This is a challenging climb.
The mean slope is considerable (8.7%)
but two parts, namely from 2.5 to 4 km
and a stretch of 3.5 km just before the end exceed 10% on average.
This fact is aggrevated by small-scale variations
that do not show up in the 500 meter averages of the profile shown here.
The beginning is where the D53 splits from the D900b, just east of Remollon.
At first the road crosses farmed land
and then starts to be really steep when it passes through the village of Théus.
After Théus the slope declines
but the last 4 kilometers through forests and some meadows,
starting near the parking lot from where the Demoisselles coiffées can be viewed, are killing.
After the summit there is a short descend
to a location with a superb view on the Lac de Serre-Ponçon and high summits behind it.
The road is narrow but in a reasonably good condition.
I met no other race bikers.