Armin Strom · Gravity

Strap for Gravity Air

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter43 mm
ReferenceTI13-GA.50
FamilyGravity
MovementArmin Strom caliber AMR13 hours, minutes, small seconds
Year2013
CaseTitanium

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the Gravity TI13-GA.50

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Gravity TI13-GA.50, seen from the bench

The Armin Strom Gravity reference TI13-GA.50 is equipped with the in-house caliber AMR13 with hour, minute and small second indication. The movement features a unique architecture with off-centered oscillating masses visible on the dial. The construction follows the canons of the Swiss manufacturer Armin Strom, specialized in mechanical watches with complications.

Frequently asked questions

What is the lug width of the Armin Strom Gravity TI13-GA.50?

The lug width of the Armin Strom Gravity TI13-GA.50 is 20mm. This dimension is measured between the two lugs that connect the strap to the case and is a widely available standard among quality artisanal straps.

What is the best strap for the Armin Strom Gravity TI13-GA.50?

The ideal strap depends on usage: for formal contexts, an alligator or vegetable-tanned calf leather enhances the elegance of the instrument; for daily and sports use, a NATO strap in canvas or FKM rubber offers practicality and durability. The titanium case pairs well with both natural leathers and technical materials.

How do I change the strap on my Armin Strom Gravity TI13-GA.50?

To change the strap, you need to remove the spring bars connecting the current strap to the case. Using a dedicated tool (spring bar tool), gently press the small pin to release the strap. Insert the new 20mm strap by aligning the spring bars and allow them to snap into place. We recommend having this operation performed by a professional watchmaker if you are unsure.

Can I use a compatible aftermarket strap on my Armin Strom Gravity TI13-GA.50?

Absolutely yes. A quality aftermarket strap with a 20mm lug width is perfectly compatible and allows you to personalize your watch according to your aesthetic taste and usage needs. Artisanal straps from Milano Straps, for example, are designed to guarantee dimensional precision and construction quality.

How long does a leather strap last on a watch like the TI13-GA.50?

The longevity of a leather strap depends on usage, material, and maintenance. A quality alligator or vegetable-tanned calf leather strap typically lasts 3-5 years with daily wear, ageing elegantly and developing a rich patina. Periodic maintenance (gentle cleaning and conditioning) significantly extends the strap's lifespan.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

Request an appointment →

Casati Milano · Via XX Settembre 15, Milan · by appointment only