Audi A4, S4, A5, A6 & Allroad Wheel Guide (2005-2025): Center Bore Fitment Explained

The Most Important Fitment Check: Center Bore

Before buying a replacement wheel for your Audi, the single most important specification to verify is the center bore. Audi used two different center bore sizes on these vehicles, and they are not interchangeable without modification. An incorrect center bore will prevent the wheel from mounting correctly and safely.

Decoding Audi Wheel Specifications

On the back of an OEM Audi wheel, you will find several markings cast into the metal. Understanding these will help you confirm you have the correct part.

• Part Number: Look for a 9 or 10-digit number, often starting with '8K0' or '4F0'. This is the most reliable way to identify the wheel.
• Size: You'll see a marking like '7.5Jx17'. This means the wheel is 7.5 inches wide and 17 inches in diameter.
• Offset: Look for 'ET45' or a similar number. 'ET' stands for Einpresstiefe (German for 'insertion depth'). This 45mm offset indicates how far the wheel's mounting surface is from its centerline. Using a wheel with the wrong offset can cause tire rubbing on the suspension or fenders and may increase stress on wheel bearings.
• Bolt Pattern: All vehicles covered in this guide use a 5x112 bolt pattern. This means 5 lug bolts arranged in a 112mm diameter circle.

Symptoms of a Damaged Wheel

Wheel issues can range from cosmetic flaws to serious safety concerns. Here’s what to look and listen for:

• Vibration or Shaking: A bent wheel will often cause a noticeable vibration in the steering wheel or through the seat, typically at speeds between 35-70 mph. This vibration will be constant and speed-dependent, unlike an unbalanced tire which may only vibrate at a specific speed range.
• Audible Noises: A humming, whirring, or buzzing noise that changes with vehicle speed can sometimes be mistaken for a bad wheel bearing but could be related to how a damaged wheel is interacting with the tire.
• Difficulty Balancing: If a tire shop says your wheel requires an excessive amount of weights to balance, it's a strong indicator that the wheel itself is bent.
• Slow Air Leaks: A crack in the wheel, often on the inner barrel, can cause a slow, persistent loss of tire pressure. This can also happen if a bend in the wheel prevents the tire from sealing properly against the bead.
• Visible Damage: Obvious signs include curb rash (scraping on the outer lip), peeling clear coat, corrosion, and, most seriously, visible bends or cracks.

Known Issues, Recalls, and Service Bulletins

Searches of the National Highway Traffic Safety Administration (NHTSA) database show no widespread recalls for structural failure of the factory wheels on these Audi models. Most issues are related to road hazards.

• Susceptibility to Bending: Like many modern alloy wheels paired with lower-profile tires, these Audi wheels can be prone to bending or cracking from severe pothole impacts.
• Finish Durability: In regions that use road salt during winter, the protective clear coat on the wheels can begin to peel or bubble over time. This allows moisture to reach the aluminum, causing white, powdery corrosion.
• Vibration TSB: Audi has issued general TSBs (like 44 24 80 / 2074846) that address steering wheel vibrations. While the bulletin often points to tire issues like radial force variation or flat spots, a bent wheel can cause identical symptoms and should be considered a primary suspect.

Buying a Used OEM Wheel: Inspection Guide

A used OEM wheel is often a better choice than a cheap aftermarket replica, offering superior alloy quality, durability, and perfect fitment. However, a thorough inspection is crucial.

1. Check for Cracks: This is the most important safety check. Carefully inspect the entire wheel, front and back, especially on the inner barrel (the 'back side' of the wheel). Hairline cracks can be hard to see, so use a bright light. A cracked wheel is unsafe and should not be purchased.
2. Check for Bends: Lay the wheel on a flat surface, face down. Place a straight edge across the rear lip of the wheel. Rotate the wheel and watch the gap between the straight edge and the rim. Any significant wobble or gap indicates a bend. Repeat this process with the wheel face up.
3. Look for Past Repairs: Check for signs of welding on the inner or outer barrel. A weld repair on an alloy wheel can create a weak spot. Also, look for excessive grinding marks or areas that look like they've been filled with body filler, which can hide more serious damage.
4. Assess Cosmetic Condition: Note the severity of any curb rash, scratches, or peeling clear coat. While cosmetic, these flaws can be expensive to fix. Minor curb rash can often be sanded and refinished, but deep gouges cannot.
5. Verify the Part Number: Match the part number stamped on the back of a spoke to the known compatible numbers for your vehicle to ensure correct fitment.

Wheel Finishes vs. Paint Codes

Unlike body panels, wheels do not use standard paint codes. They have specific finishes like 'Hyper Silver' or 'Gunmetal'. Matching an existing set of wheels requires visual comparison or knowing the specific Audi option code for that wheel style. If you need to find your vehicle's body paint code for other reference, it's typically located on a sticker in the trunk area, often in the spare tire well.

Cost Comparison

Prices for a single wheel can vary significantly based on the source and condition.

Frequently Asked Questions