2018 Audi A6 Wheel Interchange

2018 Audi A6 Wheel Interchange, Sizes, and Fitment Guide

Known OEM Fitment For 2018 Audi A6

Use the data below as a starting point. Audi offered multiple wheel and tire packages on the 2018 A6, so specifications can vary by trim and brake package. Always confirm your exact setup using the tire placard in the driver door jamb, your owner manual, and the calculator on this page.

If your A6 trim is different, enter your exact wheel and tire into the comparison calculator below and confirm against OEM sources.

How To Use The Wheel Interchange Calculator

The calculator lets you compare a donor wheel and tire against your Audi A6 to predict clearance, diameter change, and speedometer impact.

• Wheels from - Enter the donor vehicle wheel and tire, or manually type the wheel and tire you want to try.
• Installed on - Select 2018 Audi A6. If you know your current wheel and tire, enter those as your baseline.
• Custom wheel size - Adjust rim diameter, width, and offset. The tool will update inner and outer clearance relative to suspension, fenders, and brakes.
• Custom tire size - Adjust section width and aspect ratio. When you change rim diameter, the calculator updates overall tire diameter in the comparison so you can keep it close to stock.
• What to look for - Keep overall tire diameter within about 1 to 3 percent of your stock size, maintain inner clearance from strut and control arms, and avoid pushing the outer edge past the fender.

Tip: If you have mixed data, such as a 19 inch wheel example and an 18 inch tire example, treat them as different OEM packages. Use your door placard as the source of truth, then try alternatives in the calculator.

Fitment Checklist Before You Buy

• Bolt pattern - Must be 5x112.
• Center bore - Your hub is 66.6 mm. Larger-bore wheels require 66.6-specific hub-centric rings. Smaller bores will not seat.
• Offset and backspacing - Start from the OEM example ET 45 mm and use the calculator to test inner and outer clearance. Changes as small as 3 to 5 mm can be noticeable.
• Brake clearance - Spoke design matters as much as diameter. Test fit to ensure caliper clearance.
• Tire diameter - Keep overall diameter close to stock to protect ABS and speedometer accuracy. Use the calculator to check percent difference.
• Load rating - Wheels and tires must meet or exceed the vehicle’s GAWR and load index from your door placard.
• Lug hardware - Thread is M14 x 1.5. Match seat type to the wheel. Length must account for any spacers.
• TPMS - If your car uses direct sensors, move or program them as required. If it uses an indirect system, follow the reset procedure in the manual.

Plus Sizing And Common Upgrades

The A6 platform often supports plus sizing when done carefully. Use these principles rather than assuming any size will fit:

• Plus one - Increase wheel diameter by 1 inch and choose a tire with a lower aspect ratio so overall diameter stays within about 1 to 3 percent of stock. Example concept only: a 245 section tire may drop aspect ratio when moving from 18 to 19 inch. Verify in the calculator.
• Width changes - Going wider can improve grip but reduces inner clearance. Each additional 0.5 inch of wheel width moves the inner and outer edges by about 6.35 mm before offset changes.
• Offset tuning - A lower ET pushes the wheel out. A higher ET pulls it in. Use the calculator to balance fender flushness against strut and control arm clearance.
• Spacers - Only if needed to clear brakes or achieve stance, and only with proper hub-centric spacers and longer, correct-seat hardware.

Do not rely on visual guesses. Confirm with measurements, the calculator, and a physical test fit whenever possible.

Installation Tips

• Test fit first - Mount one wheel without a tire to check caliper clearance and hub seating.
• Clean mating surfaces - Remove rust and debris from the hub face and wheel mounting pad for proper torque and no vibration.
• Hub-centric rings - If using larger-bore aftermarket wheels, install 66.6 mm rings before mounting. Rings must seat fully.
• Mounting - Hand start all fasteners. If your car uses lug bolts, a wheel hanger tool can help align the wheel.
• Tightening - Snug in a star pattern, lower the car, then torque to the factory specification from your owner manual using a calibrated torque wrench. Do not lubricate threads unless the manufacturer specifically instructs it.
• After install - Re-torque after 50 to 100 miles. Check for rubbing at full lock and over bumps.
• TPMS - Transfer and seal sensors correctly or perform the reset procedure as directed by Audi service information.

Tools And Helpful Supplies

• 1/2 inch automotive torque wrench - For accurate tightening to the factory spec.
• M14 x 1.5 wheel hanger tool - Helps align wheels on vehicles that use lug bolts.
• Thin wall lug socket set - Prevents scratching wheels with tight lug bores.
• 66.6 mm hub-centric rings - For wheels with larger center bores to ensure hub-centric fit.

FAQs

• What is the bolt pattern for the 2018 Audi A6?

  5x112.

• What center bore do I need?

  66.6 mm. Larger-bore wheels can be used with 66.6 mm hub-centric rings. Smaller bores will not fit.

• What lug thread size does it use?

  M14 x 1.5. Also verify the lug seat style that matches your wheel.

• Will 19 inch wheels fit my 2018 A6?

  Some 2018 A6 packages used 19 x 8.5 ET 45 wheels. Fitment still depends on your brakes, tire choice, and offset. Use the calculator with your exact trim and confirm clearances and tire diameter against your OEM references.

• Can I run a wheel with a 66.1 mm or 66.5 mm bore?

  No. The bore must be at least 66.6 mm. If it is larger than 66.6 mm, use hub-centric rings to 66.6. If it is smaller, it will not seat on the hub.

• What offset should I choose?

  The provided OEM example is ET 45 mm. Small changes can be workable, but always model inner and outer clearance with the calculator and verify with a test fit.

• How close should my new tire diameter be to stock?

  As a general guideline, keep overall diameter within about 1 to 3 percent of your stock size. Use the calculator to check the exact percentage and speedometer change.

• Do I need new lug hardware or spacers?

  Only if required by the wheel design or to achieve clearance. If spacers are used, they must be hub-centric and you must use correct-seat hardware with proper thread engagement.

• Why does my backspacing not match the offset math exactly?

  Published backspacing can vary due to measurement method and rim flange thickness. Use the calculator for a geometry check and measure your actual wheel when possible.

• How do I confirm my factory size?

  Check the driver door jamb tire placard, the owner manual, and Audi parts information using your VIN. Then use those values as your baseline in the calculator.

Disclaimer: Do not rely on a single data point for fitment decisions. Verify dimensions with the on-page calculator, your OEM documentation, and a physical test fit before driving.