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LFI Fitment Guide · Ford GT40

Ford GT40 ForgedWheel Fitment Guide

A specialist GT40 wheel guide for originals, continuation cars and high-end replicas - custom PCD, replica hub variation, deep polished lips, extreme negative offsets and modern 19/20 double-stagger forged fitment.

Written by Kevin Wang, Founder & Lead Engineer · La Forge Industries · Published · Updated

  • Custom PCD by chassis
  • Case build 5x112
  • 690 kg load target
  • 1,600 Nm torque target
  • Case CB 62.1 mm
  • Extreme negative offset
Discuss your Ford build See customer builds
Talk to LFI about a GT40 wheel build See the customer fitment
Full car Ford GT40 fitted with LFI custom deep-dish forged wheels
Photo-backed Ford GT40 customer build on LFI custom deep-dish forged wheels. Photo credit: stick_shift_studioz.
Deep-dishGT40 customer fitment case.
790 kgpreferred GT40 load target.
~1,800 NmGT40 torque-load case.
Overview

Deep-Lip GT40 FitmentIs Not Catalog Fitment

A GT40 is not a normal production-car fitment problem. Originals, continuation cars and replicas can use different hubs, PCDs, brake packages, body widths, suspension layouts and centre-cap hardware. A wheel that works on one GT40 can be completely wrong for another.

LFI builds GT40 forged wheels from the actual chassis data: PCD, centre bore, hub face, brake template, offset, lip depth, centre-cap requirement, tyre package and use case. For the production side behind that process, see How LFI Wheels Are Made.

01

Builder-specific hubs.
Some GT40s use Ford-style 5x114.3, some use pin-drive or centre-lock-style hardware, and this LFI case used 5x112.

02

Extreme offset leverage.
Deep lips and negative offsets look right, but they increase bending load at the hub pad, spokes and barrel.

03

Measure first.
The safest starting point is builder data or direct measurement - not a forum fitment copied from a different replica.

Quick Specs

Ford GT40Wheel Reference

Item GT40 fitment reality LFI case-study reference Production note
Platform type Original, continuation, replica or custom chassis Custom GT40 replica / continuation build Confirm chassis builder and hub design before quoting.
PCD No universal standard 5x112 mm Other cars may use 5x114.3, pin-drive, centre-lock-style or custom hubs.
Centre bore Builder-specific 62.1 mm Measure from the actual car or confirm from builder drawings.
Hardware Builder-specific Custom large centre-cap design Confirm lug, stud, knock-off or simulated centre-lock details.
Style direction Deep dish / double stagger 19x8 ET-50 + 20x12 ET-65 Extreme negative offsets need forged engineering and proper hub-pad design.
Important: do not order GT40 wheels by model name alone. Every replica or continuation project needs actual hub, brake, suspension and bodywork measurements.
Engineering Proof

Load And TorqueValidation Logic

Wheel strength is not a single number. Vertical load, braking torque, drive torque, spoke-root stress, hub-pad stress, and bolt-seat behavior are all part of the engineering package — validated together, not in isolation.

Why load rating still matters

The Ford GT40 Forged Wheel has a verified GAWR of 1200 kg — 600 kg per wheel at the axle. LFI targets 690 kg per wheel, providing meaningful reserve.

Torque Validation

Wheel strength is not only vertical load. LFI also reviews acceleration, braking, cornering, potholes, tyre grip, hub-pad stress, bolt-seat stress, spoke-root stress, and rim-barrel torque reaction against an approximately 1,600 Nm per wheel static torque load target.

For the full engineering story behind each wheel, LFI's How LFI Wheels Are Made page covers design, forging, CNC machining, finishing, and quality control.

Wheel load rating Per-axle equivalent Margin vs axle baseline Status How LFI positions it
690 kg 1380 kg per axle +15% vs 600 kg/wheel Green - Preferred Street, fast-road, and daily use.
790 kg 1580 kg per axle +32% vs 600 kg/wheel Blue - Extra reserve High-speed, harsh-road, heavy tyre, or extra reserve.
890 kg 1780 kg per axle +48% vs 600 kg/wheel Blue - Extra reserve High-speed, harsh-road, heavy tyre, or extra reserve.
Torque-load target: approximately 1,600 Nm per wheel under conservative dry-braking validation.
Validation load case Reference basis Suggested LFI target Why it matters
Radial vehicle load Vehicle mass, passengers, tyre package, and selected wheel load target 690 kg preferred target Vehicle mass and sustained road loading.
Torque load Conservative 1g dry braking check with 60% front bias ~1,600 Nm per wheel Loads the hub pad, bolt seats, spoke roots, and rim barrel.
Cornering load Lateral force from road grip, sticky tires, and fast-road or track use Application-specific Lateral loading under cornering.
Combined static load case Radial load + torque load + cornering load Application-specific Real-world loads are combined, not isolated.

Engineering Article

Why Radial-Load FEAAlone Is Not Enough

For forged wheel applications, vertical load is only one part of the engineering picture. LFI also reviews spoke-root stress, hub-pad loading, bolt-seat behavior, rim-barrel stress, and combined static road-load cases where relevant.

