Quantum44 ZF-4 Two Piece Forged Wheels

Quantum44 ZF-4 Two Piece Forged Wheels — UK Full Forged

The Quantum44 ZF-4 Two Piece is a two-piece full billet forged wheel — a multi-spoke flowing forged design with swept spokes, directional character, and progressive taper. The ZF-4 Two Piece separates the forged face from a separately manufactured barrel, enabling deeper concave profiles and rim widths beyond the practical limit of single-piece machining. Quantum44 builds every set to order at its UK facility, specifying diameter, width, offset, PCD, and finish to the customer's exact brief. The ZF-4 carries Quantum44's standard forged specification: 6061-T6 aluminium, multi-axis CNC machining, and structural testing to European load standards.

Available Sizes

• Diameters: 13" | 14" | 15" | 16" | 17" | 18" | 19" | 20" | 21" | 22" | 23" | 24"
• Available Widths: 8.0" – 14.0"
• Standard catalogue sizes: 18", 19", 20", 21", 22"
• PCD options: 5×112, 5×120, 5×114.3, 5×130 — standard; any PCD — built to order
• Offset (ET): Multiple ET options; staggered front/rear configurations supported
• Centre bore: Hub-centric, sized to vehicle specification

Need a Different Size or Bolt Pattern?

The ZF-4 Two Piece Forged is available beyond the standard catalogue. If your vehicle requires a specific diameter, width, offset, or PCD not listed, contact us at [email protected] and we will confirm availability and lead time. We also offer an AI Wheel Design Service if you want a custom spoke concept or finish visualised before production begins.

Technical Specifications

• Manufacturing process: Two Piece
• Material: 6061-T6 aerospace-grade forged aluminium billet
• Machining: Multi-axis CNC — face, spokes, and hub flanges in one programme
• Yield strength: ≥276 MPa (standard for 6061-T6 solution heat-treated and aged)
• Design: a flowing multi-spoke design with curved spokes that sweep from the hub outward, tapering progressively toward the rim. The curvature introduces a directional quality — the wheel has a distinct rotational character that works particularly well on dark or metallic vehicles.
• Finish: The ZF-4 Two Piece is finished to client specification. Options include gloss or satin painted (any RAL/BS colour), brushed with anodising, polished face with painted barrel, and full polished. Two-piece construction allows independent finishing of face and barrel.
• Hub-centric fit: Yes — bore machined to vehicle hub diameter
• Origin: Manufactured in England, United Kingdom

ZF-4 Two Piece Forged — Design & Engineering Detail

Curved spoke geometry under cornering loads creates a combination of bending and torsion at the spoke root, which requires the cross-section to be deeper than an equivalent straight-spoke design. The ZF-4 compensates with a deeper spoke profile at the hub interface — the cross-section height increases by 22% compared to the ZF-3, maintaining equal stiffness while preserving the visual flow.

Why Full Billet Forged? The Technical Case

Full billet forging starts with a solid block of 6061-T6 aluminium. Under high press tonnage, the billet is shaped, establishing a grain structure aligned with the finished part's stress paths. Subsequent CNC machining removes material to achieve the final geometry. The result is a wheel with no porosity, no inclusions, and a consistent grain structure — properties that cannot be replicated in cast, semi-cast, or flow-formed processes. Yield strength exceeds 276 MPa, compared to 180–220 MPa in gravity-cast alloys. Billet forging is the manufacturing process used in motorsport, aerospace structural components, and the top tier of the custom wheel industry. The weight reduction vs. cast is real and measurable: a forged 20×10 monoblock typically runs 1.5–2.5 kg lighter than a cast equivalent in the same design, reducing unsprung rotating mass and improving the entire dynamics envelope — steering response, braking stability, ride quality, and acceleration.

ZF-4 Two Piece Design Language

The ZF-4 introduces curvature to the ZF range — the only model in the series where the spokes follow a swept arc rather than a straight radial line. Each spoke originates at the hub and curves outward, widening slightly as it approaches mid-radius before tapering back toward the rim. The arc gives the design a rotational direction — the ZF-4 appears to be spinning even when stationary. This kind of directional quality requires the manufacturer to produce both left and right-hand variants if exact symmetry is desired on a vehicle, though many builds use a single rotational direction across all four corners as a design choice. The curvature also makes the ZF-4 significantly more demanding to machine than a straight-spoke design — the CNC program must trace a non-linear path, tool engagement varies across the arc, and finishing passes require careful fixturing to prevent vibration artefacts in the machined surface. The result is a spoke surface that has a distinct topographic quality — concave on one face, convex on the other — that is only visible when the wheel is lit from an angle. Standard straight photography does not capture it; the ZF-4 rewards physical inspection. In two-piece form, the ZF-4 face gains additional aesthetic flexibility: the barrel is manufactured separately, allowing deeper concave profiles and wider reverse lips than single-piece machining permits. The face design remains identical to the Monoblock version, but the two-piece assembly means the barrel offset can be adjusted during the build rather than fixed at manufacturing stage.

