The Short Version
- The classic RT-series Corona and MX-series Mark II are in no wheel database we could find. Not one of four.
- The 5×100 figure in circulation could not be traced to any source. Treat it as unverified, not as fact.
- Where the data does start, the two nameplates disagree: the 1989 Corona T170 is 5×100 and the 1989 Mark II X80 is 5×114.3.
- That disagreement is the reason not to extrapolate backwards.
Where the Coverage Actually Begins
We went looking for factory data on the 1960s and 1970s Corona and Corona Mark II, and here is exactly what we found:
| Source | Oldest Corona or Mark II coverage |
|---|---|
| RS Watanabe matching data | Mark II family starts at GX70 / GX71, around 1980–84, at 4×114.3. No RT or MX row exists anywhere. |
| Japanese factory database A | Corona starts 1989 (T170). Mark II starts 1989 (X80). |
| Japanese factory database B | Same — Corona from 1989, identical grade list. |
| International aggregator | Oldest Corona generation listed is the T160 / T150, 1983–87. |
So there is a hard floor at roughly 1980 for RS Watanabe and 1989 for the factory databases. Everything before that is simply not tabulated anywhere we can reach.
The Two Numbers Where Data Does Exist
This is the useful part, and it is a warning against extrapolation.
| Car | Chassis | Period | Grade | Wheel | Tyre | PCD / Holes / Bore |
|---|---|---|---|---|---|---|
| Corona | E-AT170 | 1987–1992 | 2WD 1.5 DX | 13×5J +39 | 165SR13 | 100 / 5 / under investigation |
| Mark II | E-SX80 | 1988–1992 | Sedan 1.8 STD | 14×5J +50 | 175SR14 | 114.3 / 5 / under investigation |
Same era, same manufacturer, two nameplates that share a lineage, and two different bolt circles. The Corona is 5×100 and the Mark II is 5×114.3.
That is exactly why we will not carry either figure back to the 1960s cars. If two directly related models diverge in 1989, there is no basis for assuming what a 1968 Corona Mark II did.
Where the Family Splits
Worth knowing for searching. The Corona Mark II arrived in September 1968 as a longer, more comfortable car positioned between the Corona and the Crown. From the second generation in 1972 it dropped “Corona” from the name and became simply the Mark II, going on to spawn the Chaser and the Cresta.
So “Corona Mark II” is a real name for a real car, and it belongs to a narrow window. After 1972 the two lines are separate, and by 1989 — as the table above shows — they no longer share a bolt pattern.
What to Do If You Own One
Measure everything. Count the studs, measure across the bolt circle, measure the hub register, and check the thread on a nut.
RS Watanabe’s own site carries a warning that applies squarely here: on old cars, parts get transplanted over the decades, so pay particular attention to hub bore, PCD and nut pitch. On a fifty-year-old Corona the car in front of you may not match any table even if a table existed.
Send us what you measure and we will publish it with credit. This guide exists partly as an admission that the data is missing.
Importing
Every RT and MX-series Corona and Mark II is decades past the US 25-year mark. Toyota sold the Corona in the United States through this era, so parts knowledge exists there even where wheel data does not.
What We Could Not Verify
- Bolt pattern, hole count, hub bore, wheel size and offset for every RT-series Corona and for the RT60, RT70 and MX30 Mark II. Confirmed absent from all four sources.
- The 5×100 claim for the classic cars. We could not trace it to anything.
- Hub bore for the T170 Corona and X80 Mark II, both marked “under investigation”.