Rolex
Datejust 31 278384rbr-0030— lug 16mm

The lug width (or strap width) of the Rolex Datejust 31 ref. 278384rbr-0030 is 16 millimetres. This dimension represents the internal distance between the two lugs of the case, measured wall-to-wall. Respecting this measurement is critical to ensure proper fit between the strap's keeper and the lug shoulders, avoiding lateral play or undesirable compression on the wrist.

For the bicolour Datejust 31 in steel and white gold, we recommend alligator leather with vegetable tanning in brown tones (dark brown, cognac, honey), which complements the white gold and harmonizes with the case's geometric lines. Black or charcoal grey calf leather offers a sober and versatile alternative. For those seeking patina and durability, shell cordovan is ideal due to its natural hardness and lustre that evolves over time.

Changing the strap requires a spring bar tool and a soft work surface to prevent scratches. Insert the tool into the groove beneath the suspension pin, compress the internal spring slightly, and extract the lug from the case. Repeat on the other lug. Position the new strap by aligning its keepers with the case lugs and press until the spring bars snap into place. We recommend entrusting this operation to a qualified professional to preserve the case's integrity.

Yes, provided the aftermarket strap is dimensioned for a 16-millimetre lug width and manufactured with precise tolerances. An artisanal strap crafted by selected master leatherworkers offers superior quality compared to standard industrial straps, guaranteeing perfect fit and longer durability. Always verify that the keeper measures 16mm in width and that its thickness is compatible with the case geometry.

The lifespan of a leather strap depends on leather quality, frequency of use, and maintenance. An artisanal strap made from alligator or shell cordovan typically lasts 3–5 years with moderate daily use. Calf leather is more delicate and generally lasts 2–4 years. Vegetable tanning favours natural ageing and the development of a rich patina. To extend durability, avoid prolonged water exposure, protect from direct sunlight, and periodically apply a protective balm formulated for noble leathers.