ZF-4 Two Piece: Two-Piece Construction Advantages

The ZF-4 Two Piece brings the curved-spoke directional design into a construction that enables custom finish combinations on the face and barrel independently. Because face and barrel are separate components, each can be finished in a different process — a polished face against a satin black barrel, for instance, or a brushed face against a powder-coated inner. This flexibility is not available in Monoblock production where the entire wheel must pass through the same finishing process. The curved spoke geometry of the ZF-4 produces a rotational couple on the face-barrel joint under lateral load that is higher than a straight-spoke design of the same diameter — Quantum44 accounts for this in the hardware specification, using a larger bolt diameter and tighter torque settings than some simpler two-piece designs require. The joint assembly is therefore not user-serviceable with general garage tooling — disassembly and reassembly should be performed by a facility that has Quantum44's assembly documentation and the appropriate calibrated torque equipment.

ZF-4 Two Piece Target Platforms

The ZF-4 Two Piece enables the curved spoke design to be applied across builds where independent face and barrel finishing adds to the overall aesthetic. Builds pairing a polished or machined face against a contrasting satin or powder barrel are most common on Lexus LC platforms, modified BMW 8 Series builds, and custom Japanese domestic market vehicles imported to the UK. The two-piece format also simplifies fitment on vehicles with non-standard hub bore diameters — the barrel interface can be machined to a different bore without changing the face specification.

Vehicle Fitment Guide — Platforms the ZF-4 Two Piece Forged Was Designed For

The ZF-4 Two Piece Forged is built to order and fits any platform — PCD, offset, and centre bore are specified at order. Most commonly fitted to:

• BMW M-series: M3, M4, M5, M8 — 5×120; the ZF-4 suits performance platforms where the spoke design's structural and aesthetic character is a primary consideration
• Audi RS-series: RS4, RS5, RS6, RS7 — 5×112; confirm ET against wide-arch body kit if applicable
• Porsche: 911 (991, 992), Cayenne — 5×112 or 5×130 depending on model year and variant
• Mercedes-Benz AMG: C63, E63, S63, AMG GT — 5×112; common for track-oriented builds
• Custom / bespoke: Lamborghini, Ferrari, McLaren — centre-lock and custom-PCD variants available on request

Correct fitment is the buyer's responsibility — verify PCD, ET, centre bore, and tyre size against your vehicle specification before ordering. Hodoor World offers a pre-order fitment advisory service on request.

Other Bolt Patterns — Available to Order

In addition to the standard PCDs, the ZF-4 Two Piece Forged is available in the following bolt patterns to order:

• 5×108 — Ford ST/RS, Volvo V40/V60/V90, Jaguar F-Type, Citroën DS
• 5×114.3 — Honda Civic Type R, Lexus IS/RC, Nissan 370Z/GT-R, Infiniti Q50, Kia Stinger, Hyundai i30N
• 5×120 — BMW, Rolls-Royce, Land Rover Defender, Range Rover
• 5×130 — Porsche 911 (all variants), Cayenne (pre-2018), Panamera
• 5×112 — Audi, Mercedes-Benz, Volkswagen, Lamborghini (some models)
• Centre-lock — Porsche GT3/GT3 RS, Ferrari, Lamborghini — specify on enquiry

Non-standard PCD lead time is typically 4–6 weeks. Contact [email protected] with your vehicle details.

