Staggered by diameter as well as width, 20×9 front to 21×12.5 rear, so the two faces share no tooling and no machining programme. The concave profile is the part that cannot simply be scaled between them: ET30 on a 9-inch front leaves roughly 84 mm from the mounting face out to the rim edge, while ET40 on the 12.5-inch rear leaves closer to 120 mm, so the rear curve has around 35 mm more depth to travel through and still has to read as the same design once both wheels are on the car. Front and rear run different hub bores as well, 57.1 mm and 66.5 mm, on one shared 5×112 pattern.
| Size — Front | 20/21" × 9.0" |
|---|---|
| Size — Rear | 20/21" × 12.5" |
| PCD | 5×112 |
| Offset — Front | ET30 |
| Offset — Rear | ET40 |
| Centre Bore | 57.1 / 66.5 mm |
| Construction | 1PC Monoblock |
| Material | 6061-T6 |
| Finish | Gloss Black |
| Weight | 11.5 / 12.6 kg |
| Load Rating | 750 kg |
| TPMS Provision | Yes |
| Runout | Under 0.01" (100% tested) |
| Tooling | None — no mould, no setup fee |
| MOQ | 4 pcs, mixed sizes accepted |
That is the part of this build worth talking about. The specification itself is straightforward: 20/21×9.0, 5×112, ET30, 57.1 / 66.5 mm bore, Gloss Black.
Forging gives a denser grain structure than a cast wheel of the same weight, which is why the spoke sections can be cut this thin without losing load capacity. This one is rated to 750 kg.
Every set ships with a serial engraved with size, offset, centre bore and load rating, tied to its QC record.
