Customer-specification fitment guide for the Mercedes-AMG GT. 5x112, 66.6 / 66.56, hub-centric — referenced against recorded LFI customer builds and specified from the car outward.
LFI forged wheels for the Mercedes-AMG GT use 5x112 PCD, 66.6 / 66.56 centre bore, with width, offset, tyre support, and brake clearance matched to the actual car before production.
AMG GT Specification Notes
AMG GT fitment starts with 5x112 PCD, 66.6 / 66.56 mm hub-centric planning and a brake-clearance-first spoke profile. LFI reviews the exact GT, GT S, GT C or Roadster brake package before setting the staggered width, offset, tyre support and concavity.
Chassis-Matched Width, offset, and concavity specified to the vehicle — specified from measured vehicle requirements rather than shelf-size assumptions.
02
Brake Clearance Spoke profile, barrel contour, and backpad machined to the brake package on the exact car.
03
Forged Response Lower unsprung mass sharpens steering, braking feel, and ride control — immediately noticeable from the first drive.
Face profile is selected around brake clearance and load specification.
Featured Case
Customer FitmentReference
2020 Mercedes AMG GT-C Roadster CSF9 fitment
A recorded LFI customer specification. Final width, offset, tyre pairing, ride height, hardware seat and load specification are confirmed against the actual vehicle at order time.
The primary row is drawn from recorded LFI build data. Alternate rows are specification directions — brake template, tyre shoulder, load target, and ride height are confirmed at order time.
Direction
Wheel size
Wheel model
Best for
Notes
Primary
19x9 ET46 / 20x12 ET31
AL13 R80-109R AERODISC
Real LFI build record
LFI customer fitment record. Confirm tyre shoulder, brake template, ride height, and final offset.
Alternate
20x9.5 ET50 / 21x12 ET63
MF31
Customer-proven direction
LFI customer fitment record. Confirm tyre shoulder, brake template, ride height, and final offset.
Additional
20x9 ET47 / 21x12 ET45
CSF9
Customer-proven direction
LFI customer fitment record. Confirm tyre shoulder, brake template, ride height, and final offset.
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 Mercedes-AMG GT has a verified GAWR of 1080 kg — 540 kg per wheel at the axle. LFI targets 690 kg per wheel, providing meaningful reserve.
Torque Validation
Wheel strength is broader than 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
590 kg
1180 kg per axle
+9% vs 540 kg/wheel
Low reserve
Use only after exact axle data, tyre load, and duty cycle are confirmed.
690 kg
1380 kg per axle
+28% vs 540 kg/wheel
Preferred
Street, fast-road, and daily use.
790 kg
1580 kg per axle
+46% vs 540 kg/wheel
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 specification
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 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.
Japanese technical standard for light alloy wheels.
Used as a reference standard for relevant load and durability requirements.
VIA
Japanese third-party wheel registration and verification system.
Applies only to specific wheel models/specifications that are formally registered.
TUV
European technical testing or certification framework.
Applies only when a specific wheel/specification has supporting TUV documentation.
SAE
Common industry test framework for aftermarket wheel performance and impact evaluation.
Useful for impact and fatigue validation depending on market and specification.
Internal validation
LFI's own engineering and test process.
Used for bespoke specifications built from validated design families.
Static FEA
Computer-based engineering simulation.
Used before machining to evaluate stress, weight, torque load, and clearance.
Selected high-volume reference specifications may be supported by external lab reporting or third-party documentation. Bespoke Mercedes-AMG GT specifications are engineered from the same design families and reviewed through LFI's internal design, load, brake-clearance, and fitment-validation process. Customers can also review LFI's Testing & Compliance page for the broader testing-language context.
Critical fitment warning: do not order Mercedes-AMG GT wheels by model name alone. Confirm PCD, centre bore, brake package, hardware seat, tyre size, and ride height before production.
Reference test basis: CSF1 19x9 ET29 was tested to JWL Aug. 2014 conditions at the stated load.
Named lab route: the reference report runs through a TUV SUD accredited lab. Each custom order still gets its own load, brake, tyre, and fitment review.
Case Studies
Customer Fitment StoriesPhoto And Spec Cases
2020 Mercedes AMG GT-C Roadster CSF9 fitment
A recorded LFI customer specification. Final width, offset, tyre pairing, ride height, hardware seat and load specification are confirmed against the actual vehicle at order time.
