About This Audi S4 B9 Build
We love featuring real builds from real owners. This Silver Audi S4 B9 sits on a set of 19×9.5-inch BC Forged RS31 wheels, and the result speaks for itself.
The owner chose BC Forged for a reason. This brand delivers serious quality and a design language that turns heads at every car meet. We see hundreds of Audi S4 builds come through WheelFront every month, but this one stands out. The combination of the Silver exterior with the BC Forged RS31 creates a look that balances aggression with elegance.
Fitment Breakdown: BC Forged RS31 on the Audi S4 B9
I walked around this B9 S4 for twenty minutes just staring at the stance. We went with a 19x9.5 setup here, which is basically the gold standard for this chassis. The ET40 offset sits perfectly flush against those stock fenders.
Most guys struggle to clear the massive front calipers on these Audis. These BC Forged RS31s handle that hurdle without needing a single spacer. The spoke geometry provides plenty of room for the brake hardware.
We paired these with 265/35/19 tires to get that meaty, performance-oriented profile. You get enough sidewall to survive the potholes while maintaining a sharp turn-in feel. The hub bore matches the B9 platform perfectly, so you won't deal with any annoying vibrations.
The ABT HAS suspension kit drops the ride height just enough to close that ugly factory wheel gap. We tuned the height to ensure the tires clear the fender liners during hard cornering. You get zero rubbing even when you push the car through tight sweepers.
These RS31s feature a clean, modular design that accentuates the depth of the wheel barrel. The spokes extend all the way to the edge, making the wheels look physically larger than they actually are. It transforms the visual weight of the car.
Watch your inner liner clearance if you decide to go any lower than this current drop. The B9 fender tabs can be a bit aggressive if you aren't careful with your alignment specs. We recommend a dialed-in alignment to keep everything tracking straight.
Overall, this 19-inch setup provides the best balance of looks and mechanical grip. You gain a wider footprint without sacrificing the daily drivability of the S4. It feels like a factory-plus upgrade that should have come from the dealer.
What We Recommend for Audi S4 B9 Owners
If you own a B9 S4, stop buying heavy cast wheels that ruin your suspension geometry. Stick to forged options like these BC Forged RS31s to save on unsprung weight. You will feel the difference in acceleration and braking immediately.
For the B9, 19x9.5 is your sweet spot for an aggressive, flush look. Anything wider than 9.5 starts to invite rubbing issues unless you run crazy camber. We find that ET40 to ET42 keeps you away from the fender edge safely.
Forget about running a staggered setup on an Quattro-equipped Audi. Keep it square so you can rotate your tires and protect your center differential. Staggered wheels on these cars look cool for a second, but they destroy your handling balance.
Skip the tire stretch trend if you actually enjoy driving your car hard. We love the look of a 265 width tire on a 9.5-inch rim because it protects the lip from curb rash. It also gives you that squared-off, purposeful sidewall aesthetic.
Avoid cheap spacers if you want to dial in your fitment further. If you aren't clearing your brakes, don't use a spacer to fix a bad wheel choice. Buy the right offset from the start and save yourself the headache of tracking down wobbles.
Style and Build Analysis
The Matte Black finish against the Silver paint creates a brutal, high-contrast aesthetic. It’s a classic color combo, but the aggressive mesh design of the RS31 updates the look for the modern era. You get a stealthy vibe that doesn't scream for attention like a bright chrome wheel.
The wheels look like they belong on a track car but hold their own at a Saturday morning Cars and Coffee. The lines of the RS31 complement the sharp creases in the B9 bodywork perfectly. It’s an evolution of the Audi design language rather than a distraction from it.
Many builds we feature end up looking too busy or overdone. This S4 stays clean and focused, letting the quality of the forged metal do the talking. The proportions are spot-on, giving the car a planted, predatory stance.
We’ve seen plenty of S4s on various setups, but this one hits differently. The visual balance between the light silver body and the dark, intricate wheel faces keeps your eyes moving across the car. It’s a masterclass in how to build a daily driver that looks like a show car.
This car exudes a sense of speed even when it sits perfectly still in the parking lot. You can tell the owner understands that fitment is just as important as the actual parts bolted on. It’s a cohesive package that looks like it belongs on the Nürburgring.
Why We Love This Build
There is something special about the way the silver paint pops against those matte black BC Forged barrels. As the sun hits the metallic flakes in the body, the wheels ground the car and make it look incredibly aggressive. We love how the ABT suspension eliminates that factory wheel gap to create a seamless transition from the tire to the fender.
This build stops us in our tracks because it ignores trends in favor of pure, functional performance. It’s the kind of car that makes you look back every single time you walk away from it. This S4 proves that you don't need a widebody kit to make a statement.
Stop overthinking your wheel choice and go get a set like these. Your B9 deserves to look this good on the road.
Full Specs Breakdown
Here is exactly what this owner is running. We break down every detail so you can replicate this build or use it as a starting point for your own setup.
- Car Make & Model: Audi S4 B9
- Vehicle Color: Silver
- Wheel Brand & Model: BC Forged RS31
- Wheel Size: 19×9.5
- Offset: ET40
- Wheel Finish: Matte Black
- Tires: 265/35/19
- Suspension: ABT HAS
Additional Build Info:
3mm rear spacers
Before You Buy: Fitment Checklist
We talk to Audi S4 owners every day. These are the questions we hear most before they pull the trigger on new wheels.
Will 19×9.5-inch wheels fit my Audi S4? Yes, but fitment depends on width, offset, and tire size working together. A wrong offset means rubbing. A wrong tire size means poor handling. Always verify all three.
Do I need to modify my fenders? That depends on your offset and suspension. A conservative offset with stock ride height usually fits without modification. Go aggressive and you may need to roll or pull your fenders.
Can I daily-drive this setup? Absolutely. Thousands of Audi S4 owners run 19×9.5-inch wheels every day. The key is choosing the right tire with enough sidewall to absorb road imperfections.
