2008 Audi A4 (US) / A4 Cabriolet Wheels & Rims: Bolt Pattern, Offset & Sizes
Fitting Audi A4 (US) / A4 Cabriolet wheels? This page gives the 2008 Audi A4 (US) / A4 Cabriolet bolt pattern (5x112), centre bore, factory rim size and the offset range for aftermarket and forged Audi A4 (US) / A4 Cabriolet rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.
Quick answer: The 2008 Audi A4 (US) / A4 Cabriolet uses a 5x112 bolt pattern with a 57.1 mm centre bore and M14x1.5 lug bolts. Factory wheels: 17x7.5J, front and rear. For aftermarket wheels, 18x8.5J ET35 sits flush and 19x9.0J ET32 is the most aggressive fit.
Forged wheels for the 2008 Audi A4 (US) / A4 Cabriolet — drilled 5x112 with a 57.1 mm centre bore, built to the offset you choose. From $220 per wheel, made to order in 20–25 days.
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Audi A4 (US) / A4 Cabriolet (2008): 5x112 bolt pattern, 57.1mm center bore. Factory wheels: 17x7.5J F/R. Reference fitment ranges.
Bolt Pattern5x112
Wheel Bolt/NutM14x1.5 Bolt
Center Bore57.1mm
Wheel Load Rating650–750 kg/wheel (Standard Passenger Car segment reference)
Year2008
CategorySedan/Conv
✓ Data check: the bolt pattern and center bore on this page match an independent fitment reference. Last reviewed September 18, 2026. How we verify
Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Factory (OE) | 17x7.5J F/R |
| Flush Fitment | 18x8.5J at ET35 offset |
| Maximum Aggressive | 19x9.0J at ET32 offset |
Forged Wheel Designs for the Audi A4 (US) / A4 Cabriolet
Every design below is forged to order, so it can be machined to the Audi A4 (US) / A4 Cabriolet's 5x112 bolt pattern and 57.1 mm center bore, with the width and offset calculated for your setup.
Vossen-Style Gloss Black 5 Split Y-Spoke Forged Wheels
Monoblock · Gloss Black
Vossen HF-2-Style Gloss Black 10 Y-Spoke Forged Wheels
Replica · Gloss Black
Gloss Black 12-Spoke Forged Wheels
Monoblock · Gloss Black
Mirror Polished 5 Split-Spoke Deep Dish 2-Piece Forged Wheels
2-Piece · Mirror Polished
Brushed Silver Web Multi-Spoke Forged Wheels
Monoblock · Brushed Silver
WF Side-Milled Brushed Silver 5 Y-Spoke Forged Wheels
Replica · Side-milled Brushed Silver
Audi OEM-Style Chrome 5-Spoke Rotor Forged Wheels
Monoblock · Chrome
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
Convertibles lose some of the structural rigidity a fixed roof provides, which means the suspension and wheels end up doing more of the work to keep the chassis composed. A forged wheel keeps unsprung mass down without sacrificing the strength margin the factory built in — useful on a platform that's already managing extra flex.
The Audi A4 (US) / A4 Cabriolet runs a 5x112 bolt pattern, 57.1mm center bore, and a 17x7.5J, front and rear, wheel from the factory. Our Flush Fitment reference is 18x8.5J ET35, which tucks the tire under the fender lip on a stock-height Audi A4 (US) / A4 Cabriolet. Our Maximum Aggressive reference is 19x9.0J ET32 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
Audi A4 (US) / A4 Cabriolet OE Wheel Specs
The 2008 Audi A4 (US) / A4 Cabriolet (Sedan/Conv) uses a 5x112 bolt pattern with a 57.1mm center bore. Factory wheels are 17x7.5J 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 A4 (US) / A4 Cabriolet (2008) 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 — 10,093 vehicles, free to download, CC BY 4.0.
Offset & Backspacing Reference
Backspacing is calculated as wheel width (in) ÷ 2 + offset (mm) ÷ 25.4 + 0.5 (flange allowance):
- OE: 17x7.5J ET45 → ~6.02″ backspacing
- Flush: 18x8.5J ET35 → ~6.13″ backspacing
- Max: 19x9.0J ET32 → ~6.26″ 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 A4 (US) / A4 Cabriolet? Contact ANKUSI with your bolt pattern and offset target and we will confirm the correct forged wheel spec for your build.
