Collada de Roques Blanques cycling climb profile
Collada de Roques Blanques is an HC climb in France that is defined less by one headline ramp than by the scale of the whole effort. It runs for 35.1 km from 272 m to 2298 m, gaining 2026 m net on the way to the summit. That is the central fact of the ride: this is not a short test of climbing sharpness, but a long, sustained aerobic commitment.
The average gradient is 5.76 percent, which can make the climb look more manageable than it will feel once the distance starts to compound. A climb this long at that average requires patience. The risk is not being unable to handle the normal gradient. The risk is riding the early slopes as if the number is harmless, then arriving deep into the ascent without enough reserve for the steeper ground.
How the gradient unfolds
The profile numbers point to a climb that keeps gaining height with very little meaningful downhill reset. Total ascent is 2054 m, while net elevation gain is 2026 m, so almost all of the vertical work is directed toward the summit rather than being diluted by repeated descents.
That makes the pacing problem fairly simple, but not easy. The climb asks for a repeatable rhythm over a very long duration. The average gradient suggests there should be extended sections where seated climbing is realistic, but the maximum gradient of 26.8 percent changes the gearing equation completely. Somewhere on the climb, the road gets brutally steep. The available data does not identify where that pitch arrives, which matters tactically: you cannot assume it comes when you are fresh.
This is the type of climb where the steepest section is not just a local obstacle. It affects the whole pacing plan. If you ride too close to your limit on the more regular gradients, the maximum pitch becomes a forced over-threshold effort rather than a controlled acceleration.
Pacing and gearing notes
Start conservatively. If riding with power, this is a climb to anchor below /glossary/ftp early and let the duration do the work. The long length and high total gain mean the cost of small surges will accumulate.
Gearing should be chosen for the maximum gradient, not the average. A setup that feels comfortable at 5.76 percent may be exposed badly on the 26.8 percent section. Prioritize a low gear that lets you keep turning the pedals under control, especially if you want to stay seated and avoid burning matches through high-torque grinding.
The best way to ride Collada de Roques Blanques is to treat the opening as preparation for the unknown steepest point. Keep pressure smooth, avoid chasing speed on the easier gradients, and leave enough margin that the final elevation gain can be ridden rather than survived.