Strap for Chronomat B01 42 Stainless Steel / Bentley / Rouleaux

The lug width of the Breitling Chronomat B01 42 AB01343A1L1A1 is 22mm. This measurement is taken with a digital calliper at the inner gap between the lugs, at the point where they meet the case. Any aftermarket strap in 22mm will be compatible with this reference.

The most suitable straps for the Chronomat B01 42 are vegetable-tanned alligator for formal occasions, box calf or nubuck leather for daily wear, vulcanised rubber for sporting use, and NATO nylon for casual aviation-inspired combinations. The correct size is 22mm with a 20mm buckle.

The strap is changed by removing the spring bars that secure it to the case lugs. A dedicated spring bar tool or fork-tip screwdriver is required. Work on a soft surface to avoid scratching the case, and ensure the replacement spring bars have a diameter compatible with the lug holes.

Yes, the aftermarket offers a wide selection of 22mm straps compatible with the Breitling Chronomat B01 42. Milano Straps produces handcrafted options in leather, rubber and NATO specifically for this lug width, with finishes chosen to complement the instrument aesthetic of the model.

The lifespan of a leather strap depends on hide quality, tanning method and daily use. A handcrafted alligator or vegetable-tanned calf strap, with basic care — avoiding prolonged contact with water and perspiration and rotating between straps — can last between two and five years while retaining its structure and appearance. Milano Straps products carry an 18-month guarantee against manufacturing defects.