Wear your Suunto with your mechanical watch | Smartlet
Wear your Suunto
and your mechanical watch
at the same time
Suunto is the navigator's choice - precision barometric altimeter, Finnish-engineered GPS, heat and altitude acclimatization tracking, and training load analysis trusted by mountaineers and trail runners. Your Rolex Explorer or Panerai Luminor occupies a different altitude entirely. Smartlet One clips your Suunto onto any mechanical watch strap via a 20mm adapter. Note: Suunto 9 Baro, 9 Peak Pro, Vertical, and Vertical Steel use a 24mm lug width, which is natively supported by Smartlet. No adapter required. Both instruments coexist on the same wrist. All Suunto sensors maintain the wrist contact required for accurate biometrics.
How it works
Classic, Shadow, or Titanium. Match your mechanical watch case material and aesthetic. No tools required at this stage.
Attach the Smartlet adapter to your watch lugs. The spring-loaded mechanism locks in place with zero metal-to-metal case contact. Fully reversible in seconds.
Attach the Smartlet adapter to your Suunto. It locks securely. Both watches sit on the same wrist. All sensors remain in contact with your skin.
Suunto models supported
| Series | Smartlet compatible | Lug width | Release year | Case size |
|---|---|---|---|---|
| Suunto 9 Baro | Compatible | 24 mm | 2019 | 49mm |
| Suunto 9 Peak | Compatible | 22mm | 2021 | 43mm |
| Suunto 9 Peak Pro | Compatible | 24 mm | 2023 | 49mm |
| Suunto Race | Compatible | 22mm | 2023 | 46mm |
| Suunto Race S | Compatible | 20mm | 2023 | 43mm |
| Suunto Vertical | Compatible | 24 mm | 2023 | 49mm |
| Suunto Vertical Steel | Compatible | 24 mm | 2023 | 49mm |
Mechanical watches worn with Suunto
Other smartwatches
Frequently asked
Can I wear a Suunto and a mechanical watch at the same time?
Yes. Smartlet One is a modular adapter that clips onto any mechanical watch via an 18mm to 24mm adapter, allowing you to simultaneously wear your Suunto on the same wrist. Both watches operate independently. No modification required.
Which Suunto models are compatible with Smartlet?
Suunto 9 Peak, 9 Peak Pro, Race, Race S, and Vertical are all compatible with Smartlet. The Race S uses 20mm lugs and the Race and 9 Peak use 22mm lugs - both natively supported. The 9 Baro, 9 Peak Pro, Vertical, and Vertical Steel use 24mm lugs, natively supported by Smartlet.
Will Suunto sensors still work when attached to Smartlet?
Yes. All Suunto health sensors including optical heart rate, SpO2, and HRV maintain full wrist contact via Smartlet. Suunto's barometric altimeter, GPS, and weather trend features are hardware-based and completely unaffected.
Does Smartlet work with Suunto Vertical?
Yes. The Suunto Vertical (49mm) uses a 24mm lug width and is fully compatible with Smartlet natively. No adapter required. All health sensors, GPS, and barometric altimeter remain fully operational.