Strap for Datejust 31 Yellow Gold Domed / Oyster / MOP Roman

The Rolex Datejust 31 reference 178248-0013 has a lug width of 16mm. This is a non-standard size compared to the most common industrial calibres (18mm and 20mm), so it is necessary to select aftermarket straps specifically produced for this dimension.

For the Datejust 31 178248-0013 in 18-carat yellow gold, alligator straps with vegetable tanning in tobacco brown, cognac or midnight blue offer the finest aesthetic balance. The natural grain of the alligator complements the fluted bezel, while a yellow gold buckle or deployant clasp ensures coherence with the case. Smooth calf leather is the more understated alternative for everyday wear.

Changing the strap on the Datejust 31 178248-0013 requires a forked spring bar tool with fine tips suited to 16mm lugs. Compress the spring bar by acting on the recess cut into the lug, remove the original strap, and fit the new strap with the spring bar tensioned into both recesses. To avoid scratching the 18-carat yellow gold case, protect the lugs with non-residue tape and work on a soft surface.

Yes, there are aftermarket straps compatible with the Rolex Datejust 31 178248-0013 with a 16mm attachment. Milano Straps produces and selects handcrafted straps in this size — alligator, calf leather, shell cordovan, rubber and NATO — made to measure at the Casati Milano atelier or available ready to purchase in the dedicated 16mm strap collection online.

The lifespan of a leather strap on a Rolex Datejust 31 depends on the material and care. A quality vegetable-tanned alligator strap, kept away from prolonged water exposure and periodically treated with nourishing cream, has an average lifespan of 2–4 years with daily wear. Shell cordovan, owing to its compact fibrous structure, tends to last longer while developing a characteristic patina. Using a spare keeper and alternating between two straps will significantly extend the life of both.