AC Schnitzer 21" wheel & tyre set AC6 forged Black Yokohama for BMW M5 G90/G99 (82453907138)

including RDC wheel electronics modules
- for M5 Sedan G90 and Touring G99
FA: 10,5 x 21" ET 25 with 285/35 R 21
RA: 11,0 x 21" ET 22 with 295/35 R 21

Scope of delivery
- 4 complete wheels AC Schnitzer AC6 Lightweight Forged Alloy Wheels with premium tyres - mounted and balanced
- vehicle and rim-specific mounting and fastening material
- 4 pieces RDC wheel electronic module
- pentagonal hub cover with AC Schnitzer logo
- quality tag
- certificate of authenticity
- care instructions
- homologation certificate

Wheel set with AC6 lightweight forged rims
- exclusively for BMW M5 G90, G99
- Weight-optimized rims through forging technology paired with premium tires
- Vehicle-specific tuning through multi-stage driving tests on the road and race track

Uniqueness of the wheel set with the AC6 lightweight forged rims
- Highly technical appearance thanks to five filigree Y-spokes facing the brakes
- Open design in natural aluminum with ceramic compression or glossy black
- Compatible with the standard RDC system
- Wheel also available separately
- 2-year warranty
- Developed exclusively for the BMW M5 G90, G99
- Production monitored according to ISO standards

Scope of delivery
- 4 complete wheels AC Schnitzer AC6 lightweight forged wheels with premium tires
- mounted and balanced
- Vehicle- and wheel-specific mounting and fastening material
- Pentagonal hub cap with AC Schnitzer logo
- Quality tag
- Certificate of authenticity
- Care instructions
- Report

Wheelset development at AC Schnitzer
A few definitions first

Wheel/Complete wheel = Rim including tire Wheelset = 4 wheels xi/xd Wheelsets = special wheelsets for all-wheel drive vehicles (xDrive) Mixed tires = Tires wider on the rear axle than on the front axle All-round tires = Tires the same on the front and rear axle
The wheels play a truly vital and therefore important role: they are the postcard-sized connection between the vehicle and the road. They are largely responsible for the acceleration and propulsion, as well as for the deceleration – i.e., braking – of your vehicle. The wheels therefore play a key role. Anyone who develops and sells wheels bears a great responsibility. We are aware of this responsibility; we have internalized it and implement it in every new development. At AC Schnitzer, we only use high-quality brand-name tires, developed in close cooperation with premium tire manufacturers. On the one hand, the tires must perfectly transfer the engine's power to the road; on the other hand, properties such as braking performance, lateral stability, water drainage in the rain, and straight-line stability are important decision criteria for or against a tire. A set of wide-base tires is always an investment in increased driving safety and dynamics. To maintain driving comfort when using larger wheel dimensions, we at AC Schnitzer have actively opted against run-flat tires and opted for sporty, conventional tires. Conventional tires create less rolling resistance and offer noticeably more comfort. AC Schnitzer specializes in mixed tire configurations, meaning wheel sets where the rear wheels are wider than the front wheels. This makes sense in terms of driving dynamics, as it allows for the transfer of strong drive forces while simultaneously enabling high steering precision. While the wider a tire, the more power you can deliver to the road, the rolling resistance caused by the tire must not be too great. Since this increases with the wider a tire, AC Schnitzer develops balanced wheel dimensions. AC Schnitzer develops special wheel/tire combinations for all-wheel drive vehicles, orienting themselves in these combinations to the vehicle manufacturer's specifications. You can recognize these AC Schnitzer wheel sets by the "xi/xd" designation. Only those wheel dimensions are developed and approved for all-wheel drive vehicles that are just as gentle on the transfer case as standard wheel sets. All AC Schnitzer wheel sets are tuned in multi-stage driving tests on the road and on race tracks. The wheels are only released for sale after successful testing. All AC Schnitzer wheel sets are delivered fully assembled and balanced. They are covered by a two-year manufacturer's warranty. The scope of delivery includes mounting materials such as adapters and wheel bolts, as well as the parts certificate (except for wheel sets marked for export).

Philosophy/Design
The wheels establish a car's connection to the road not only physically but also visually. "That's why the right proportions of the rims to the body are so important," explains AC Schnitzer Chief Designer Michele Viandante. "Rims that are too small can quickly make a vehicle appear long-legged and unstable." The AC Schnitzer "AC6" lightweight forged wheels, on the other hand, are truly down-to-earth. The AC6 lightweight forged wheels were developed exclusively for the BMW M5 G90, G99. Their five Y-spokes emphasize the braking system behind them and lend the vehicle a particularly dynamic presence. Also new is the surface finish of the light version in natural aluminum with its ceramic compression and protective coating. This gives the wheel a highly technical appearance and visual depth. The AC6 wheel is also available in gloss black. Both color variants are available in the following dimensions: front: 10.5J x 21" and rear: 11.0J x 21". The front axle rim weighs only 13.8 kg, while the rear axle rim weighs a sporty 14.3 kg. - High-quality lightweight forged wheels save up to 25-35% in weight compared to conventional cast wheels - Noticeable reduction of unsprung mass and gyroscopic forces on the car, resulting in - significantly increased driving dynamics - Significantly improved acceleration and deceleration due to lower masses - Improved cornering - High-quality clear coat to protect the rim against corrosion, resulting in - a long service life

