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Pierre racing, yellow hat and patterned shirt
Who's behind Cailloux

Pierre

46, a runner from northern France, heavy-goods build.
I finish my races. Late, but I finish them.

A truck, not a race car

In trail running there are the runners built like race cars: light, twitchy, mounted on springs, able to accelerate up a rise at the hour when everyone else is negotiating with themselves.

And then there is me. I am a truck. The chassis is solid, the bodywork has volume, and do not count on me to take a tight corner. On the other hand, I roll. For a long time. All day if that is what it takes.

The advantage of a truck is the fuel tank. I have never had a nutrition problem in a race: no bonk, no nausea, none of that tragic moment when one gel too many decides to turn back. I eat, it goes down, I set off again.

The drawback of a truck is top speed. Let us say I do not frighten the clock. Not the clock, and not anybody else either.

Technical specification
Age
46
Region
Northern France
Engine size
Heavy goods
Favourite distance
40 to 100 km
Range
Excellent
Top speed
Theoretical
Margin on the cut-off
Symbolic

My speciality: the cut-off time

I have a talent nobody envies: I always make the cut-offs. Just before. Really just before.

Where others collect podiums, I hold a season ticket to suspense. The volunteers who are starting to fold the tables away know me well. There is always that moment when somebody looks up and says “oh, there's still one more”. That is me. It is always me.

If Cailloux has a cut-off alert, that is not a feature. It is a personal need.

What I run

Between 40 and 100 km. That is where I belong: long enough that speed stops being the point, reasonable enough to go home and sleep in my own bed.

The 100, I have not done yet. It should happen. I have started telling people around me, which is, as everyone knows, the first irreversible step.

By day, I work in an opera house

On the stage. In practice: in the dark and in silence, I move scenery that weighs as much as a small car, while somebody sings a few metres away.

It is excellent cross-training, and it explains part of the build: you do not do this job mounted on springs.

Why tell you all this? Because Cailloux was not designed for the runners at the front. It was designed by somebody who runs at the back, who knows the dread of the cut-off, and who knows exactly how a support crew feels after waiting 2 hours. 🪨

The rest of the story

How a laminated sheet of paper in a jacket pocket became a live tracking app.

📖 Read how the project started