Audi A8 3.7 quattro (2004) Bolt Pattern & Wheel Fitment
Audi A8 3.7 quattro (2004): 5x112 bolt pattern, 57.1mm center bore. Factory wheels: 18x8.5J F/R. Reference fitment ranges.
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Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Factory (OE) | 18x8.5J F/R |
| Flush Fitment | 19x9.5J at ET30 offset |
| Maximum Aggressive | 20x10.0J at ET25 offset |
How to Read Wheel Offset & Measurements
Use these two references before ordering: the left diagram shows where each spec (PCD, center bore, offset, width and diameter) is measured on the wheel; the right diagram shows how positive, zero and negative offset shift the wheel face relative to the hub centerline.
ANKUSI Engineering Expert Advice
The Audi A8 3.7 quattro's factory wheel spec reflects a deliberate balance between comfort, steering feel and durability that the engineering team tuned for. Forging lets ANKUSI match that same strength target while trimming rotational mass — the part of a wheel upgrade that actually changes how the car drives, not just how it looks.
The Audi A8 3.7 quattro runs a 5x112 bolt pattern, 57.1mm center bore, and a 18x8.5J, front and rear, wheel from the factory. Our Flush Fitment reference is 19x9.5J ET30, which tucks the tire under the fender lip on a stock-height Audi A8 3.7 quattro. Our Maximum Aggressive reference is 20x10.0J ET25 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
Audi A8 3.7 quattro OE Wheel Specs
The 2004 Audi A8 3.7 quattro (Sedan) uses a 5x112 bolt pattern with a 57.1mm center bore. Factory wheels are 18x8.5J F/R.
Why the factory spec works for most owners:
- Balances ride comfort with everyday fuel efficiency
- A widely used size in this segment, so tire and wheel availability stays strong
- Keeps unsprung weight low for stable, predictable handling
- Maintains clearance for the factory brake calipers and suspension components
ANKUSI builds these wheels — we are the forging factory, not a reseller. For the Audi A8 3.7 quattro (2004) we drill the 5x112 pattern and cut the centre bore to 57.1mm on our own CNC line, so the wheel hub-centres on the car with no spacer rings, in whatever diameter, width and offset you specify.
Converting these ET figures to backspacing? Use the wheel offset and backspacing calculator.
The figures on this page are part of our open wheel fitment dataset — 6,436 vehicles, free to download, CC BY 4.0.
Flush Fitment
For a flush look with minimal rubbing, F/R 19x9.5J ET30 is the recommended starting point on a stock or mildly lowered Audi A8 3.7 quattro.
Maximum Aggressive Fitment
F/R 20x10.0J ET25 is a more aggressive reference setup. Beyond this, expect rubbing under compression without fender rolling or camber correction.
5-Tier Configuration Options
A Factory-Style 18x8.5J ET40
Recommended setup: 18x8.5J ET40 | Economy impact: Negligible | Best for: Daily commuting, family use
Appearance: 7/10 | Comfort: 9.5/10 | Install difficulty: ★☆☆☆☆
Estimated cost: $450-800 (wheels + tires + install)
B Comfortable Upgrade 19x9.0J ET35
Recommended setup: 19x9.0J ET35 | Economy impact: -2 to -4% | Best for: Daily / street
Appearance: 8/10 | Comfort: 9/10 | Install difficulty: ★☆☆☆☆
Estimated cost: $1,950-2,550 (wheels + tires + install)
C Balanced / Flush Fit 19x9.5J ET30
Recommended setup: 19x9.5J ET30 | Economy impact: -4 to -6% | Best for: Street
Appearance: 8.5/10 | Comfort: 8/10 | Install difficulty: ★★☆☆☆
Estimated cost: $2,600-3,400 (wheels + tires + install)
D Aggressive 20x10.0J ET28
Recommended setup: 20x10.0J ET28 | Economy impact: -6 to -9% | Best for: Show / occasional track
Appearance: 9/10 | Comfort: 6.5/10 | Install difficulty: ★★★☆☆
Estimated cost: $3,900-5,000 (wheels + tires + install)
E Max Aggressive 20x10.0J ET25
Recommended setup: 20x10.0J ET25 | Economy impact: -8 to -12% | Best for: Show only
Appearance: 9.5/10 | Comfort: 4/10 | Install difficulty: ★★★★☆
Estimated cost: $4,800-6,200+ (wheels + tires + install)
Performance Comparison Matrix
| Metric | Tier A | Tier B | Tier C | Tier D | Tier E |
|---|---|---|---|---|---|
| Wheel Spec | 18x8.5J ET40 | 19x9.0J ET35 | 19x9.5J ET30 | 20x10.0J ET28 | 20x10.0J ET25 |
| Economy Impact | Negligible | -2 to -4% | -4 to -6% | -6 to -9% | -8 to -12% |
| Appearance | 7/10 | 8/10 | 8.5/10 | 9/10 | 9.5/10 |
| Comfort | 9.5/10 | 9/10 | 8/10 | 6.5/10 | 4/10 |
| Install Difficulty | ★☆☆☆☆ | ★☆☆☆☆ | ★★☆☆☆ | ★★★☆☆ | ★★★★☆ |
| Cost Range | $450-800 | $1,950-2,550 | $2,600-3,400 | $3,900-5,000 | $4,800-6,200+ |
| Best For | Daily commuting, family use | Daily / street | Street | Show / occasional track | Show only |
Real-World Reference Cases
The examples below are compiled from typical ANKUSI customer configurations and are labeled as reference cases, not individually verified real-world builds.
