Tissot PRX 40 mm real measurements: lug to lug, thickness and weight
Updated 5 November 2026. By Carlos Iglesias, ArTempo, Maastricht.
The PRX 40 mm wears larger than 40 mm suggests, and its lug-to-lug figure causes more confusion than any other number. Here is what is confirmed, what is disputed, and how to check it yourself.
The confirmed figures
| Measurement | PRX 40 mm quartz |
|---|---|
| Case diameter | 40.00 mm |
| Thickness | 10.40 mm |
| Weight | 130 g |
| Water resistance | 100 m (10 bar) |
Figures from tissotwatches.com.
Why lug-to-lug figures disagree
On most watches, lug to lug is the length from one end of the case to the other. The PRX has no separate lugs, because its first bracelet links continue the case. So you will find very different numbers:
- About 39.5 mm: the case length on some spec sheets, without the first links.
- About 45 mm: a figure quoted when the watch was announced, according to Monochrome.
- About 51 mm: what hands-on reviewers such as Time+Tide measure, counting the fixed first link on each side.
The 51 mm figure is the one to use for fit, because that fixed part does not bend around your wrist.
Check it on your wrist
- Cut a strip of paper 51 mm long.
- Lay it along the top of your wrist, where you wear a watch.
- Look in a mirror. If the ends stay on the flat top of your wrist, the PRX 40 mm should sit well. If they reach past the edges, it will look large.
You can also show the watch at real size on your screen on our home page.
If it is too big
The PRX also comes in 35 mm. We compare them in PRX 35 mm or 40 mm, and we can quote you a 35 mm on request.