Strap for Big Pilot Constant-Force Tourbillon AMG One Owners

The lug width of the IWC Big Pilot IW5905-02 is precisely 22 millimetres. This measurement represents the distance between the inner shoulders of the lugs, where the strap attaches to the case. You can verify this by measuring between the two spring bar pins using a digital calliper. Compatible straps must have a width of 22 millimetres to fit correctly on the case without play or installation difficulty.

The ideal strap for the Big Pilot IW5905-02 depends on usage context and personal preference. For formal elegance, we recommend pearl grey or dark brown alligator with brushed finish: the natural grain pairs perfectly with the titanium case. For daily and dynamic use, vegetable-tanned calf leather offers comfort and develops a natural patina over time. If you intend to wear the watch in aquatic or extreme environments, a high-density rubber strap guarantees maximum durability. For maximum versatility, a fabric NATO strap allows quick circumference adjustments and can be worn over jackets.

Changing the strap on the Big Pilot IW5905-02 requires a spring bar tool. Place the watch on a soft surface to prevent scratches. Insert the flat tip of the spring bar tool under the spring bar from the upper lug side, pushing downward to release the pin from its seat. Once freed, remove the pin using tweezers or by hand. Repeat for the lower lug, then remove the old strap. To install the new strap, align the holes at both ends and push the spring bars into position until the strap is firmly secured. Verify that the pins are completely seated.

Yes, provided the aftermarket strap has exactly 22 millimetres lug width and is made with materials of quality comparable to the original. Many artisanal straps are produced with certified leathers and refined stitching that equal or exceed straps made by official manufacturers. Installation safety depends on construction details: holes must be precise, the internal keeper well-calibrated to prevent slippage, and stitching robust. We recommend straps from specialised ateliers that guarantee tight tolerances and documented materials. A quality aftermarket strap also offers greater versatility in colour, texture, and customisation possibilities.

Leather strap longevity depends on frequency of use, exposure to moisture, and materials employed. A traditionally tanned alligator strap normally lasts between 3 and 5 years of daily wear, developing an increasingly fascinating patina. Vegetable-tanned calf typically lasts 2-3 years with regular use, though the subtle grain tends to wear visibly in flex zones. Durability increases significantly if you rotate straps (alternating with others), limiting constant exposure to perspiration and temperature fluctuations. A strap with double stitching and tight points resists better than single-stitched variants. Signs of irreversible wear include cracks in the leather, stitching separation at the edges, and loss of structural rigidity around the spring bar tunnels.