The W2BB0033 is the two-tone Ballon Bleu in Cartier's current collection – a 36mm steel case framed by an 18k rose gold bezel, with a matching rose gold crown holding the signature blue cabochon. Silver guilloché dial, Roman numerals, blued sword-shaped hands, automatic movement. It's the warmest, most jewelry-like version of the modern Ballon Bleu, and it's exactly the kind of watch that transforms on a leather strap. This guide covers the correct strap size for the W2BB0033 and the options that suit this reference best.
Which Strap Size Fits the W2BB0033?
The Ballon Bleu W2BB0033 takes an 18mm strap. On our product pages, simply select the 18mm / 11mm option – that is the correct fit for the 36mm case.
The Ballon Bleu's fully rounded case and curved lugs mean a generic straight strap never sits properly on this watch. Our straps for the Ballon Bleu are shaped for the case, following its curve so the strap sits flush at the lugs without gaps.
A note on the bracelet: the W2BB0033 comes on Cartier's interchangeable two-tone bracelet, but that doesn't limit you on the strap side. The lugs accept a classic two-piece strap, and every Helvetus strap comes with its own buckle included, so nothing from the original bracelet is needed. You can switch back to the two-tone bracelet whenever you want.
A Quick Look at the W2BB0033
Since its launch in 2007, the Ballon Bleu has become one of the most recognizable watches Cartier makes – the convex case, the crown tucked under its arched guard, the blue cabochon floating like a balloon at three o'clock. The W2BB0033 is the current two-tone expression of that idea: steel for the case, rose gold for the bezel and crown, and a silver guilloché dial that picks up warmth from the gold around it.
What makes this configuration clever is where Cartier put the gold. Because the rose gold sits on the bezel and the crown, the watch keeps its full two-tone identity no matter what's on the lugs. Put it on leather and it doesn't become a different watch – it becomes a dressier version of the same one.
There's a practical side too. On a two-tone piece, the bracelet is the most precious part of the watch and the part that shows wear first – polished rose gold links pick up fine scratches faster than steel. Many owners rotate onto a strap for daily wear precisely to keep that bracelet looking new.
The Best Straps for the Cartier Ballon Bleu W2BB0033
With rose gold in play, warm and soft tones do the heavy lifting here. These are the combinations that work best on this reference.
1. Brown Leather – The Rose Gold Classic
The brown leather strap for the Cartier Ballon Bleu is one of the most popular choices among customers with two-tone models, and it's easy to see why. Brown feeds the warmth of the rose gold instead of competing with it, and against the silver guilloché dial the whole watch takes on a rich, vintage-leaning elegance. If you only add one strap for the W2BB0033, this is the one.
2. Blue Leather – The Watch's Own Accents
Look closely and this watch already tells you its second color: the blued sword hands and the blue cabochon set into the rose gold crown. The blue leather strap picks up both, and the blue-against-rose-gold contrast is a combination Cartier itself has always loved. Refined, but with noticeably more character than a neutral strap.
3. Pink Leather – The Tonal Match
For a softer, more feminine take, the pink leather strap extends the rose gold's blush tone down onto the wrist. The effect is seamless – bezel, crown, and strap reading as one warm palette around the silver dial. A favorite for owners who wear the Ballon Bleu as much as jewelry as a watch.
4. White Leather – The Bright One
The white leather strap does the opposite: it lightens everything. White against rose gold is a fresh, summery pairing that makes the case look even warmer, and it turns the W2BB0033 into a perfect daytime and warm-weather watch. Great with lighter outfits, and a striking change from the bracelet.
Want to explore further? The full strap collection for the Cartier Ballon Bleu also includes black, red, and crocodile-textured options – all available in the same 18mm / 11mm fit for this reference.
Final Thoughts
The W2BB0033 is one of the most versatile watches in Cartier's current lineup, and the strap is what unlocks that versatility – bracelet for everyday, leather for evenings, or the reverse if you'd rather preserve the rose gold links.
Helvetus is one of the leading names in aftermarket straps for luxury watches, and our Ballon Bleu straps are made specifically for this case shape rather than adapted to it. Every order ships free worldwide with no import costs, returns are easy, and more than 50,000 watch owners around the world trust our straps on their timepieces. Your W2BB0033 already has two personalities built in – the right strap lets you use both.
