Col de Telmet cycling climb profile
Col de Telmet is a category 2 climb that rewards patience more than aggression. On paper, the key number is the 19.7 km length. The average gradient is only 3.56%, but that can be misleading if it tempts you into riding it like a rolling approach road. The climb starts at 835 m and reaches 1534 m, giving a listed net elevation gain of 699 m, so the work accumulates steadily even when the road does not feel severe.
The maximum gradient is 8.62%, which changes how the climb should be read. A climb of this length with a modest average and a noticeably steeper maximum is rarely about one continuous hard grind. The numbers point to a profile where easier gradients are balanced by sharper sections. That means the danger is not one brutal wall, but repeated small overextensions on the steeper ramps, followed by a gradual loss of control over the final part of the ascent.
How the gradient unfolds
The available profile data does not give split-by-split gradient sections, so the cleanest read is from the full-climb relationship between distance, average gradient, and maximum gradient.
Across 19.7 km, 3.56% is a tempo-climb average. It should allow a smooth seated rhythm for most trained riders, especially if the road is ridden conservatively early. But the 8.62% maximum tells you the climb is not uniformly gentle. There are steeper moments where torque demand rises, cadence can fall, and pacing mistakes become expensive.
That combination makes Col de Telmet a climb to ride by effort rather than speed. Speed will fluctuate naturally as the gradient shifts. Chasing a constant pace is the wrong target because the climb’s average is pulled down by easier terrain. The smarter approach is to keep power or perceived exertion stable on the shallow sections, then cap the effort when the road kicks up.
Pacing strategy
Treat the first part of the climb as a controlled entry, not a place to bank time. At 19.7 km, the duration is long enough that early surges above sustainable climbing effort will come back later. If you know your /glossary/ftp, the main target should be a pressure you can repeat without needing long recoveries after each steeper ramp.
The decisive skill here is restraint on anything approaching the maximum gradient. An 8.62% pitch is not extreme in isolation, but after steady climbing it can force a rider into low-cadence, high-torque work. If that happens too often, the climb stops being aerobic and starts becoming a sequence of costly accelerations.
A useful mental model:
- Ride the moderate gradients with a light, repeatable rhythm.
- Let speed drop on the steeper ramps instead of forcing the same speed.
- Avoid standing accelerations unless they are brief and controlled.
- Save the strongest effort for the final kilometres, once the remaining distance is certain.
Gearing notes
Because the average gradient is moderate, Col de Telmet does not require extreme climbing gearing for every rider. The issue is the range between the 3.56% average and the 8.62% maximum. You want a low enough gear to stay seated and keep cadence from collapsing when the road reaches its steepest listed pitches.
For a strong rider, standard climbing gearing may be enough if pacing is disciplined. For heavier riders, less experienced climbers, or anyone riding after accumulated fatigue, an easier bailout gear is the safer choice. The goal is not just to survive the steepest ramp. It is to keep the whole 19.7 km climb under control, because this is exactly the kind of profile where a moderate average can hide a harder physiological cost.