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Choose the Black Bay by function and overall proportions first, then compare the exact reference and try it on if possible. Diameter is a useful starting point—not a reliable fit verdict on its own. The range spans 37 mm to 43 mm, with dive-style, GMT, adventure-oriented and simpler everyday options.
Start with what you want the watch to do
Decide whether you want a dive-style watch with a conventional time display, a GMT for tracking another time zone, or a different kind of Black Bay. This can narrow the field before you compare case sizes.
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Time-only dive-style models
The 37 mm Black Bay 54 is the compact dive-style option in this group. TUDOR presents it as a tribute to its first dive watch. The 39 mm Black Bay 58 is the brand’s 1950s-inspired diver; compare its exact reference and configuration, since the family includes multiple materials and strap variants.
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The 39 mm Black Bay 58 GMT adds a GMT display in the 58 case format. TUDOR describes it as thinner in profile than the 41 mm Black Bay GMT. The standard Black Bay GMT has a 41 mm steel case, a 24-hour hand and a bidirectional 24-hour bezel. If considering the 39 mm Black Bay Pro, factor in its 14.6 mm thickness as well as its diameter: TUDOR positions it as an adventure-oriented model.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
Other Black Bay directions
The Black Bay 68 is a 43 mm option for someone who wants a larger case presence. TUDOR reports METAS Master Chronometer certification for the 68 family. The Black Bay 31/36/39/41 family offers four case diameters and a more straightforward design without the rotating dive bezel or GMT comparison. The Black Bay Chrono and Bronze are further family branches; check the dimensions and specifications for the exact reference rather than assuming they match another Black Bay.
Compare the sizes without treating diameter as a fit score
TUDOR’s published family sizes give you a useful first comparison. These are manufacturer specifications, not recommendations for a particular wrist.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
| Model or family | Published diameter | What to compare |
|---|---|---|
| Black Bay 54 | 37 mm | Compact, time-only dive-style option; check the exact dial and strap reference. |
| Black Bay 58 and 58 GMT | 39 mm | Choose between the diver and GMT function; the 58 GMT is thinner in profile than the 41 mm GMT, according to TUDOR. |
| Black Bay Pro | 39 mm | Check the 14.6 mm case thickness, not just the diameter. |
| Black Bay GMT | 41 mm | Travel-focused model with a 24-hour GMT hand and bidirectional bezel. |
| Black Bay 68 | 43 mm | Larger-case option; try it rather than assuming it only suits a particular wrist size. |
| Black Bay 31/36/39/41 | 31, 36, 39 or 41 mm | Four-size family; verify current configuration and availability for your market. |
For the Black Bay 54 Blue, TUDOR’s 2026 press specifications list a 37 mm diameter, 11.2 mm thickness and 46 mm lug-to-lug span. Those figures belong to that cited model specification; do not transfer the 46 mm span to every Black Bay. TUDOR’s current Black Bay Pro product page lists 14.6 mm thickness.
Diameter does not tell you how far the lugs extend across your wrist, how tall the case feels, or how a bracelet drapes. No universal wrist-circumference formula is established by the cited TUDOR material, so a size chart alone cannot settle the fit.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Check the exact reference on your wrist
- Shortlist by function. Pick a dive-style time-only model, a GMT, or another Black Bay direction before choosing among sizes.
- Compare the relevant diameters. Use 37 mm for the 54, 39 mm for the 58, 58 GMT and Pro, 41 mm for the standard GMT, and 43 mm for the 68. Keep distinct models separate even when they share a diameter.
- Look up thickness and lug span for the exact reference. The 54 Blue’s 46 mm lug-to-lug measurement is specific to that cited specification, not a range-wide figure.
- Try the exact watch and attachment if possible. Notice whether the lugs extend beyond the top plane of your wrist, whether the case feels too tall, and whether the bracelet sits comfortably. These are practical observations, not a universal sizing test.
- Verify the listing before buying. Confirm the reference, dial, material, strap or bracelet, market and seller. TUDOR notes that models and prices can change.
Include the strap or bracelet in the decision
The same case can feel and look different on a bracelet, rubber strap or fabric strap. TUDOR lists bracelet and rubber-strap configurations for the Black Bay 54. Compare the attachment on the exact reference you plan to buy, including how the bracelet sits and adjusts on your wrist.
For a third-party strap, verify compatibility with the specific case and reference rather than relying on a width measurement alone. TUDOR’s cited Black Bay 54 specification lists a 20 mm lug width, but that does not establish that every 20 mm strap will fit every Black Bay.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Check specifications and availability by reference
Once the model and fit are right, compare secondary specifications that matter to you. TUDOR lists the Black Bay 54 at 200 m water resistance and about 70 hours of power reserve; its 2026 Blue press material gives the model-specific case measurements above. The standard Black Bay GMT is listed at 200 m water resistance. TUDOR’s Black Bay 31/36/39/41 technical sheet, circa 2023, lists 100 m water resistance and reference-specific movements.
Those are not interchangeable family-wide promises. Use the product page or technical sheet for the exact reference, and check current availability in your market; the 31/36/39/41 document is older and does not establish which configurations are currently sold.
Quick Recap
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Sources
- TUDOR Black Bay 54 product page and 2026 Black Bay 54 Blue technical press sheet.
- TUDOR Black Bay 58 family page and Black Bay 58 GMT product page.
- TUDOR Black Bay GMT family page.
- TUDOR Black Bay Pro product page.
- TUDOR Black Bay 68 product page and Black Bay 31/36/39/41 technical sheet.
- TUDOR Black Bay collection and TUDOR Black Bay history.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
