There is one blue Tudor where a blue strap actually works, and this is it.
On most blue watches the dial and the bezel are finished differently — one shifts in the light, the other does not — so a matching strap agrees with the watch at some angles and misses at the rest. The Pelagos Blue does not have that problem, and the reason is worth understanding before you buy anything. All our straps for Tudor are listed in one place, so you can compare colours and fits.
Strap size and fit guide
Your Tudor Pelagos Blue (Ref. M25600TB) has a 42mm case and a 22mm lug width, on standard spring bars, with a 50mm lug-to-lug.
Order from the Pelagos 42 range on Helvetus. This is the same case as the black-dial 25600TN, so those straps are cut correctly for it and the only decision you have is colour.
One warning: you will find this reference listed at 21mm by at least one large retailer. It is wrong — 21mm is the Pelagos 39, a different watch. The 42mm Pelagos is 22mm, Tudor's own supplied rubber strap for it is 22mm, and every in-hand measurement agrees.
The usual Pelagos family caution still applies:
| Watch | Case | Strap fitting |
|---|---|---|
| Pelagos Blue 25600TB | 42mm | 22mm, standard spring bars |
| Pelagos 25600TN / LHD | 42mm | 22mm, standard spring bars |
| Pelagos 39 | 39mm | 21mm |
| Pelagos FXD | 42mm | 22mm, but the bars are fixed into the case |
Checklist: 42mm, 22mm, standard spring bars, order from the Pelagos 42 range.
Why you can match the blue on this one
Here is the part that makes the Pelagos Blue different from every other blue watch Tudor makes.
The dial and the bezel are the same blue, and both are matte. The bezel insert is matt blue ceramic; the dial is matt blue; and people who have handled the watch describe them as sharing a uniform tone rather than merely coordinating. There is no sunray finish, no anodised sheen, no surface that catches light differently from the one next to it.
That matters because on most blue watches you cannot match the blue — you can only match one of the blues. A brushed or sunray dial travels through several tones as your wrist moves while a fixed bezel insert stays put, so a blue strap agrees with the watch at one angle and looks slightly off at every other. It is the single most common way people get a blue watch wrong.
None of that applies here. One blue, two matte surfaces, no movement. A blue strap lands exactly where you intended and stays there.
Tudor evidently agrees, because the strap in your box is blue. The Pelagos Blue ships with a complimentary blue rubber strap and an extra extension piece — where the black-dial version gets a black one. The brand matched its own watch rather than hedging with a neutral.
One colour, everywhere — so the decision is binary
The other thing about this watch: the blue is total. It is not an accent on a dark dial or a stripe on a bezel. It covers the dial and the bezel completely, and everything else on the watch is either satin titanium or white luminous material.
That simplifies the choice more than you might expect. There is no second colour to echo and no third to avoid. You are deciding one thing: join the blue, or step back from it. Everything below is one or the other.
A smaller point that is easy to miss: both surfaces are matte, and so is the titanium. There is nothing glossy anywhere on this watch. A high-shine strap would be the only reflective thing on it, which is why rubber — matte, textured, technical — suits the Pelagos better than polished leather ever will.
The best strap colours for the Pelagos Blue
Navy Blue — the hero, and the one that only works here. This is the match, and on this reference it genuinely lands. Navy sits just under the dial's tone rather than trying to hit it exactly, which reads as intentional rather than as a near-miss, and because the dial and bezel do not shift, it looks the same in every light. The result is a watch that reads as one continuous object from lug to lug — which is what the titanium bracelet does too, but forty grams lighter and without the clasp under your wrist. It is also what Tudor put in the box, so you are not experimenting. Navy Blue Tudor Pelagos 42 Rubber Strap
Black — stepping back so the blue does everything. The other half of the decision. Black adds nothing, which on a watch this saturated is the point: the blue becomes the only colour in the frame and the dial looks deeper than it does against a blue strap. It is also the most versatile thing you can own for this watch — a 42mm 500m diver in bright blue is already a statement, and a black strap lets you decide how loud you want to be on a given day. If you only buy one, this or the navy, and the answer depends entirely on whether you want the watch to announce itself. Black Tudor Pelagos 42 Rubber Strap
Orange — the opposite of blue, and that is not an accident. Orange sits directly across from blue on the colour wheel, which is why the two have been paired on dive equipment for decades — it is the pairing that reads fastest underwater and it is why so much diving kit looks the way it does. On a 500m saturation diver it is a functional colour rather than a fashion one, and against a matte blue dial it is genuinely striking without being a clash. The loudest option here, and the most justified. Orange Tudor Pelagos 42 Rubber Strap
Green — the subtle one, and more interesting than it sounds. Green sits next to blue rather than opposite it, so it is the only strap in the range that extends the watch's colour instead of contrasting with it. The effect is a shift rather than a jump: the blue looks slightly deeper, the titanium looks slightly warmer, and the whole thing reads as a deliberate combination rather than a matched set or a contrast. This is the one people will ask about, and the one that makes a fairly well-known watch look like yours specifically. Green Tudor Pelagos 42 Rubber Strap
Full range for this case: All Tudor Pelagos 42 Straps
Getting the order right
42mm, 22mm, standard spring bars — order from the Pelagos 42 range and the fit is handled. Ignore any listing that says 21mm; that is the Pelagos 39.
If you own other Tudors:
- Best Straps for Tudor Pelagos FXD 25707B — also 42mm and 22mm, but the bars are fixed into the case, so these straps are not interchangeable
- Tudor Black Bay Fifty-Eight Navy Blue 79030B Strap Guide — the other blue Tudor diver, 39mm and 20mm
- Tudor Black Bay Ceramic 79210CNU Strap Guide — 41mm, 22mm
FAQ
What lug width is the Tudor Pelagos Blue? 22mm, on a 42mm case. Some listings state 21mm — that figure belongs to the Pelagos 39.
Can I put a blue strap on a blue watch? On this one, yes. The dial and the ceramic bezel share the same matte blue with no shifting finish, so a blue strap matches consistently rather than only at certain angles. That is not true of every blue Tudor.
Does the Pelagos Blue come with a strap? Yes — a complimentary blue rubber strap with an extra extension piece, alongside the titanium bracelet.
Will a Pelagos 39 strap fit it? No. The Pelagos 39 is 21mm; this is 22mm.
Why does rubber suit it better than leather? Everything on the watch is matte — the dial, the ceramic bezel and the satin titanium. A polished leather strap would be the only reflective surface on it. Rubber keeps the finish consistent, and at 500m the watch has no reason to avoid water.
Final thoughts
The Pelagos Blue is one of the few dive watches that commits completely to a colour, and it is better for it. A strap is how you decide what to do with that — join it, quiet it down, or set it against something.
Helvetus straps for the Pelagos 42 case are cut for this exact geometry, so there are no gaps at the lugs and no guesswork. Every rubber strap carries a lifetime warranty, shipping is free worldwide with no import costs, and more than 50,000 customers have already made the swap.
