AC Schnitzer AC4 Forged 20"/21" Wheel Set, Techgold | G80 M3, G81 M3

From motorsport to the road - for more than 35 years, AC Schnitzer have opened the door to dedicated vehicle technology for dedicated BMW, MINI and Toyota Supra drivers. Beyond the standard, AC Schnitzer offers tailor-made components for the very special moments of driving pleasure. AC Schnitzer combine this exclusive form of automotive driving dynamics with unrestricted everyday usability.
$18,979.00

Product Information

Fitment Information

  • For M3 (G80) Sedan
  • For M3 (G80) Competition Sedan
  • For M3 (G80) Competition Sedan with M xDrive
  • For M3 (G81) Touring
  • For M3 (G81) Competition Touring
  • For M3 (G81) Competition Touring with M xDrive

AC Schnitzer AC4 Forged 20" Wheel Set Specifications

  • Front (FA): 20" x 10" ET 17 with 285/30 R20 Michelin Pilot Sport 4S
  • Rear (RA): 21" x 10" ET 17 with 295/25 R21 Michelin Pilot Sport 4S
  • Rim weight: FA 11.80kg, RA 12.80kg
  • Including RDC wheel electronics modules

AC Schnitzer AC4 Lightweight Forged Wheels

  • Weight-optimized rims through forging technology paired with premium tyres
  • Vehicle-specific tuning through multi-stage driving tests on road and race track

Uniqueness Of The AC Schnitzer AC4 Lightweight Forged Wheels

  • Rim with integrated lettering: "AC Schnitzer" and "GESCHMIEDET"
  • Open design in Techgold, giving a clear view of the brakes
  • Machined original AC Schnitzer logo
  • Compatible with standard RDC system
  • Rim also available separately
  • 2 years warranty
  • Developed exclusively for BMW vehicles
  • Production monitored according to ISO standard
  • KDS mount for wheel alignment according to BMW specification is available

Scope Of Delivery

  • 4 complete wheels - AC Schnitzer AC4 Lightweight Forged Alloy Wheels with Michelin tyres, mounted and balanced
  • 4 RDC wheel electronic modules
  • Vehicle and rim-specific mounting and fastening material
  • 4 pentagonal hub covers with AC Schnitzer logo
  • Certificate of authenticity
  • Care instructions
  • Homologation certificate


PRODUCT OVERVIEW


Wheel Set Development At AC Schnitzer

Wheel/complete wheel = rim incl. tyre
Wheel set = 4 wheels
xi/xd wheel sets = special wheel sets for all-wheel drive vehicles (xDrive)
Mixed-sized tyres = tyres wider on the rear axle than on the front axle
All-round tyres = same tyre size on the front and the rear axle

The wheels have a really important role: they are the postcard-sized connection between the vehicle and the road. They play a key role in the driving and propulsion as well as the deceleration - i.e. braking - of your vehicle. This gives the wheels a key role. Anyone who develops and sells wheels therefore has a great responsibility. AC Schnitzer are aware of this responsibility; they have internalized it and implement it with every new development.

AC Schnitzer only uses high-quality brand tyres, which are developed in close cooperation with premium tyre manufacturers. On the one hand, the tyres have to transfer the power of the engine perfectly to the road, on the other hand, properties such as braking behaviour, lateral control, water drainage in rain and the properties in straight running are important decision criteria for or against a tyre.

A wheel set with wide base tyres is always also an investment in increasing driving safety and dynamics. In order to maintain driving comfort when using larger wheel dimensions, AC Schnitzer have actively opted against run-flat tyres and for sporty, conventional tyres. Conventional tires build up less rolling resistance and offer noticeably more comfort.

AC Schnitzer specialises in mixed-sized tyres, i.e. wheel sets in which the wheels of the rear axle are wider than those of the front axle. This makes sense in terms of driving dynamics, as it allows strong drive forces to be transmitted while at the same time enabling high steering precision. Although the wider a tyre is, the more power you can put on the road, the rolling resistance caused by the tyre must not become too high. As the rolling resistance increases the wider a tyre is, AC Schnitzer works out the wheel dimensions that are balanced.

AC Schnitzer develops special wheel/tyre combinations for all-wheel drive vehicles and orientates itself on the specifications of the vehicle manufacturer. These AC Schnitzer wheel sets are marked "xi/xd". Only those wheel dimensions are developed and approved for all-wheel drive vehicles that are as gentle on transfer cases as standard wheel sets.

