Premium forged mid-engine Porsche wheels, engineered in Singapore for Cayman and Boxster 987, 981, and 718 platforms, including 5x130 hub-centric machining, Porsche R14 ball-seat lug holes, staggered mid-engine tyre logic, GT4 brake clearance, lightweight forged construction, and selected LFI customer builds.
The Porsche Cayman and Boxster platforms are sensitive to wheel weight, tyre stagger, and hardware details because chassis balance is one of the car's main strengths.
Across 987, 981, and 718 generations, the key baseline remains consistent: 5x130 PCD, 71.6 mm centre bore, M14x1.5 hardware, and the Porsche-specific R14 ball-seat lug profile. LFI machines these details directly into the wheel rather than relying on generic conical-seat assumptions.
LFI manufactures bespoke forged aluminium wheel setups for Cayman and Boxster owners who want accurate Porsche fitment, reduced unsprung mass, brake clearance, track durability, OEM centre-cap compatibility, and a safer alternative to generic aftermarket wheels.
Platform first.
Confirm the exact generation, body style, hub architecture, and brake package before choosing wheel width or offset.
Fitment is a system.
Wheel diameter, width, offset, tyre size, load target, brake clearance, and hardware seat must be matched together.
Real builds guide the range.
LFI uses selected customer specifications to separate practical road fitments from aggressive show, track, or widebody-only setups.
Porsche fitment rule: order by exact vehicle, brake package, tyre target, and intended use, not by model name alone.
Important note: Many generic aftermarket wheels use a 60-degree conical lug seat. Porsche factory hardware uses R14 ball seats. The lug-seat profile must be correct.
This 981 Cayman REX-06 V2 build highlights a lightweight 20-inch staggered setup with strong visual presence, customer-backed media, and a clear upgrade path for Porsche Cayman / Boxster owners.
This 981 REX-06 V2 build shows how a 20-inch Porsche setup can still be engineered around low weight and track response. The stagger preserves mid-engine balance while giving the car a strong street presence.
| Platform | Use case | Wheel size | Recommended tyre size | Notes |
|---|---|---|---|---|
| 987 | 18-inch track / backroad grip | Front: 18x8.5 ET45 Rear: 18x10.0 ET35-40 |
235/40R18 + 265/40R18 | Best for sidewall, steering feel, and older 987 mechanical grip. |
| 987 | 19-inch flush street | Front: 19x8.5 ET45 Rear: 19x10.0 ET35 |
235/35R19 + 265/35R19 | Standard-body golden-ratio OEM+ stance. |
| 981 | 19-inch lightweight track | Front: 19x8.0-8.5 ET45-47 Rear: 19x9.5-10.0 ET35-40 |
235/40R19 + 265/40R19 | Best balance of track sidewall, tyre cost, and response. |
| 981 | 20-inch flush street / track stagger | Front: 20x8.5 ET42-45 Rear: 20x10.0 ET36-40 |
235/35R20 + 265/35R20 | Best visual upgrade while preserving staggered mid-engine balance. |
| 718 GT4 | 19-inch hardcore track | Front: 19x9.5 ET48 Rear: 19x11.0 ET48 |
245/35R19 or 265/35R19 + 295/30R19 or 305/30R19 | Track-focused brake-clearance setup with optional knurled beads. |
| 718 non-GT4 | 20-inch street performance | Front: 20x8.5 ET45 Rear: 20x10.5 ET40 |
Vehicle-specific | Supports wider rear tyre for turbo torque and stronger stance. |
For most 987 / 981 road cars, LFI recommends staying with staggered 18-inch, 19-inch, or 20-inch sizing depending on tyre and ride priorities. For 718 GT4 use, brake clearance and tyre sidewall usually make a 19-inch track package the stronger choice.
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.
The This platform has a verified GAWR of 1200 kg — 600 kg per wheel at the axle. LFI targets 690 kg per wheel, providing meaningful reserve.
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. |
| 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
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.
