Tudor fans have been asking for one thing from the Black Bay Chrono for years: a smaller case. With the new Black Bay Chrono 39 “Bumblebee,” that request has finally been granted. The watch introduces a new 39mm case that is also noticeably slimmer than the 41mm original. Add a striking yellow dial, and the result is one of the more talked-about Tudor releases of 2026.
What Makes the Bumblebee Different
The headline change here is size. Previous Black Bay Chrono models all measured 41mm in diameter and 14.4mm in thickness. By comparison, the new Bumblebee measures 39mm wide and just 13.1mm thick. As a result, the watch should wear meaningfully more comfortably on a wider range of wrists.
The lug-to-lug measurement also shrinks, from 49.9mm down to 47mm. Meanwhile, the lug spacing drops to 20mm (from 22mm) for the bracelet. Despite the smaller dimensions, Tudor retained the full 200m water resistance rating of the larger model. As a result, the Bumblebee loses nothing in capability while gaining significant wearability.
This is the same exercise Tudor performed when it released the Black Bay 58 as a smaller alternative to the standard Black Bay. As a result, the Black Bay Chrono 39 opens the door to a whole new family of smaller racing chronographs.
The Yellow Dial and “Bumblebee” Nickname
The most striking feature is the dial. Tudor went with a bright, punchy yellow paired with black sub-dials. This yellow-and-black combination is exactly what earns the watch its “Bumblebee” nickname. Meanwhile, the color choice is a nod to Tudor’s “Tiger” chronographs of the 1990s, which also featured bold yellow tones.
The dial details reward close attention:
- Yellow base with a black minute track and black indexes filled with white Super-LumiNova
- Two black sub-dials for the chronograph and running seconds
- A white date disc with black printing at 6 o’clock
- Redesigned black Snowflake hands (Tudor’s signature) filled with white Super-LumiNova
- A red-tipped central chronograph hand
- Red “200m/660ft” text on the lower dial
As a result, the dial reads as bold but not chaotic. The black accents ground the bright yellow, while the red touches add visual interest without clutter. Tudor also notes the Snowflake hands were redesigned specifically to aid chronograph legibility on the smaller dial.
The Case and Bezel
The 39mm stainless steel case features a predominantly vertical brushed finish. Meanwhile, polished accents appear on the bezel frame, bevels, and case sides. As a result, the case catches light across multiple finishes rather than reading as a single flat surface.
The fixed steel bezel holds a black anodized aluminum insert with a contrasting silver tachymeter scale. As a result, the bezel ties the racing heritage of the chronograph to the bold dial. On the right side of the case sit the Tudor-branded crown and two screw-down pushers at 2 and 4 o’clock.
One update worth noting: the crown returns to a more traditional shape, and the caseback is more domed than previous versions. As a result, the case flanks now appear thinner than the somewhat tall sides of the original 41mm Black Bay Chrono. This mirrors the optimization Tudor introduced on the updated Black Bay 58 earlier in 2026.
The Movement: Calibre MT5813
Here is where the engineering gets impressive. You might expect a smaller, slimmer chronograph to require a different, smaller movement. However, Tudor managed to design the more compact case around the same MT5813 caliber used in the larger 41mm model.
Calibre MT5813 specifications:
- 70-hour power reserve
- 28,800 vph (4 Hz)
- 41 jewels
- Column wheel and vertical clutch construction
- Silicon balance spring with variable inertia balance
- COSC certified, regulated to -2/+4 seconds per day
The MT5813 is produced for Tudor by Kenissi and is based on the architecture of the Breitling B01. As a result, the movement carries serious watchmaking credentials. The -2/+4 seconds per day standard is notably tighter than the -4/+6 seconds standard for uncased COSC movements. For collectors who want to understand more about this caliber, our coverage of the Tudor Black Bay Chrono Carbon 26 goes deeper into the MT5813’s role across Tudor’s chronograph lineup.
The Bracelet and T-Fit Clasp
The Bumblebee comes on a 20mm three-link stainless steel bracelet. Notably, this bracelet eschews the much-debated faux rivets of some earlier Black Bay bracelets in favor of smooth sides. As a result, many collectors will appreciate the cleaner, more refined look.
The bracelet also features Tudor’s well-regarded T-fit clasp with a tool-free micro-adjustment system. This allows roughly 8mm of on-the-fly sizing adjustment without removing links. As a result, sizing the watch precisely becomes simple, which matters especially for buyers whose wrists change size slightly through the day or across seasons.
How the Bumblebee Fits in the Black Bay Chrono Lineup
The Black Bay Chrono has evolved significantly since its 2017 debut. The original launch drew mixed reactions for combining dive watch elements (Snowflake hands, 200m water resistance) with racing cues (tachymeter scale). However, the line gained confidence over the years through Panda editions, the Pink and Flamingo Blue versions, and several F1-themed carbon variants.
