Rolex Explorer II
Most Rolex Explorer II references take a 20 mm watch strap: 2 of 5.
Rolex Explorer II lug width by case size
5 references measured. Updated 2026-11-10.
| Case | Lug width | References | Watch strap attachment | For example |
|---|---|---|---|---|
| 39 mm | 19 mm | 1 | — | 1655 |
| 40 mm | 20 mm | 2 | — | 16550, 16570 |
| 42 mm | 21 mm · 22 mm on 1 | 2 | — | 216570 |
References that take a different watch strap
- 226570: 22 mm, not the 21 mm of most 42 mm cases
Other Rolex families
Inside each one the lug width often changes: it is the reference that decides.
- Datejust 31 1,212
- Day-Date 36 744
- Datejust 36 649
- Lady-Datejust 463
- Daytona 240
- Day-Date 40 161
- Datejust 41 126
- Sky-Dweller 97
- Submariner 82
- Pearlmaster 62
- Yacht-Master 57
- GMT-Master 54
All Rolex families → · Why the size changes inside a family →