Rolex
Day-Date 36 118235f-0107— lug 20mm

The lug width of the Rolex Day-Date 36 118235f-0107 is 20mm. This measurement represents the external distance between the two case lugs where the strap connects. It is specific to this model and not interchangeable with adjacent sizes such as 18mm or 22mm without compromising the original design proportions.

For the Day-Date 36 118235f-0107 in rose gold, alligator is the classical choice: the natural grain enhances the warmth of the metal without competing with the sunburst dial finish. Shell Cordovan represents an elegant alternative for formal occasions, offering a near-mirror lustre. Vegetable-tanned calf leather provides consciously artisanal texture and develops personal patina over time.

Strap replacement requires removal of the spring bars from the case lugs using a dedicated extraction tool. The aftermarket strap must have spring bar tubes (passants) of thickness consistent with the original—too thin causes rotation, too thick creates friction. We recommend entrusting this operation to someone who understands precise tolerances, or commissioning a bespoke strap from Casati Milano.

Yes, provided it respects the 20mm lug width and passant thickness tolerances. Technical compatibility does not automatically guarantee aesthetic harmony: a quality aftermarket strap must enhance the rose gold case whilst maintaining visual balance with the sunburst finish. Casati Milano produces artisanal straps specifically designed for the Day-Date 36, available with an 18-month warranty against manufacturing defects.

Longevity depends on material and wear patterns. Traditionally treated alligator lasts approximately 4–6 years under daily use; Shell Cordovan 5–7 years due to greater density; vegetable-tanned calf 3–5 years whilst developing visible patina. Sun exposure, perspiration and humidity accelerate ageing. A bespoke strap from Casati Milano is renewable: leather can be cleaned, conditioned and restored, significantly extending functional lifespan.