material
Around 97 percent of the melt consists of aluminum, but the remaining three percent of the wrought alloy also plays a role in influencing the desired material properties for the ideal wheel. In addition to the main component, aluminum, the alloy also contains one percent each of magnesium and titanium (which ensures finer grain). The precise composition of the material alloy has a significant influence on the final properties of the wheel. Pure aluminum Around 97 percent of the alloy consists of pure aluminum. The remaining three percent of the wrought alloy is important for the material's properties. Chromium The master alloy AlCr20, which contains the hard metal chromium, improves recrystallization resistance. Master alloy is a mixture of aluminum with other substances; in this case, it is a maximum of 0.25 percent by weight of chromium, which is a very small amount. Magnesium Magnesium, together with pure silicon, increases the strength of the overall alloy. The maximum proportion of these materials is 1.2 and 1.3 percent by weight respectively. Titanium These shiny bars are the master alloy AlTi5B1. It serves to finer the grain structure of the overall alloy. The proportion of the expensive raw material titanium is only 0.1 percent by weight. Silicon: These irregularly shaped lumps are only added to the alloy together with magnesium. This increases the strength. The silicon content is between 0.7 and 1.3 percent by weight. Manganese: The addition of 0.4 to 1.0% manganese makes the alloy tougher. The manganese has a positive effect on recrystallization behavior.

production
Forging – a complex process that must ensure the highest levels of safety. In many steps, the wheel is prepared for its important role in ensuring a long vehicle life. This process guarantees excellent material properties, which are the reason for the low weight of our forged wheels. Forged wheels offer optimal safety for the occupants, even in critical driving situations.

Step 1: The nozzle
A manufactured cast block of over 6 m in length is the starting material from which a nozzle is sawn off, which is precisely tailored to the later wheel.

Step 2: Pre-forging
In the first forging stage, the nozzle is pre-forged into a rotationally symmetrical blank with a force of 4,000 tons.

Step 3: Designing
In the second forming stage, the styling is pressed into the pre-forged blank under a 7,000-ton press, which largely gives the wheel its final appearance.

Step 4: Punching
In the final forging stage with 800 tons of pressing force, the future ventilation hole windows and the hub bore are punched out and the burr made of excess material on the outer circumference is secured.

Step 5: Flow pressing
The outer edge of the blank is heated. The entire rim area, from the outer to the inner flange, is rolled out.

Step 6: Finishing
The final step is finishing: turning, drilling, and deburring. Painting completes this complex process.

Surface glossy black
In this process, the wheel is first primed and then completely painted. A two-layer clear coat is then applied, consisting of a polyester primer and an 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, their strength is tested. The bending test simulates the "rim lifespan." Every AC Schnitzer rim must survive this lifespan unscathed in order to be produced and sold. Vehicle-specific tests, including test installations with clearance measurements and driving tests on public roads and racetracks, follow. Only after these procedures do our rims receive homologation, i.e., approval for use on public roads. Wheels are safety-critical components. Therefore, they are inspected and tested with the utmost care. This begins with initial chemical material tests and concludes with rigorous endurance tests on test machines: - §30 StVZO wheel guidelines - ECE R124 - Bending tests - 90° impact test - Rolling tests

Scope of delivery
- 4 complete wheels AC Schnitzer AC6 lightweight forged wheels with premium tires
- mounted and balanced
- Vehicle- and wheel-specific mounting and fastening material
- Pentagonal hub cap with AC Schnitzer logo
- Quality tag
- Certificate of authenticity
- Care instructions
- Report

Uniqueness of the wheel set with the AC6 lightweight forged rims
- Weight-optimized rims through forging technology paired with premium tires
- Vehicle-specific tuning through multi-stage driving tests on the road and racetrack
- High-tech appearance through five filigree Y-spokes facing the brakes
- Open design in natural aluminum with ceramic compression or glossy black
- Compatible with the standard RDC system
- Rim also available separately
- 2-year warranty
- Developed exclusively for the BMW M5 G90, G99
- Production monitored according to ISO standards

Stock Availability

Due to the amount of bespoke orders it is not always possible for us to keep every item in stock at all times. If you require the item urgently please contact us to check stock before purchase.

Call on 01933 685840

Wheels & Tyres

All wheel & tyre packages are special order and cannot be cancelled or returned once purchased.

All in stock wheel & tyre packages come from Germany and have a 2-3 week lead time which includes tyre fitting.

Can I have these parts fitted?

We offer fitting on all our parts.

If you would like your parts fitting please contact us at 

info@ac-schnitzer.co.uk before you order online.

UK Next Day Delivery

We offer UK next working day delivery on all IN STOCK products. Please note all stock coming from Germany can be subject to 2-3 week lead time. Once in the UK these will be shipped UK next working day.

Any lead times longer than this and we will contact you to let you know.