Vehicles With the Same Hub as the Audi A4 (US) / A4 Cabriolet (5x112, 57.1 mm Bore)
In our database, 407 other vehicle entries from 18 makes use exactly the same 5x112 bolt pattern and 57.1 mm center bore. Factory wheels from these cars bolt on and center on the hub without rings; offset and width still have to be checked.
5x112 is used by 21.6% of the vehicle pages in our English fitment guide (1,407 of 6,503); 29.0% of those also use a 57.1 mm center bore.
Hub-Centric Rings for a 57.1 mm Center Bore
A wheel with a center bore larger than 57.1 mm needs a hub-centric ring. The most common combinations:
| Wheel bore | Ring size |
|---|---|
| 60.1 mm | 60.1 → 57.1 mm |
| 63.4 mm | 63.4 → 57.1 mm |
| 64.1 mm | 64.1 → 57.1 mm |
| 65.1 mm | 65.1 → 57.1 mm |
| 73.1 mm | 73.1 → 57.1 mm |
ANKUSI forged wheels are bored to exactly 57.1 mm for this vehicle, so no ring is needed.
Frequently Asked Questions
What bolt pattern (PCD) does the Audi A4 (US) / A4 Cabriolet use?
The 2008 Audi A4 (US) / A4 Cabriolet uses a 5x112 bolt pattern.
How many lug bolts does the Audi A4 (US) / A4 Cabriolet use?
The Audi A4 (US) / A4 Cabriolet uses a 5-lug bolt pattern (5x112), so you need a 5-lug forged wheel to bolt straight on.
What is the center bore size on the Audi A4 (US) / A4 Cabriolet?
The Audi A4 (US) / A4 Cabriolet's center bore is 57.1mm. If an aftermarket wheel has a larger center bore than this, hub-centric rings are recommended so the wheel centers on the hub itself rather than relying on the lug bolts alone.
What size are the factory (stock) wheels on the Audi A4 (US) / A4 Cabriolet?
Factory wheels on the Audi A4 (US) / A4 Cabriolet are 17x7.5J F/R.
What is the biggest wheel size I can fit on my Audi A4 (US) / A4 Cabriolet without rubbing?
The most aggressive fitment we recommend without fender work is 19x9.0J at ET32 offset. Going beyond this typically causes rubbing under compression unless you roll the fenders or add camber correction.
What does a flush wheel fitment look like on the Audi A4 (US) / A4 Cabriolet?
For a flush look with minimal to no rubbing, we recommend 18x8.5J at ET35 offset as a starting point on a stock or mildly lowered Audi A4 (US) / A4 Cabriolet.
Do I need wheel spacers for my Audi A4 (US) / A4 Cabriolet?
No. ANKUSI forges each wheel to your exact target offset, including the flush or max specs above, so you get the correct fitment without stacking spacers. Spacers are typically only used to push out an existing OE-offset wheel without replacing it, which isn't necessary when you're ordering a custom-offset forged wheel.
How do I calculate wheel backspacing for my Audi A4 (US) / A4 Cabriolet?
Backspacing (in inches) = wheel width (in) ÷ 2 + offset (mm) ÷ 25.4 + 0.5 (flange allowance). For example, the flush spec above works out to roughly 6.13" of backspacing.
What's the difference between wheel offset and backspacing?
Offset is the distance in millimeters from the wheel's true centerline to its mounting face (positive offset pulls the wheel in, negative pushes it out). Backspacing is the distance in inches from the mounting face to the back edge of the wheel barrel. They describe the same fitment from two different reference points, which is why ANKUSI lists both above — some shops and tuning guides quote offset, others quote backspacing.
Can I run staggered wheels (different sizes front and rear) on my Audi A4 (US) / A4 Cabriolet?
The Audi A4 (US) / A4 Cabriolet runs the same wheel size front and rear from the factory, so staggered fitment is not required. ANKUSI can still forge a staggered set (wider rear) on request if you want a more aggressive stance.
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: TPMS (Tire Pressure Monitoring System) has been federally mandated on all new light vehicles sold in the US since the 2008 model year. If your wheels use OE-style sensors, have them transferred or cloned to the new wheels at installation.
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.
Sources and Last Update
Data checked against: avtoreference.com.
This record is part of the open ANKUSI Wheel Fitment Dataset (DOI 10.5281/zenodo.23241521, CC BY 4.0).
Other cars on the same factory size: 17x7.5 wheels · 17 inch wheels.
Compiled by the ANKUSI Wheels engineering team, an IATF 16949 and ISO 9001 certified forged wheel factory in Guangzhou.