The WSTA0060 is the small SolarBeat – Cartier's sun-powered Tank in its most classic proportions. A slim steel case of 29.5 x 22 mm and just 6.6 mm thick, a silvered dial with Roman numerals and blued sword-shaped hands, the blue spinel cabochon in the beaded crown, and underneath it all a photovoltaic SolarBeat movement that quietly charges through the dial itself. From the factory it comes on a black strap made without animal materials, closed with a simple pin buckle. And that strap is exactly why you're here: on a watch built to run for years on light alone, the strap is the one part that ages. This guide covers the correct strap size for the WSTA0060 and the best options to renew or restyle it.
Which Strap Size Fits the WSTA0060?
The Tank Must SolarBeat WSTA0060 takes a 16mm strap. On our product pages, simply select the 16mm option – that is the correct fit for the small 29.5 x 22 mm case.
Quick routing if you're not sure which Tank you own: the Large Tank Must models (including the Large SolarBeat) take 19mm, and the XL automatic takes 23mm. The small model covered here is the slimmest of the three – if your case measures 22 mm across, 16mm is your size.
The strap mounts on standard spring bars, and every Helvetus strap comes with its own buckle included, so nothing needs to be reused from the original. And if you happen to own a Cartier folding clasp, our Tank straps are compatible with it as well.
A Quick Look at the WSTA0060
The Tank has barely changed its face since 1917 – the brancards, the Roman numerals, the sapphire-blue accent at the crown. What changed in this generation is everything you can't see: the SolarBeat movement drinks in daylight through the dial and simply keeps going, no winding, no battery anxiety. In the small case, the result is one of the easiest luxury watches in the world to live with – light, thin, elegant, and always running. It's no surprise this reference has become one of the most gifted Cartier watches of its generation.
There's one honest truth about it, though. Unlike a Santos or a Ballon Bleu, this Tank has no bracelet to fall back on – it spends its entire life on a strap. That makes the strap both the most personal part of the watch and its only real wearing part. The original non-animal strap is a thoughtful piece of the watch's story, and when the day comes to renew it, you have two good options: match the factory look, or take the opportunity to make the watch entirely yours.
Cartier itself would approve of the second option. When the Must line first appeared in the late 1970s, it was famous precisely for its colored leather straps – the Tank as a canvas, not a uniform.
The Best Straps for the Cartier Tank Must SolarBeat WSTA0060
Slim rectangular case, silvered dial, blued hands – the small Tank wears color better than almost any watch. These are the choices that suit the WSTA0060 best.
1. Red Leather – The Must Tradition
If one color belongs on a Tank Must, it's red. The red leather strap for the Cartier Tank picks up the color Cartier made its own and revives the spirit of the original Must era, when colored straps were the whole point. Against the silvered dial and steel case, red turns the quiet little SolarBeat into a genuine signature piece – and it's a favorite choice among Tank owners for exactly that reason.
2. Black Grained Leather – The Factory Look, Upgraded
Prefer the watch exactly as Cartier styled it? The black grained leather strap mirrors the texture and color of the original strap in genuine grained calfskin. Nothing about the watch's character changes – it simply gets a fresh strap with the depth and feel of real leather. The straightforward replacement choice, and the one most owners of this reference start with.
3. Pink Leather – The Soft One
The small Tank is a gift watch as much as anything, and the pink leather strap leans into that beautifully. The gentle blush tone softens the steel, flatters the slim case, and gives the WSTA0060 a warm, personal character for everyday wear. Lovely on its own, even better stacked with jewelry.
4. Blue Leather – The Watch's Own Accents
Blued sword hands and a blue cabochon in the crown – this Tank has always carried its second color with it. The blue leather strap draws it out across the whole watch, deepening the dial's elegance while staying completely office-appropriate. The refined pick for owners who want change without a statement.
Looking for something else? The full strap collection for the Cartier Tank also includes brown, crocodile-textured options, and more – all available in the 16mm fit for this reference.
Final Thoughts
A movement that runs on light deserves a strap that keeps up with your life. Renew the WSTA0060 when its original strap has done its duty, or give it a second personality for the seasons – either way, the watch underneath will just keep going.
Helvetus is one of the leading names in aftermarket straps for luxury watches, and our Tank straps are cut for these slim, rectangular cases rather than adapted to them. 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. The sun powers your Tank – let the strap express it.
