TAG Heuer · TAG Heuer Heuer 02

TAG Heuer Carrera Chronograph, Monaco and Autavia power reserve: inside the Heuer 02

The TAG Heuer Carrera Chronograph, Monaco Heuer 02, Autavia and Carrera Glassbox all run on the Heuer 02 family, which lasts about 80 hours off the wrist. That's three and a third days, enough to sit out a full weekend in a drawer.

Updated September 2026 · Based on manufacturer specs, published reviews and watchmaker/owner reports

Watches that use the Heuer 02

If you own a TAG Heuer automatic chronograph made since 2017 with counters at 3, 6 and 9 o'clock (or 3 and 9 plus small seconds), it very likely has a Heuer 02 inside. Since 2023, TAG Heuer has called its updated versions the TH20 family (TH20-00 and others). They're the same basic movement with a few changes, most importantly two-way winding.

Not every TAG Heuer chronograph has it. Formula 1 chronographs are mostly quartz or Sellita/ETA-based, older Carreras used the Heuer 01 or the Calibre 16, and the Steve McQueen Monaco kept the Calibre 11 for years.

Specs at a glance

History and where it came from

TAG Heuer's first in-house chronograph, the Calibre 1887, was based on a Seiko design it had licensed. The Heuer 01 of 2015 was its own design built on that base. The real clean-sheet project was the CH 80, a chronograph with 80 hours of reserve that TAG Heuer showed around 2013 and then shelved. Monochrome describes the Heuer 02 as "the son of the never produced Calibre CH-80, which has been reworked and improved".

It finally appeared in 2017 in the reissued Autavia, the model chosen by fans in TAG Heuer's online "Autavia Cup" vote. In 2018 it went into the skeletonised 43 mm Carrera Heuer 02 and a 45 mm GMT version, in 2019 the Monaco switched from the ETA-based Calibre 12 to the Heuer 02, and in 2020 it arrived in the cleaner-dialled Carrera Chronograph 42 mm and the 44 mm Carrera Sport.

In 2023 the 39 mm Carrera Glassbox introduced the TH20-00. Monochrome calls it "an updated Heuer 02 movement". The big change is winding: earlier Heuer 02s only charged the mainspring when the rotor turned anti-clockwise, and the TH20-00 winds in both directions. TAG Heuer has since built flyback, COSC and carbon-hairspring versions (the TH20-60 with the TH-Carbonspring, for example), but the architecture and 80-hour reserve stay the same.

Accuracy in the real world

For standard Carrera and Monaco models, TAG Heuer doesn't publish an accuracy figure, and the movement isn't sent to COSC. Owner reports on watch forums are generally good, with many describing single-digit daily rates, though as with any movement there's variation and some watches need regulating.

A few things work in its favour. The 4 Hz beat is stable, the 80-hour mainspring keeps the balance amplitude up for longer than a 40-hour movement, and the vertical clutch means that running the chronograph doesn't cause the jump or the drop in amplitude that a traditional lateral clutch can. You can leave the chronograph running as a seconds hand without meaningfully hurting timekeeping.

Where it's certified, the specs are clear. The 2022 Autavia 60th Anniversary Flyback uses a COSC-certified Heuer 02, and TAG Heuer's newer TH20-60 and similar calibres are chronometers too. Monochrome notes that the TH20-00's two-way winding keeps the spring better charged, which helps rate stability.

Reliability and servicing

The Heuer 02 has been in production since 2017 without a widely reported systemic fault. Integrated column-wheel chronographs are more complex than a three-hander, though, and that shows up in service.

• Brand service. It's a proprietary TAG Heuer movement, so servicing goes through TAG Heuer or its authorised network. Parts for independents are limited.
• Cost. A chronograph service costs more than a three-hand one. Budget accordingly, especially outside warranty.
• Warranty. Warranty terms have changed over the years and differ by model, so check your card for the exact cover on a Heuer 02 watch.

Quirks worth knowing

• One-way winding on early versions. A Heuer 02 from 2017 to 2022 only winds when the rotor turns anti-clockwise. On the wrist you won't notice, but on a mechanical winder, set it to anti-clockwise or both directions.
• Thicker case. The Heuer 02 is a 31 mm integrated chronograph, bigger than the modular movement it replaced in the Monaco. That's why the Monaco Heuer 02 is a little thicker.
• Crown position. In the Monaco Heuer 02, the integrated movement puts the crown level with the pushers, where the old modular Calibre 12 had it offset. It's a small change, but it is how you tell them apart at a glance.
• The date. Most versions have a date. Don't set it late at night. Here's why.

