2008 Audi S8 Wheel Interchange

2008 Audi S8 Wheel Fitment Guide | wheelinterchange.com

This page lists verified factory wheel and tire specifications for the 2008 Audi S8 and explains how to evaluate interchange options using the on-page calculator. If a value is not shown or may vary by market or trim, confirm it with your owner’s manual, an Audi dealer, or the calculator comparison before buying.

Known OEM Fitment For 2008 Audi S8

Notes: Audi typically uses wheel bolts, not studs and nuts. Seat type and bolt length can vary by wheel, so visually confirm the seat type on your wheel and check the owner’s manual or parts catalog before purchasing hardware. Torque specification is not listed here; use the owner’s manual or OEM service information.

How To Use The Wheel Interchange Calculator

• In Wheels from (donor vehicle), enter the wheel and tire specs you are considering. You can also type a custom wheel size and custom tire size.
• In Installed on (your vehicle), select 2008 Audi S8 or enter the OEM specs above.
• Adjust custom wheel size fields for rim diameter, rim width, and offset. Adjust custom tire size for section width and aspect ratio. When you change rim diameter, the tool updates tire diameter in the comparison so you can keep overall diameter similar.
• Review inner clearance at the strut and brake, outer poke at the fender, and the percent change in overall tire diameter.
• Aim to keep overall tire diameter within about 2 to 3 percent of stock and ensure no interference at full steering lock and full suspension compression.

Fitment Checklist Before You Buy

• Bolt pattern: New wheels must be 5x112.
• Center bore: Must be 57.1 mm or larger. If larger, use hub-centric rings that reduce to 57.1 mm.
• Wheel fasteners: Thread size is M14 x 1.5. Verify bolt length and seat type that match your wheels. Do not mix ball-seat and cone-seat hardware.
• Offset and width: Compare your choice to the OEM 20x9 ET45 using the calculator to check inner clearance and outer poke.
• Brake clearance: Visually test-fit to confirm spoke-to-caliper and barrel clearance, especially with larger brakes.
• Tires: Choose a size with load index equal to or higher than OEM and keep overall diameter close to stock. Use the calculator to quantify the diameter change.
• TPMS: 2008 S8 systems vary by market. If equipped with direct sensors, plan to transfer or replace them. If indirect, you will need to reset the system after installation.
• Load rating: Wheels must meet or exceed the vehicle’s axle loads. Verify with the wheel manufacturer.

Plus Sizing And Common Upgrades

Plus sizing can improve appearance and response, but it changes clearance and ride. Use the calculator to simulate:

• Plus one or minus one changes: Keep overall tire diameter within about 2 to 3 percent of stock to preserve gearing, speedometer accuracy, and ABS behavior.
• Wider wheels and tires: Watch inner clearance to the suspension and outer fender poke. Small offset changes can make a big difference.
• AWD considerations: The S8’s quattro system prefers equal rolling diameters. If you run staggered widths, keep tire diameters the same front and rear.
• Ride and impact risk: Lower-profile tires reduce sidewall cushion. Check local road conditions before downsizing aspect ratio.

Installation Tips

• Work on a cool vehicle on level ground. Chock wheels and use a properly rated floor jack and jack stands at approved lift points.
• Loosen bolts a quarter turn before lifting. Support the car, remove bolts, and wheel.
• Clean the hub face and center pilot with a wire brush. Remove corrosion so the wheel seats flush. Lightly clean the wheel mounting pad.
• If using hub-centric rings, install them fully into the wheel bore. They must match 57.1 mm at the hub side.
• Hand-start all bolts. Use a guide pin if available to protect threads and align heavy wheels.
• Snug bolts in a star pattern. Lower the car and torque in a star pattern to the factory torque spec from your owner’s manual.
• Re-torque after 50 to 100 miles. Reset TPMS per the owner’s manual.
• Cycle steering lock-to-lock and drive over a speed bump slowly to confirm clearance under load.

Tools And Helpful Supplies

• Floor jack with rubber pad and jack stands
• 1/2 inch drive torque wrench: Search on Amazon
• Wheel hanger guide pin M14 x 1.5: Search on Amazon
• Hub-centric rings 57.1 mm ID: Search on Amazon
• Tire pressure gauge: Search on Amazon
• Breaker bar, wire brush, anti-seize for hub face (optional, use sparingly), gloves

FAQs

• What is the bolt pattern on the 2008 Audi S8?

  5x112.

• What center bore does the 2008 S8 use?

  57.1 mm. If an aftermarket wheel has a larger bore, use hub-centric rings that reduce to 57.1 mm.

• What fasteners does it use?

  M14 x 1.5 wheel bolts. Seat type and exact bolt length depend on the wheel. Verify the seat type visually and consult OEM documentation for torque.

• What are the OEM wheel and tire sizes?

  Wheel: 20x9.0 ET45 with about 6.27 in backspacing. Tire: 265/35R20.

• Will wheels from another 5x112 Audi fit my S8?

  Possibly, but you must match bolt pattern, ensure a 57.1 mm hub fit or use rings, and verify offset, width, brake clearance, and load rating. Use the calculator to compare the donor specs to the 2008 S8.

• Can I run staggered wheels on the S8?

  Keep rolling diameter the same front and rear to protect the quattro AWD system. Staggered widths are possible if overall diameters match and clearances are verified.

• What offset range works?

  Offset tolerance depends on wheel width and brake clearance. Start from the OEM ET45 20x9 and use the calculator to check inner and outer clearances for your exact wheel width and offset, then test-fit.

• Do I need new TPMS sensors?

  It depends on your vehicle’s TPMS type. Some markets used indirect systems that only need a reset; others used direct sensors that must be transferred or replaced. Check your owner’s manual.