Wear your Garmin Forerunner and your mechanical watch at the same time

Wear your Garmin Forerunner and your mechanical watch at the same time

Smartlet is compatible with the Garmin Forerunner 255 to 965 with no adapter required. All health sensors remain fully operational with full skin contact maintained at all times. The setup takes under two minutes and is fully reversible.
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Garmin Forerunner compatibility

Wear your Garmin Forerunner and your mechanical watch at the same time

In short Smartlet is compatible with the Garmin Forerunner 255 to 965 with no adapter required. All health sensors remain fully operational with full skin contact maintained at all times. The setup takes under two minutes and is fully reversible.

The Garmin Forerunner is the reference tool for runners: multi-band GPS, training readiness, heart rate, Pulse Ox, sleep staging. Smartlet positions your Forerunner on the same wrist as your mechanical watch, with every training metric intact.

Wear yours How it works
The problem
Choosing between health data and horological heritage every morning.
The solution
Smartlet replaces your mechanical watch strap and positions your Garmin Forerunner on the same wrist with no adapter required. Wear both simultaneously, without compromise to your watch or your health tracking.
Models
255 to 965
Lug width
mm
Sensors
Multi-band GPS +
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 (16)

Stealth. Switch in seconds, leave no trace.

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

Garmin Forerunner models supported

Garmin Forerunner 255 to 965
Compatible
Smartlet is compatible with the Garmin Forerunner range from 255 to 965. Forerunner models use standard 22mm quick-release bands, natively supported with no adapter required. GPS, heart rate and training metrics remain fully operational with full skin contact.
All Garmin Forerunner sensors remain fully operational

Smartlet positions your wearable with full skin contact maintained at all times. Health data accuracy is unaffected.

Multi-band GPSHeart ratePulse Ox (SpO2)Training readinessSleep stagingRespiratory rate
Frequently paired

Mechanical watches worn with Garmin Forerunner

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

Rolex
Rolex Cosmograph Daytona·Rolex Datejust 41·Rolex Explorer·Rolex GMT-Master II
18.0mm / 19.0mm / 20.0mm / 21.0mm / 22.0mm / 23.0mm
Omega
Omega Aqua Terra·Omega Constellation Co-Axial·Omega De Ville Tresor·Omega Seamaster 300M
18.0mm / 19.0mm / 20.0mm / 21.0mm / 22.0mm / 23.0mm
Tudor
Tudor Black Bay 41·Tudor Pelagos 42·Tudor Ranger·Tudor Monarch
18.0mm / 19.0mm / 20.0mm / 22.0mm
TAG Heuer
TAG Heuer Aquaracer Professional 300·TAG Heuer Carrera Chronograph 42·TAG Heuer Formula 1·TAG Heuer Monaco
18.0mm / 19.0mm / 20.0mm / 21.0mm / 22.0mm
Seiko
Seiko Presage·Seiko Prospex SPB143·Seiko SKX Diver·Seiko Seiko 5
18.0mm / 19.0mm / 20.0mm / 21.0mm / 22.0mm / 23.0mm / 24.0mm
Breitling
Breitling Avenger·Breitling Navitimer B01 43·Breitling Superocean Automatic
20.0mm / 21.0mm / 22.0mm / 24.0mm
IWC
IWC Big Pilot·IWC Portugieser Automatic 40
18.0mm / 20.0mm / 21.0mm / 22.0mm
View all brands
27 brands covered
Also compatible

Other smartwatches

Smartlet works with all major smartwatches via dedicated adapters or native lug widths.

Apple Watch
Samsung Galaxy Watch
Polar Vantage
Google Pixel Watch
Huawei Watch GT
Fitbit Charge
Fitbit Air
Whoop
Garmin Venu
Withings Scanwatch
Coros
Suunto
Panther Eclipse
View all
Smartwatch 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

  • Can I wear a Garmin Forerunner and a mechanical watch at the same time?
    Yes. Smartlet makes it possible to wear your Garmin Forerunner and a mechanical watch simultaneously on the same wrist. Smartlet replaces your mechanical watch strap via the standard spring-bar system and holds your Garmin Forerunner against the same wrist. Both watches run at the same time. All Garmin Forerunner health sensors maintain full skin contact and operate normally. You no longer have to choose between health data and your mechanical watch every morning.
  • Which Garmin Forerunner models are compatible with Smartlet?
    Smartlet is compatible with the Garmin Forerunner 255 to 965. The Garmin Forerunner uses standard 22mm quick-release bands, natively supported by the Smartlet module. Setup takes under two minutes and requires no tools. Smartlet is compatible with any mechanical watch between 18mm and 24mm lug width, covering the vast majority of the market including Rolex, Omega, Tudor, TAG Heuer, Seiko, Breitling, and IWC.
  • Will Garmin Forerunner sensors still work when used with Smartlet?
    Yes, all sensors remain fully operational. Smartlet positions the Garmin Forerunner against your wrist with full skin contact maintained at all times. The following sensors continue to function normally: multi-band gps, heart rate, pulse ox (spo2), training readiness, sleep staging, respiratory rate. There is no interference with the sensor array, and health data accuracy is unaffected.
  • 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.