Some watches change character depending on how you wear them. The Rolex GMT-Master II 126710BLNR is one of the best examples. On the Oyster bracelet, it’s the classic “Batman” tool watch. On Jubilee, it becomes the slightly dressier “Batgirl.” Same watch, same reference, completely different mood.
That black-and-blue bezel sits right in the sweet spot. Sporty, but not loud. Recognizable, but not flashy. It’s the GMT that works everywhere, which is exactly why swapping the bracelet for rubber makes so much sense, especially if you actually wear the watch day to day.
Getting the fit right (this matters more than color)
Both the Batman and the Batgirl share the same specs, so there’s no difference in strap sizing between the two.
You’re looking at:
-
40mm case
-
20mm lug width
When choosing a strap, the only thing you need to focus on is selecting 20mm for the GMT-Master II 40mm. Once that’s locked in, you’re free to choose the style and color without worrying about awkward gaps or poor case integration.
If you’ve ever seen a GMT on a strap that doesn’t quite sit right, you know how quickly it ruins the look. A proper fitted strap should feel like it belongs there, not like a temporary workaround.
Rubber straps that work for both Batman and Batgirl
The beauty of the 126710BLNR is how adaptable it is. The same strap can feel sportier or cleaner depending on whether you’re coming from an Oyster or Jubilee mindset.
Black with Blue LuxLine®
Black/Blue LuxLine® Strap for GMT Master II
This is the natural bridge between Batman and Batgirl. The black base keeps everything grounded, while the blue line picks up the bezel color without stealing attention.
On a Batman-style setup, it reinforces the tool-watch vibe. On a Batgirl, it tones things down just enough to keep the watch elegant but more relaxed. If you want one strap that works in almost every situation, this is the easy recommendation.
Solid Blue
Blue rubber leans more casual, and that’s not a bad thing. It pulls the blue half of the bezel forward and gives the watch a lighter, more playful feel.
This one really shines on the Batgirl crowd who like the Jubilee look but want something less shiny for travel, summer wear, or long days outside. It feels intentional, not experimental, which is harder to pull off than people think.
Classic Black
Black rubber is the reset button. It strips the watch back to its essentials and turns both Batman and Batgirl into a pure, modern GMT.
If you want your 126710BLNR to feel tougher, slimmer on wrist, and slightly more understated, black is the move. It also happens to be the most versatile if your GMT rotates between office wear and weekends without much warning.
Choosing from the full Helvetus GMT-Master II range
If you want to see all available colors and styles in one place, the GMT-Master II strap collection is the easiest way to browse:
All GMT Master II Rubber Straps
That’s also where you can decide between deployant and pin buckle versions. Deployant is great if you put your watch on and off multiple times a day and want a more refined feel. Pin buckle keeps things simple and traditional, especially if you prefer a lighter setup.
All options are designed specifically around the GMT-Master II case profile, which is why the watch still looks “right” even when you move away from the factory bracelet.
Final thoughts from someone who actually wears these watches
The Rolex GMT-Master II 126710BLNR works because it doesn’t force you into one identity. Batman, Batgirl, bracelet, rubber, dressed up or worn hard, it all feels natural.
A good rubber strap just expands that flexibility. With Helvetus, you’re getting a strap designed for a precise fit on this GMT-Master II reference, backed by a lifetime warranty, free worldwide shipping, and no import costs. And when over 30,000 watches worldwide are already wearing them, that trust usually comes from comfort and fit, not marketing.
