Rolex
Datejust 31 178274-0078— lug 16mm

The Rolex Datejust 31 reference 178274-0078 requires a strap with a 16mm lug width. This dimension is fixed by the geometry of the 31mm case: any aftermarket or replacement strap must conform to this measurement to ensure correct fitting and visual proportionality on the wrist.

For the Datejust 31 178274-0078 in steel and white gold, a 16mm alligator strap — in navy, slate grey or burgundy — complements the fluted bezel and the hybrid case material beautifully. As an alternative, vegetable-tanned calfskin offers a more understated, everyday character. For sport or aquatic contexts, a rubber or NATO strap is the most practical solution without compromising the watch's overall aesthetic.

To replace the strap on the Datejust 31 178274-0078, a spring bar tool — either lever-tip or fork-tip — is required to release the spring bars connecting the strap to the lugs. Care must be taken to avoid scratching the steel and white gold case. It is advisable to have the operation carried out by a qualified watchmaker or a specialist atelier such as Casati Milano.

Yes, the aftermarket offers a wide selection of straps compatible with the Datejust 31 178274-0078, provided they feature a 16mm attachment. Milano Straps offers bespoke handcrafted straps in alligator, shell cordovan, calfskin and rubber, with tapering and dimensions specifically suited to the Rolex 31mm lug geometry. Artisanal build quality is comparable — and often superior — to factory-supplied straps.

The lifespan of a leather strap for the Datejust 31 depends on the material and frequency of use: a quality vegetable-tanned calfskin strap can last between 2 and 4 years with daily wear, while a high-grade alligator strap may reach 5 to 8 years with proper care. Prolonged exposure to water, perspiration and direct heat sources should be avoided. Casati Milano straps carry an 18-month warranty against manufacturing defects.