Wear a smartwatch with your Rolex GMT-Master II

Wear a smartwatch with your Rolex GMT-Master II

Smartlet is compatible with the Rolex GMT-Master II. Lug width: 20mm - natively supported with no adapter. Installation uses the standard spring-bar system. No modification to the watch required. Fully reversible in seconds.
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Rolex GMT-Master II compatibility

Wear a smartwatch with your Rolex GMT-Master II

In short Smartlet is compatible with the Rolex GMT-Master II. Lug width: 20mm - natively supported with no adapter. Installation uses the standard spring-bar system. No modification to the watch required. Fully reversible in seconds.

Designed for Pan Am pilots tracking multiple time zones. The Pepsi, Batman, and Root Beer colourways have become icons in their own right. The Submariner tracks depth; the GMT-Master II tracks the world. Smartlet clips your Garmin or Apple Watch onto your GMT strap. Your training data, your heart rate, your recovery metrics all active, all simultaneous.

Wear yours How it works
The problem
Choosing between health data and horological heritage every morning.
The solution
Smartlet One replaces your Rolex GMT-Master II's strap via the standard spring-bar system and positions your smartwatch on the same wrist. Both watches run simultaneously, with no modification to the watch and full reversibility in seconds.
Model
Rolex GMT-Master II
Lug width
20mm
References
39covered
Reversible
In seconds

Choose your edition

One mechanism. Three personalities.

Every Smartlet One includes the dedicated adapter for your wearable. Pick the finish that matches your style.

Smartlet One - Shadow - Smartlet

For the explorer

Smartlet One - Shadow

€399,00

4.9 (17)

Stealth. Switch in seconds, leave no trace.

  • Material SS316L steel, black PVD
  • Weight ~100g
  • Compatible with Rolex, Omega, Seiko + 100 more
Buy now
Compatibility

Rolex GMT-Master II models supported

Covered references

39 references covered.

ReferenceMaterialDialLugSmartlet
6542904L stainless steel 40mmBlack20mmCompatible
1675904L stainless steel 40mmBlue-Red (Pepsi)20mmCompatible
1675904L stainless steel 40mmBlack (Matte)20mmCompatible
16750904L stainless steel 40mmBlack20mmCompatible
1675 Tiffany904L stainless steel 40mmPepsi20mmCompatible
16700-BKSteel 40mmBlack20mmCompatible
16700-PSteel 40mmBlue/Red20mmCompatible
16710-BLROSteel 40mmBlue/Red20mmCompatible
16750-GLSSteel 40mmBlack Gloss20mmCompatible
16750-BLRO-GLSSteel 40mmBlack20mmCompatible
16760Steel 40mmBlack/Red20mmCompatible
16710-COKESteel 40mmBlack/Red20mmCompatible
16753Steel/Gold 40mmBrown/Gold20mmCompatible
16718Yellow Gold 40mmBlack20mmCompatible
116718LN-GNYellow Gold 40mmGreen20mmCompatible
116718-GRNYellow Gold 40mmGreen20mmCompatible
16760904L stainless steel 40mmBlack-Red (Coke)20mmCompatible
16710904L stainless steel 40mmBlack20mmCompatible
16710 Pepsi904L stainless steel 40mmBlue-Red20mmCompatible
16710Steel 40mmBlack/Red20mmCompatible
16713Steel/Gold 40mmBrown/Black20mmCompatible
116710LNSteel 40mmBlack20mmCompatible
116710LN904L stainless steel 40mmBlack20mmCompatible
116710BLNRSteel 40mmBlack/Blue20mmCompatible
116710BLNR904L stainless steel 40mmBlack20mmCompatible
126715CHNRRose Gold 40mmBlack/Brown20mmCompatible
126710BLROSteel 40mmBlack20mmCompatible
126711CHNR-2TSteel/Rg 40mmBlack/Brown20mmCompatible
126711CHNRSteel/Rose Gold 40mmBlack/Brown20mmCompatible
126715CHNREverose gold 40mmBlack20mmCompatible
126710BLRO904L stainless steel 40mmBlack20mmCompatible
126711CHNRRolesor Everose 40mmBlack20mmCompatible
126710BLNRSteel 40mmBlack/Blue20mmCompatible
126710BLNR904L stainless steel 40mmBlack20mmCompatible
126720VTNRSteel 40mmBlack/Green20mmCompatible
126720VTNR904L stainless steel 40mmBlack20mmCompatible
1675-MATTESteel 40mmBlack20mmCompatible
1675Steel 40mmBlack20mmCompatible
16750Steel 40mmBlack20mmCompatible

Rolex GMT-Master II lug widths: 20mm

Designed for Pan Am pilots tracking multiple time zones. The Pepsi, Batman, and Root Beer colourways have become icons in their own right. The Submariner tracks depth; the GMT-Master II tracks the world. Smartlet clips your Garmin or Apple Watch onto your GMT strap. Your training data, your heart rate, your recovery metrics all active, all simultaneous.
Frequently paired

Smartwatches worn with Rolex GMT-Master II

The most common combinations our customers wear. Find your mechanical watch and discover the right Smartlet edition.

Apple Watch
Series 0 to Ultra 3
Whoop
5.0 / MG
Garmin Forerunner
255 to 965
Samsung Galaxy Watch
Series 4 to 7
Withings ScanWatch
Light / 2 / Nova
View all brands
27 brands covered
Combination guides

Wear it both ways

Rolex GMT-Master II + Apple Watch
Apple Watch
→
Rolex GMT-Master II + Whoop
Whoop
→
Also compatible

Other brands

Other iconic models in the Smartlet compatibility library.

Submariner
Daytona
Datejust
Yacht-Master
Sky-Dweller
Explorer
Seamaster 300m
Speedmaster
Planet Ocean
Constellation
De Ville
Monaco
Carrera
Formula 1
Aquaracer
Portugieser
Navitimer
Superocean
Avenger
Black Bay
Pelagos
Ranger
Luminor
Radiomir
Submersible
SKX
Prospex
Presage
Khaki Field
BR 03-92
Fifty Fathoms
Reverso
SUB 300
Spring Drive
Essence Leggera
Aquis
Divers Sixty-Five
Chronograph 1
Captain Cook
Superman Heritage
El Primero
Monarch
Black Bay 58 GMT
View all models
Watch brand compatibility guide

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

  • Does Smartlet work with the Rolex GMT-Master II?
    Yes. The Rolex GMT-Master II uses a 20mm lug width and is fully compatible with Smartlet. Smartlet replaces the standard strap via the spring-bar system. No modification to the watch is required. The setup is fully reversible.
  • Will Smartlet scratch or damage my Rolex GMT-Master II?
    No. Smartlet replaces the strap only and makes no contact with the Rolex GMT-Master II case or crystal. All contact points are non-abrasive. The system is fully reversible and leaves no trace on the watch.
  • Which smartwatches can I wear with my Rolex GMT-Master II?
    Smartlet is compatible with Apple Watch, Samsung Galaxy Watch, Garmin Forerunner, Garmin Venu, Google Pixel Watch, Polar Vantage, Fitbit Charge, Huawei Watch GT, Withings ScanWatch, Coros, Suunto, and Whoop. The Rolex GMT-Master II with its 20mm lug width is compatible with the full Smartlet range.
  • Where can I buy Smartlet for the Rolex GMT-Master II?
    Smartlet is available at smartlet.io in Classic, Shadow, and Titanium finishes. Compatible with the Rolex GMT-Master II and its 20mm lug width. No additional accessory required for standard lug widths between 18mm and 24mm.
  • 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.