Hublot
Big Bang 441.JP.4890.RT— lug 21mm

The lug width of the Hublot Big Bang 441.JP.4890.RT is 21mm. This is the internal distance between the two lugs of the case, measurable with a digital caliper at the narrowest point. It is a proprietary Hublot specification: for proper fit, it is essential to use straps made exactly to this lug width.

The choice depends on intended use. For formal or collection wear, Louisiana alligator with wide grain in black or midnight blue enhances the three-dimensional character of the case. For daily use, calf box-grain offers durability and develops patina over time. For sports use, a vulcanized rubber strap references original Hublot materials while ensuring complete water resistance.

The Big Bang uses a proprietary Hublot attachment system with visible screws on the lugs. Replacement requires a precision flathead screwdriver of the correct size to unscrew the attachment pins. It is recommended to perform this operation on a soft surface to protect the case, and if you are not comfortable with the tool, consult a watchmaker or the Casati Milano atelier.

Yes. There are aftermarket straps made specifically for the Hublot Big Bang attachment system with 21mm lugs. Milano Straps offers a selection of handcrafted compatible straps, made by hand in Italy with selected leathers, that replicate the original attachment geometry ensuring a precise fit without case modifications.

Durability depends on leather quality, daily care, and exposure to perspiration and humidity. A high-quality artisanal alligator or calf strap, kept away from water and heat sources and periodically treated with nourishing wax, maintains structural and aesthetic integrity for 3-5 years with regular use. Milano Straps straps are covered by an 18-month warranty against manufacturing defects.