19x8.5" ET20 APEX ARC-8 Wheel

History
The wheel that started it all

Since 2007, Our focus at APEX has been to produce high-performance wheels with extreme durability and unprecedented value for the performance driving community. Combining proven Motorsport design features, vehicle specific optimizations, and advanced Flow Forming Technology, we've created wheels that have taken performance driving enthusiasts by storm. This journey began when we wanted to create the perfect track wheel for our BMW E30 M3 track project. A niche was discovered, technology and volume merged with enthusiast support, and the first ARC-8 wheel was born.

Face Profile
One design, many faces

The ARC-8 wheel is available in two unique face profiles. The shallower face provides increased caliper clearance on narrow applications, while the deeper concave face reduces weight and creates a stunningly aggressive appearance on low offset and wide width applications. These two face profiles are available in all 17", 18" and 19" diameters.

Fit Matters
The right solution for every application

An optimized car setup begins with the perfect wheel and tire fitment. Without model-specific attention to each wheels specifications, maximum performance is compromised. Each size was selected to find the right balance between a clean fit and the most grip possible. The ARC-8's wide range of widths, diameters, offsets and face profiles result in 24 unique fitments ranging from 8.5" to 10.5" wide. Each wheel combines these features to meet the different brake caliper, strut, and fender clearance needs of each BMW model. Most vehicle models have options for wheels that range from direct-fit to aggressive for specialty applications. Daily drivers and professional racers don't have the same needs, so why should they be forced to buy the same exact fitment?

Spokes
More than just a pretty face.

The spokes of the ARC-8 were designed to be robust where they need to be and extra lightweight where they can be. The split "Y" spokes were carefully evaluated from every aspect to ensure light weight and remarkable strength. The lack of a deep front lip and spokes that connect directly to the barrel's lip create a rigid wheel with even load distribution. These features help reduce one of the most common concerns with aftermarket wheels — bending. Beauty follows function with this extremely popular design, as it adapts perfectly to both flat and concave versions.

Open Hub Center
Form follows function

Race wheels can't just be light, they need to function in a high performance environment. Unlike the narrow lug recesses of most other wheels, the ARC-8 wheel boasts a completely wide-open design that easily fits over-sized race lugs and beefy impact sockets. This allows for quick and easy wheel changes at the track, and as a bonus prevents chips and scratches from tools for those just running these wheels on the street.

Hub Centric
No rings or adapters here

All ARC-8 wheels are purpose built for select vehicle applications, and centering rings are never required for any BMW application. All 5x120mm bolt pattern wheels feature a direct-fit 72.56mm center bore.

Center Cap
A factory fit and finish

We don't reuse one cap design for all our wheels. Every ARC-8 wheel is designed to work with factory center caps. You can easily replace APEX center caps with OEM roundels for a clean factory look. The ARC-8 wheel will come with either our carbon-look center cap or our redesigned, Gloss Black center cap that mimics the size and shape of a BMW factory center cap.

Brake Clearance - Calipers
Spokes that work for you

APEX wheels properly clear all OEM brake calipers. Our wheels are targeted at the serious performance-minded owner. The spokes of the flatter faced ARC-8 were designed to clear Big Brake Kits. This is the best and only choice for BBK equipped cars. The concave version of the wheel is the best option for cars with factory brake calipers. Contact our experts to confirm your specific fitment.

Brake Clearance - Barrel
A lot of room in a small space

Spoke clearance is only half the problem. The barrel opening on a wheel also needs to be big enough to clear the sides of your caliper and rotor. Many wheels on the market have aesthetic compromises in their design that consumers don’t even know result in major negative impacts on barrel clearance. Those wheels may work with smaller stock brakes, or smaller diameter big brake kits, but the larger kits will pose a major problem. The 17” ARC-8 has some of the best barrel-side BBK clearance, easily fitting most aftermarket 355mm kits. Contact our experts to confirm brake clearances for your specific application.

TPMS Sensors
They all fit

TPMS sensors, which monitor tire pressure, are one piece of technology that can't be compromised. The attention to OEM compatibility on the ARC-8 wheel doesn't end with center caps. All APEX wheels accept OEM and aftermarket equivalent BMW TPMS sensors, and any standard sized metal or rubber valve stem.

Wheel Hardware
Original or Aftermarket, it all works

The ARC-8 wheel can be used with all OEM and aftermarket mounting hardware with a 60° tapered seat. Lug bolts, wheel locks, and stud conversion kits all work perfectly. The ARC-8 wheel also accepts wheel spacers without issue. The shallow rear chamfer allows the wheel to remain hub centric even when 5mm flat spacers are used. The chamfer is deep enough to clear the chamfered lip some aftermarket spacers have that would typically cause improper seating and wheel vibration.

FlowForming
Benefits of forging without the pain

All APEX wheels including the ARC-8 wheel are produced using the Flow-Forming technique. This process significantly reduces weight in the barrel, which has the greatest impact on rotational mass. During the manufacturing process, rollers apply high pressure to the inner barrel, compressing the aluminum into it's final shape. This effectively eliminates porosity and aligns the grain structure of the metal which increases tensile strength. The end result of the Flow-Forming process is a light-weight and extremely strong barrel that equals that of a traditional fully forged wheel at a fraction of the cost.

Testing & Certifications
We break a lot of wheels

Computer simulated stress tests are no match for real world testing when designing a light-weight wheel that will see extreme loads. All APEX wheels are crush and load tested to exceed JWL standards and those results are independently tested in Japan by the 3rd party government agency known as the VIA. Countless wheel companies falsely claim they are tested and certified by the VIA, and so they lack the certificates to prove it. We test and certify each and every design, diameter, width, and offset, separately. We publicly list all our VIA registration numbers which are on file with the VIA for confirmation. Don't trust brands that claim testing, but can't provide verifiable registration numbers.

Weight Optimization
The savings is in the details

Various design features were implemented to ensure that the ARC-8 wheel design was as light and durable as possible. We began with a strong one-piece design featuring an open hub center and reliefs in the mounting pad to remove weight between lug holes. The design was then run through Finite Element Analysis (FEA) to further optimize the spoke and barrel design. The result is a light weight wheel with extra strength in all the right places, while keeping weight to a minimum.

Finishes
Because being faster is just not enough

The ARC-8 wheel is available in multiple finishes, in addition to exclusive finishes available only through select dealers. All APEX wheels are finished using a comprehensive multi-stage liquid paint system over a powder coated base coat. Standard finishes include gloss metallic finishes, and semi-gloss or matte finishes. Hyper finishes include an additional coating of a premium liquid-like metallic silver to create a uniquely bright finish that can only be achieved through misting liquid paint.

Often overlooked, painted or powder coated lug hole seats can cause hardware to loosen or begin the spread of chipping the paint to more visible sections. The ARC-8 wheel's coating process leaves lug holes, center bores and mounting pads unpainted, which ensures proper fit and torque values.

Warranty
A wheel you can depend on

All APEX wheels are backed by a 2 year structural warranty and a 1 year finish warranty. This warranty guarantees that all APEX wheels will be free from defects in materials, workmanship, and paint finish under normal and reasonable use.