Polestar 4Forged Wheel Fitment
Polestar 4 EV forged wheel fitment guide for 21-inch square sizing, high-load forged construction, centre-bore setup, and EV tyre planning.
- 2025 Polestar 4
- LFI Polestar Design
- 21x9.5 ET40 square
- 5x108 / 63.4
-
Documented build
Build #22-3360 -
Wheel model
LFI Polestar Design -
Size
21x9.5 ET40 -
PCD / Bore
5x108 / 63.4 -
Fitment type
Spec reference -
Photos
Awaiting on-car media
Polestar 4Fitment Strategy
Polestar 4 fitment starts with the actual vehicle, brake package, ride height, tyre load index, and hub specification. This guide records the live LFI worksheet case and gives the sizing direction LFI will refine before production.
Confirm the car.
Model year, brake package, suspension height, and alignment are checked before production.
Confirm the wheel.
Width, offset, centre bore, load rating, concavity, hardware seat, and finish are built as a single specification.
Confirm the tyre.
Tyre section width, shoulder shape, rolling diameter, and load index decide whether the final stance is clean or compromised.
KnownBuild Data
| Area | Specification | Fitment note |
|---|---|---|
| Vehicle | 2025 Polestar 4 | Live Monday worksheet case, now moved into its own guide. |
| Wheel | LFI Polestar Design | Forged LFI wheel model, final profile confirmed against brake clearance. |
| Size | 21x9.5 ET40 | Reference customer specification. |
| PCD / Bore | 5x108 / 63.4 | Hub-centric specification confirmed before machining. |
Build #22-336021x9.5 ET40 square
Polestar 4 worksheet-backed specification
This case is recorded as an actual LFI customer fitment specification. Customer on-car images will be added only when full-car or installed-on-car media is available.
- INV2026-22-3360
- LFI Polestar Design
- 21x9.5 ET40 square
- 5x108 / 63.4
Wheel SizeStarting Points
| Setup | Use case | LFI notes |
|---|---|---|
| 20x9 ET38-42 square | Comfort-focused EV option with extra tyre sidewall. | Final offset, tyre model, load index, and brake profile are confirmed before production. |
| 21x9.5 ET40 square | Documented Polestar 4 customer specification. | Final offset, tyre model, load index, and brake profile are confirmed before production. |
| 22x9.5 ET38-42 square | Visual upgrade path after confirming tyre diameter and load index. | Final offset, tyre model, load index, and brake profile are confirmed before production. |
Load RatedFor The Vehicle
Wheel strength is matched to vehicle load, tyre load index, brake torque, and the intended duty cycle. LFI checks these values before machining and finishing each forged wheel set.
Load-rating margin
Candidate wheel load ratings are compared against the vehicle axle-load target so the final build has an appropriate reserve for road use, EV mass, passengers, and luggage.
Torque-load target
Brake torque is part of the wheel story. For this platform LFI uses a rounded static torque-load target of 2,600 Nm for engineering review.
| Candidate load | Margin vs axle baseline | Status |
|---|---|---|
| 790 kg | +4% | Road baseline |
| 890 kg | +17% | Preferred |
| 1050 kg | +38% | Extra reserve |
| Load case | Validation focus | Production check |
|---|---|---|
| Radial vehicle load | Vehicle mass, passengers, luggage, and tyre load index. | Wheel load rating selected for the final duty cycle. |
| Torque load | Static brake torque target of 2,600 Nm. | Centre pad, spoke root, and bolt pad reviewed together. |
| Cornering load | Tyre grip, wheel width, offset, and suspension geometry. | Spoke, lip, and barrel profile confirmed before machining. |
| Combined static load case | Radial, torque, and lateral demand considered as one wheel system. | Final LFI drawing is checked before production release. |
BeforeProduction
Brake clearance
Caliper envelope, barrel drop, and spoke clearance are checked against the chosen wheel face.
Tyre clearance
Tyre brand, section width, shoulder shape, rolling diameter, and ride height are reviewed together.
Hub hardware
Centre bore, PCD, hardware seat, and cap plan are locked before machining.
Do Not CopyBlindly
Polestar 4 fitment should not be copied from another car without checking ride height, brake package, tyre model, suspension clearance, and local load requirements. Use these rows as starting points, not as a universal guarantee.
Live LFIBuild Record
21x9.5 ET40 square - spec reference
Build #22-3360 is an actual LFI customer build record. Installed photos will be added when the customer supplies usable full-car or on-car media.
ForgedModel Direction
LFI Polestar Design
The documented Polestar 4 wheel model and fitment direction for Build #22-3360.
LFI CSF Series
A motorsport-inspired split-spoke family suited to brake-clearance planning and road or track duty cycles.
LFI Monoblock Series
A clean forged option for owners who want lower weight, bespoke finish, and platform-specific load rating.
Singapore BuiltWorldwide Supply
Duty Paid Shipping
LFI supports international wheel builds with DDP planning where available, export packing, and clear production documentation.
Singapore / Malaysia local support
Local customers can visit LFI in Singapore for fitment planning, finish review, and after-sales support.
ReferenceSources
Polestar
TUV SUD wheel testing
JWL wheel standard reference
Polestar 4Questions
What is the documented Polestar 4 customer build in this guide?
Build #22-3360 records a 2025 Polestar 4 using LFI Polestar Design in 21x9.5 ET40 square with 5x108 / 63.4 hub specification. Final tyre and clearance details are confirmed against the actual vehicle before production.
Can LFI build other Polestar 4 sizes?
Yes. LFI can adjust width, offset, centre bore, brake profile, finish, and wheel load rating after reviewing the vehicle, suspension height, tyre target, and brake package.
Why does this Polestar 4 guide not use the Monday media uploads as case photos?
The available media for this row was not suitable as a final on-car customer photo set. LFI keeps wheel-only, note, or engineering-only media out of fitment case galleries until full-car or installed-on-car media is available.
Does LFI confirm load rating for the Polestar 4?
Yes. LFI confirms wheel load rating, tyre load index, brake clearance, centre-bore configuration, and hardware seat before production.
Build YourPolestar 4 Wheels
Share your vehicle year, brake package, tyre target, ride height, alignment, centre-cap plan, and finish target so LFI can confirm the final forged wheel specification before production.