Wear a smartwatch with your Rolex Cosmograph Daytona

Wear a smartwatch with your Rolex Cosmograph Daytona

Smartlet is compatible with the Rolex Cosmograph Daytona. Lug width: 19mm / 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 Cosmograph Daytona compatibility

Wear a smartwatch with your Rolex Cosmograph Daytona

In short Smartlet is compatible with the Rolex Cosmograph Daytona. Lug width: 19mm / 20mm - natively supported with no adapter. Installation uses the standard spring-bar system. No modification to the watch required. Fully reversible in seconds.

The Daytona was designed for endurance racing drivers. Its tachymetre bezel calculates average speed over a known distance. The in-house 4130 movement powers 72 hours of reserve with a column-wheel chronograph mechanism that rivals movements twice its price. Smartlet replaces your Daytona strap and clips your Apple Watch or Garmin onto the same wrist via its native 20mm lug. Your lap times and your heart rate. Both recorded simultaneously.

Wear yours How it works
The problem
Choosing between health data and horological heritage every morning.
The solution
Smartlet One replaces your Rolex Cosmograph Daytona'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 Cosmograph Daytona
Lug width
19mm / 20mm
References
37covered
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 Cosmograph Daytona models supported

Covered references

37 references covered.

ReferenceMaterialDialLugSmartlet
116509White Gold 40mmBlue20mmCompatible
116509White Gold 40mmBlack20mmCompatible
126508-BKYellow Gold 40mmBlack20mmCompatible
116508Yellow Gold 40mmGreen20mmCompatible
116508Yellow Gold 40mmChampagne20mmCompatible
6239-PNSteel 40mmWhite/Black20mmCompatible
6239904L stainless steel 40mmSilver Panda19mmCompatible
6239904L stainless steel 40mmBlack Reverse Panda19mmCompatible
6241904L stainless steel 40mmBlack Exotic19mmCompatible
6239904L stainless steel 40mmCream Exotic19mmCompatible
6239 Tiffany904L stainless steel 40mmCream Exotic19mmCompatible
6263904L stainless steel 40mmBlack20mmCompatible
6265904L stainless steel 40mmSilver20mmCompatible
16520-BKSteel 40mmBlack20mmCompatible
16520-WHSteel 40mmWhite20mmCompatible
16520-BKSteel 40mmBlack20mmCompatible
16520904L stainless steel 40mmWhite20mmCompatible
116520-BKSteel 40mmBlack20mmCompatible
116520-WHSteel 40mmWhite20mmCompatible
116523-WHSteel/Gold 40mmWhite20mmCompatible
116520904L stainless steel 40mmBlack20mmCompatible
116505Everose gold 40mmChocolate20mmCompatible
116505Everose gold 40mmBlack20mmCompatible
116506Platinum 40mmIce Blue20mmCompatible
116500LN-BKSteel 40mmBlack20mmCompatible
116500LN-WHSteel 40mmWhite20mmCompatible
116500LN904L stainless steel 40mmWhite20mmCompatible
116503Rolesor yellow 40mmWhite20mmCompatible
116503Rolesor yellow 40mmBlack20mmCompatible
126505-CHOCRose Gold 40mmChocolate20mmCompatible
126500LN-WHSteel 40mmWhite20mmCompatible
126500LN904L stainless steel 40mmWhite20mmCompatible
6234904L stainless steel 40mmSilver20mmCompatible
6234904L stainless steel 40mmBlack20mmCompatible
6234904L stainless steel 40mmCream20mmCompatible
6238904L stainless steel 40mmSilver20mmCompatible
6238904L stainless steel 40mmBlack20mmCompatible

Rolex Cosmograph Daytona lug widths: 19mm / 20mm

The Daytona was designed for endurance racing drivers. Its tachymetre bezel calculates average speed over a known distance. The in-house 4130 movement powers 72 hours of reserve with a column-wheel chronograph mechanism that rivals movements twice its price. Smartlet replaces your Daytona strap and clips your Apple Watch or Garmin onto the same wrist via its native 20mm lug. Your lap times and your heart rate. Both recorded simultaneously. The 2026 Watches and Wonders collection added a Rolesium Cosmograph Daytona with a grand feu enamel dial and anthracite Cerachrom bezel.
Frequently paired

Smartwatches worn with Rolex Cosmograph Daytona

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 Cosmograph Daytona + Apple Watch
Apple Watch
→
Rolex Cosmograph Daytona + Whoop
Whoop
→
Also compatible

Other brands

Other iconic models in the Smartlet compatibility library.

Submariner
GMT-Master
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 Cosmograph Daytona?
    Yes. The Rolex Cosmograph Daytona uses a 19mm / 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 Cosmograph Daytona?
    No. Smartlet replaces the strap only and makes no contact with the Rolex Cosmograph Daytona 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 Cosmograph Daytona?
    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 Cosmograph Daytona with its 19mm / 20mm lug width is compatible with the full Smartlet range.
  • Where can I buy Smartlet for the Rolex Cosmograph Daytona?
    Smartlet is available at smartlet.io in Classic, Shadow, and Titanium finishes. Compatible with the Rolex Cosmograph Daytona and its 19mm / 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.