Case: 39mm x 13.1mm, 47mm lug-to-lug
Dial: Yellow with black sub-dials
Movement: MT5813, 70-hour power reserve
Price: $6,725
Case: 41mm x 14.4mm, 49.9mm lug-to-lug
Dial: White, black, blue, and other options
Movement: MT5813, 70-hour power reserve
Price: From $6,875
Case: 42mm carbon fiber
Dial: Racing white with yellow accents
Movement: MT5813, 70-hour power reserve
Production: Limited to 2,026 pieces
As a result, the Bumblebee represents a meaningful structural evolution rather than just another colorway. The smaller 39mm case opens the door to future variations, much as the Black Bay 58 did for the diver line.
Who the Bumblebee Is Built For
The Black Bay Chrono 39 “Bumblebee” makes the most sense for collectors who:
- Wanted a smaller, more wearable Black Bay Chrono
- Appreciate bold, statement-making dial colors
- Have wrists that found the 41mm version slightly too large
- Value the same MT5813 movement in a more compact package
- Collect from Tudor’s Daring Watches range
- Want a racing chronograph with genuine dive watch water resistance
For collectors who appreciate the broader appeal of smaller cases, our guide on why vintage watches are smaller explores why more compact proportions often wear better than their dimensions suggest.
The yellow dial is admittedly an acquired taste. As a result, the watch will appeal most to buyers who want something bold rather than understated. However, the smaller case itself is the real story, and future colorways seem likely given the new platform.
How the Bumblebee Compares on Price
At $6,725, the Black Bay Chrono 39 sits just under the 41mm versions, which start at $6,875. As a result, the smaller watch is also slightly more accessible. For shoppers cross-comparing at this price point, several recognizable chronographs compete in the same range, including the Omega Speedmaster Moonwatch Professional, the TAG Heuer Carrera Chronograph, and the IWC Pilot’s Chronograph 41.
As an authorized Tudor dealer, Precision Watches can help buyers weigh the Black Bay Chrono 39 against other options in the brand’s lineup. Meanwhile, those still deciding on budget may find our guide on how much to spend on a first luxury watch helpful for framing the decision.
See Tudor at Precision Watches
For collectors looking for an authorized Tudor dealer in the Philadelphia area, Precision Watches is a family-owned retailer just outside the city in Lower Gwynedd, PA. The showroom carries a wide range of Tudor watches including the Black Bay, Black Bay 58, Pelagos, and Black Bay Chrono references.
While the Bumblebee is part of the more exclusive Daring Watches collection, our team can introduce you to the broader Tudor lineup and discuss current availability. In addition, we offer in-house Tudor watch servicing by our certified watchmakers for buyers thinking about long-term ownership.
For more coverage of the latest models, our new watch releases section covers new watches and industry news
Final Thoughts on the Black Bay Chrono 39 “Bumblebee”
The Black Bay Chrono 39 “Bumblebee” is a genuinely significant release for Tudor. The bold yellow dial will dominate the headlines, but the real story is the smaller, slimmer case. By fitting the same MT5813 movement into a more compact 39mm package, Tudor has shown that a smaller racing chronograph is not only possible but well-executed.
For some collectors, the yellow dial will be the draw. For others, it will be an acquired taste they hope future colorways will expand beyond. However, the underlying platform is what matters most. As a result, the Bumblebee likely represents the first of many smaller Black Bay Chrono variations to come.
For buyers who found the 41mm Black Bay Chrono just slightly too large, the wait is over. The Black Bay Chrono 39 delivers the same capability, the same movement, and the same racing heritage in proportions that work for a far wider range of wrists.
Frequently Asked Questions About the Tudor Black Bay Chrono 39 “Bumblebee”
What is the price of the Tudor Black Bay Chrono 39 Bumblebee?
The Tudor Black Bay Chrono 39 “Bumblebee” retails for $6,725. As a result, it sits just below the 41mm Black Bay Chrono, which starts at $6,875.
What size is the Tudor Black Bay Chrono 39?
The Black Bay Chrono 39 measures 39mm in diameter, 13.1mm in thickness, and 47mm lug-to-lug. By comparison, the standard Black Bay Chrono measures 41mm wide and 14.4mm thick.
Is the Tudor Black Bay Chrono 39 Bumblebee a limited edition?
What movement powers the Black Bay Chrono 39?
The Black Bay Chrono 39 uses the Tudor MT5813, a COSC-certified automatic chronograph movement produced by Kenissi and based on the Breitling B01 architecture. It offers a 70-hour power reserve and is regulated to -2/+4 seconds per day.
Why is it called the Bumblebee?
The nickname comes from the watch’s yellow dial paired with black sub-dials and accents, a color combination reminiscent of a bumblebee. Meanwhile, the yellow tone also references Tudor’s “Tiger” chronographs from the 1990s.
