Strap for BC4 Chronograph DLC / Black

The lug width of the Oris BC4 01 674 7633 4764-07 5 24 58BFC is 24 millimetres. This measurement corresponds to the distance between the case's attachment pins. It is a less common standard than 20 or 22mm, which means the aftermarket strap selection is more selective but still extensive among specialist manufacturers. Always verify strap compatibility by measuring the internal distance between the pins: it must be exactly 24mm to ensure a perfect fit without lateral play.

The 45mm BC4 is versatile and accommodates multiple configurations. An alligator or calf leather strap with vegetable tanning represents the most elegant solution, conferring sophistication to the sporty dial. A 3-pass NATO strap in fabric is ideal for those preferring a more functional and casual profile. For intensive or aquatic use, an FKM rubber strap guarantees reliable grip and minimal maintenance. The choice depends on usage context and personal aesthetic preference.

Strap replacement is a straightforward operation requiring no particular technical expertise. Obtain a dedicated tool (spring bar tool) to remove the attachment pins from the case. Position the tool in the pin groove, apply light pressure to move the pin away, and slide out the old strap. Repeat on the other side. To install the new strap, align the holes with the pins, use the spring bar tool to compress the pin, and insert it into the case groove until you hear a click. Verify that the pin is securely locked before wearing the watch.

Yes, numerous manufacturers offer 24mm aftermarket straps compatible with the BC4. Milano Straps stocks a dedicated collection of high-quality leather straps (alligator, calf, shell cordovan), technical fabrics (NATO, canvas), and rubber, all manufactured with 24mm attachment pins. These straps maintain the geometric and constructive specifications necessary for secure and durable fit, allowing you to personalise your watch's aesthetic without compromising functionality.

A high-quality artisanal leather strap with vegetable tanning, used moderately (5–7 days per week) and subjected to regular maintenance, has an average lifespan of 3–5 years before replacement is necessary. Longevity depends on variables such as direct sun exposure, humidity, usage frequency, and care. Conditioning the leather every 6–12 months with specialist products (beeswax, natural oils) significantly extends lifespan. An FKM rubber strap offers longer durability (5–7 years) but less aesthetic versatility. In both cases, replacement cost is modest relative to the watch's overall value.