AC Schnitzer AC3 Complete Wheel Set (9.0x21"/10.0x21") - BMW X3M/X4M F9x Models

Features of the AC3 Wheel:
- Made in Germany
- Weight optimised
- Developed exclusively for BMW vehicles
- With exclusive AC Schnitzer and forged lettering
- Warranty 2 years
- Production monitored according to ISO standard

What's included (No Tyres):
- 2x Front AC3 9.0x21" Wheels
- 2x Front Spacers & Extended Bolts
- 2x Rear AC3 10.0x21" Wheels
- 2x Rear Spacers & Extended Bolts

What's included (With Tyres):
- 2x Front AC3 9.0x21" Wheels
- 2x Front Spacers & Extended Bolts
- 2x Front Tyres (255/40/R21)
- 2x Rear AC3 10.0x21" Wheels
- 2x Rear Spacers & Extended Bolts
- 2x Rear Tyres (265/40/R21)
- 4x TPMS Sensors
Mounted and Balanced

Philosophy/Design
The wheels not only physically but also optically connect a car to the road. “That‘s why it‘s very important to have the right dimensions between the proportions of the wheels to the bodywork,“ explains AC Schnitzer chief designer Michele Viandante. Wheels that are too small quickly make a vehicle appear high-legged and unstable. The AC3 Flowforming Wheels realise what at first sight seems contradictory: reduction in weight with simultaneously increased wheel diameters.

9 or 10 x 21 inch are the dimensions of the AC3 Flowforming wheels. Two colour variants are available in Bi-Colour Silver/Anthracite or Anthracite matt. Visually, the wheels can be clearly assigned to the AC3 wheel family and they complement the portfolio in terms of sizes, areas of application and manufacturing processes.

The lower weight of the AC3 Flowforming wheels reduces the unsprung masses on the vehicle by about 10 kg and thus also reduces the CO2 emissions of the vehicle. At the same time, there is also a noticeable improvement in driving dynamics, as the gyroscopic forces on the axles are reduced by about four times - by a perceived 40 kg. The AC Schnitzer AC3 Flowforming wheels therefore offer real advantages: for the driver and the environment.

Material
Only high quality aluminium alloys with the AlSi7 or AlSi11 specification are used. 
Both types of material are additionally heat treated in the production process, which results in higher strength and simultaneous weight reduction. Material samples during the production process guarantee the constant and high quality of the material.

Manufacture
The flowforming process is one of the most advanced manufacturing technologies in wheel industry. In this production process, after the actual aluminium casting, the raw product is further processed by rolling it out. This step serves to compress the metal, which guarantees greater stability and impact resistance of the rim.

On the other hand, the improved stability also allows the design of the wheels to be more filigree, as the wall thicknesses can be significantly thinner compared to conventionally manufactured rims.

And this is measurable: compared, for example, with the BMW forged wheel "Double Spoke 706 M" for the M5, which at 10.5J x 20" is even one inch smaller than the new AC3 Flowforming wheels, these are 2.4 kg and 2.5 kg lighter than the BMW wheel.

Bi-Colour Surface
In this process, the wheel is first primed, then completely painted, and finally sealed with an acrylic clear coat. The surfaces that will later have a shiny metallic finish are then machined. Finally, a two-layer clear coat is applied, consisting of a polyester primer and the acrylic clear coat.

Black Surface
In this process, the wheel is first primed, then completely painted. A two-layer clear coat is then applied, consisting of a polyester primer and the acrylic clear coat.

Test Procedures / Safety
After their design, the first sample rims are manufactured under real production conditions. These must undergo a multitude of tests. Among other things, the strength is tested. The "wheel life" is simulated in the bending circumferential test. Every AC Schnitzer wheel must withstand this intact in order to be allowed to be produced and sold at all.

This is followed by vehicle specific tests, including test installations with check of unobstructed movement and driving tests on public roads and on race tracks. Only after these procedures our rims receive their homologation, i.e. the approval to be used in road traffic.

Wheels are safety relevant components. Therefore, they are checked and tested with the greatest care. This starts with the first chemical material tests and ends with hard testing machine endurance runs:

- § 30 StVZO wheel guideline
- ECE R124
- Bending-rotation tests
- 90° impact test
- Unwinding tests