Breitling · Exospace

Strap for B55 Exospace Yachting Titanium / Carbon / Bracelet

Takes 24 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width24 mm
Case diameter46 mm
ReferenceEB5512221B1E1 (aka: EB551222.BG45.181E)
FamilyExospace
MovementBreitling caliber B55 Additional 24 hours Hand (adjustable), hours, minutes, seconds | date, day, month, perpetual calendar, year indicator | Chronograph, countdown, Flyback, Rattrapante | alarm | chronometer, power reserve indicator, connected
Year2018/11
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 Exospace EB5512221B1E1 (aka: EB551222.BG45.181E)

Selected for the 24 mm lug width · workshop selection

All 24 mm straps →

The Exospace EB5512221B1E1 (aka: EB551222.BG45.181E), seen from the bench

The Breitling Exospace B55 Connected EB5512221B1E1 is a titanium chronograph with a 46mm case diameter and 24mm lug width, representing advanced aeronautical instrumentation. It features the Breitling Caliber B55 movement, combining mechanical precision with digital connected functions including perpetual calendar, annual indicator, countdown, and split-seconds chronograph. The Chronometer-certified movement maintains accuracy within -4/+6 seconds per day. Built for extreme environments, the titanium construction provides lightweight robustness for pilots and professionals operating across global time zones.

Frequently asked questions

What is the lug width of the Breitling Exospace EB5512221B1E1?

The lug width of the Breitling Exospace EB5512221B1E1 is 24mm. This measurement is determined by the distance between the two spring bar attachments on the 46mm case and is essential for ensuring both mechanical compatibility and aesthetic coherence. An incorrect size would result in visual misalignment and closure instability.

Which strap is most suitable for the Breitling Exospace B55?

For the titanium chronograph Exospace, we recommend alligator or shell cordovan: the former for elegance and tactile compatibility with brushed case finishes, the latter for robustness and the deep patina that develops over time. For extreme environments, a grey or black NATO strap offers atmospheric resilience without functional compromise.

How do I change the strap on the Breitling Exospace EB5512221B1E1?

The procedure requires a dedicated spring bar extraction tool. Position the watch securely on a protective mat, insert the tool into the spring bar slot and gently lift to release tension, extracting the pin. Repeat on the opposite side, then insert the new strap by aligning the lug holes with the pins and pressing until the closure clicks.

Can I use an aftermarket strap on this model?

Yes, it is possible to fit a 24mm aftermarket strap on the EB5512221B1E1, provided it respects the exact lug width specification. We advise against material reduction at the attachment points, as this would compromise the aesthetic integrity of the 46mm case. Milano Straps supplies bespoke straps with 18-month warranty and preliminary compatibility verification.

What is the average lifespan of a leather strap on this watch?

A high-quality alligator or calf leather strap, subject to ordinary use, maintains mechanical functionality for 3-4 years. Shell cordovan, due to its structural density, can last 5-6 years. Humidity, prolonged sun exposure and mechanical stress accelerate aging. Patina does not indicate degradation, but the natural evolution of leather.

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.

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