Strap for Day-Date 40 White Gold - Diamond / Paved

The lug width (also called strap width or anse width) of the Rolex Day-Date 40 model 228349rbr-0036 is 20 millimetres. This dimension is measured perpendicularly between the two lugs of the case and represents the available space for strap accommodation. The 20mm is the standard Rolex specification for this 40mm case version, differing from the 36mm of the previous generation. To verify compatibility before purchasing an aftermarket strap, measure the internal space between the lugs using a digital calliper.

For a Day-Date 40 228349rbr-0036 in white gold, natural alligator is the ideal aesthetic and technical choice. The irregular grain of alligator leather creates magnificent tactile contrast against the cool lustre of 950 white gold, with a patina that develops naturally during the first year of wear. Alternatively, vegetable-tanned calf leather offers understated elegance and noble ageing. For versatile daily use, vulcanised Tropic rubber combines durability and contemporary styling, whilst silicone ensures waterproofing and sophisticated modern aesthetics.

Changing the strap on the Day-Date 40 228349rbr-0036 requires specific tools: a spring bar tool (extracting lever) and a small Allen key for some models. Position the watch on a stable surface with the case facing upwards. Gently insert the extracting tool under the spring bar tube from one side, pushing slightly to compress the internal spring. When the tube retracts sufficiently, remove the old strap. Repeat the procedure on the other side. To install the new strap, align the holes to the lugs and insert the spring bar tube, pressing until you hear the locking click. If you prefer to avoid potential damage, Casati Milano offers complete artisanal service by appointment.

Any strap with a 20-millimetre lug width is theoretically compatible with the Day-Date 40 228349rbr-0036. However, to guarantee aesthetic quality and constructive durability, we recommend selecting straps produced by specialists who understand the precision and finishing requirements demanded by a Rolex in white gold. High-quality straps in alligator, vegetable-tanned calf, Tropic rubber and silicone represent the ideal categories. On milanostraps.it you can consult the complete catalogue of 20mm-compatible straps, or personalise a creation with Casati Milano through sartorial consultation by appointment.

The lifespan of a leather strap for the 228349rbr-0036 depends on leather quality, frequency of use and maintenance. Excellence-grade natural alligator lasts an average of 3–5 years of regular daily use, with a patina that improves during the first year. Vegetable-tanned calf has similar longevity but develops more visible creasing over time. Vulcanised Tropic rubber achieves 4–6 years of reliable service if kept dry. Casati Milano straps include an 18-month warranty against manufacturing defects and can be renewed through reconditioning service. To extend lifespan, avoid prolonged moisture exposure, remove the watch before showers and swimming, and store the strap in a dry environment.