All AC Schnitzer wheel sets are tuned in multi-stage driving tests in traffic and on race tracks. Only after successful test runs the wheels are released for sale. All AC Schnitzer wheel sets are delivered fully assembled and balanced. They are subject to a two-year manufacturer's warranty. The scope of delivery includes mounting materials such as adapters and wheel bolts as well as the homologation certificate (with the exception of marked wheelsets for export).

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 rims to the bodywork,“ explains AC Schnitzer chief designer Michele Viandante. Rims that are too small quickly make a vehicle appear high-legged and unstable. The new Lightweight Forged Rims ”AC4“ from AC Schnitzer, on the other hand, are truly earthy.

The AC4 Wheels are an absolute highlight in the AC Schnitzer wheel range. These Lightweight Forged Wheels - in Techgold - achieve what appears to be fundamentally contradictory: reduction in weight on the one hand and the largest possible wheel diameters and widths on the other. The AC Schnitzer engineers and designers implement this apparent contradiction with the AC4 Lightweight Forged Rim: the design is completely independent - although the relationship to the successful Type V rim is unmistakable.

AC Schnitzer already gave the one-piece Lightweight Forged Rims AC4 extremely sporty genes in their design and these manifest themselves in their outer appearance: the central element is the filigree yet massive spoke matrix with its five triangular struts. The strong concave centre, to which the spokes seem to rush, underlines the uncompromisingly dynamic impression. 

The weight of the rim is only a sporty 11.8 kg. High quality lightweight forged wheels save approx. 25-35% weight, compared with conventional cast wheels. Perceptible reduction in unsprung mass and gyroscopic forces on the car, therefore significantly improved driving dynamics, improved acceleration and deceleration due to lower masses and improved cornering handling. High quality clear lacquer protects the wheel against corrosion, therefore long life.

Material

About 97 percent of the melt consists of aluminium, but the remaining three percent of the wrought alloy also helps to influence the desired properties of the material for the ideal wheel. In addition to the main component aluminium, the alloy also contains one percent magnesium and one percent titanium each (which ensures finer grain size). The precise composition of the material alloy has a decisive influence on the subsequent properties of the wheel.

Pure Aluminium | Approximately 97 percent of the alloy consists of pure aluminium. The remaining three percent of the wrought alloy is important for the properties of the material.

Chrome | The AlCr20 master alloy with the hard metal chromium improves recrystallisation resistance. Master alloy means a mixture of aluminium with other materials, in this case it is a maximum of 0.25% by weight of chromium, i.e. a very small amount.

Magnesium | Together with pure silicium, magnesium leads to a higher strength of the total alloy. The maximum proportion of these materials is 1.2 and 1.3 percent by weight, respectively.

Titanium | These glossy ingots are the master alloy AlTi5B1, which serves a finer grain structure of the total alloy. The proportion of the expensive raw material titanium is only 0.1 percent by weight.

Silicium | These irregularly shaped lumps are only added to the alloy together with magnesium. This increases the strength. The silicium 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. Manganese has a positive effect on recrystallisation behaviour.

Manufacturing

Forging - an elaborate process that must offer maximum safety. In many steps the wheel is prepared for its important task for a long car life. The process control guarantees excellent material properties, which are the reason for the low weight of the AC Schnitzer forged wheels. Even in critical driving situations, forged wheels offer the occupants optimum safety.

Step 1: The Nozzle | A cast block more than 6 m long manufactured by OTTO FUCHS is the starting material from which a socket, which is precisely matched to the later wheel, is sawn off.

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: Design Forging | In the second forming stage, the styling is pressed into the pre-forged blank under a 7,000 ton press, which gives the wheel its later appearance to a large extent.

Step 4: Punching | In the last forging stage with 800 tons of pressing force, the later ventilation hole windows and the hub bore are punched out and the burr of excess material sheared off at the outer circumference.

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

Step 6: Finishing | The final step is finishing: turning, drilling and deburring. Painting rounds off the complex process.

Source: Material and Production: Otto Fuchs KG

Surface, Techgold

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 matt 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 "rim life" is simulated in the bending circumferential test. Every AC Schnitzer rim 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 AC Schnitzer 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


EU TYRE LABEL


Full Efficiency

Front axle: E
Rear axle: E

Wet Grip

Front axle: A
Rear axle: A

Noise Level 

Front axle: B / 73
Rear axle: B / 73


MULTIMEDIA & DOCUMENTATION




Models
  • 3 Series / G80 / G81 M3 (2021+) / M3
  • 3 Series / G80 / G81 M3 (2021+) / M3 Competition

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