Rolex
GMT-Master 126715CHNR-0002— lug 20mm

The Rolex GMT-Master 126715CHNR-0002 features a lug width of 20 millimetres. This specification is determined by the case geometry and the specific straight lugs of this model. To verify the width correctly, position a digital calliper between the watch pins (not on the pins themselves), perpendicular to the dial. The measurement should fall between 19.8 and 20.2 millimetres.

The original Rolex strap is crafted from alligator leather with pronounced directional grain, offering exceptional moisture resistance and highly desirable aesthetic ageing. However, calf leather subject to vegetable tanning represents an alternative of comparable quality, with a softer hand and visible patina development over time. Shell cordovan provides superior density and an almost ceramic tactile quality. Your choice should depend on usage: professional environments benefit from alligator, sporting activities prefer NATO fabric, and marine environments suggest FKM rubber.

Changing the strap requires a specialized spring bar tool for pin extraction. Position the watch on a soft, flat surface. Locate the small holes beneath the lugs and insert the spring bar tool into one hole, gently lifting the pin until it detaches. Repeat on the opposite side. Insert the new strap by aligning its holes with the pins and press firmly until you hear the locking click. If you lack experience, consulting a qualified watchmaker is advisable.

Yes, provided the strap respects the 20 millimetre lug width and possesses adequate construction quality. Artisanal straps from certified manufacturers (such as Casati Milano) guarantee resistance, finishing and longevity equivalent to original Rolex straps. The advantage of an aftermarket strap is the ability to personalise the material (alligator, calf, cordovan), colour and workmanship according to your aesthetic preferences and intended use.

The lifespan of a leather strap depends on material type, usage intensity and maintenance practices. High-quality alligator, with moderate wear and regular maintenance (dusting, protection from excessive moisture, annual conditioning), lasts 5–8 years. Vegetable-tanned calf leather has similar longevity but visible ageing characteristics. Shell cordovan, owing to its superior density, can exceed 10+ years of service. FKM rubber experiences faster wear (2–4 years) but offers superior chemical resistance. Rolex recommends inspection or replacement every 3–4 years of daily wear.