Rolex
Datejust 31 278289rbr-0022— lug 16mm

The lug width of the Rolex Datejust 31 reference 278289rbr-0022 is 16mm. It is essential to measure the internal distance between the lugs using a digital calliper at the narrowest point, directly against the case, to ensure a correct fit with no lateral play.

For a white gold case with a diamond-set bezel, the most suitable materials are vegetable-tanned alligator — both belly and hornback — for their natural texture and long-term resilience, or smooth box-calf leather for a more formal aesthetic. Shell cordovan develops an exceptional patina and suits those seeking uniqueness. In all cases, the attachment width must be exactly 16mm.

To replace the strap on the Datejust 31, use a fine-tipped spring bar tool inserted into the internal groove of the lugs to compress the spring bars. Take care not to scratch the white gold case: use a tool with a coated tip or protect the lugs with soft adhesive tape. The operation takes only a few minutes but requires a steady hand and good lighting.

Yes. Any strap with a 16mm attachment and standard spring bars is technically compatible with the Datejust 31. Milano Straps offers a selection of handcrafted straps in various materials — alligator, calf, shell cordovan, rubber — made with a shoulder profile calibrated to Rolex lugs for an optimal aesthetic result, not merely a technical fit.

Longevity depends on the material and frequency of wear. A quality vegetable-tanned alligator strap, with regular but not intensive daily use, maintains its structural and aesthetic integrity for 2–4 years. Shell cordovan, due to its dense and compact fibre, can last over 5 years while developing a distinguished patina. To preserve the strap, avoid prolonged contact with water, excessive perspiration, and direct perfume application. Milano Straps guarantees its straps for 18 months against manufacturing defects.