The Short Version
- 4×100 throughout, both nameplates, both generations.
- The 2013–2019 cars have no published bore — and neither does the Mitsubishi eK they share a platform with.
- The current Roox is fully documented at 56 mm. The current Dayz is only partly documented.
- 56 mm is the Nissan-Mitsubishi joint-venture figure, not the 54 used by Suzuki and Daihatsu.
Both Sides Went Dark Together
We published recently that the Mitsubishi eK’s hub bore stopped being published in 2013, when the eK moved to the Nissan-Mitsubishi joint platform, and only reappeared in a July 2025 database refresh.
The obvious question was whether the Nissan-badged twin filled the gap. We have found five badge-twin pairs where one page carries a figure the other lacks, so it was a fair hope.
It does not. The Nissan side has the same gap:
| Model | Chassis | Period | PCD / Holes / Bore | Rows |
|---|---|---|---|---|
| Dayz gen 1 | B21W | 2013–2019 | 100 / 4 / Not researched | 179, all blank |
| Dayz Roox gen 1 | B21A | 2014–2020 | 100 / 4 / Not researched | 198, all blank |
| Dayz gen 2 | B43W–B48W | 2019– | 100 / 4 / Partly 56 | mixed — e.g. B45W has 6 rows at 56 and 18 blank |
| Roox gen 2 | B44A, B45A, B47A, B48A, BB1A–BB6A | 2020– | 100 / 4 / 56 | 188, all populated |
So the whole first generation of the joint venture — Nissan and Mitsubishi badges alike, six years of production — has no published hub bore anywhere.
The Patchy Middle
The current Dayz is the odd one. Within a single chassis code — 4AA-B45W, for instance — roughly a quarter of the grade rows carry 56 mm and the rest are blank.
Looking at the grade names, the populated and blank rows appear to describe the same specifications with the words in a different order. That reads like duplicate entries where only one copy was updated rather than a genuine difference between grades.
We cannot confirm that without opening every row, so we are reporting it as it appears. The practical position: 56 mm is the figure wherever the database gives one, on both the Dayz and the Roox, and the blanks look like an artefact rather than a different hub.
Fifty-Six, Not Fifty-Four
Worth stating plainly because it is the useful part.
Where the joint-venture cars are documented, they read 56 mm — matching Mitsubishi’s own kei convention and Honda’s, and differing from the 54 mm used by Suzuki and Daihatsu.
So a Spacia or Tanto wheel will bolt to a Dayz and sit two millimetres loose. Given how much second-hand kei wheel stock moves without a stated bore, and how similar these cars look, this is a real risk in this specific market.
Note that our source shows a plain 56 here where the eK’s refreshed rows show 56.1. That is very likely the same hub recorded to different precision.
The Older Roox Is a Different Car
A trap on the same page. Alongside the joint-venture Roox, the database carries an earlier ML21S Roox from 2009 to 2013 — a Suzuki Palette rebadge, nothing to do with the Nissan-Mitsubishi venture, and it reads 4×100 / 54 mm.
Same nameplate, different donor, different bore. Read the chassis code: ML21S is Suzuki-derived at 54; B21A and B44A onward are Mitsubishi-derived at 56.
This is exactly the pattern we map in our rebadge reference.
Importing
The Dayz launched in 2013 and the Dayz Roox in 2014, so both become eligible for US import from 2038 onward.
Neither was sold outside Japan. They are ordinary, extremely numerous kei cars, and their interest to an overseas buyer is practical rather than romantic.
What We Could Not Verify
- Hub bore for the entire 2013–2019 generation, on either badge.
- Whether the current Dayz’s mixed 56-and-blank rows reflect a data-entry artefact or a real difference. The duplicate-looking grade names suggest the former.
- Exact production date boundaries per chassis sub-code — the aggregate does not carry them consistently.