Strap for Chronomat B01 42 NFL Las Vegas Raiders / Rouleaux

The Breitling Chronomat B01 42 AB01342B1B1A1 has a lug width of 22 mm. This measurement is taken between the two lugs using a digital calliper or a thin millimetre ruler, measuring the internal distance between the lug tips. All compatible aftermarket straps must have an attachment width of 22 mm.

For the Chronomat B01 42, the most suitable straps are vegetable-tanned calfskin with a perforated racing finish — in keeping with the watch's aeronautical DNA — or smooth alligator leather for formal settings. Vulcanised rubber is the preferred choice for intensive sports use, whilst ballistic nylon NATO straps recall the model's military aesthetic. A brushed steel deployant clasp ensures both security and visual continuity with the case.

To replace the strap on the Chronomat B01 42, a dedicated springbar tool is required — a double-ended instrument that compresses and releases the spring bars housed in the 22 mm lugs. The operation should be performed with the watch face-down on a protected surface. Remove the lateral spring bar first, then slide out the strap. Fitting the new strap is carried out in reverse order. Take care not to scratch the case during the process.

Yes, the aftermarket offers a wide range of straps compatible with the 22 mm lug width of the Chronomat B01 42 AB01342B1B1A1. Milano Straps provides handcrafted options in Italian vegetable-tanned leather, alligator, shell cordovan, rubber and nylon, all made with standard 22 mm spring bars. It is also advisable to check the keeper and buckle width, which for this model is typically 20 mm.

The lifespan of a leather strap on a sports chronograph such as the Chronomat B01 42 depends on use and leather quality. A high-quality vegetable-tanned calfskin strap under moderate daily use will typically last between 18 and 36 months. Prolonged exposure to perspiration, water and UV rays accelerates deterioration. Casati Milano straps carry an 18-month warranty against manufacturing defects.