Tudor Monarch & Fitbit Air on the same wrist

Tudor Monarch & Fitbit Air on the same wrist

Yes. Despite its integrated look, the Tudor Monarch uses standard 20mm spring-bar lugs, supported by Smartlet One with a dedicated Fitbit Air adapter. The Monarch mounts on the outer wrist; the Air keeps full skin contact on the inner wrist.
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Compatibility guide

Tudor Monarch & Fitbit Air on the same wrist

Tudor Monarch + Fitbit Air
Yes. Despite its integrated look, the Tudor Monarch uses standard 20mm spring-bar lugs, supported by Smartlet One with a dedicated Fitbit Air adapter. The Monarch mounts on the outer wrist; the Air keeps full skin contact on the inner wrist.
Tudor Monarch lug width
20mm
Fitbit Air compatibility
Screenless tracker (2026)
Adapter
Dedicated Fitbit Air adapter
Sensor architecture
Full skin contact

Why the Tudor Monarch and Fitbit Air belong to the same wrist

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Is the Tudor Monarch compatible with Fitbit Air on Smartlet?

Compatible
Yes. Despite its integrated look, the Tudor Monarch uses standard 20mm spring-bar lugs, supported by Smartlet One with a dedicated Fitbit Air adapter. The Monarch mounts on the outer wrist; the Air keeps full skin contact on the inner wrist.
Tudor Monarch lug width
20mm Supported
Standard spring-bar system
Fitbit Air model
Screenless tracker (2026)
Dedicated Fitbit Air adapter
Sensor architecture
Full skin contact
Inner wrist position
Reversible
In seconds
No modification to the watch

Related compatibility guides

Model guide
Tudor Monarch
→
Brand guide
All Tudor models
→
Smartwatch guide
Fitbit Air compatibility
→

More ways to wear Smartlet

Tudor Monarch + Apple Watch
Tudor Monarch
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Rolex Submariner + Fitbit Air
Rolex Submariner
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Rolex Datejust + Fitbit Air
Rolex Datejust
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Step by step

Replace your strap
01

Replace your strap

Smartlet replaces your mechanical watch strap via the standard spring-bar system. Classic, Shadow, or Titanium. No tools required.

Connect your wearable
02

Connect your wearable

Smartlet uses a dedicated adapter or native lug pins depending on your smartwatch. The connector snaps onto the Smartlet module. Zero modification to the mechanical watch.

Wear both simultaneously
03

Wear both simultaneously

Both watches sit on the same wrist. All smartwatch sensors maintain direct skin contact and operate normally.

Questions

Frequently asked questions

  • Is the Monarch's bracelet removable for Smartlet?
    Yes. The H-link bracelet attaches via standard spring bars; the case engravings only suggest integration. Smartlet One replaces the bracelet in seconds, fully reversibly.
  • Which Monarch reference is compatible?
    The launch reference M2639W1A0U-0001, with its dark champagne California dial, is fully compatible in 20mm.
  • How does the Fitbit Air attach?
    Via its dedicated Smartlet adapter, positioning the Air flat against the inner wrist for full sensor contact.
  • Does Smartlet damage or modify my mechanical watch?
    No. Smartlet replaces your standard watch strap using the existing spring-bar system. It makes no permanent modification to the watch case, lugs, or dial. The process is fully reversible in seconds. Your mechanical watch is unaffected and can be worn independently at any time by reinstalling its original strap. Smartlet is engineered to watchmaker tolerances and tested with the same care that goes into the watches it pairs with.