The Tudor Black Bay 39 (Ref. 79660) is one of those watches that quietly nails the “one-watch” brief. It keeps the Black Bay vibe, but trims the whole thing down into a cleaner, more wearable package. No faux-vintage theatrics, no dinner-plate proportions. Just a 39mm case that sits right, looks sharp, and somehow works with a hoodie or a blazer without trying too hard.
And because the watch is so balanced, straps matter more than you’d think. The wrong one can make it feel chunky or oddly dressy. The right one makes it feel like a different watch, in the best way.
Strap size and fit, so you don’t order the wrong one
The Black Bay 39 Ref. 79660 is 39mm and uses a 21mm lug width. That “21” is important because it’s the awkward in-between size people mess up all the time. A 20mm will look pinched. A 22mm will fight the lugs and won’t sit clean.
When you’re on Helvetus product pages, make sure you select “Black Bay 39” as your model option. That’s the setting that matches this watch properly. If you’re buying a strap for a Black Bay 58 or Black Bay 41, the fit rules change, so don’t just click what sounds close.
Best straps for the Tudor Black Bay 39 (Ref. 79660)
If you wear this watch the way most people actually wear it (commuting, travel, weekends, the occasional “I should dress up” night), you want straps that play into the BB39’s clean proportions.
The one I keep coming back to is the Black/Blue LuxLine®. The BB39 has that modern, slightly more refined Black Bay look, and the blue line gives it just enough energy without shouting. It’s also a sneaky good choice if you rotate between black and navy wardrobes. It reads sporty, but it doesn’t look like a gym strap. This is the one that makes the watch feel “current.”
Black/Blue LuxLine Tudor Black Bay Rubber Strap
Then there’s the Navy Blue option, which is basically the strap equivalent of a perfect jacket. If you like the Black Bay look but want it a touch calmer and more classic, navy is the easy win. On a 39mm case, navy keeps the watch looking slim and intentional, especially in daylight. It also makes the steel look cooler, a bit less warm, which suits the BB39’s cleaner design language.
Navy Blue Tudor Black Bay Rubber Strap
And yes, White works ridiculously well on this watch, especially if you lean into the Black Bay 39 as a summer daily. The trick is that the BB39 isn’t overly vintage or oversized, so white doesn’t feel gimmicky. It makes the whole watch pop and turns it into a proper warm-weather piece without changing what you liked about it in the first place. If your usual strap drawer is all black and dark blue, white is the one that actually changes how the watch feels on wrist.
White Tudor Black Bay Rubber Strap
If you want to browse beyond these three, Helvetus has a full range of colors for the Black Bay line here, and it’s honestly the best way to spot a shade you didn’t know you needed:
All Tudor Black Bay Rubber Straps
Buying the right strap from Helvetus, without overthinking it
The Black Bay 39 is strap-friendly, but it’s still picky about fit because of that 21mm lug width and the way the case sits. The simple rule is: choose your color, then double-check you’ve selected Black Bay 39 on the product page before checkout. Once you do that, it stops being a gamble and starts being an upgrade.
If you want the quickest path, start with the Black/Blue LuxLine® if you like a modern sporty edge, go Navy if you want “always looks right,” and go White if you want the BB39 to feel fresh and seasonal.
The part people care about after they’ve worn it
A strap isn’t worth much if you baby it. The reason these work well day-to-day is you’re getting something built for this specific Tudor fit, backed by a lifetime warranty, shipped worldwide without drama, and you’re not hit with surprise import costs at the door. Helvetus has been doing this for a long time now, and there’s a reason more than 30,000 customers worldwide keep coming back: when the fit is right and the watch feels better on wrist, you notice it every single day.
