Rolex
Datejust 31 178248-0091— lug 16mm

The Rolex Datejust 31 178248-0091 features a lug width of 16mm. This measurement represents the internal width of the lug, calculated from wall to wall without including the external passant. It is a specification specific to the 31mm case and represents the exact width required for any compatible replacement strap.

For a Datejust 31 178248-0091 in 18-karat yellow gold, alligator in medium brown tonality represents the classical choice: the regular grain enhances the light reflected by the golden case. However, vegetable-tanned calf leather in dark burgundy or deep black shell cordovan offer equally refined contemporary alternatives, depending on wearing context.

Strap replacement requires removal of the spring bar on both sides of the case. Use a dedicated spring bar tool to compress the spring, then gently extract the lug from the lug end. Insert the new strap and reinsert the spring bar carefully. Avoid using screwdrivers or improvised tools to prevent damage to the case finish. In case of doubt, consult an authorised service centre.

Yes, 16mm aftermarket straps are fully compatible with the Datejust 31 178248-0091. The lug width is a standard measurement, so any quality manufacturer offering 16mm straps will guarantee optimal fit. Simply verify that the strap features appropriate spring bars compatible with the original Rolex lugs.

A quality leather strap (alligator, vegetable-tanned calf, shell cordovan) mounted on a daily-wear Datejust 31 typically reaches 5–7 years of useful life before requiring replacement. Longevity depends on wearing frequency, environmental conditions (sunlight exposure, humidity), and maintenance. Vegetable-tanned leathers develop natural patina enhancing aesthetics over time; aniline leathers require greater protection.