Rolex
Explorer II 216570-0002— lug 21mm

The lug width of the Rolex Explorer II 216570-0002 is precisely 21mm. This measurement is critical for strap compatibility: a strap with a smaller or larger lug width will not fit correctly and risks damaging the case. Always verify the lug width with callipers before purchasing an aftermarket strap.

There is no single "best" strap—it depends on your use case. For formal and travel contexts, we recommend alligator in black or vegetable-tanned brown, which develop a noble patina over time. For instrumental and outdoor use, a NATO strap in grey or black nylon fabric offers practicality and durability. A dark grey rubber strap is ideal for humid climates. Your choice should reflect your primary use.

Remove the watch from your wrist. Locate the spring bar (the small pin connecting the strap to the case lugs): it has internal spring tension. Using a dedicated spring bar tool or small flathead screwdriver, gently press the pin inward and slide the old strap out of the lugs. Insert the new strap, aligning the hole with the spring bar, release the tension and the bar will click into place. Ensure the strap is secure on both sides before wearing the watch.

Yes, provided the strap has a 21mm lug width and is constructed with quality materials (pigmented leather, medical-grade rubber, or dense textile). Aftermarket straps do not affect the watch's value if removable: retain the original Rolex strap. We recommend specialist manufacturers that guarantee precision lug width and construction quality, such as Casati Milano.

The lifespan of a leather strap depends on intensity of use and maintenance. A quality alligator or calf strap, worn daily and kept dry, lasts 3–5 years. If exposed to frequent moisture, perspiration, or direct UV rays, durability reduces to 1–2 years. NATO and rubber straps last longer (5–10 years) due to material resilience. With regular care (gentle cleaning, drying) and rotation with other straps, you can extend strap life significantly.