Rolex
Datejust 31 278344rbr-0011— lug 16mm

The lug width of the Rolex Datejust 31 reference 278344rbr-0011 is 16mm. This is a specific dimension of the 31mm case variant, distinct from the Datejust 36 and 41 models which feature 20mm lugs. When replacing the strap, it is essential to select a model with a 16mm attachment.

For the Datejust 31 in white Rolesor with a diamond-set bezel, an alligator strap in vegetable-tanned leather is the most coherent aesthetic choice: the belly grain complements the precious finishing without overpowering it. Alternatively, smooth calf leather with a polished steel deployant clasp offers everyday versatility. Shell cordovan is the most refined and understated option for those who prefer a quieter elegance.

The strap on the Rolex Datejust 31 is removed using a spring bar tool, which compresses the spring bars housed between the case lugs. The operation requires care to avoid scratching the white gold or steel surfaces. It is advisable to entrust this task to a watchmaker or specialist atelier to preserve the integrity of the case.

Yes, there are artisan aftermarket straps compatible with the Datejust 31, crafted with a 16mm attachment. Milano Straps offers a curated selection of leather, alligator and other materials specifically available in this size. It is essential to verify that the aftermarket strap uses standard 16mm spring bars and that the finishing at the lugs meets the standard befitting the watch.

The lifespan of a leather strap depends on the material and care it receives. A quality vegetable-tanned alligator strap, with regular maintenance (conditioning cream, periodic rotation), can last between 3 and 5 years while retaining structural and aesthetic integrity. Calf leather generally has a shorter lifespan of 2–3 years, while shell cordovan is the most durable option owing to the density of its fibres. Avoiding prolonged exposure to water and perspiration significantly extends the strap's life.