Strap for Tank Française Grande (LM) W51005Q4

The lug width of the Cartier Tank Française W51005Q4 is 20 mm. This measurement represents the internal distance between the two lugs of the case, where the strap is inserted. To verify this measurement correctly, remove the original strap and measure the internal distance between the lugs at their narrowest point. This dimension ensures guaranteed compatibility with quality certified aftermarket straps.

For the W51005Q4, the most suitable strap is dark brown or black alligator, a material that enhances the elegance of the bicomponent case in yellow gold and steel. Alligator offers a regular texture that naturally complements the austere geometry of the case. Valid alternatives include vegetable-tanned calf leather for those preferring a more natural appearance and evolving patina over time, or shell cordovan for superior density and durability. The choice depends on usage context and personal colour preferences.

Changing the strap on the W51005Q4 is a straightforward operation requiring a specific tool: the spring bar tool. With the watch positioned on a soft cloth, place the tip of the tool under the elastic pin (spring bar) connecting the strap to the lug, applying gentle upward pressure. The pin will retract, allowing you to remove the strap. Repeat the operation on the other side, then insert the new strap by aligning the holes with the elastic pins. Verify the strap is secure before wearing the watch.

Yes, the W51005Q4 is fully compatible with 20 mm aftermarket straps, provided they meet construction and quality standards. Aftermarket straps allow complete personalisation in terms of material, colour, stitching type and buckle, without compromising mechanical compatibility. It is advisable to choose straps made by specialised craftsmen using certified leathers and robust construction, ensuring durability and comfort equivalent to original Cartier straps.

The lifespan of a leather strap on the W51005Q4 depends on the type of leather, frequency of use and environmental conditions. Quality certified alligator or shell cordovan can last 4-7 years of daily use, developing a natural patina over time that increases its appeal. Chrome-tanned calf leather has similar durability but less aesthetic evolution, whilst vegetable-tanned calf offers slightly shorter durability but a more distinctive patina. Prolonged exposure to humidity, intense heat and direct sunlight accelerates the natural ageing of the leather.