The Black Bay 58 GMT is the watch Tudor fans spent about six years asking for: a proper GMT in the 39mm Fifty-Eight case, with the black and burgundy bezel that everybody wanted and nobody expected to actually get.
It is also, quietly, the hardest Tudor in the range to put a strap on. Not because of the fit — that part is simple, and I will cover it in a second — but because there is more going on colour-wise here than on any other Black Bay 58. Get that wrong and the watch looks busy. Get it right and it is one of the best-looking things on a wrist at any price.
Strap size and fit guide (do this bit properly)
Your Tudor Black Bay 58 GMT (Ref. M7939G1A0NRU) has a 39mm case and a 20mm lug width. Tudor states 20mm on every version — the rivet-style bracelet, the five-link bracelet and the rubber.
On Helvetus product pages, select "Black Bay Fifty-Eight GMT" as the model option.
Now the part that actually costs people money. There are three Tudor GMTs on sale, and two of them have almost the same name:
| Watch | Case | Lug width |
|---|---|---|
| Black Bay GMT (the "Pepsi") | 41mm | 22mm |
| Black Bay 58 GMT | 39mm | 20mm |
| Black Bay Pro | 39mm | 20mm |
"Black Bay GMT" and "Black Bay Fifty-Eight GMT" sit next to each other in the model list, and they are two millimetres apart. If you own the 58 GMT and you select "Black Bay GMT" because you skimmed, you have ordered a 22mm strap for a 20mm watch. It will not fit, and it is by far the most common mistake on this reference.
Checklist: 39mm case, 20mm lugs, select "Black Bay Fifty-Eight GMT". Read the word "Fifty-Eight" before you check out.
The short history bit
The Black Bay 58 line takes its name from 1958, the year Tudor released ref. 7924 — the "Big Crown", the brand's first dive watch rated to 200m. The 58 GMT arrived in 2024 and did something the 41mm Black Bay GMT never did: it put the travel complication into the smaller, more wearable case.
The specifics: a 24-hour bidirectional bezel with a black and burgundy anodised aluminium insert and a gilt 24-hour track, a domed sapphire crystal, a slim screw-down crown set flush against the case so the tube does not show, and 200m of water resistance. Inside is the Calibre MT5450-U, chronometer certified and Master Chronometer certified, good for around 65 hours and resistant to 15,000 gauss.
Collectors love it for the bezel. That black-and-burgundy combination has been the great "why doesn't anyone make this" colourway for years, and Tudor got there first with a warm, gilt-toned take on it that arguably suits a vintage-styled watch better than a crisp modern one ever would.
Why straps are harder on this watch than on a normal BB58
Here is the thing that separates this reference from every other Black Bay 58.
There are three colour systems running at the same time. The bezel gives you black and burgundy. The 24-hour track and the dial printing are gilt. The hands and applied markers are rose-gold coloured, filled with cream-toned lume. That is a lot of warmth and a lot of contrast on one small watch, and it is why so many straps that look great on a plain BB58 look cluttered on this one. Even other strap specialists have said out loud that the 58 GMT is a tricky one to pair.
So the rule for this reference is simple, and it is the whole guide in one line: either echo a colour the watch already has, or go fully neutral. Never introduce a fourth colour. A green or bright blue strap has nothing to hold onto here and immediately makes the watch look like it is wearing someone else's clothes.
The second reason to swap is physical. At 12.8mm the 58 GMT is close to a full millimetre thicker than the standard Black Bay 58, on the same 39mm case and the same lug-to-lug of about 47.8mm. That extra height is the one thing people criticise about this watch. A steel bracelet makes it read taller, because the end links have to clear the case before they start to bend. Rubber sits the case lower and closer to the wrist, and the watch immediately looks and feels less tall. Tudor sells the 58 GMT on rubber with the T-fit clasp straight from the catalogue, so this is not an aftermarket idea — it is one of the three ways the watch is officially configured.