Wheel testing and certification terms are often used together, but they do not always mean the same thing. LFI separates external certification, lab testing, internal validation, and FEA review so Porsche owners understand what applies to their exact custom specification.
| Term | Meaning | How it applies to LFI custom forged Porsche wheels |
|---|---|---|
| JWL | Japanese technical standard for light alloy wheels. | Used as a reference framework for relevant wheel strength, fatigue, and impact requirements. |
| VIA | Japanese third-party wheel registration and verification system. | Applies only to specific wheel models and specifications that are formally registered. |
| TÃœV | European technical testing or certification framework. | Applies only where a specific wheel and specification has supporting TÃœV documentation. |
| SAE | Common industry framework for aftermarket wheel impact and fatigue testing. | Useful for validating strength and impact performance depending on market and specification. |
| LFI internal validation | LFI's own engineering, test, and inspection process. | Used for bespoke specifications built from validated design families, materials, load targets, and machining processes. |
| Static FEA | Computer-based engineering simulation before machining. | Used to evaluate stress distribution, spoke geometry, hub-pad strength, torque load, clearance, and material placement. |
In the custom forged segment, every width, offset, bolt pattern, brake-clearance profile, and lug-seat geometry can become a separate specification. LFI combines selected third-party reference testing with consistent material, engineering, in-house validation, and FEA processes across bespoke variants.
The following examples are based on LFI customer fitments across the Porsche 987, 981, and 718 platforms. Photo-backed builds appear first, while unphotographed or specialty cases are retained as specification references.
This TRS-03 case is a photo-backed 18-inch lightweight Cayman formula. It improves sidewall, grip compliance, steering response, and rotational mass while preserving proper mid-engine stagger.
This 981 CSF6 build balances track usability, lower rotational mass, correct staggered handling, and Porsche-specific R14 ball-seat machining. The 19-inch format keeps tyre cost and sidewall reasonable while supporting sharper response.
This 981 REX-06 V2 build shows how a 20-inch Porsche setup can still be engineered around low weight and track response. The stagger preserves mid-engine balance while giving the car a strong street presence.
This 987.2 case is a deep-concave modular visual reference. It demonstrates how a standard-body 987 can run 19x8.5 front and 19x10 rear with a flush stance while retaining Porsche centre-cap compatibility.
This is the standard-body 987.2 golden-ratio street fitment: 19x8.5 ET45 front and 19x10 ET35 rear. It improves stance while preserving the mid-engine staggered balance.
This case mimics a classic multi-piece motorsport look while using modern forged construction and Porsche-specific hub and lug-seat machining.
This 987.2 customer build uses the same 19x9.0 front and 19x10.0 rear specification as the brushed silver setup, but changes the visual direction with a Satin Gunmetal finish for a more understated OEM+ motorsport look.
This is a highly specialized widebody reference. The negative ET-15 rear offset is not for standard-body cars; it was engineered to fill large aftermarket overfenders and create a massive outer-lip appearance.
This 718 GT4 track case drops to 19-inch diameter for sidewall and curb compliance while preserving brake clearance. Knurled beads are specified to reduce tyre slip on the rim under hard braking and high lateral load.
This 981 build gives a standard 5-lug Cayman the motorsport-style centre-lock appearance by using a bespoke aluminium centre-cap assembly that covers the 5x130 lug holes cleanly.
This 18-inch setup is for purists who want sharper steering, lower mass, and more tyre sidewall on the older 987 chassis. It is the most mechanical-grip-focused direction in the 987 family.
These wheel models are selected around the vehicle type instead of a generic forged-wheel fallback.
Premium performance fitments where response and brake room matter.
Aggressive motorsport face for wide tires and larger brakes.
Magnesium option for serious unsprung-mass reduction.
LFI supports Porsche Cayman / Boxster 987 981 718 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.
LFI reviews staggered sizing, tyre model, brake clearance, R14 ball-seat hardware, centre-cap pocket, track use, and whether the build is for road, GT4, widebody, or circuit driving.
Recommendations can be adjusted for rough-road durability, tyre sidewall, semi-slick tyre use, wet-road driving, track kerbs, tyre availability, and inspection expectations.
LFI builds custom forged Porsche wheels with 5x130 / 71.6 mm hub-centric machining and Porsche R14 ball-seat compatibility for international customers.
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 before ordering.
