Chronomat GMT 40 TPD & Winder Settings | Swiss Watch Store
The Breitling Chronomat GMT 40 is an automatic watch: it winds itself from the motion of your wrist, but on the days it sits unworn a watch winder keeps the mainspring topped up. This model carries reference A32398101. It is powered by the Breitling Calibre B32 movement. Below you'll find the exact TPD setting and winding direction the Chronomat GMT 40 needs.
TPD and Winding Direction
The correct setting for the Chronomat GMT 40 is 650 turns per day, bidirectional: 650 turns per day with the rotor turning in both directions.
| Turns per day (TPD) | 650 |
| Rotation direction | Bidirectional |
| Movement | Breitling Calibre B32 |
Why the Correct Setting Matters
An automatic watch is only as accurate as its power reserve allows. Keep the mainspring properly tensioned and the Chronomat GMT 40 will hold its rate and be ready to wear the instant you pick it up — no resetting the time and date. Set the TPD too low and the watch can run down between wears. The movement will not be damaged (modern automatics have a slipping mainspring that prevents overwinding), but an under-wound watch is simply not doing its job. Correct settings are about accuracy and readiness, not safety.
Choosing a Watch Winder for the Chronomat GMT 40
For the Chronomat GMT 40, look for a programmable winder offering a 650 TPD bidirectional programme. One watch? A single winder. Two or more automatics? A double or triple winder keeps the whole rotation ready. You'll find suitable models in our watch winder collection — check the programme list before you buy.
Chronomat GMT 40 Winder FAQs
What's the correct TPD setting for the Chronomat GMT 40?
The Chronomat GMT 40 is specified at 650 turns per day. Most programmable winders offer this as a standard preset.
Which winding direction should I use?
Bidirectional — the winder should rotate in both clockwise and anticlockwise directions.
Can I use any watch winder for my Chronomat GMT 40?
Yes — provided it's programmable. Verify the winder offers 650 turns per day with bidirectional rotation before buying; fixed-setting winders may not match.