Ballon Bleu de Cartier vs Tank
Cartier Ballon de Cartier WSBB0030 vs Cartier Tank WSTA0108, compared on the specs each brand publishes.
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The short answer
Round against rectangular: two Cartier icons on Cartier's specs.
- Case size: the Cartier Ballon de Cartier WSBB0030 is 7.5 mm larger (33 mm vs 25.5 mm).
- Thickness: the Cartier Ballon de Cartier WSBB0030 is 3.9 mm thicker (10.5 mm vs 6.6 mm).
- Price: the Cartier Tank WSTA0108 lists for $2,500 less in the US ($4,100 vs $6,600).
- Movement: Cartier Ballon de Cartier WSBB0030 has Automatic; Cartier Tank WSTA0108 has Quartz.
Side-by-side specs
| Spec | Cartier Ballon de Cartier WSBB0030 | Cartier Tank WSTA0108 |
|---|---|---|
| Case diameter | 33 mm | 25.5 mm |
| Thickness | 10.5 mm | 6.6 mm |
| Movement | Automatic | Quartz |
| Water resistance | 30 m | 30 m |
| Crystal | Sapphire | Not stated |
| Case material | Stainless steel | Stainless steel |
| Ships on | Alligator leather strap | Alligator leather strap |
| US list price | $6,600 (US list) | $4,100 (US list) |
| Dial | Silver guilloché opaline | Black lacquered |
| Status | In production | In production |
| Suits wrists of about our sizing guide | 13.0–14.9 cm | 9.8–11.7 cm |
Specs summarised in our own words from the brand's product pages: WSBB0030 source (checked 3 Nov 2026) WSTA0108 source (checked 3 Nov 2026). "Not published" means the brand page we checked doesn't list it, so we leave it blank rather than guess.
Wrist fit
Lug-to-lug decides overhang more than diameter does. Enter your wrist to see how each one should wear.
- Cartier Ballon de Cartier WSBB0030 –
- Cartier Tank WSTA0108 –
Same rule of thumb as Watch Finder: case diameter of about 23.5% of your wrist circumference (−2 mm to +2.5 mm), and lug-to-lug no longer than about 29% of it plus 1 mm. A guide, not a rule; flat or round wrists differ.
Which should you buy?
It is the more compact case on paper (25.5 mm across). Our sizing guide puts it at about 9.8–11.7 cm.
It has the lower US list price, $4,100, a $2,500 difference.
It is the slimmer case at 6.6 mm.
Prices and where to buy
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More: All Cartier Ballon de Cartier references · All Cartier Tank references.
Questions
Which is bigger, the Cartier Ballon de Cartier WSBB0030 or the Cartier Tank WSTA0108?
Per the brands, the Cartier Ballon de Cartier WSBB0030 is 33 mm across and the Cartier Tank WSTA0108 is 25.5 mm.
Which is cheaper?
The Cartier Tank WSTA0108, at a US list price of $4,100 vs $6,600 when we checked.
Which is more water-resistant?
Cartier Ballon de Cartier WSBB0030: 30 m. Cartier Tank WSTA0108: 30 m.
Have you tested these watches?
No. This comparison uses brand-published specs and our own analysis of them, not hands-on testing.
Watch.co is independent and not affiliated with any brand. We haven't handled these watches for this page: everything here comes from brand-published specs and our own analysis. Brand names are used only to identify products.