
The Rolex Explorer is one of those rare timepieces that manages to blend history, adventure, and sheer practicality into a single, understated package. Born in the 1950s and famously tied to the golden age of mountaineering, it’s become a staple of Rolex’s lineup for good reason.
The Explorer isn’t oversized like some of its sporty siblings or overly dressy that it feels too flashy, and that’s precisely its charm. It’s a go-anywhere, do-anything watch that feels just as at home scaling peaks as it does slipping under a shirt cuff at a dinner party.
For decades, the Explorer has epitomized the idea of a “tool watch”, something built to be functional first, stylish second. And while the design has remained remarkably consistent over the years, Rolex has introduced subtle changes that make choosing the right model surprisingly tricky.
Case in point: the Explorer 36 and Explorer 40. On the surface, they might seem nearly identical, but the differences are there, and they matter, whether it’s about fit, proportions, or the case materials on offer.
A Bit of Background on the Rolex Explorer
The Rolex Explorer has one of the coolest origin stories in the world of watches. Back in 1953, Rolex supplied their Oyster Perpetual watches to the British Mount Everest Expedition, led by John Hunt.
And these weren’t just marketing props. Rolex genuinely wanted to see how their watches held up in extreme conditions. So, on May 29, 1953, Edmund Hillary and Tenzing Norgay made history by reaching the summit, and with them, the Rolex Explorer became part of the story.
By the end of the year, Rolex introduced the Explorer as a tribute to that achievement. It wasn’t flashy or ornamental but built to be practical, robust, and readable.
The watch was designed to handle just about anything, with a waterproof Oyster case, a self-winding movement, and a simple yet effective black dial with luminous markers. It was a watch, not for showing off, but for getting the job done, whether that job was conquering Everest or navigating general everyday adventures.
Over the years, the Explorer has remained consistent, which is part of its appeal. It’s always been made with stainless steel, always featured that iconic 3-6-9 dial, and has always been focused on function over form.
References like the 1016, which had a three-decade run starting in the late ‘50s, became benchmarks for what a tool watch should be: tough, reliable, and timeless.
The Explorer has evolved gradually. You got sapphire crystal with the ref. 14270 in the ‘80s, a move to modern movements with the ref. 114270 in the early 2000s, and then, in 2010, the size jumped to 39mm with the ref. 214270.
That last change was divisive at first as some felt the proportions were off, especially with the short hands on the earlier versions. Rolex fixed it in 2016 with longer hands and better lume, but the jump to a larger case showed how even the Explorer couldn’t escape the industry’s trend toward bigger watches.
And of course, that was made even more clear with the launch of the Rolex Explorer 40 in 2023, which inevitably replaced the slightly smaller 39mm reference.
What’s amazing about the Explorer is how it’s managed to stay relevant for so long without losing its essence.
Rolex doesn’t mess around with this watch; it’s not like the Submariner or GMT-Master, which come in a dozen variations. The Explorer is straightforward and singular, and that’s what makes it so compelling. It’s a watch that doesn’t need hundreds of variations to stand out; it’s brilliant as is.
But that said, although the Rolex Explorer collection is limited in its options, there are still options. Two are the Explorer 36 and the Explorer 40. These two references have a lot in common, but they also offer subtle yet significant differences in size, proportions, and case materials. Choosing between them might seem straightforward, but the details are what make all the difference.
The Rolex Explorer 36

The Rolex Explorer 36 has a kind of quiet confidence about it. At 36mm, it’s not trying to be big or bold—it just knows what it is. And that’s part of what makes it so special.
This is the size that Rolex had in mind when the Explorer first launched back in 1953, celebrating the legendary Everest ascent by Hillary and Norgay. It’s not oversized, not undersized, just right for what the Explorer was designed to be: a reliable, legible tool watch for adventures.
When Rolex reintroduced the 36mm Explorer in 2021 with the ref. 124270, it felt like coming home. After years of experimenting with larger case sizes, they went back to the dimensions that made the Explorer an icon in the first place.
They also packed the model with some new technology too. The Caliber 3230 remains one of Rolex’s newer in-house movements, offering a 70-hour power reserve, enhanced accuracy, and magnetic resistance.
The 36mm model is exactly what you’d expect from an Explorer. It’s clean and purposeful and comes with a black lacquered dial, luminous hands, and those unmistakable 3, 6, and 9 numerals. The lume is Rolex’s proprietary Chromalight, which glows blue in the dark and stays visible for hours.
One of the most standout differences of the Explorer 36 compared to the Explorer 40 is reference 124273 which delivers the tool watch with a two-toned construction.
It pairs the steel case with a Rolesor gold bezel, winding crown and centre bracelet links. It adds a little bit of something different to the Explorer collection, still delivering a rugged tool watch but one with a more luxurious and elegant finish.
The Rolex Explorer 40

The Rolex Explorer 40 is basically the bigger sibling of the Explorer 36. We’ve already discussed the Explorer 36 above so truthfully, you already know most of what the 40 has to offer because, aside from its size, it’s almost identical.
Let’s start with what’s the same, which is, honestly, just about everything. Like the 36, the Explorer 40 has a durable Oystersteel case made from a solid block of corrosion-resistant steel, designed to take whatever life throws at it.