How it compares

• Valjoux 7750: the industry-standard automatic chronograph. Any watchmaker can service it, but it has a cam instead of a column wheel, a lateral clutch and about 42 hours of reserve.
• Rolex 4130: the Daytona's movement. Also a column wheel and vertical clutch, with 72 hours and Rolex's own certification.
• Omega 9900: Omega's co-axial chronograph, with 60 hours and Master Chronometer certification.
• Zenith El Primero 400: TAG Heuer's LVMH sister, at a faster 5 Hz but with about 50 hours.
• TAG Heuer Calibre 5: the three-hand Carrera and Aquaracer movement, with less than half the reserve at 38 hours.

Living with the 80-hour reserve

Eighty hours is unusual for a chronograph, and it changes how the watch fits a rotation. Take your Carrera Chronograph off at 6pm on Friday and it's still running at 2am on Tuesday. A Monaco saved for weekends can sit out Monday to Thursday and still need winding before Saturday, but not if it came off full on Sunday evening.

Two things eat into that. A partly wound spring is the usual one, and early Heuer 02s wind one way only, so a watch worn briefly on a quiet day may not be as full as you'd think. Before a long break, give it a good wind by the crown. Watch Winder counts down this 80-hour reserve for each watch you own and reminds you before it stops. To check a specific weekend, try the "Will my watch stop?" calculator.

Verdict

The Heuer 02 is the movement that made TAG Heuer's chronographs properly competitive. It has a column wheel, a vertical clutch and an 80-hour reserve at prices well below a Rolex or Omega chronograph, and it's in the watches people actually want: the Carrera, the Monaco and the Glassbox. The trade-offs are proprietary servicing, a chunkier movement and one-way winding on the early versions, which the TH20-00 fixed. If you're choosing between a Heuer 02 and a Valjoux 7750-based chronograph at a similar price, the Heuer 02 is the better movement.

FAQ

How long does a TAG Heuer Carrera Chronograph run off the wrist?

A Carrera Chronograph with the Heuer 02 or TH20-00 runs for about 80 hours from a full wind, roughly three and a third days. If it was only partly wound, it will stop sooner.

What is the power reserve of the TAG Heuer Monaco Heuer 02?

The Monaco Heuer 02 has an 80-hour power reserve. The earlier Monaco Calibre 12 and Calibre 11 models have much less, at roughly 40 hours.

Is the TAG Heuer Carrera Glassbox movement a Heuer 02?

Yes, in effect. The Glassbox uses the TH20-00, which is an updated Heuer 02 with the same 80-hour reserve but with bidirectional winding.

Why did my TAG Heuer Monaco stop even though it has an 80-hour reserve?

It probably wasn't fully wound. Early Heuer 02s only wind in one rotor direction, so light wear may leave the spring well short of full; give it a good wind by the crown before a long rest.

Is the Heuer 02 an in-house movement?

Yes. TAG Heuer developed and manufactures it, starting from its unreleased CH 80 project, and uses it only in its own watches.

Can I leave the chronograph running on a TAG Heuer Carrera?

Yes. The Heuer 02 uses a vertical clutch, so running the chronograph continuously causes little wear and doesn't meaningfully affect timekeeping, though it does use a little extra power.

How accurate is the TAG Heuer Carrera Heuer 02?

TAG Heuer doesn't publish a figure for standard models, and owners generally report single-digit daily rates. Some versions, such as the Autavia 60th Anniversary Flyback, are COSC-certified to -4/+6 seconds a day.

Sources

• Monochrome: TAG Heuer Autavia 2017 with Calibre Heuer 02
• Monochrome: TAG Heuer Monaco Heuer 02 CBL2111 hands-on
• Monochrome: TAG Heuer Carrera Chronograph 42mm Calibre Heuer 02
• Monochrome: 2023 Carrera Chronograph Glassbox with calibre TH20-00
• Monochrome: TAG Heuer Autavia 60th Anniversary Flyback Chronograph

Keeping it running

• On an average day an automatic gains roughly 4 hours of reserve per hour on the wrist, so about 20 hours of wear fills the TAG Heuer Heuer 02. Desk days charge more slowly.
• Most automatics can also be wound by the crown. If yours has stopped, a few dozen turns gets it going before you put it on.
• Off the wrist it stops about 80 hours after it was last full. Stopped sooner?
• On a watch winder, start at about 650 turns per day, both directions. Winder settings for every movement.
• If it does stop, don't set the date between 9pm and 3am. Check if it's safe.

All TAG Heuer movements · Other 80-hour movements

Never let it stop

Watch Winder counts down the reserve of every watch you own and reminds you before one stops. It already knows the TAG Heuer Heuer 02: type your watch's name and the reserve fills itself in.

Manufacturer's published figure. Real reserve varies with the watch's age and service; check your manual.