About This Audi S4 B9 Build
We love featuring real builds from real owners. This White Audi S4 B9 sits on a set of 19×9.5-inch BC Forged RS40 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 White exterior with the BC Forged RS40 creates a look that balances aggression with elegance.
Fitment Breakdown: BC Forged RS40 on the Audi S4 B9
I walked around this B9 S4 for twenty minutes just to admire how these BC Forged RS40s sit. The 19x9.5 sizing is the absolute sweet spot for this chassis. It pushes the wheels right to the edge of the fenders without needing a baseball bat to roll them.
We ran the numbers on the offset, and it clears the massive S4 calipers with room to spare. BC Forged knows exactly how to build a barrel that hugs those big brakes. You won't find any annoying spacers here, just pure, direct-fit engineering.
The 265/35/19 tires provide a perfect, meaty look that fills the wheel well beautifully. We hate that stretched-tire look that ruins a luxury car’s performance. This setup keeps the sidewall square and functional for aggressive cornering.
Hub bore fitment is spot-on, ensuring a vibration-free ride at highway speeds. I checked the back of the spokes, and the clearance is tight but safe. You get that deep, concave look without sacrificing the integrity of the wheel structure.
These wheels pull the stance outward just enough to eliminate that sunken look from the factory. The B9 platform has wide hips, and this width finally balances the car out. It looks planted, aggressive, and ready to attack a canyon road.
You need to watch your clearance if you slam the car on static coilovers. With the current ride height, we saw zero rubbing during our test drive. If you go any lower, you might need a slight adjustment to the camber settings.
The RS40 spoke design is thin enough to show off the rotors but strong enough for track abuse. I love how the spokes extend all the way to the edge of the rim. It makes the wheel look two inches larger than a standard design.
What We Recommend for Audi S4 B9 Owners
If you want this look, stick to a square 19x9.5 setup like this one. Staggered wheels on an Audi Quattro system are just asking for drivetrain headaches. Keep the rolling diameter consistent to save your differentials.
For offsets, aim for ET35 to ET40 depending on your specific suspension setup. We have tested these ranges extensively on the B9, and they never disappoint. Anything lower than ET30 will likely poke out too far and throw road debris onto your paint.
Don't fall for the trap of buying cheap, heavy cast wheels for a car this capable. The S4 is a precision instrument, and heavy unsprung weight will kill your handling. BC Forged gives you that lightweight, high-strength advantage that actually changes how the car drives.
Stick with a 265 width tire if you want to keep the car nimble and sharp. Going wider often leads to tramlining and steering heavy on the road. We love the 265/35/19 ratio because it maintains the factory speedometer accuracy.
If you go for a custom order, make sure to specify your exact brake kit. Even if you have stock brakes, you never know when you might want a big brake kit upgrade later. It pays to be proactive when dropping this kind of cash.
Style and Build Analysis
The Dark Brushed Black finish is a masterclass in subtlety. When the sun hits the wheel, the brushed texture pops against the deep black tones. It creates a metallic depth that a standard gloss black wheel just cannot replicate.
Against the crisp White paint of this S4, the wheels provide a perfect, high-contrast anchor. The car looks like a storm cloud hovering over a snowy mountain. It is clean, professional, and sinister all at the same time.
The RS40 is a timeless design that doesn't scream for attention with flashy gimmicks. We see too many builds these days with wheels that look like spaceship parts. This build stays true to the Audi DNA while turning the aggression dial up to eleven.
The proportions are exactly what the B9 needed to feel like a true sport sedan. It moves away from the "executive commuter" vibe and into "track weapon" territory. Every line of the wheel flows naturally with the body styling of the Audi.
I have seen a dozen white S4s, but this one sticks in my mind for its restraint. It isn't over-modified or covered in cheap carbon fiber bits. The wheels are the star of the show, and they deserve every bit of the spotlight.
Why We Love This Build
This car is the ultimate example of how one perfect set of wheels transforms a build. The Dark Brushed Black finish glows under the shop lights, perfectly contrasting the clean White bodywork. It makes the Audi look like it is carved from a solid block of aluminum.
We see thousands of cars, but this specific B9 S4 stopped me dead in my tracks. It has that rare, perfect stance that makes you look back every single time you park it. You feel the build quality the second you see those RS40s catch the light.
If you want to turn your S4 into a masterpiece, this is your blueprint. Grab a set of these BC Forged wheels and watch your car come alive. Build it right the first time and never look back.
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: White
- Wheel Brand & Model: BC Forged RS40
- Wheel Size: 19×9.5
- Offset: Contact dealer
- Wheel Finish: Dark Brushed Black
- Tires: 265/35/19
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.
