Hart Forged wheel on Kaizen, Akira Nakai's RWB Porsche 997, low angle at JHB Idle Expo 2026

Hart Forged × Racing Hart Concepts

Forged Once.
Never Repeated.

In collaboration with Akira Nakai, Hart Forged designed, forged, and fitted a single wheel for a single car — built inside the live timeline of JHB Idle Expo 2026, with no production run to follow.

Role
Design & Forging Partner
Timeline
[INSERT TIMELINE]
Location
Johannesburg, South Africa
Team
[INSERT TEAM SIZE]
Collaborator
Akira Nakai
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The Brief

One wheel, built to stand next to a builder who doesn't need the help.

Racing Hart Concepts wanted Hart Forged's first flagship statement to answer one question directly: could the brand's forging capability stand next to Akira Nakai's build philosophy without either side softening the other. The wheel needed to read as a genuine collaboration — not a rim built to spec and shipped in for a photo.

  • Design and forge a 1-of-1 wheel for Kaizen, Akira Nakai's Porsche 997 Carrera S (Black Edition) RWB widebody build — matched to his direction for stance, clearance, and proportion.
  • Deliver a fully forged, road-legitimate spec — not a display-only piece — despite the compressed build window.
  • Complete the build live, in public, across the JHB Idle Expo 2026 floor, ending in a reveal in [INSERT REVEAL DATE — public coverage points to early August 2026].
  • Produce a wheel that carries Hart Forged's own design language, not a reproduction of an existing Racing Hart pattern.

Constraints

Timeline
[INSERT TIMELINE] from first CAD to final fitment, with no slip on the reveal date.
Fitment
Offset and lip width dictated by the finished widebody, several dimensions only confirmed once the car itself was in Akira Nakai's hands.
Visibility
Key stages of forging, machining, and fitment took place on the expo floor — no re-shoots, no second attempts.
Provenance
The wheel had to hold up as a genuine forged product under scrutiny from an audience that knows the difference.

The Build

Seven stages, one continuous build.

From first concept sketch to the moment the wheel turned under expo lights — no stage repeated, no stage skipped.

  1. 01

    Concept & Briefing

    Design direction set jointly with Akira Nakai: proportion, stance, and how the wheel should sit inside the finished widebody rather than sit on top of it.

    Akira Nakai backstage at JHB Idle Expo 2026, mid-build
  2. 02

    CAD & Fitment Modelling

    The design translated into a forged-spec model — barrel profile, spoke geometry, and lip depth resolved against Kaizen's confirmed offsets and arch clearance.

  3. 03

    Forging

    The barrel and face forged from [INSERT MATERIAL, e.g. 6061-T6 aluminium billet] under [INSERT PRESSURE / TONNAGE] of pressure — the stage that sets the wheel's grain structure and, with it, its strength.

    [INSERT VIDEO: forging press in operation]
  4. 04

    CNC Machining

    Barrel, face, and lip cut to final geometry. Tolerances held to [INSERT TOLERANCE SPEC] across every mounting and sealing surface.

  5. 05

    Finishing

    Surface treatment applied by hand: [INSERT FINISH PROCESS, e.g. brushed and clear-coated]. Chosen for how it holds up under expo lighting and daily use, not just under a studio light.

  6. 06

    Fitment & Final Assembly

    Barrel, face, and hardware assembled to [INSERT ASSEMBLY SPEC], torqued and set to final offset, then mounted to Kaizen for the first time.

    Kaizen on stands mid-fitment, rear brake and hub exposed ahead of the final wheel mount, JHB Idle Expo 2026
  7. 07

    Expo Reveal

    The finished car rolled out on the JHB Idle Expo 2026 floor on [INSERT REVEAL DATE — public coverage points to early August 2026], the first and only public appearance of the wheel in its finished state.

    Kaizen on the JHB Idle Expo 2026 floor beneath the RAUH-Welt BEGRIFF Africa signage
    [INSERT VIDEO: expo reveal reel]

Key Decisions

Three decisions that shaped the wheel.

A 1-of-1 build carries no fallback spec. Every major decision was made once, under the same constraints as the rest of the build.

Construction

Monoblock Multi-Piece

Chosen: multi-piece construction, forged in [INSERT NUMBER]-piece configuration.

