car differ by trim or package, that can happen. I like to confirm by checking the tire placard on the driver door jamb, the OEM wheel stamps inside the spokes, and the on-page calculator here to mirror the setup I see on the car.

2) Small win

The easiest early success is matching OEM-equivalent specs. That means a wheel with 5x112, a 66.5 mm hub bore or a larger bore with the right ring, M14 x 1.5 compatible hardware, and dimensions near 20 x 8.5 ET43 with a 255/40R20 tire. Using like-for-like parts keeps alignment behavior familiar and helps preserve clearance to the strut and fender.

Here is how I lock that in using the calculator:

• Set “Installed on (your vehicle)” to 2020 Audi S6.
• Enter a “Custom wheel size” of 20 x 8.5 with offset 43.
• Enter a “Custom tire size” of 255 section width and 40 aspect ratio.
• Use the stock values as your baseline, then compare any potential wheel in the “Wheels from (donor vehicle)” panel.

The small win is seeing zero or minimal change in inner clearance and outer poke in the comparison. That tells me the new wheel should mount like stock, which builds confidence before I experiment.

3) Expand scope

Once the baseline feels clear, I widen the scope. The rule of thumb I use: width and offset decide where the barrel and face sit; diameter and tire profile decide rolling size and sidewall feel. Think of it as a slide-and-stretch puzzle. Adding wheel width pushes both inward and outward by half the width change, while offset acts like a front-to-back slider.

Try this in the calculator:

• Increase width from 8.5 to 9.0 inches. Notice the inner clearance change in millimeters.
• Adjust offset up or down to bring inner clearance back toward stock if needed.
• Watch how “outer poke” moves relative to the fender line in the comparison.
• Change rim diameter. The tool updates the compared tire diameter so you can keep overall diameter close to stock if desired.

I like keeping overall tire diameter in a tight range for speedometer accuracy and suspension geometry feel. The calculator’s diameter delta display makes that simple to judge at a glance. Brake size may vary by trim and package, so if you simulate downsizing in diameter, I suggest using the comparison to evaluate clearance and then visually checking your calipers during test fit.

4) Refine

Fine-tuning is where small details help the S6 feel right. My mental model here is mount, center, seat, and spin.

• Mount: 5x112 pattern is required for proper alignment to the hub. The thread size is M14 x 1.5. Hardware on European platforms can be bolt based or stud converted in the aftermarket, so I confirm what is on the car and match length and seat type accordingly.
• Center: the S6 hub bore is 66.5 mm. If a wheel has a larger bore, I use hub-centric rings sized to 66.5 mm to keep the wheel centered smoothly.
• Seat: wheel seat type may vary by wheel brand. I visually confirm whether the seat is ball or conical and match the hardware. This prevents seating issues and vibration.
• Spin: I look at inner barrel-to-caliper clearance and fender-to-tire clearance at full lock and compression. The calculator’s inner clearance and poke outputs guide me before I test fit.

If spacers are part of your plan, I treat spacer thickness as a precise dimension. I simulate the spacer by reducing offset by the same millimeter amount in the calculator, then validate hardware engagement and fender coverage during mock-up. For torque values and load ratings, I reference the owner’s manual and wheel manufacturer data rather than guessing.

5) Validate

Before calling a setup complete, I like a short checklist backed by OEM sources:

• Verify tire size and load index from the driver door placard and match your chosen tires.
• Read wheel markings inside the spokes to confirm diameter, width, and offset numbers match your plan.
• Use the calculator here to compare “donor” wheels against your S6. Keep an eye on inner clearance and outer poke.
• Confirm hardware thread size M14 x 1.5 and seat profile match the wheel. Check engagement depth visually.
• Hand-fit one front and one rear wheel. Spin the wheel by hand to check barrel-to-caliper clearance and inspect fender liners at lock.
• Torque in a star pattern to the value specified in your owner’s manual, and recheck torque after a short drive.

If anything seems uncertain, I cross-check at the dealership parts counter using the VIN, or I reference the original wheel part number stamped on the inside for exact ET and size data.

Helpful tools

• Torque wrench 1/2 inch drive
• M14x1.5 wheel hanger/guide pin
• 66.5 hub-centric rings
• Digital caliper for measuring hub bores

6) Summary

Quick recap: start from the 2020 Audi S6 baseline of 5x112, 66.5 mm center bore, M14 x 1.5 hardware, and the stock 20 x 8.5 ET43 with 255/40R20. Use that as your comparison anchor in the calculator. Expand thoughtfully by adjusting width and offset while watching inner clearance and outer poke. Refine the details with proper hub centering and matching hardware seats. Validate with OEM markings, the door placard, and a careful test fit. With that step-by-step progression, picking wheels for the S6 becomes clear, confident, and repeatable.