Tissot PRX 35 mm or 40 mm: which size suits your wrist?
Updated 25 October 2026. By Carlos Iglesias, ArTempo, Maastricht.
The Tissot PRX quartz comes in two sizes, 35 mm and 40 mm. Five millimetres sounds small, but on an integrated bracelet it is the difference between a watch that sits neatly and one with real presence. Here are the numbers and a simple way to decide.
The numbers, from Tissot
| PRX 35 mm quartz | PRX 40 mm quartz | |
|---|---|---|
| Case diameter | 35.00 mm | 40.00 mm |
| Thickness | 9.60 mm | 10.40 mm |
| Weight | 97 g | 130 g |
| Water resistance | 100 m (10 bar) | 100 m (10 bar) |
| Crystal | Sapphire | Sapphire |
| Tissot RRP (Netherlands) | €395 | €395 |
Example references with a blue dial: T137.210.11.041.00 (35 mm) and T137.410.11.041.00 (40 mm). Figures from tissotwatches.com, checked 25 October 2026.
Why the PRX wears larger than its diameter
The PRX has an integrated bracelet: the first links continue the shape of the case instead of starting after separate lugs. On the wrist it reads as one wide, flat shape, so a 40 mm PRX looks bigger than a 40 mm watch with classic lugs.
A rule of thumb
- Wrist under about 16 cm: the 35 mm usually looks balanced.
- Wrist from about 16 to 19 cm: the 40 mm is the classic choice.
- Wrist over 19 cm: the 40 mm.
These are guidelines, not rules. Plenty of people with 16 to 17 cm wrists choose the 35 mm for a vintage look, and some with slimmer wrists like the presence of the 40 mm.
How to measure your wrist
Wrap a strip of paper around your wrist just above the wrist bone, mark where it overlaps and measure it with a ruler. That is the number to compare with the guide above.
See the 40 mm at real size
On our home page you can show the PRX 40 at its real size on your screen: hold a bank card against the screen, match its width with the slider and the watch is drawn 1:1.
What we stock
We stock the PRX 40 mm in four dials, compared in The four PRX dials side by side. If you want a 35 mm, send us the reference and we will quote the price and delivery time.