21×10.5 Forged Monoblock Wheels for 2014 Audi RS6 Avant (C7 / 4G) – Raw Brushed Aluminum Deep-Concave Split 5-Spoke 5×112

Engineering Notes

XINGTU’s engineers want to highlight three details that define this build.

Deep-Concave Split Five-Spoke Design

The wheel features a wide 21×10.5 profile with five sculpted spokes that divide into angular sections toward the outer rim. Extended spoke tips and precisely machined recesses introduce multiple levels of depth, while the sharply recessed center gives the design its distinctive deep-concave appearance.

Each spoke flows outward from the central hub, with open sections that reveal the brake area and emphasize the wheel's substantial width. CNC machining defines the split-spoke contours, recessed channels and layered outer-rim details directly within the forged aluminum body.

The hub, spokes and barrel form a continuous forged monoblock structure without separate center-to-barrel joints. Despite the wide 21-inch configuration, the finished wheel weighs 13.7 kg and carries a rated load capacity of 850 kg.

Raw Brushed Aluminum Finish

Raw Brushed Aluminum reveals the natural metallic character of the wheel, with fine directional grain visible across the spoke faces, sculpted edges and outer-rim details.

Unlike conventional silver paint or chrome electroplating, this finish emphasizes the aluminum surface itself. Light reflects differently along the brushed grain and across the sharply machined transitions, bringing out the contrast between the broad spoke surfaces and recessed contours.

The split-spoke geometry introduces several intersecting surfaces, making consistent brushing direction and careful treatment of the transitions important to the finished appearance. The metallic tone can vary with viewing angle and lighting while retaining the distinctive texture of brushed aluminum.

Precision Wheel Specifications for the Audi RS6 Avant

The 2014 Audi RS6 Avant (C7 / 4G) wheel features a 21×10.5 size, ET21 offset and 5×112 bolt pattern. The production record specifies a 66.5 mm center bore and a 15×32×R12.8 short ball-seat profile.

The wide barrel and ET21 offset establish the wheel's mounting position, while the split-spoke design and deep-concave face maintain the intended proportions across the completed wheel.

The 66.5 mm center bore represents the recorded production dimension and should not be assumed to match every RS6 C7 hub, as commonly published vehicle references list 66.6 mm. Actual hub engagement, ball-seat mounting hardware, brake clearance and tire compatibility require confirmation against the specific vehicle before installation.

From Design to Delivery

• 21×10.5 wheel dimensions inspected
• ET21 offset verified
• 5×112 PCD and 66.5 mm center bore checked
• 15×32×R12.8 short ball-seat profile inspected
• Finished wheel weight confirmed at 13.7 kg
• Radial and lateral runout checked
• Split-spoke contours and deep-concave geometry inspected
• CNC-machined recesses and outer-rim details checked
• Brushing direction and surface uniformity inspected under controlled lighting
• Dynamic balancing completed for each wheel

Result

The completed wheels bring together a sharply recessed center, extended split spokes and intricate machined details that give the 21-inch design a distinctive sense of depth. The open five-spoke arrangement maintains clear definition across the wide wheel face, while the sculpted transitions connect the center with the outer rim.

The Raw Brushed Aluminum finish reveals the directional grain across the spokes and barrel, with subtle changes in reflection highlighting the different machined surfaces. The finished forged monoblock wheel retains the clean metallic appearance of the original design, without contrasting paint colors, decorative plates or separate rim components.

Building an Audi RS6, RS7, S6 or another customized C7 / 4G performance platform?

XINGTU manufactures forged wheels according to your actual brake, suspension, fender and tire measurements, including wide 21-inch fitments, custom offsets, ball-seat machining and raw brushed finishes.

MOQ 1 set, DDP worldwide. Send your vehicle and tire specifications for a free fitment check.

Wide Wheel Configuration & Mounting Dimensions

The completed wheel measures 21×10.5 with an ET21 offset, 5×112 bolt pattern and 66.5 mm center bore. Its 15×32×R12.8 short ball-seat specification requires matching mounting hardware. These dimensions describe the featured 2014 Audi RS6 Avant project, with hub fitment and clearance dependent on the actual vehicle configuration.

Forged Monoblock Structure

The wheel integrates the hub, split five-spoke face and barrel into a single forged aluminum body. Extended spoke tips and machined openings create the deep-concave design without separate structural rim components. Each finished wheel weighs 13.7 kg and carries a rated load capacity of 850 kg.

Natural Brushed Aluminum Surface

Directional brushing brings out the aluminum grain across the spokes, recessed contours and outer rim. The raw metallic appearance differs from silver-painted or chrome-plated finishes, with natural variations in reflection emphasizing the wheel's CNC-machined details.

1. Are These Forged Wheels Compatible with Every Audi RS6 C7?

The featured wheels follow the production specifications of a 2014 Audi RS6 Avant (C7 / 4G) project. Their 21×10.5 size and ET21 offset require verification of hub fitment, brake-caliper clearance, suspension geometry, fender clearance and tire compatibility. They should not be treated as universal direct-fit replacements for every RS6 C7 configuration.

2. What Are the Wheel Weight and Load Rating?

Each 21×10.5 wheel weighs 13.7 kg and has a stated load rating of 850 kg. The forged monoblock construction integrates the center, split spokes and barrel into a single aluminum body without separate structural rim joints.

3. What Is the Difference Between Raw Brushed Aluminum and Silver Paint?

Raw Brushed Aluminum displays the directional grain of the aluminum surface rather than covering it with an opaque silver coating. The finish highlights the CNC-machined spoke contours and recessed details, with reflections that vary according to the brushing direction and lighting.

4. Why Does the Production Record Specify a 66.5 mm Center Bore?

The recorded center bore for this project is 66.5 mm, while commonly published Audi RS6 C7 references list 66.6 mm. The actual hub dimensions and hub-centric fit must be verified before installation. The recorded production measurement should not be treated as a universal factory specification.

5. What Type of Wheel Bolts Does This Design Require?

The wheel features a 15×32×R12.8 short ball-seat specification. Mounting bolts must match the seat radius and contact profile, along with the vehicle's thread and installation requirements. Different ball-seat radii or taper-seat fasteners should not be substituted without confirming compatibility.

6. Can the Wheel Specifications or Surface Finish Be Customized?

Wheel widths, offsets, center bores, mounting details and finishes can be discussed for different vehicle configurations. The split five-spoke design can also be adapted to individual project requirements while retaining its distinctive deep-concave appearance.