2020 Mercedes AMG GT-C Roadster on CSF9.2020 Mercedes AMG GT-C Roadster on CSF9.2020 Mercedes AMG GT-C Roadster on CSF9.2020 Mercedes AMG GT-C Roadster on CSF9.2020 Mercedes AMG GT-C Roadster on CSF9.2020 Mercedes AMG GT-C Roadster on CSF9.
A recorded LFI customer specification. Final width, offset, tyre pairing, ride height, hardware seat and load specification are confirmed against the actual vehicle at order time.
Specification reference
A recorded build with full specification data. Installed photos to follow.
A recorded LFI customer specification. Final width, offset, tyre pairing, ride height, hardware seat and load specification are confirmed against the actual vehicle at order time.
Specification reference
A recorded build with full specification data. Installed photos to follow.
Mercedes-AMG GT BuildsFrom Singapore to Global Customers
LFI supports Mercedes-AMG GT customers with vehicle-specific forged wheel consultation, DDP supply where available, and direct Singapore / Malaysia support. Fitment recommendations are based on the confirmed vehicle, brake package, tyre target, load requirement, and intended use.
Fitment Consultation
LFI helps owners choose between OEM+, lightweight square, brake-clearance, show-style, and track-focused forged setups.
Road & Tyre Conditions
City roads, highways, potholes, wet-weather tires, ride comfort, and tyre availability can all change the best wheel and tyre recommendation.
Global Supply
DDP shipping available to major markets. The price quoted is the price paid — no surprise duties or taxes on delivery.
Singapore / Malaysia Direct Support
Singapore customers can visit LFI at 76 Playfair Road, #01-03, Singapore 367996 to view forged wheel samples, finishes, concavity profiles, and selected in-stock wheels.
Malaysia customers can order directly with LFI and request pre-production consultation for road use, track use, tyre availability, and brake clearance.
Are the Mercedes-AMG GT Forged Wheel Fitment Guide case studies real LFI customer builds?
Yes. Every case study is drawn from a recorded LFI customer build and specification.
What PCD does LFI confirm before machining?
Recorded LFI references point to 5x112 PCD. LFI confirms the exact car before machining.
How is the hub bore confirmed?
Recorded centre bore reference is 66.6. Hub-centric machining is confirmed per build.
What wheel size is a sensible starting point?
A recorded starting point is 19x9 ET46 / 20x12 ET31. Tyre pairing and clearance are confirmed per build.
Can LFI build this fitment without spacers?
Yes. Offset, brake clearance, and body clearance are machined into the wheel — no spacer dependency.
Why do some cases show customer images coming soon?
Some recorded builds have complete specification data while customer images are still pending.
What should I send before LFI quotes a build?
Model year, trim, brake package, tyre target, ride height, alignment, PCD, centre bore, hardware seat, centre-cap plan, finish, load target, and intended use.
Can Singapore, Malaysia, and international owners order directly from LFI?
Yes. LFI supports Singapore and Malaysia locally, and ships worldwide with remote fitment consultation.
Can I choose a different finish from the photos?
Yes. Every finish is custom — gloss, satin, brushed, polished, bronze, black, silver, and bespoke options are available.
Do I need to copy the exact photographed setup?
No. The photographed setup is a reference. Width, offset, concavity, finish, and tyre pairing are adjusted to your car and priorities.
Will these wheels clear big brakes?
Yes, when the caliper template, barrel profile, spoke shape, backpad, and offset are specified correctly. LFI validates brake clearance as part of the build.
Can LFI build a more comfortable daily setup?
Yes. A comfort-biased setup uses conservatively sized wheels and tyres with enough sidewall for road use.
Can LFI build a more aggressive show setup?
Yes. Fender clearance, steering lock, tyre shoulder, ride height, and alignment must be reviewed as a package.
Can I keep factory centre caps?
Yes, when the cap diameter, clip style, pocket depth, and face profile are specified in the build.
Are square setups available?
Yes. A square setup gives you tyre rotation, predictable handling, and a clean road package.
Are staggered setups available?
Yes. Staggered setups are available when the platform, tyre diameters, and drivetrain support them.
Why does LFI care about tyre shoulder shape?
Two tyres with identical printed sizes can fit differently. Shoulder profile affects fender clearance, steering lock clearance, and final stance.
Why not order by offset alone?
Offset alone does not describe a wheel. Width, tyre size, brake clearance, hub geometry, concavity, and ride height all determine whether the setup works.
Can LFI ship internationally?
Yes. International orders are supported with remote fitment consultation.
Start Your Mercedes-AMG GTBuild
Share your model year, brake package, tyre target, ride height, alignment, centre-cap plan, and finish target so LFI can confirm the forged wheel specification.