The best strap colours for the Black Bay 58 GMT
Black with Red Line LuxLine® — the hero, and it is not close. This is the bezel, translated into a strap. Black body for the black half of the insert, a single clean line for the burgundy half. It echoes what the watch already is instead of adding anything new, which is exactly what this reference needs. On the wrist it reads as deliberate — like the strap was specified with the watch rather than chosen afterwards — and the line picks up the burgundy from across a room in a way a plain strap never manages. If you buy one strap for this watch, buy this one. Black w/Red Line LuxLine® Tudor Black Bay Strap
Bordeaux — the full commitment. Where the LuxLine hints at the burgundy, this one goes all in. Deep bordeaux against a black gilt dial is a properly rich combination, and it makes the warm half of the bezel the centre of the watch rather than a detail. It also does something clever: because the strap is warm, the gilt track and the rose-gold markers stop looking like separate accents and start looking like one connected idea. This is the strap for anyone who bought the 58 GMT specifically for the colourway. Bordeaux Tudor Black Bay Rubber Strap
Black — the reset button. The neutral strategy, and a genuinely smart one on this watch. With everything else stripped out, the bezel and the gilt become the only colour anywhere, and a busy watch suddenly reads as focused. It is also the most versatile thing you can own for a travel watch, which is what this is — it works with a suit, a hoodie and an airport equally well. If the burgundy options feel like too much for daily wear, start here and add one later. Black Tudor Black Bay Rubber Strap
Brown — the warm one. The third echo, and the one people do not think of. Everything soft on this dial is warm: gilt printing, rose-gold hands, cream lume. Brown rubber continues that all the way down the wrist and turns the 58 GMT into something closer to a vintage travel watch than a modern tool watch. It is particularly good in autumn and with anything tan or olive in your wardrobe, and it is the pick that most changes the watch's personality without breaking the colour rule. Brown Tudor Black Bay Rubber Strap
Everything else in the range is here if you want to compare side by side: All Tudor Black Bay Straps
Getting the order right
One more time, because the names are so close: pick your colour, then select "Black Bay Fifty-Eight GMT". Not "Black Bay GMT" — that is the 41mm watch at 22mm. Not "Black Bay 58" — that is the same case but a different option.
If you own or are cross-shopping the other Tudor GMTs, these will help:
- Tudor Black Bay GMT "Pepsi" 79830RB Strap Guide — 41mm, 22mm lugs
- Tudor Black Bay Fifty-Eight 79030N Strap Guide — the same 39mm case without the GMT
- Tudor Black Bay 41 Blue 79230B Strap Guide — 41mm, 22mm lugs
FAQ
What lug width is the Tudor Black Bay 58 GMT? 20mm. The same as the standard Black Bay 58, and not the same as the 41mm Black Bay GMT, which is 22mm.
Will a Black Bay GMT strap fit the Black Bay 58 GMT? No. The Black Bay GMT is 41mm with 22mm lugs. The 58 GMT is 39mm with 20mm lugs. The names are close, the straps are not interchangeable.
Is the Black Bay 58 GMT the same size as the Black Bay 58? Same 39mm diameter and same 20mm lugs, but the GMT is thicker — 12.8mm against roughly 11.9mm. On Helvetus, still select "Black Bay Fifty-Eight GMT" rather than "Black Bay 58".
Does the Black Bay 58 GMT come on rubber from Tudor? Yes. Tudor offers it on a rivet-style bracelet, a five-link bracelet, or a rubber strap, all with the T-fit clasp.
What strap colour suits the black and burgundy bezel best? Either echo the burgundy — a black strap with a red line, or full bordeaux — or go plain black and let the bezel lead. Avoid colours the watch does not already contain.
Final thoughts
The 58 GMT is a watch people wait years to buy and then wear every single day. A strap makes it sit lower, wear lighter and travel better, and on this particular reference it also lets you choose which part of that busy, brilliant dial you want to bring forward.
Helvetus straps are cut for this exact case, so you get a clean fit at the lugs with no gaps and no guesswork. Every rubber strap is covered by a lifetime warranty, shipping is free worldwide with no import costs, and more than 50,000 customers have already made the swap.
