Why This Page Exists
Every fitment figure on this site comes from the two Japanese factory wheel databases. They are the sources the Japanese trade uses and they are very good.
They also stop. Working through a few hundred vehicles, we have now mapped where — and it is worth writing down, because the cars that fall outside the coverage are disproportionately the ones people most want to import.
Coverage Begins Around 1989
That is the headline. Repeatedly, on model after model, the earliest dated row we find is 1988 or 1989, regardless of when the car actually went on sale.
| Model | Actually launched | Database coverage begins |
|---|---|---|
| Nissan Bluebird | 1957 | 1989 (U12) |
| Toyota Starlet | 1973 | 1989 (EP82) |
| Subaru Leone | 1971 | November 1989 |
| Toyota Crown | 1955 | 1988 (S130) |
| Nissan Leopard | 1986 | August 1988 |
| Toyota Soarer | 1981 | 1990 (Z20 tail end) |
| Mitsubishi Debonair | 1964 | 1989 |
So the practical rule: if your car is older than about 1989, expect the data not to exist — even if the model itself has a page.
Cars That Are Entirely Absent
These have no rows at all, not blank ones. We checked the manufacturer indexes in full.
- Datsun / Nissan Bluebird 510, 610 and 810. The Bluebird page contains only U12, U13 and U14 codes. We also checked the separate “Datsun” page in case it was filed there — that turned out to be the 1990s Datsun pickup.
- Toyota Starlet KP60 and KP61, the rear-drive cars. The Starlet page holds only the front-drive EP and NP codes.
- Toyota Soarer Z10.
- Honda City AA/VF, first generation — including the Turbo II “Bulldog”. No GA1 either.
- Daihatsu Charade, all generations, including the GTti. The model page does not exist.
- Daihatsu Rocky F300, the body-on-frame original. “Rocky” on these databases is only the 2019-onward crossover.
- All Isuzu passenger cars. Isuzu does not appear on either manufacturer index at all — no Gemini, no Piazza, nothing.
- Toyota Crown S120 and earlier.
- Subaru Leone RX and RX-II, and every Leone before November 1989.
- Toyota Carina GT-R (the 4A-GE car), which predates the Carina page’s window.
- Mazda Xedos 6 — expected, since it is an export badge and these are domestic tables.
Why the Gaps Are Where They Are
Two reasons, and neither is a criticism.
These databases are maintained commercially, for a working trade. A tyre and wheel shop in Japan needs data for cars people still drive and still fit wheels to. The commercial case for cataloguing a 1970 Bluebird is thin.
Isuzu is a special case. It left the Japanese passenger-car market in 1993 and has been commercial vehicles and diesel engines since. Cataloguing a passenger-car line that ended a generation ago, from a maker that no longer makes passenger cars, is not going to happen.
The irony is that these are precisely the cars now hitting 25 years and getting exported. The data thins out exactly where import interest thickens.
What We Do About It
We do not fill the gap. There are plenty of places that will give you a number for a 510 or a KP61 — fitment calculators, aggregators, search summaries — and over this series we have caught those sources being wrong repeatedly on cars where we could check. A wrong PCD, an invented bore, the ubiquitous 64.1 mm attached to something nobody has ever measured.
When we cannot verify, there is no reason to believe they suddenly become reliable. So we publish the gap, as we did for the Isuzu Gemini.
An unverified number is worse than no number, because it stops you checking.
What You Do About It
Measure the car. It takes ten minutes and it produces better data than anything published.
- Count the studs.
- Measure the bolt circle. On four studs, measure centre-to-centre between two opposite studs — that is the PCD directly. On five, measure from the centre of one stud to the far edge of the hole two positions round, which distinguishes 100 from 114.3 easily enough.
- Measure the hub register, the raised machined circle the wheel sits on. That is your bore. Our hub bore reference covers the method and the failure modes.
- Photograph the hub and keep it. You will be asked.
Two Traps Inside the Data
Even where coverage exists, two things catch people:
Nameplates get reused. “Justy” on these databases covers a 1992 supermini and a 2019 Daihatsu rebadge. “Rocky” covers only the modern crossover. “Proudia” and “Dignity” cover both the 2000 originals and the 2012 Nissan-based revivals. Read the date range, not the model name.
Badge twins are unequally documented. We have found this five times: the Carina ED has a bore where the Corona EXiV does not; the Wingroad has one where the AD Wagon does not; the Corolla II is missing two whole generations the Corsa and Tercel carry; the Gaia has a bore where the Ipsum does not, for the same chassis code; the Domani and Orthia have one where the Integra SJ does not. If your car’s page is blank, read its twin.
If You Have the Data
If you own one of the absent cars and you measure it, we would like the figures. We will publish them with credit and label them as owner-measured rather than factory-sourced — a weaker source than we normally use, and a great deal better than the nothing that currently exists.