Rolex
Day-Date 40 228239-0001— lug 20mm
Rolex Day-Date 40 228239-0001: 20mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.
Artisanal Note
"This model requires a precise 20mm lug width to preserve the original sartorial balance."
Technical Specifications
Rolex 228239-0001The essential strap measurement.
Browse 20mm straps →228239-0001
Rolex caliber 3255 Hours, Minutes, Seconds | Date, Day | Chronometer
The Heritage
Compatible Straps
Selected for the 20mm lug width of the Day-Date 40
FAQ
What is the lug width of the Rolex Day-Date 40 228239-0001?
The Rolex Day-Date 40 228239-0001 has a lug width of exactly 20mm. This dimension is critical and must be respected strictly when selecting an aftermarket strap: a 19.5mm or 20.5mm lug width will cause instability and micro-rotation on the wrist.
Which strap material is most suitable for the Day-Date 40 in white gold?
Alligator leather with vegetable tanning is the traditional choice: its neutral tone pairs flawlessly with white gold, developing an elegant patina over time. Shell cordovan and smooth calf are excellent alternatives for those seeking greater versatility. The choice depends on context: alligator for formal occasions, calf for everyday wear.
How do I correctly change the strap on a Rolex Day-Date 40?
Strap change requires a spring bar tool to extract the pins securing the lugs to the case. Position the tool in the small lateral hole on the lug, push gently to compress the internal spring, and slide the pin out. Repeat on the opposite side, then insert the new strap using the reverse procedure. For watches valued above €30,000, we recommend changing the strap at an authorised Rolex service centre.
Is a high-quality aftermarket strap compatible with the Day-Date 228239-0001?
Yes, provided the lug width is precisely 20mm. Leading strap manufacturers (Casati Milano, Molequin, Hirsch, Rubber B) offer aftermarket options with tolerances under ±0.1mm, ensuring fit identical to original Rolex straps. Compatibility is determined by lug geometry, not brand.
How long does a quality leather strap last on a daily-wear watch?
An artisanal alligator or shell cordovan strap, worn daily with reasonable care, maintains structural integrity for 4–6 years. The leather progressively thins from friction; colour evolves through UV exposure and oxidation. Climate (humidity accelerates ageing), wear frequency, and maintenance (cleaning, protective treatments) affect longevity. Changing the strap every 3–5 years on a €40,000 watch is a reasonable investment.
The next step
The right strap isn’t chosen. It is built, together.
From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.
Request an appointment →By appointment only · Milan
The atelier's website: casatimilano.com