How the ZF-4 Two Piece Forged Compares

Explore the Quantum44 Lineup at Hodoor World

• Quantum44 ZF-1 Monoblock — full forged ZF-1 monoblock
• Quantum44 ZF-2 Monoblock — a five-spoke split forged design that bridges the gap between a traditional multi-spoke and a twin-spoke aesthetic
• Quantum44 ZF-3 Monoblock — a seven-spoke forged monoblock with a clean, restrained profile suited to executive and GT platforms
• Quantum44 ZF-4 Monoblock — same design in one-piece monoblock — lighter, more rigid
• Quantum44 ZF-6 Monoblock — the deepest concave design in the ZF range — an eight-spoke show-grade forged wheel for builds where visual depth is the priority
• Quantum44 SFF-2 — flow forged alternative — 20–21", three finishes, immediate availability
• Browse all forged wheels at Hodoor World

Can't Find the Right Wheel? Order Custom Forged

If the ZF-4 Two Piece Forged is close but not quite right — different finish, unusual offset, or a spoke pattern beyond the Quantum44 catalogue — Hodoor offers a custom forged wheel manufacturing service. We work with Quantum44 and other UK and European manufacturers to build one-off and short-run sets to exact specification. Lead time typically 4–8 weeks. You can also use our AI Wheel Design Service to visualise your concept before production begins.

How to Order

1. Contact Hodoor — email [email protected] with your vehicle make/model/year, required diameter, width, offset, and PCD
2. Specify your finish — colour, texture, and hardware finish confirmed in writing before production begins
3. Receive a quote and lead time — Quantum44 provides a confirmed build spec and production lead time (typically 4–6 weeks for monoblock, 4–8 weeks for two-piece)
4. Approve and pay deposit — production begins on deposit receipt
5. Dispatch and delivery — full tracking provided; international delivery typically adds 3–7 working days

Frequently Asked Questions

Is the ZF-4 Two Piece Forged available in any colour?
Yes — as a full billet forged product, the ZF-4 Two Piece Forged is finished to specification. Any painted, brushed, or polished finish can be specified. Contact [email protected] for details.

What PCDs does the ZF-4 Two Piece Forged support?
Standard PCDs are 5×112, 5×120, 5×114.3, 5×130. Additional bolt patterns are available to order — any PCD — built to order. Contact [email protected] with your vehicle's PCD to confirm.

How do I know what offset to choose?
Offset (ET) determines how far the wheel face sits from the hub mounting face. A correct ET ensures the tyre clears the suspension components and sits flush within the arch. The right ET depends on your vehicle's hub, brake caliper, and suspension geometry. Contact [email protected] with your vehicle details for a recommendation before ordering.

Is the ZF-4 available as a monoblock or two-piece?
Both variants are produced. The ZF-4 Two Piece features a separately constructed barrel, enabling deeper concave profiles and wider rim widths than the monoblock version. Both share the same face design. Order the Monoblock if you prioritise minimum wheel mass or want the single-piece construction for motorsport applications.

What colours are available on the ZF-4 Two Piece?
Any colour — the ZF-4 is finished to specification. Common choices include: Gloss Pearl White, Satin Carbon Grey, Brushed Titanium with clear, Polished face/Gloss Black barrel, Full Polished. Two-piece construction allows contrasting face and barrel finishes. Submit your spec to [email protected] for a quote.

Does Hodoor World offer a fitment advisory service?
Yes. If you are unsure about PCD, ET, width, or tyre sizing for your vehicle, contact us at [email protected] before ordering. We will confirm the correct specification for your platform.

Discover Hodoor World: Your Ultimate Car Customisation Destination

Hodoor World is an independent specialist in premium and custom forged wheels, sourcing directly from UK, European, and US manufacturers. Our catalogue spans flow-formed, fully forged, and multi-piece programmes — all with fitment advisory, direct dispatch, and global shipping. Browse the full selection at hodoor.world, read verified reviews on Trustpilot, or contact us at [email protected] for purchasing advice.

Wheel Care

Full billet forged wheels with a painted or polished finish require regular cleaning to maintain appearance and protect the surface. Rinse after each drive in wet or road-salt conditions. Use a pH-neutral wheel cleaner — acid-based products will attack anodised and polished finishes. Apply a ceramic wheel sealant every 3–4 months to protect the topcoat. For polished wheels, a dedicated metal polish applied monthly will prevent oxidation. Torque wheel nuts to your vehicle manufacturer's specification (typically 110–140 Nm for M14×1.5 fasteners on performance platforms) after fitment and again after 50 km.

ZF-4 Two Piece Forged — International Delivery

Hodoor World ships the ZF-4 Two Piece Forged worldwide. As a made-to-order product, production lead time is 4–8 weeks before dispatch. International shipping typically adds 3–7 working days. All orders ship with full tracking; customs declared at accurate value. Import duties and local taxes are the recipient's responsibility. For freight quotes to specific destinations, contact [email protected].