Rolex
GMT-Master 126718GRNR-0002— lug 20mm

The Rolex GMT-Master 126718GRNR-0002 features a lug width of 20mm. This measurement is essential for selecting compatible aftermarket straps: it represents the distance between the lugs (the small bars that hold the strap to the watch case). Do not confuse lug width with case diameter (40mm)—they are independent measurements. Always verify this specification before purchasing a replacement strap.

The 126718GRNR-0002, with its yellow gold and stainless steel finish, pairs exceptionally well with alligator leather in cognac, dark brown, or black tones—particularly vegetable-tanned hides that develop rich patina over time. Vegetable-tanned calf leather in beige or tan offers an elegant, more economical alternative. For travel and sport use, we recommend nylon NATO straps in grey or sage green, or black FKM rubber that resists moisture and saltwater. Your choice depends on intended use: frequent travel, sporting activities, or formal occasions.

Modern Rolex GMT-Master models feature fixed lugs, so strap replacement occurs via the spring bars. Follow these steps: 1) Use a spring bar tool to depress and remove the spring bar holding the strap (insert the tool into the small lateral opening); 2) Remove the old strap; 3) Thread the new 20mm-width strap through both lateral passanteria; 4) Reinforce the spring bar until secure. If you are uncertain, contact an authorised Rolex watchmaker—precision is paramount.

Absolutely. High-quality aftermarket straps—hand-crafted alligator, vegetable-tanned calf, technical NATO—are fully compatible with any 20mm Rolex. Many collectors regularly replace original Rolex straps with bespoke pieces from specialised artisans, offering aesthetic flexibility and practical versatility. The key criterion: ensure your aftermarket strap matches the construction quality and standards of your timepiece. A Rolex deserves a strap of commensurate calibre.

Longevity varies by material and wear patterns. Vegetable-tanned alligator typically lasts 4–6 years with daily wear, then develops character patina before requiring restoration or replacement. Vegetable-tanned calf, more sensitive to humidity, endures 3–4 years. Shell cordovan, if kept dry, can last 8–10 years. Technical NATO straps maintain integrity for 5–7 years without significant deterioration. Heat, humidity, and direct UV exposure accelerate aging. Casati Milano recommends regular maintenance: monthly cleaning, conditioning every six months, and protection from unnecessary moisture exposure.