Rolex
Day-Date 36 118135-0074— lug 20mm

The Rolex Day-Date 36 reference 118135-0074 features a lug width of 20mm. This measurement is essential when selecting any aftermarket or replacement strap. The lugs also present a downward curved profile — often referred to as a bombé lug — which requires straps with pre-shaped or curved ends to ensure proper fitment without mechanical stress on the case.

For a rose gold Day-Date 36, alligator straps with a symmetrical belly texture — in shades such as burgundy, tobacco or bottle green — provide the most coherent pairing in terms of material quality and colour harmony. Vegetable-tanned calfskin develops a natural patina over time, while shell cordovan offers exceptional compactness and a natural lustre requiring no surface treatment. A rose gold deployant clasp is the recommended closure to maintain chromatic consistency.

Replacing the strap on a Day-Date 36 requires a precision springbar tool or lug lever to remove the spring bars from the lugs. Given the specific curvature of this model's lugs, it is advisable to have the operation carried out by a watchmaker or specialist atelier to avoid scratching the rose gold case. The replacement strap must feature ends compatible with the bombé lug profile at 20mm.

Yes, there are aftermarket straps compatible with the Day-Date 36's 20mm lug width. It is essential to choose manufacturers that respect the curved lug geometry with pre-shaped strap ends. Milanostraps.it offers a curated selection of handcrafted 20mm straps, compatible in width and profile with this reference, available in various materials and finishes.

The lifespan of a leather strap depends on the material, maintenance and frequency of use. A high-quality alligator strap, rotated with other straps and kept away from excessive perspiration and water, can last between 3 and 5 years whilst retaining its structure and appearance. Vegetable-tanned calfskin offers similar durability whilst developing a distinctive patina. Shell cordovan, thanks to its dense fibre structure, is among the most long-lasting. Casati Milano straps include an 18-month guarantee against manufacturing defects.