20×9.0 / 20×10.0 Forged Monoblock Wheels for 2021 BMW M340i (G20) – Full Gloss Black Lightweight Multi-Spoke 5×112

Engineering Notes

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

Lightweight Multi-Spoke Forged Construction

The dense multi-spoke design gives these forged monoblock wheels a distinctive appearance, with slim, closely arranged spokes extending from the center toward the outer rim. Open sections between the spokes reveal the brake area, while precisely machined recesses add depth to the otherwise continuous wheel face.

The hub, spokes and barrel form a single forged aluminum structure without separate center-to-barrel joints. CNC machining defines the narrow spoke sections and recessed areas, creating the detailed geometry within the one-piece construction.

The 20×9.0 front wheel weighs 11.1 kg, while the wider 20×10.0 rear wheel weighs 11.9 kg. Each wheel carries a rated load capacity of 850 kg.

Staggered Design with Distinct Concave Profiles

The front and rear wheels share the same 20-inch diameter but use different widths and face profiles. The front features a 20×9.0 configuration with ET28 offset, while the rear measures 20×10.0 with ET32 offset.

The wider rear wheel accommodates a more pronounced concave profile, creating a visible difference in depth between the two axles. Separate spoke-face designs maintain the same multi-spoke styling while allowing the geometry of each wheel to reflect its individual dimensions.

Both wheels feature a 5×112 bolt pattern, 66.6 mm center bore and 15×32×60° taper-seat specification. These production dimensions define the completed 2021 BMW M340i G20 wheel set, with installation compatibility dependent on the specific vehicle configuration.

Full Gloss Black Finish

Full Gloss Black covers the wheel face, recessed spoke channels, outer rim and barrel, giving the intricate multi-spoke pattern a continuous reflective surface.

The narrow openings and closely spaced spokes create multiple transitions between exposed faces and deeper machined areas. Consistent surface preparation and coating coverage help preserve an even black appearance throughout these details.

A transparent gloss clear coat provides the final reflective finish and protects the underlying color coating from routine exposure to moisture, road contamination and brake dust. The recorded production lead time for this forged monoblock wheel set is 25 days.

From Design to Delivery

• 20×9.0 front and 20×10.0 rear dimensions inspected
• ET28 front and ET32 rear offsets verified
• 5×112 PCD and 66.6 mm center bore checked
• 15×32×60° taper-seat profile inspected
• Front wheel weight confirmed at 11.1 kg
• Rear wheel weight confirmed at 11.9 kg
• Radial and lateral runout checked
• Multi-spoke geometry and concave profiles inspected
• Gloss Black coating coverage and surface consistency checked
• Dynamic balancing completed for each wheel

Result

The completed wheel set brings a finely detailed multi-spoke design to the BMW M340i, with narrow spokes and open sections creating a distinctive pattern across the Gloss Black face. Reflections along the machined spoke edges reveal the depth of the recessed channels and the different front and rear concave profiles.

Both wheel sizes maintain the same visual character, while the wider rear configuration gives the set a more pronounced staggered appearance. The finished forged monoblock wheels weigh 11.1 kg at the front and 11.9 kg at the rear, with a rated load capacity of 850 kg per wheel.

Building a BMW M340i, 330i or another customized G20 performance sedan?

XINGTU manufactures forged wheels according to your actual brake, suspension, fender and tire measurements, including staggered widths, separate front and rear concave profiles, custom offsets and gloss finishes.

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

Front & Rear Wheel Specifications

The completed set uses 20×9.0 ET28 front wheels and 20×10.0 ET32 rear wheels. Both feature a 5×112 bolt pattern, 66.6 mm center bore and 15×32×60° taper-seat design. The staggered arrangement maintains a consistent 20-inch diameter while giving the rear wheels additional width and concave depth.

Forged Monoblock Structure & Weight

Each wheel combines the center, spokes and barrel in a single forged aluminum body. The slim multi-spoke layout includes open sections and recessed contours machined directly into the wheel face. The front wheel weighs 11.1 kg and the rear 11.9 kg, with a rated load capacity of 850 kg per wheel.

Mounting & Vehicle Compatibility

The production dimensions correspond to the featured 2021 BMW M340i G20 project. The 60° taper-seat specification requires compatible mounting hardware, and the selected tire sizes must provide sufficient clearance around the brake calipers, suspension and fenders. Fitment should be checked against the actual vehicle, particularly where modifications affect the available mounting space.

1. Will These Forged Wheels Fit Every BMW M340i G20?

The featured wheels follow the production specifications of a 2021 BMW M340i G20 project. Their staggered widths and offsets require verification of brake clearance, suspension geometry, tire dimensions and mounting hardware. Compatibility should not be assumed for every G20 configuration.

2. What Are the Front and Rear Wheel Specifications?

The front wheels measure 20×9.0 with an ET28 offset, while the rear wheels measure 20×10.0 with an ET32 offset. Both use a 5×112 bolt pattern, 66.6 mm center bore and 15×32×60° taper seat. The finished weights are 11.1 kg and 11.9 kg respectively, with a rated load capacity of 850 kg per wheel.

3. Why Do the Front and Rear Wheels Have Different Concave Profiles?

The staggered configuration uses different wheel widths and mounting offsets. The wider rear wheel accommodates a deeper concave face, while the front retains a profile suited to its narrower dimensions. Both share the same multi-spoke design for a coordinated appearance.

4. What Mounting Hardware Is Required?

The wheels feature a 15×32×60° taper-seat design. Installation hardware must match the wheel's seat geometry and the vehicle's thread requirements. Ball-seat and taper-seat fasteners should not be treated as interchangeable.

5. How Is the Full Gloss Black Finish Maintained?

The Gloss Black color coating is covered by a transparent clear coat. Regular cleaning with a suitable, non-abrasive wheel cleaner helps remove brake dust and road contamination. Avoid aggressive polishing compounds that could damage the coated surface.

6. Can the Wheel Dimensions or Finish Be Customized?

Wheel widths, offsets, center bores, mounting details and finishes can be discussed for different vehicle configurations. The multi-spoke design can also be adapted to separate front and rear dimensions while retaining a coordinated overall appearance.