2017 Audi S8 Wheel Interchange

2017 Audi S8 Wheel Fitment Guide

Known OEM Fitment For 2017 Audi S8

The following specifications are from the provided OEM data for the 2017 Audi S8. If your vehicle has a different trim or a special package, confirm each value against your owner’s manual or an Audi parts catalog, and use the on-page calculator to compare any wheel or tire change before purchase.

Unknowns or variations: Some specifications can vary by market or package. If anything on your car differs from the table, measure and verify. For example, confirm brake clearance and wheel offset against your actual calipers and fenders using the calculator and a physical check.

How To Use The Wheel Interchange Calculator

The calculator on wheelinterchange.com lets you compare a donor setup against your S8. It also lets you try custom rim and tire sizes and immediately see how overall tire diameter and clearances change.

• Step 1. In Wheels from (donor vehicle), enter the donor wheel and tire. If you are starting from your stock S8, use 21x9 ET35 with 275/35R21.
• Step 2. In Installed on (your vehicle), select 2017 Audi S8 and confirm the OEM data matches your car. If it does not, measure your current wheel to confirm width, offset, and tire size.
• Step 3. Use Custom wheel size to test a new rim diameter, width, and offset. The tool will calculate inner clearance change and outer poke change relative to your baseline.
• Step 4. Use Custom tire size to change section width and aspect ratio. Changing rim diameter updates tire diameter so you can keep overall diameter close to stock for speedometer and ABS consistency.
• Step 5. Review results for:
  • Inner clearance to suspension and brake components.
  • Outer poke relative to the fender lip.
  • Overall tire diameter change compared to stock.
• Step 6. Before buying, confirm with a physical test fit or a brake template from the wheel manufacturer if brake clearance is close.

Fitment Checklist Before You Buy

• Bolt pattern and hub: 5x112 and 66.6 mm center bore. If the aftermarket wheel bore is larger, use hub-centric rings sized to 66.6 mm at the hub side.
• Thread and seat: M14 x 1.5 hardware. Match the seat type of the bolts to the wheel seat design. Do not mix ball-seat and cone-seat hardware.
• Offset and backspacing: Compare ET to OEM ET35. Use the calculator to see inner clearance and outer poke changes. Verify fender and liner clearance at full lock and full compression.
• Brake caliper clearance: Large S8 brakes require adequate spoke and barrel clearance. Request a brake template from the wheel maker when in doubt.
• Load rating: Ensure the wheel and tire load index meet or exceed Audi’s requirements for the S8.
• Tire overall diameter: Keep close to the OEM diameter of about 28.6 in unless you have a specific reason. Large deviations can affect gearing, speedometer, ABS, and ride height.
• TPMS: System type can vary by region. Confirm whether your S8 uses indirect TPMS via ABS or requires in-wheel sensors, and plan accordingly.
• Spacers: Use only hub-centric spacers with proper extended M14x1.5 bolts. Recalculate poke and inner clearance and confirm thread engagement.
• Test fit: Always test fit the front and rear before mounting tires if clearances are tight.

Plus Sizing And Common Upgrades

The stock setup is 21x9 ET35 with 275/35R21, about 28.6 in overall diameter. Owners sometimes explore different diameters and widths. Actual compatibility depends on brake clearance, offset, and tire profile, which can vary by brand. Use the calculator plus a physical check to confirm.

• Downsizing for winter: A smaller wheel with a taller tire can improve ride and winter performance, but brake clearance is the limiting factor. Verify inner barrel and spoke clearance with a template.
• Wider tires: A modest increase in section width may improve grip. Confirm that the added width does not contact the fender lip or inner liner at full lock or compression.
• Larger diameter wheels: Visual appeal can improve, but ride quality often gets firmer and wheel weight can increase. Keep overall tire diameter close to stock using aspect ratio adjustments and verify brake clearance.
• Offset tuning: Small offset changes can improve stance. Too low an offset can cause fender rub. Too high can hit suspension or inner liners. Use the calculator to keep inner and outer changes within safe margins.

If you are unsure whether a particular 20 or 22 inch setup will clear your S8 brakes and fenders, treat it as unknown until you verify using the calculator and a physical template or trial fit.

Installation Tips

• Preparation: Park on level ground, engage park and chock wheels. Use the correct jacking points and support the car with stands.
• Clean mounting surfaces: Remove rust and debris from the hub face and wheel mounting pad so the wheel seats flush. Do not apply lubricant to the hub face or wheel mounting surface.
• Hub-centric rings: If your aftermarket wheel bore is larger than 66.6 mm, install rings sized for a 66.6 mm hub. Seat them fully before mounting the wheel.
• Fasteners: Hand-start M14 x 1.5 bolts to avoid cross-threading. Match the bolt seat to the wheel seat. Do not mix seat types.
• Torque: Tighten in a star pattern in stages. Use the manufacturer’s torque specification from your owner’s manual or service information. Re-torque after 50 to 100 miles.
• Spacers: Use hub-centric spacers only and ensure you have longer bolts with proper thread engagement. Recheck clearances with the spacer installed.
• TPMS: If your market uses in-wheel sensors, transfer or program sensors per Audi procedures, then initialize the system after installation.

Tools And Helpful Supplies

• 1/2 inch drive torque wrench: Search on Amazon
• Wheel hanger guide pin M14 x 1.5 for Audi lug bolts: Search on Amazon
• Tire pressure gauge: Search on Amazon
• Hub-centric rings for 66.6 mm hub (match outer size to your wheel bore): Search on Amazon

FAQs

• What is the OEM wheel and tire size for the 2017 Audi S8?

  From the provided data: 21x9 ET35 with 275/35R21 tires, bolt pattern 5x112, center bore 66.6 mm, and M14 x 1.5 hardware. Always verify on your vehicle in case of package differences.

• Will 20 inch wheels fit my 2017 S8?

  Fitment is not guaranteed here because brake clearance and offset vary by wheel design. Use the calculator to model the change and confirm with a brake template or test fit before buying.

• What offset range works on the S8?

  OEM is ET35 for the listed 21x9. Safe ranges depend on wheel width, spoke shape, and tire brand. Use the calculator to check inner clearance and outer poke, then verify physically on the car.

• Do I need hub-centric rings?

  Only if the aftermarket wheel has a larger bore than 66.6 mm. Rings center the wheel on the hub to reduce vibration. Choose rings with a 66.6 mm inner diameter and an outer diameter that matches your wheel bore.

• Can I run spacers on the S8?

  Yes, if needed for spoke or caliper clearance, but use hub-centric spacers and longer M14 x 1.5 bolts. Recalculate clearances with the spacer thickness and verify thread engagement and fender clearance.

• What is the correct lug bolt torque?

  This guide does not list torque values. Refer to your owner’s manual or Audi service information for the correct torque and follow it precisely.

• Will changing tire size affect my speedometer or ride height?

  Yes. Keep overall tire diameter close to the OEM value of about 28.6 in. The calculator shows diameter differences so you can choose a size that minimizes impact.

• Does my 2017 S8 use in-wheel TPMS sensors?

  System type can vary by region and build. Check your owner’s manual or scan the vehicle. If in-wheel sensors are used, plan for transfer or new sensors and programming when changing wheels.

Use the calculator on wheelinterchange.com to validate any wheel and tire changes for your 2017 Audi S8. When in doubt, measure on the car and consult OEM documentation before purchasing.