Malaysia owners can order directly with LFI and request fitment consultation for highway use, pothole resistance, tyre availability, and regional Porsche fitment priorities.
| Reference | What it supports | Link |
|---|---|---|
| Porsche owner's manual / vehicle label | Factory wheel torque, tyre pressure, load rating, and approved tyre-size context. Use the exact model-year owner's manual and certification label as the final vehicle-specific reference. | Porsche vehicle information |
| JWL / VIA wheel-testing framework | General strength, impact, and fatigue-test context for light alloy wheels. Certification status depends on exact wheel model and specification. | JWL / VIA reference |
| SAE aftermarket wheel-testing references | Impact and fatigue-test context for aftermarket wheel validation. Useful for understanding test categories, not as a substitute for exact wheel-spec documentation. | SAE J2530 |
| LFI Combined-Load FEA article | Explains why radial load alone is not enough for performance forged wheel simulation. | Read LFI article |
Yes. The case studies in this guide are based on selected LFI customer fitments for Porsche 987, 981, and 718 Cayman / Boxster applications, including road-use, lightweight track, GT4, and widebody specifications.
The Porsche Cayman and Boxster 987, 981, and 718 platforms use a 5x130 mm bolt pattern.
The centre bore is 71.6 mm. LFI recommends true hub-centric machining for vibration-free street and track use.
These platforms use M14x1.5 wheel hardware with a Porsche-specific R14 ball-seat lug profile.
The factory wheel torque specification is typically 118 lb-ft / 160 Nm.
Only if the wheel is machined for the correct R14 ball-seat profile. Do not use Porsche ball-seat bolts on a 60-degree conical-seat wheel.
Yes. Because of the mid-engine layout, Cayman and Boxster platforms normally need a wider rear wheel and tyre to preserve the intended handling balance.
A strong 987 track setup is 18x8.5 ET45 front and 18x10 ET35-40 rear with 235/40R18 and 265/40R18 tires.
A strong 981 street setup is 20x8.5 ET42-45 front and 20x10 ET36-40 rear with 235/35R20 and 265/35R20 tires.
A strong 718 GT4 track setup is 19x9.5 ET48 front and 19x11 ET48 rear, with tyre width selected around brake clearance, camber, and intended tyre model.
No. LFI machines the required offset directly into the forged wheel specification, avoiding spacer dependency, vibration risk, and additional hardware stack-up.
Yes. LFI can machine the centre cap pocket to accept OEM Porsche crest centre caps when requested during order drafting.
LFI forged wheels can be engineered for track use with appropriate load target, brake clearance, tyre sizing, and optional knurled beads to reduce tyre slip on the rim.
Knurled beads are textured bead-seat areas designed to reduce tyre slip on the wheel under hard braking, acceleration, and cornering.
LFI positions 690 kg per wheel as a practical road-use target for many Cayman / Boxster builds. For GT4, track, sticky-tyre, or harder-use builds, 790 kg can be evaluated where the wheel family allows it.
Cayman and Boxster wheels are loaded by braking, acceleration, cornering, kerb strikes, and tyre grip. Torque load helps evaluate the hub pad, bolt seats, spokes, and barrel beyond vertical load rating alone.
Yes. LFI is based in Singapore and supports Porsche Cayman / Boxster owners in Singapore, Malaysia, and international markets. Singapore customers can visit the LFI showroom to view wheel samples, physical finishes, concavity profiles, and selected in-stock wheels. Opening hours are Monday, Wednesday, Thursday, and Friday from 10:00 AM to 6:00 PM; Tuesday and Saturday are by appointment; Sunday is closed.
LFI should confirm chassis generation, exact model, brake package, tyre target, ride height, centre cap preference, lug hardware target, intended use, and whether the build is street, track, GT4, or widebody.
Start a Custom Build
Every LFI Porsche wheel is built to order based on exact chassis generation, wheel size, offset, brake clearance, tyre size, lug-seat profile, centre cap target, finish, load target, and intended use.
To begin a custom Cayman or Boxster forged wheel build, send the LFI team your exact model, brake package, tyre target, preferred wheel diameter, suspension height, and whether your priority is lightweight track use, OEM+ street stance, GT4 clearance, or widebody fitment.