Why

A monoblock forging would have been lighter and simpler to finish inside the timeline. A multi-piece build — barrel, face, and lip forged and machined separately — took longer to assemble but kept width and offset adjustable until late in the build, a decision made necessary by a widebody spec that wasn't finalised until Akira Nakai had the car in front of him. It also let the wheel carry a visible split line — a direct reference to Racing Hart's own split-rim heritage, made deliberate rather than incidental.

Width & Offset

Conservative Fitment Full Concave

Chosen: full concave fitment, set to [INSERT WIDTH / OFFSET SPEC].

Why

A conservative width and offset would have de-risked clearance against the widebody arches and shortened the fitment stage. A more aggressive, deeply concave fitment carried real risk of rub or misalignment with no time to re-cut. The chosen fitment was resolved directly against Akira Nakai's ride height and arch fill rather than a generic clearance margin — the wheel was fitted to this car, not sized to fit most cars.

Finish

Polished Brushed

Chosen: [INSERT FINISH, e.g. hand-brushed with a low-sheen clear coat].

Why

A mirror-polished finish reads well in studio photography but shows every mark within days of real use, and reflects hard under the mixed lighting of an expo floor. A brushed finish carries more texture and less glare, at the cost of some outright shine — selected for how it would read consistently across expo lighting, daylight, and the wheel's ongoing use after the show, not for how it would look in a single hero shot.

Evidence

Documented from the forge floor to the reveal.

Coverage follows the build as closely as the finished wheel — the forging press, the fitment checks, and the moment the car left the stand.

Official RAUH-Welt BEGRIFF x Hart Forged key art for Kaizen, Africa's first RWB build, JHB Idle Expo 2026
[INSERT IMAGE: forging press, barrel mid-forge]
[INSERT IMAGE: CNC machining, face profile being cut]
Close-up of the finished multi-piece forged wheel, mounted
Akira Nakai's hand-drawn signature on Kaizen's hood ahead of the reveal
Kaizen on the JHB Idle Expo 2026 floor, front three-quarter, low angle
Akira Nakai hand-fitting Kaizen's fender live, JHB Idle Expo 2026 crowd looking on
Kaizen mid-build in front of the JHB Idle Expo 2026 crowd, hood up, engine bay exposed
The finished Hart Forged wheel and tyre, off the car, on the JHB Idle Expo 2026 floor
[INSERT VIDEO: expo reveal reel — 60–90 second cut, forge floor to reveal]

“A milestone for Hart Forged. A milestone for African automotive culture.”

Hart Forged, via @racinghartconcepts

[INSERT QUOTE: Akira Nakai — reaction to the finished wheel]

Akira Nakai, RWB

Specification

Full forged spec, confirmed at final fitment.

Design
[INSERT DESIGN NAME]
Construction
[INSERT — e.g. 3-piece forged]
Material
[INSERT MATERIAL]
Diameter
[INSERT DIAMETER]
Width (Front / Rear)
[INSERT WIDTH F/R]
Offset (Front / Rear)
[INSERT OFFSET F/R]
Bolt Pattern (PCD)
[INSERT PCD]
Centre Bore
[INSERT CENTRE BORE]
Finish
[INSERT FINISH]
Weight
[INSERT WEIGHT, if disclosed]
Fitment
Porsche 997 Carrera S (Black Edition) — RWB widebody, “Kaizen”
Build Partner
Akira Nakai

Specifications reflect this 1-of-1 build and its specific fitment. Custom builds are specified individually for each car.

Our Role

What Hart Forged owned.

  • Design direction and CAD, developed jointly with Akira Nakai's fitment requirements
  • Forging, CNC machining, and finishing, in-house
  • Fitment engineering against the widebody's confirmed offsets
  • On-site assembly, QA, and final torque and fitment at the expo

What We'd Refine

Three lessons for the next one.

  • Fitment data arrived late because the widebody itself was still evolving; an earlier checkpoint with Akira Nakai's team on fitment would have bought back time in machining.
  • Documenting the forge floor properly while running a live build competed for the same hands — a dedicated capture role is the fix next time.
  • Building in public removes the option to quietly redo a stage; worth budgeting contingency time into the schedule itself, not only the fitment.

Start a Custom Build

This wheel was built for one car. A custom build starts the same way — with a car, a brief, and a conversation about what the wheel needs to do before anything is drawn.

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Hart Forged wheels are sold and fitted exclusively through authorised Racing Hart Concepts retailers. If a listing doesn't originate from an authorised retailer, it isn't one of ours.

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