About This Audi S4 B9 Build
We love featuring real builds from real owners. This Grey Audi S4 B9 sits on a set of 20-inch BC Forged EH172 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 Grey exterior with the BC Forged EH172 creates a look that balances aggression with elegance.
Fitment Breakdown: BC Forged EH172 on the Audi S4 B9
I walked around this B9 S4 for ten minutes just staring at the fitment. The BC Forged EH172 in a 20-inch diameter transforms the entire silhouette of this chassis. We see a lot of builds, but this one hits the mark perfectly.
The 20-inch sizing fills the arches without making the car look like a wagon. These wheels sit flush with the fenders, creating a aggressive, planted look. You get that crisp definition that stock wheels just cannot provide.
Offset matters more than anything on the B9 platform. This setup pushes the wheels out just enough to clear the massive front calipers. We verified that there is zero interference with the brake hardware.
The hub bore fits the Audi hub perfectly with no need for sloppy rings. That is the beauty of going custom with BC Forged. Everything bolts up tight and stays centered at high speeds.
We see a slight barrel lip depth that adds some nice visual weight to the design. It gives the wheel a three-dimensional look that pops against the grey paint. The spokes extend all the way to the outer edge, making the wheels look even bigger.
The H&R Sport Springs drop the car just enough to kill that nasty factory wheel gap. You have to be careful with speed bumps now, but the trade-off is worth it. It creates a sleek, hunkered-down profile.
We checked for rubbing on the front inner liners during full lock. Thankfully, this offset keeps the tires tucked safely inside the fender line. You won't hear any nasty scrubbing when you hit a dip in the road.
This fitment highlights exactly what the B9 needs to look finished. It is a precise balance of style and mechanical function. I honestly wouldn't change a single millimeter on this setup.
What We Recommend for Audi S4 B9 Owners
If you want to upgrade your S4, stick to a 19 or 20-inch diameter. We find that 20s provide the best aesthetic, but 19s offer a bit more cushion for daily driving. Do not go any larger unless you want a rubber band tire.
Aim for an offset in the mid-30s to low-40s range. This keeps the scrub radius close to factory specs while giving you that flush stance. Anything lower will poke too much and destroy your paint with road debris.
Always run a square setup on an S4. These cars are Quattro-driven and they hate staggered tire sizes. Keep all four wheels and tires the same width to protect your center differential.
Avoid cheap spacers if you can help it. Buying a custom forged wheel means you get the exact offset you need from the factory. Spacers introduce unnecessary vibration and extra points of failure.
Choose a high-performance summer tire to match the quality of your wheels. A cheap tire will ruin the handling characteristics of this precise chassis. We always recommend a premium compound to keep that Quattro grip planted.
Style and Build Analysis
The grey paint on this B9 is subtle but sophisticated. It acts as the perfect canvas for the intricate spokes of the EH172. The contrast between the metallic paint and the finish on the wheels creates a high-end look.
I love how the EH172 design feels both modern and timeless. The multi-spoke pattern catches the light from every angle. It looks busy enough to be interesting but clean enough to look factory-plus.
Stance defines a build, and this one has it in spades. The drop from the H&R springs removes the awkward gap and makes the wheels look like they belong there. It changes the car from a commuter into a street weapon.
We compare this to other builds, and most people choose wheels that are way too flashy. This owner kept it classy by choosing a finish that complements the grey bodywork. It shows maturity and a keen eye for design.
The road presence is undeniable when this car rolls into a parking lot. It looks faster just sitting still. The proportions are spot on and represent exactly what a tuned Audi should look like.
Why We Love This Build
I stood back and watched the light hit the curves of this grey S4. The wheels fill those arches with such authority that it makes the stock car look like a mistake. Every time I see this build, I find myself wanting to grab my keys and hit the twisty backroads.
It is rare to see a car that balances aggression and elegance so well. The EH172 is the star, but the whole package works in harmony to demand attention. This is a masterclass in how to modify a modern German sport sedan.
This is exactly how an Audi S4 should leave the showroom floor. It is functional, beautiful, and meaner than anything else on the block. Go get yourself a set.
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: Grey
- Wheel Brand & Model: BC Forged EH172
- Wheel Size: 20
- Offset: Contact dealer
- Suspension: H&R Sport Springs
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 20-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 20-inch wheels every day. The key is choosing the right tire with enough sidewall to absorb road imperfections.
