How we forge our wheels.
One-piece forged. Aerospace 6061-T6 aluminum. Compressed under 10,000 tons of pressure, machined to 0.02 mm tolerance, heat-treated to 310 MPa, certified to DOT, JWL, VIA, and TÜV standards. Here’s the full process — every step, every check.
The four stages.
Every wheel that leaves the factory has been through these four stages. No shortcuts. No casting hybrids. No skipped heat-treatment cycles.
Aerospace-grade 6061-T6 aluminum billet.
Every billet is 100% X-ray inspected before it goes near the forge. Hidden inclusions, voids, and impurities — the kind of defects that fail a wheel at 100 mph — get caught here, not at your hub. Lot-traceable from the smelter to the finished wheel.
One-piece forge under extreme pressure.
The billet is heated to 480–520°C and compressed in a 10,000-ton precision forging press. The pressure aligns the metal’s grain structure along the load paths of the wheel and compacts the internal tissue, eliminating the porosity and micro-cracks that plague cast wheels. The result is a single, continuous piece of structurally optimized aluminum.
Heat-treated to 310 MPa, machined to 0.02 mm.
The forged blank goes through full T6 heat-treatment, raising tensile strength past 310 MPa. From there, 5-axis CNC machining takes the wheel to final spec at a 0.02 mm tolerance — tighter than what most OE wheels are held to. Hub bore, lug pattern, and offset are cut to match the Explorer ST geometry exactly. No hub-centric rings. No spacers.
Surface finishing — corrosion-tested.
Multiple finish options — powder-coat paint, machined-and-polished, chrome electroplating — each one cured and inspected per its own spec. Every finish passes a corrosion test to global durability standards before shipping. If a finish blisters in a salt-spray cabinet, we don’t ship it.
What this gets you.
Forged wheels aren’t just stronger — they fundamentally change how your car behaves. Less unsprung mass at each corner means the suspension can respond faster, brakes can grab harder, and the powertrain doesn’t fight rotational inertia at every input.
Stronger than cast wheels of the same dimension. Grain-aligned structure carries load without micro-fracture.
Lighter than a cast equivalent. Less unsprung mass means faster acceleration, sharper braking, better ride.
Held to tighter tolerances than the OE wheel that came on your Explorer ST. Vibration-free at speed.
Post heat-treatment. Past the strength threshold for sustained motorsport use, by a wide margin.
Certified.
Every wheel design passes destructive testing for each of these standards before it’s allowed into the catalog. Documents available on request for distributors and shops.
The factory.
120-acre facility. 400+ employees, including a technical engineering team with 20+ years building forged wheels for OE and aftermarket programs. Annual production capacity of 1.2 million wheels, which is why a SparksCustomParts wheel can ship in 4–8 weeks — not the 6+ months you’ll see quoted on bespoke 3-piece programs.
Acre integrated forging + machining + finishing campus.
Employees, including a 20+ year engineering team.
Wheels per year. Stable supply, on-time deliveries.
Custom-finish wheels delivered. No 6-month waits.
Want to spec one?
Configure a wheel set in the builder, or send us a custom request and we’ll quote a bespoke build.