Strap for GMT-Master II Yellow Gold / GRNR / Jubilee

The lug width of the Rolex GMT-Master 126718GRNR-0001 is precisely 20mm. This measurement refers to the internal distance between the two lugs at the case, where the spring bars of the strap are inserted. To verify compatibility with an aftermarket strap, measure this distance at the case attachment point, excluding the crown and crystal, focusing solely on the lug geometry where the spring bars are seated.

For a yellow gold and stainless steel two-tone case, alligator leather with vegetable tanning represents the most sophisticated choice: the natural grain pattern dialogues with the ceramic bezel without competing for visual dominance, allowing the yellow gold to maintain its prominent role. Alternatively, calf leather with a Rolex-compatible deployante clasp offers water-resistant properties, whilst a technical NATO strap in black or blue transforms the instrument into a more operational timepiece. For aquatic environments, consider natural rubber or treated calf leather with hydrophobic coatings.

Extract the spring bars (small springloaded pins) securing the strap to the lugs using the dedicated spring bar removal tool. Once both pins are extracted, the previous strap releases easily. Align the new 20mm strap with the lugs and reinsert both spring bars into their slots, pressing firmly until you hear and feel an audible click indicating secure seating. Verify proper attachment by gently pulling the strap to confirm it is fully locked.

Yes, aftermarket straps compatible with the 20mm lug width are entirely compatible with the GMT-Master 126718GRNR-0001 without compromising official Rolex warranty coverage, as strap replacement falls within routine maintenance. However, purchase from specialised artisans who guarantee construction quality and verified compatibility with Rolex spring bars. An inferior-quality strap can damage the lugs over extended use.

A quality leather strap (alligator, calf, shell cordovan) with vegetable tanning typically lasts 3-5 years of daily wear, developing a patina that reflects the history of your wrist. Longevity depends on ambient humidity, cleaning frequency and stress applied during normal wear. NATO or natural rubber straps resist longer (5-7 years) as they are less susceptible to moisture damage. Casati Milano provides 18 months warranty on manufacturing defects, with reconditioning services available upon request.