Col de Crozet

What to Expect on Col de Crozet

Col de Crozet is a Category 1 climb in France measuring 13.1 km from base to summit. It delivers 1,024 m of net elevation gain and a total ascent of 1,282 m — the difference between those two figures signals that the road is not a clean straight shot upward. Expect at least some undulation or false flat recovery built into the profile, which can lull you into pushing too hard before the real ramps arrive.

The average gradient sits at 7.79%, which is already firmly in the demanding tier for a climb of this length. Sustain that for 13 km and you are looking at a serious aerobic effort even before the road kicks up toward its maximum.

The Maximum Gradient: 31.82%

That number is not a typo. At 31.82%, the steepest ramp on Col de Crozet is among the most extreme gradients you will encounter on a paved road. For context, most cyclists consider anything above 20% a wall. At 31.82%, forward momentum nearly stops regardless of fitness level. The practical consequences:

• Gearing: If you are riding a standard road double chainset, you may run out of gears entirely on this ramp. A compact 34/34 or a 1x setup with a wide-range cassette (32t or larger) is worth considering seriously before you arrive at the foot of the climb.
• Body position: At this gradient, weight shifts dramatically to the rear wheel. Standing and pulling hard on the bars to keep the front wheel grounded is normal technique, but it burns matches quickly.
• Momentum: Do not arrive at the steep ramp already deep in the red. Whatever is above threshold going into a 30%+ pitch will likely cause a stall or a foot-down moment.

Pacing the Lower and Middle Sections

With 13.1 km to cover and an average of 7.79%, the climb rewards a disciplined start. The gap between the average gradient and the maximum is enormous — 24 percentage points — which means the gradient distribution is highly uneven. There are almost certainly sections well below average to compensate for the extreme upper ramps.

Use the easier lower gradients to settle into a sustainable power output relative to your FTP. Riding the gentler pitches at 75–80% of FTP keeps reserves in the tank for what is coming. If you are unsure of your FTP heading into a climb like this, use the FTP estimator before planning a target wattage.

Key Pacing Principles

• Treat the average gradient as a ceiling, not a target: On the easier sections, ride below 7.79% effort-equivalent to bank energy.
• Identify the steep ramps early: If you have GPS data loaded, mark the location of the maximum gradient section so you are not caught by surprise.
• Cadence over torque: On the steep pitches, a higher cadence in your lowest gear protects the knees and keeps power output more consistent than grinding a big gear.

The Numbers in Summary

Final Assessment

Col de Crozet is not a climb where brute power alone gets you to the top cleanly. The combination of sustained length, a high average gradient, and an extreme maximum ramp punishes riders who go out too hard or arrive with the wrong gearing. Respect the category rating, plan your gear selection in advance, and treat every easier pitch as recovery rather than an invitation to accelerate.