LFIREX-0R SuperleggeraMonoblock Forged Wheel

The REX-0R Superleggera is built around one principle: every gram has to earn its place.

This is not about removing material blindly. The REX-0R uses a long-shaft Y spoke, deep pocketing, backpad reduction, Counter-Lip rim reinforcement and Takumi Beam™ spoke architecture to put aluminium where it works and take it out where it does not.

29% less local mass. 87% stiffness retained. 22% more stiffness per gram.

Engineering note

η_section = 0.869 / 0.714 = 1.217

0.714 mass retained after 28.6% local mass reduction; approximately 21.7% higher stiffness per gram.

This is not lightness by subtraction. This is lightness by structure.

The wheel built around useful mass

Some wheels are designed to look light. The REX-0R is engineered to be light where it actually matters: the spokes, the barrel and the way the whole wheel carries load from hub to rim.

Taking material off a wheel does not automatically make it better. Cut from the wrong place and you have made it weaker. Leave it in the wrong place and you are carrying dead weight. The REX-0R is built around the line between those two.

At the 18x10.5J ET45 reference fitment, the REX-0R Superleggera is approximately 7.3 kg per wheel. In the 17x7J reference build, it is approximately 5.6 kg per wheel. Final mass still changes with width, offset, bolt pattern, brake clearance, load target and machining depth.

Takumi Beam™ spoke architecture

The name comes from the Japanese kanji 工, a character tied to craft, making and engineered work. Look at it sideways and it already reads like a beam: top flange, vertical web, bottom flange. Takumi Beam™ takes that shape and makes it structural: narrow on the visible face, supported on the brake side, hollowed where the centre mass does less work.

Deliberate shaping. Not decorative cutting.

Compared with a solid tapered spoke section of the same outer envelope, the reference profile removes about 28.6% of local mid-section mass while retaining about 86.9% of local bending stiffness. Less wasted aluminium. More structural performance from every gram.

Section math

I = b d³ / 12

Bending stiffness scales strongly with section depth. The useful gain comes from keeping depth while removing centre mass that does less work.

Why Takumi Beam™ works

A symmetric I-beam is already efficient, but it has limits. Thin the web too much and stress starts to concentrate near the spoke root.

Takumi Beam™ flips the approach. The section is deliberately asymmetric: narrow on the visible face to save weight, wider on the brake side where the load path needs more structure. Same depth. Less centre mass. The result is a spoke that is more efficient, not just lighter.

That is the difference between a decorative pocket and an engineered spoke.

Long-shaft Y spoke architecture

A wheel does not just need to survive load. It needs to resist movement.

Deflection note

δ ∝ L³ / E I

Unsupported length matters fast. Shortening the flexible split region helps keep the rim controlled under cornering load.

Under cornering, the tyre tries to tilt the rim away from the hub. If the spokes allow that movement, the wheel gives away precision: camber shifts, turn-in softens and the contact patch gets vague.

Most split-spoke wheels divide early near the hub, creating two long, slender branches all the way to the rim. It can look elegant. Structurally, it leaves the longest unsupported span as the most flexible part of the wheel.

The REX-0R reverses that logic. One deep Takumi Beam™ main spoke carries the load most of the way to the rim before splitting into two short, wide-angle branches. The long section stays stiff. The split section stays short and braced.

Same visual family. Different engineering priority.

The fork is a brace, not a flourish

The fork is a brace, not a flourish. Where the spoke splits, the two branches and the rim arc between them close into a wide structural triangle. A narrow, near-parallel fork bends like two long cantilevers. Widen the angle and shorten the branches, and it starts behaving like a braced frame: far stiffer under drive and brake torque.

Brace note

k_bend / k_axial = 3I / A L² = 3(r_g / L)²

Once the branch is long relative to its section, bending stiffness falls away. A wider, shorter fork shifts more work into axial tension and compression.

This is the kind of detail radial-only simulation never catches. The wheel looks settled until you add real torque. Then stress piles at the spoke root. The wide fork answers it directly: two well-separated rim-side branch feet share the torque reaction across a broader base.

And it stays composed. A stiff structure with its mass kept inboard pushes resonances away from the low-frequency, high-energy range of cornering and braking. Less flutter. Steadier feel. Stiffness you can measure becomes confidence you feel through the wheel.

Frequency note

ω_n ∝ √(k_modal / m_modal)

Higher stiffness and lower participating mass help move relevant resonances away from the harsh cornering-and-braking range.

Combined-load engineering

Real wheels do not see one load at a time. Vehicle weight, cornering, braking, drive torque and tyre pressure all overlap. Lightweight wheels often fail not from the obvious load, but from the interaction between loads. The REX-0R is shaped around that interaction.

Load-case note

Radial load + lateral load + drive / brake torque + tyre pressure

The point is overlap: the wheel has to stay controlled when the loads arrive together, not only in a single radial check.

The long Takumi Beam™ main spoke controls the primary span. The short split branches brace the rim. The side-beam pocketing removes mass while preserving root support. The Counter-Lip reinforces the rim edge where movement wants to collect.

Every feature has a load-path reason.

The honest trade-off

The REX-0R Superleggera is not trying to be the thinnest-looking wheel in the catalogue. A long, delicate split-spoke design can be beautiful. It can also add a small amount of compliance that some drivers may prefer on a show-focused or comfort-focused build.

The REX-0R chooses a different priority. It gives more structure to the main spoke because that is where the stiffness lives. It splits late because that keeps the compliant branch length short. It uses Takumi Beam™ because the same mass can be made to work harder when the section follows the load path.

For a car built to be driven hard, that is the right trade. The wheel should hold the geometry the chassis was designed around. Not add softness of its own.

Founder Edition

As a Founder Edition, the REX-0R is built the way LFI would build a wheel for its own car: no unnecessary material, no spacer dependency, no compromises to simplify fitment.

Every set is forged and machined around your specific vehicle: diameter, width, offset, brake clearance, load target, bolt pattern, centre bore, concavity and finish.

The geometry is not adapted after the fact. It is built around the car from the start.