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TAG Heuer · Formula 1

Strap for TAG Heuer Formula 1 CAU1111.BA0858

The Formula 1 Quartz Chronograph 42 Stainless Steel / White / Bracelet takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

20mm
20 mm strapsAll TAG Heuer
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Lug width20 mm
Case diameter42 mm
ReferenceCAU1111.BA0858 (aka: CAU1111BA0858, CAU1111)
FamilyFormula 1
MovementRonda caliber 5040.D Hours, Minutes, Small seconds | Date | Chronograph
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

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

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What I'm asked about the TAG Heuer Formula 1 CAU1111.BA0858

What strap size does the TAG Heuer Formula 1 CAU1111.BA0858 take?

The TAG Heuer Formula 1 CAU1111.BA0858 needs 20 mm between the lugs, usually 16 mm at the buckle. It's the size I've been fitting on it for years.

Can the strap on the TAG Heuer Formula 1 CAU1111.BA0858 be changed?

Yes. It has spring bars between the lugs: with the right tool the strap comes off in a minute. If you'd rather not risk a scratch, I do it in the workshop.

Can I put a leather strap on the TAG Heuer Formula 1 CAU1111.BA0858?

Yes, in 20 mm leather. On a 42 mm chronograph I like box calf: it holds its shape and carries a substantial case.

Which strap do you recommend for the TAG Heuer Formula 1 CAU1111.BA0858?

A 20 mm box calf. You'll find it ready in the 20 mm collection. If you'd rather have something built on your wrist, the Casati atelier.

Straps for the Formula 1 CAU1111.BA0858

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Formula 1 CAU1111.BA0858, seen from the bench

The TAG Heuer Formula 1 CAU1111.BA0858 is a 42mm stainless steel chronograph with a white dial, part of the brand's sports watch legacy. Powered by a Ronda caliber 5040.D movement, it features hours, minutes, small seconds, date, and chronograph function. The 20mm lug width is essential for strap compatibility and ensures secure attachment and proper visual proportions.

Frequently asked questions

What is the best strap for the TAG Heuer Formula 1 CAU1111.BA0858?

The optimal choice depends on intended use and aesthetic preference. Alligator leather with vegetable tanning is the classical choice for daily elegant wear, with natural aging over time. Shell cordovan is ideal for those seeking water and perspiration resistance. Grained calf offers a balance between elegance and practicality. For pure sports use, a ballistic nylon NATO remains unmatched in functionality.

Is an aftermarket strap compatible with the TAG Heuer Formula 1 CAU1111.BA0858?

Yes, provided the strap has a 20mm lug width. High-quality aftermarket artisan straps (leather, rubber, fabric) fit perfectly to the Formula 1 case lugs. It is advisable to purchase from specialised artisans who control tolerance precision and material quality to ensure longevity and aesthetic coherence.

How long does a leather strap last on a TAG Heuer Formula 1 CAU1111.BA0858?

Durability depends on leather quality and usage intensity. High-quality alligator or calf leather with vegetable tanning lasts 3-5 years with ordinary maintenance (light cleaning, drying after exposure to moisture). Shell cordovan is more durable and can last 5-7 years. Natural aging is part of the appeal: the strap visibly ages, developing patina and character. The 18-month warranty from professional artisans covers manufacturing defects.

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

The atelier's website: casatimilano.com