It’s waterproof to 100 meters thanks to the screw-down case back and the Twinlock crown, and its sapphire crystal keeps the black lacquered dial perfectly protected.
That dial also has the same clean, purposeful design as the 36 with those iconic 3, 6, and 9 numerals, the inverted triangle at 12 o’clock, and baton-style hour markers, all coated in Rolex’s Chromalight lume for excellent readability in the dark.
Inside, it’s powered by the same movement, the Caliber 3230, which has become a Rolex staple. It’s a workhorse of an automatic movement, featuring the brand’s patented Chronergy escapement for efficiency, a Parachrom hairspring for magnetic resistance, and a 70-hour power reserve.
You’re getting the same precision and reliability you’d expect from a Rolex, tested to a rate of +2to -2 seconds per day which is well beyond the usual chronometer standards.
But here’s where the Explorer 40 takes its own path: the size. At 40mm wide and 11.6mm tall, it’s noticeably larger than the 36mm Explorer. And while the thickness is nearly identical—just 0.1mm taller—the extra width makes a real difference on the wrist. It has more presence, feeling a bit bolder without losing the Explorer’s signature understatement. If you’ve got a larger wrist or just prefer something with a bit more heft, the Explorer 40 will probably feel more balanced for you.
One other key difference is that unlike the Explorer 36, which is also available in a two-tone Rolesor gold and steel version, the Explorer 40 sticks exclusively to stainless steel, or at least for now. That simplicity keeps it in line with the Explorer’s rugged, no-frills heritage, though it might leave some wishing for more options.
Rolex Explorer 36 vs 40 – How to Choose
When it comes to choosing between the Rolex Explorer 36 and the Explorer 40, the key differences boil down to size and metal options. The two watches are nearly identical in design and features, so the choice really depends on how you want the watch to wear and what kind of vibe you’re going for.
The Size
The Explorer 36, as the name suggests, measures 36mm across, while the Explorer 40 bumps that up to 40mm. The difference might not sound massive on paper, but it’s very noticeable on the wrist. The 36mm size is the classic Explorer size, matching the proportions of the original 1953 model that accompanied mountaineers to the summit of Everest.
It has that vintage-inspired feel and is compact enough to work for a wide range of wrist sizes. In fact, it’s one of those rare Rolex watches that easily suits both men and women.
The Explorer 40, on the other hand, is a bit more of a modern take on the tool watch with its larger size. It measures to 40mm wide and 11.6mm thick so it has a much bigger presence and will better suit larger wrists.
If you’ve got a bigger frame or simply prefer watches that feel more substantial, the 40mm will likely feel better balanced. But if your wrist is on the smaller side, the 40 might come across as oversized and thus feel a little less versatile.
The Metal Options
As for design options, the Rolex Explorer collection is, and probably always will be, a little restrictive. It’s part of the collection’s charm. But for those that want at least a little bit of choice, the Rolex Explorer 36 is available in two versions: classic stainless steel (what Rolex calls Oystersteel) or a two-tone mix of steel and yellow gold (which Rolex refers to as “Rolesor”).
That Rolesor version adds an 18k yellow gold bezel, crown, and centre bracelet links, giving the Explorer a dressier, more luxurious feel. The Explorer 40, however, is currently only offered in stainless steel. That keeps it in line with the Explorer’s rugged, tool-watch roots and gives it a cleaner, sportier look.
Which Rolex Explorer Is Right For You?
If you’re leaning toward the Rolex Explorer 36, you’re probably someone who values tradition and versatility. Its smaller size and two-tone Rolesor option make it a great pick for those who want something that can easily transition from casual to dressy, and it’s a natural fit for smaller or average-sized wrists.
Plus, that 36mm size works equally well for both men and women, making it one of Rolex’s best unisex options.
The Explorer 40, on the other hand, is for those who like their watches a little bigger and bolder. It’s a sportier choice that’s perfect for larger wrists or for anyone who wants a watch that feels a bit more modern. Without the gold accents, it leans more utilitarian, making it ideal for someone who’s after the pure Explorer DNA without any frills.
Conclusion
At the end of the day, choosing between the Rolex Explorer 36 and Explorer 40 is less about one being better than the other and more about finding the one that feels right for you.
Both watches deliver the same legendary craftsmanship, robust Oystersteel construction, and timeless Explorer design. They’re even powered by the same reliable Caliber 3230 movement and offer that clean, versatile aesthetic that’s been a hallmark of the Explorer since its debut in 1953.
The decision really comes down to size and style. If you want a watch that feels more traditional, with compact proportions that work equally well on smaller wrists or for those looking for a subtle, dressier option, the 36mm model is hard to beat.
If, on the other hand, you prefer something with a bit more wrist presence, a modern edge, and a sportier vibe, the Explorer 40 offers all of that without compromising the Explorer’s original stainless steel heritage.
Ultimately, whichever model you choose, you’re getting a watch that’s brilliantly engineered for the everyday. It’s built to withstand a lifetime of adventures, whether that’s scaling mountains or navigating the everyday. You really can’t go wrong.