Rolex
Day-Date 36 118135-0078— lug 20mm

The lug width (misura ansa) of the Rolex Day-Date 36 118135-0078 is precisely 20 millimetres. This distance represents the internal space between the two metallic lugs of the case, measured perpendicularly. Any strap intended for this model must have a width of 20mm to fit correctly without unsightly gaps or mechanical strain. Correct measurement is performed with a digital calliper, measuring the distance between the inner walls of the lugs, not their external width.

For the Day-Date 36 118135-0078 in rose gold, alligator represents the classical choice par excellence: the natural pattern of scales harmonises beautifully with the case geometry. High-quality alligator develops a patina that refines over years, maintaining exceptional wear resistance. Alternatively, Italian calf leather with vegetable tanning offers a homogeneous surface that emphasises the delicacy of the 36mm proportion, ageing magnificently. Shell cordovan, for those seeking indestructibility, develops a characteristic bordeaux patina. Each choice depends on intended daily use and personal aesthetic preference.

Replacing the strap on the 118135-0078 requires a specific tool: the spring bar tool (staccaspringhe). This tool allows compression of the small metallic cylinders (spring bars) that anchor the strap to the case lugs. Carefully position the spring bar tool beneath the spring bar, compress it, and remove the old strap. Insert the new strap by aligning the holes with the spring bars, release the pressure and verify that the strap is securely anchored. The operation requires 2-3 minutes per side. If you lack expertise, it is advisable to consult a certified watch repair professional.

Yes, it is possible to fit high-quality aftermarket straps on the 118135-0078, provided they strictly respect the 20-millimetre lug width specification. Specialist brands such as Casati Milano manufacture artisanal straps specifically dimensioned for this model, using noble materials such as alligator, calf, shell cordovan and technical fabrics. A high-quality aftermarket strap does not damage the watch and permits seasonal rotation of straps, protecting the original strap from accelerated wear. It is essential to verify that the strap possesses appropriate thickness and rigidity to properly support the weight of the rose gold case.

A high-quality natural leather strap, crafted from full-grain leather and vegetable-tanned, typically lasts 3-5 years with moderate daily use. This duration varies significantly depending on material: alligator and shell cordovan, due to their structural density and thickness, may last 5-7 years or longer. Italian calf leather tends towards 4-5 years. Factors such as moisture exposure, perspiration, use in outdoor environments and cleaning frequency directly influence longevity. Protection with natural waxes and periodic rotation with other straps significantly extends durability. Casati Milano straps include an 18-month warranty against manufacturing defects, independent of natural wear.