S4 lightweight 18-inch
- Front and rear
- 18 × 9 inch, ET25 · 255/40 R18
Documented Apex VS-5RS fitment clearing standard S4 brakes. Requires matching conical-seat hardware.
2015–2024 · saloon / estate
Audi A4 / S4 B9 wheel fitment
B9 A4 and S4 owners usually keep a square wheel and tyre arrangement. Nineteen-inch road sets and lighter eighteen-inch performance wheels are established options, but the S4's brakes need a suitable barrel and spoke design.
5x112 bolt pattern · 66.5 mm centre bore · Stock wheels: 16 × 7, 17 × 7.5, 18 × 8, 19 × 8.5 inch · Stock tyres: 205/60 R16, 225/50 R17, 245/40 R18, 245/35 R19
Updated 2026-10-04 · High source confidence. Check your exact trim and market. How we check specs
Quick specs
| Specification | Value |
|---|---|
| Bolt pattern | |
| Stock tyre sizes | |
| Centre bore | 66.5 mm |
| Fastener and thread | Wheel bolt, M14x1.5 |
| Tightening torque | 120 Nm (confirm in your handbook) |
Stock wheels and tyres
Factory options vary by trim and market. Match your car to the row below and check its tyre placard before using it as a baseline.
| Trim | Axle | Wheel | Tyre |
|---|---|---|---|
| A4 entry-level 16-inch package | Front and rear | 16 × 7 inch, ET35 | 205/60 R16 |
| A4 17-inch package | Front and rear | 17 × 7.5 inch, ET38 | 225/50 R17 |
| A4/S4 18-inch package | Front and rear | 18 × 8 inch, ET40 | 245/40 R18 |
| A4/S4 19-inch package | Front and rear | 19 × 8.5 inch, ET40 | 245/35 R19 |
Explained in our guides
Read these before choosing wheels for the A4 / S4: they explain the offset, fitment and hub numbers in this guide.
- Wheel offset explained: choosing ET without guessingUnderstand positive and negative wheel offset, calculate inner clearance and outer position, and choose an ET using measurements from your own car.
- Flush, poke and tucked fitment: measure the whole tyreUnderstand flush, poked and tucked wheels, calculate how width and offset change the look, and check clearance beyond a parked side-on photograph.
- Hub-centric vs lug-centric wheels: choosing hub ringsLearn what hub rings do, how to specify their inner and outer diameters, and why centring, wheel seats and vibration need separate checks.
Popular community setups
Starting points for a build. Read the notes with each setup, especially if your car is lowered or has different brakes.
S4 19-inch daily
- Front and rear
- 19 × 9 inch, ET32 · 245/35 R19
Apex VS-5 road fitment using original Audi ball-seat bolts. A 255/35 R19 road tyre is also listed by Apex.
S4 wider road and track
- Front and rear
- 19 × 9.5 inch, ET25 · 265/35 R19
Shown in Apex's B9 gallery. Wide track compounds may require extra front negative camber. Use the wheel manufacturer's specified bolt seat.
Width and offset guidance
Offset range
Check the exact setup
There is no confirmed range for this car yet. Compare a known wheel with your proposed size and measure both sides.
Common width limit
Measure before ordering
A maximum width has not been confirmed. Tyre shape, ride height and alignment all change the available space.
These figures belong to the setups described here. Combining the widest wheel with either end of the offset range does not guarantee a safe fit. For how ET moves the wheel in and out, read wheel offset explained; for how far the tyre can sit out, see flush, poke and tucked fitment.
Clearance notes
- Nominal hub listings vary between 66.5 and 66.6 mm. Wheels made for the smaller 57.1 mm Audi/VW hub do not fit.
- Original bolts have a ball seat; some aftermarket wheels require conical-seat bolts. Do not interchange seats.
- Wheelfitment and LFI specify 120 Nm. A ThreePiece S4 guide quotes about 140 Nm; use the vehicle specification of 120 Nm.
- These stock packages cover conventional A4/S4 bodies. Allroad and RS4 tyre diameters, arches and brake requirements need separate checking.
- Check full steering lock and suspension travel with the car loaded. Match wheel load rating, tyre load and speed ratings, fastener seats and brake clearance.
See it on your car.
Upload a photo and start with a look that suits the A4 / S4. Try the wheels, colour and stance before you spend on parts.
An AI preview shows the look. It cannot verify physical fitment.
Run the numbers
These tools start with the A4 entry-level 16-inch package front size. Choose your own trim or axle in the calculator if it differs.
Questions
What is the B9 A4 and S4 bolt pattern?
Both use 5x112 with M14x1.5 bolts and a nominal 66.5 mm hub.
Will 18-inch wheels fit a B9 S4?
Yes. The S4 had factory 18-inch wheels, and Apex documents an 18x9 ET25 fitment. Diameter alone does not establish brake clearance.
Should I stagger wheels on a B9 quattro?
The factory packages and the examples here are square. Keep compatible rolling circumferences across all four tyres when changing a quattro setup.
What size tyres does the Audi A4 / S4 B9 have?
Factory tyre (tire) sizes for the 2015–2024 Audi A4 / S4 B9 are 205/60 R16, 225/50 R17, 245/40 R18 and 245/35 R19, depending on trim. Your tyre placard shows the size for your car.
What wheel size does the Audi A4 / S4 B9 use?
Factory wheels are 16 × 7 inch, 17 × 7.5 inch, 18 × 8 inch and 19 × 8.5 inch, depending on trim. The stock table lists the offset for each.
What is the Audi A4 / S4 B9 centre bore?
66.5 mm. Aftermarket wheels with a larger bore need hub-centric rings sized to it.
What is the Audi A4 / S4 B9 wheel bolt torque?
120 Nm (about 89 lb-ft) for the original bolts. Confirm in your handbook, especially with aftermarket wheels or bolts.
Specs checked against
- Wheelfitment: B9 mounting specifications
- LFI: A4/S4 hub, torque and factory packages
- TireWheelGuide: 2018 A4 stock sizes
- AudiWorld: B9 factory wheel packages
- Apex: B9 S4/S5 fitment guide
- Apex: B9 S4 on 19x9.5 ET25
- ThreePiece: conflicting torque reference
This guide is a starting point, not a fitment guarantee. Specs can differ by market, trim and previous modifications. Confirm all sizes, clearances and fastener requirements with a qualified wheel and tyre professional before buying or fitting parts.
Related cars
More guides from Audi or cars with the same bolt pattern. A matching pattern alone does not make a wheel interchangeable.