Read LFI Combined-Load FEA Article
Replica hub warning: do not assume your GT40 uses the same wheel spec as another GT40. Builder, suspension package, hub design, brake package and bodywork width can all change the final wheel.
Testing & Validation

Custom FitmentNeeds Real Validation

Term Meaning How it applies to GT40 custom wheels
JWL Japanese technical standard for light alloy wheels. Useful as a reference framework for strength, fatigue and impact expectations.
SAE J2530 Aftermarket passenger-car and light-truck wheel performance requirements. Relevant for impact and fatigue test logic where applicable.
TÃœV / third-party testing Independent laboratory or certification framework. Applies only where a specific wheel and specification has supporting documentation.
LFI internal validation LFI's own design, inspection and engineering review process. Used for bespoke GT40 wheels built from validated design families and raw forgings.
Static FEA Computer-based engineering simulation before machining. Used to evaluate stress distribution, spoke geometry, hub-pad strength, torque load, clearance and material placement.
For the broader testing framework, see LFI Testing & Compliance.
Real Customer Build

Selected Ford GT40LFI Fitment Case

This case is based on an actual LFI Ford GT40 customer fitment. Use it as an engineering reference, not a universal GT40 template.

Le Mans deep-lip GT40 fitment

The 20x12 ET-65 rear creates the huge outer-lip depth, but that geometry also needs careful material placement and hub-pad engineering. The 19x8 ET-50 front keeps the car visually balanced while opening access to modern tyre choices.

Ford GT40 side profile on LFI custom forged wheels in Singapore
Side profile with LFI custom deep-dish forged wheels.
Ford GT40 rear angle with LFI polished deep lip forged wheels
Rear view highlighting the 20x12 ET-65 fitment and polished outer lip.
Ford GT40 front angle on LFI custom deep-dish wheels
Front angle showing the 19x8 ET-50 front fitment and low GT40 stance.
Ford GT40 detail view with LFI deep-dish forged wheel fitment
Additional GT40 fitment view from the restored original customer image set.
Photo credit: stick_shift_studioz. The original GT40 image set is preserved and displayed as natural tiles.
Contact LFI for GT40 custom deep-dish spec
Global Support

Built from SingaporeFor Specialist GT40 Projects

LFI supports GT40 continuation and replica customers across Singapore, Malaysia, Australia, Japan, the United States, Europe and other collector markets. Because the platform is bespoke by nature, measurement data comes before production.

Fitment Consultation

Confirm chassis builder, suspension, brake template, hub detail, bodywork width, tyre target and stance direction before drafting.

Road & Track Use

Choose tyre diameter, load target, lip depth and construction direction based on whether the car is road-focused, show-focused or track-used.

Global Supply

LFI can supply bespoke GT40 forged wheels internationally, with final specification confirmed before CNC machining.

Singapore / Malaysia Direct Support

Singapore customers can visit LFI at 76 Playfair Road, #01-03, Singapore 367996 to view tangible forged wheel samples, physical finish options, deep concavity profiles and selected in-stock wheels.

View LFI on Google Maps
External References

GT40 WheelPlanning References

Reference What it supports Link
JWL / VIA Reference Context for JWL / JWL-T marking and VIA registration. JWTC VIA / JWL FAQ
TÃœV SÃœD Wheel Testing Third-party laboratory wheel testing context. TÃœV SÃœD Wheel Testing
SAE J2530 Aftermarket wheel performance requirements and test procedures. SAE J2530
Superformance GT40 Continuation / replica market context showing why builder-specific specs matter. Superformance GT40
FAQ

Ford GT40Wheel FAQ

Are the Ford GT40 fitments shown here real LFI customer builds?

Yes. The GT40 case study is based on an actual LFI customer fitment, but it should be treated as a reference case rather than a universal specification because replica and continuation chassis vary heavily.

What is the Ford GT40 bolt pattern?

There is no single universal GT40 bolt pattern. Depending on builder and hub package, a GT40 may use 5x114.3, pin-drive, centre-lock-style hardware or a custom bolt pattern. The LFI case shown here used 5x112.

What centre bore does a GT40 use?

Centre bore is builder-specific. The LFI case study used a 62.1 mm centre bore, but other GT40 continuation and replica cars can be different.

Can LFI build wheels for Superformance, RCR, CAV or other GT40 replicas?

Yes. LFI can build GT40 forged wheels for different replica and continuation platforms when the correct hub, brake, suspension, bodywork and tyre measurements are provided.

Why do GT40 wheels use such negative offsets?

The GT40 body has very deep front and rear clamshell shapes, especially at the rear. Negative offsets push the mounting pad inward relative to the wheel centerline, creating the deep outer lip needed to fill the bodywork.

Are extreme negative-offset wheels safe?

They can be safe when engineered correctly, but they should not be treated like ordinary cast wheels. Extreme negative offset increases leverage at the hub pad and spoke roots, so forged construction and engineering review are important.

Why use 19-inch front and 20-inch rear wheels on a GT40?

A 19 / 20 double-staggered setup opens access to modern high-performance tyre compounds and creates a strong visual rake while still allowing a deep-dish rear profile.

Can I keep a period-correct 15-inch GT40 look?

Yes, but tyre availability, tyre compound, brake clearance and performance expectations must be reviewed.

Do GT40 wheels need to be forged?

Forged construction is strongly preferred for bespoke GT40 applications because it supports custom offsets, deep lips, high strength, lower weight and better structural control than generic cast alternatives.

What information does LFI need before building GT40 wheels?

LFI needs the chassis builder, hub type, PCD, centre bore, brake template, suspension clearance, target tyre sizes, bodywork measurements, desired lip depth, centre-cap requirement, finish and intended road or track use.

Can LFI ship GT40 custom wheels internationally?

Yes. LFI supports international GT40 customers and can ship bespoke forged wheels globally after final measurements, drawings, finish and production specification are confirmed.

Start a Custom Build

Build the GT40 WheelAround the Actual Chassis

Send LFI your chassis builder, hub measurements, brake template, current wheel and tyre data, desired lip depth, centre-cap requirement and whether the priority is period appearance, modern road grip or track performance.

Contact LFI Engineering for GT40 wheels
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