Strap for Motorsport Automatic Chronograph PVD / Red Bezel / Black / Bracelet

The lug width of the Formex Motorsport 3100.4.8122.110 is 25mm, a specific construction feature that deviates from standard market dimensions. This measurement is taken as the exact distance between the inner shoulders of the watch lugs. The generous 25mm width accommodates the robust mounting of the ETA 7750 calibre and the stable fixing of the chronograph spring, requiring precise selection of a compatible strap.

For the Motorsport 3100.4.8122.110, we recommend three principal categories: natural alligator (brown or black) for aesthetic coherence with the titanium case's brutalism; vegetable-tanned calf for those seeking natural patina development and ageing characteristics; nitrile rubber or FKM for those wishing to emphasize the racing DNA and professional functionality. Each material choice represents a specific aesthetic response to the watch's design philosophy.

Strap replacement is performed using a spring bar removal tool to gently extract the passing pins from the case lugs. Position the tool into the slot on the lug shoulder, applying moderate downward pressure to release the spring. Repeat the operation on both lugs, then insert the new pins into the replacement strap and secure it by engaging the strap with the lugs. The operation requires careful attention to avoid scratching the titanium and steel case surfaces.

Yes, any artisanal strap with 25mm lug width is compatible. However, because 25mm represents a specific width, not all generic market straps are suitable: verification that the manufacturer explicitly confirms compatibility with this measurement is essential. Artisanal straps in alligator, calf and rubber available for 25mm ensure proper accommodation without gaps or forced fitting.

Lifespan depends on material and usage patterns. A natural alligator strap with vegetable tanning maintains structural integrity for 4-6 years with daily wear, developing a patina that testifies to ageing. Vegetable-tanned calf exhibits similar lifespan, with variability related to humid climates and sun exposure. Nitrile rubber provides superior durability (7-10 years) due to the absence of biological degradation. Periodic regeneration of the lug passages (on the spring bar seats) significantly extends the useful life of any leather strap.