Strap for Motorsport Automatic Chronograph Red Bezel / Black / Bracelet

The lug width of the Formex Motorsport 3100.1.8140.100 is 25 millimetres. This measurement is certified and compatible exclusively with straps dimensioned to 25mm. Measurement must be executed internally between the two lugs of the case, at the exact point of strap attachment, using a digital calliper for precision.

For the Motorsport 3100.1.8140.100, the ideal strap depends on intended use. For constructive elegance and patina development: alligator with vegetable tanning in dark brown. For versatility and millimetre-precision adjustment with deployante: vegetable-tanned calf in black or burgundy. For humid environments and aquatic use: FKM rubber in black. For minimalist racing aesthetic: NATO in cotton or polyester. Each choice imparts complementary character to the case.

The strap is removed via the case lugs. Use a spring bar remover or equivalent tool to push the internal elastic pin and extract the worn strap. Insert the new 25mm strap by sliding one end first, positioning the pin, then aligning the opposite end and sliding it until the securing click. Verify both lugs are perfectly seated.

Yes, any strap with rigorously certified 25mm lug width is compatible with the Formex Motorsport 3100.1.8140.100. Artisanal straps from milanostraps.it offer superior build quality, exceptional leather (alligator, shell cordovan, calf), and chromatic customisation. Aftermarket straps guarantee equivalent mechanical security to the original strap, provided the dimension is certified.

A quality leather strap, worn daily on a 46.50mm model like the Motorsport, has an average lifespan of 3–5 years. Factors extending longevity: vegetable tanning (more durable), periodic maintenance with dedicated balm, usage variation (alternating with rubber in summer). Leather develops natural patina over time, increasing character. Wear marks are desirable on a racing watch, not defects.