Case 1: Daily Driver (Factory-Style)
Profile: Everyday driving, prioritizes comfort and low running cost.
Setup: 18x8.5J ET40
Cost: ~$620
Outcome: Minimal visual change, ride and fuel economy essentially unaffected.
Case 2: Balanced Enthusiast (Balanced / Flush Fit)
Profile: Wants a sportier stance without sacrificing daily usability.
Setup: 19x9.5J ET30
Cost: ~$3,000
Outcome: Noticeable visual upgrade, fuel economy drop within the expected range.
Case 3: Show Build (Max Aggressive)
Profile: Built primarily for shows or occasional track/show use.
Setup: 20x10.0J ET25
Cost: ~$5,500
Outcome: Maximum visual impact; daily comfort and fuel economy are heavily compromised, physical test fit required before production.
Decision Guide
Offset & Backspacing Reference
Backspacing is calculated as wheel width (in) ÷ 2 + offset (mm) ÷ 25.4 + 0.5 (flange allowance):
- OE: 18x8.5J ET40 → ~6.32″ backspacing
- Flush: 19x9.5J ET30 → ~6.43″ backspacing
- Max: 20x10.0J ET25 → ~6.48″ backspacing
Want to check a different width or offset before you order? Use our Offset & Backspacing Calculator to solve the numbers yourself, or looking for your exact Audi spec, or want a wheel built to a custom offset for your Audi A8 3.7 quattro? Contact ANKUSI with your bolt pattern and offset target and we will confirm the correct forged wheel spec for your build.
Custom Forged Wheels for the Audi A8 3.7 quattro (2004)
Everything above is reference data. If you want wheels actually built to it, that is what ANKUSI does: we are a forged wheel factory in Guangzhou, China, IATF 16949 and ISO 9001 certified, forging on our own 10,000-ton press and producing over 120,000 wheels a year. Forging blank, CNC machining, finishing, coating and inspection all happen in the same building — nothing is subcontracted and nothing is relabelled from another manufacturer.
Every set is cut to order, so the 5x112 pattern and the 57.1mm centre bore are machined for this car specifically rather than shimmed with adaptor rings. Diameter, width, offset, concavity, monoblock or multi-piece construction and the finish are all yours to choose — most Audi orders on this platform land somewhere between the 19x9.5J ET30 flush setup and the 20x10.0J ET25 aggressive setup referenced above.
Designs we already tool for the 5x112 pattern — each one is re-cut to your sizes and offsets:
Audi Style Matte Silver 10 Y-Spoke Forged Wheels – Audi A6 / Audi A8 Fitment (5-Lug)
APEX Gloss Black 5 Y-Spoke Forged Wheels – BMW M3 / Audi RS5 Fitment (5-Lug)
Vossen Matte Silver 5 Y-Spoke Forged Wheels – Audi A6 / BMW 5 Series Fitment (5-Lug)
APEX Gloss Black / Gunmetal 5 Y-Spoke Forged Wheels – BMW M3 / Audi RS5 Fitment (5-Lug)Frequently Asked Questions
What bolt pattern (PCD) does the Audi A8 3.7 quattro use?
How many lug bolts does the Audi A8 3.7 quattro use?
What is the center bore size on the Audi A8 3.7 quattro?
What size are the factory (stock) wheels on the Audi A8 3.7 quattro?
What is the biggest wheel size I can fit on my Audi A8 3.7 quattro without rubbing?
What does a flush wheel fitment look like on the Audi A8 3.7 quattro?
Do I need wheel spacers for my Audi A8 3.7 quattro?
How do I calculate wheel backspacing for my Audi A8 3.7 quattro?
What's the difference between wheel offset and backspacing?
Can I run staggered wheels (different sizes front and rear) on my Audi A8 3.7 quattro?
Wheel Installation Reference: Torque, Thread & TPMS
Thread & Fastener: M14x1.5, ball-seat lug bolt (13mm radius).
Factory Torque Spec: 120 Nm (89 ft-lb). Shared VW/Audi Group ball-seat bolt spec used across most 5x112 Audi models.
TPMS: Vehicles built before the 2008 model year were not federally required to carry factory TPMS in the US, though many manufacturers adopted it earlier; verify whether your specific build has TPMS before ordering sensor-compatible wheels.
Tire Pressure: Always set tire pressure to the value on your vehicle's tire placard (driver's doorjamb or glovebox), not the max PSI printed on the tire sidewall — this is trim- and tire-size-specific and stays the same reference point when you switch to a different wheel and tire combination.
Reference data compiled from published OEM service specifications and cross-checked against independent repair sources; always confirm against your owner's manual or door-jamb placard before installation.