Col du Granier

What to Expect on the Col du Granier

The Col du Granier is a category 1 climb in France that earns its classification honestly. Starting at 267 m elevation, it rises to a summit of 1,131 m over 10.5 km, delivering 864 m of net elevation gain and 978 m of total ascent. That gap between net and total ascent tells you something immediately: this is not a smooth ramp. The road undulates, and any relief sections are brief enough that the accumulated climbing exceeds the straight-line altitude difference by over 100 m.

The average gradient of 8.2% is relentless by any measure. Hold that figure in mind before you start, not because the climb rides at a consistent 8.2% — it absolutely does not — but because the average gets pulled down by whatever flatter passages exist. That means the sustained pitches are considerably steeper than 8.2%, and the maximum gradient of 27.8% represents a near-vertical shock somewhere on the road.

How the Gradient Unfolds

At 8.2% average across 10.5 km, you are looking at a climb that demands sustained aerobic output from the first kilometer. There is no gentle warmup ramp to find your legs. Budget for the full distance to be hard.

The 27.8% maximum gradient is the defining feature of the upper profile. A pitch of that severity is not something you power through — it is something you survive. At 27.8%, forward momentum stalls fast if you choose the wrong gear or attack it with accumulated fatigue. Riders who have been pushing near threshold earlier on the climb will pay heavily when this section arrives.

Key gradient realities:

• Average gradient of 8.2% means threshold or sub-threshold effort for almost the entire ascent
• Maximum of 27.8% requires either a very low gear ratio or a short, controlled burst — ideally both
• 978 m total ascent versus 864 m net gain suggests at least one or two gradient fluctuations that reset your legs briefly but add cumulative work

Pacing Notes

The fundamental mistake on a climb averaging 8.2% over 10.5 km is treating the early kilometers as easy. They are not. Starting even 5–10 watts over your sustainable power for this duration will unravel you before the steepest pitches.

Target a pace you can hold at roughly 85–92% of your FTP for the opening two-thirds of the climb. The 27.8% ramp is not a place to discover you are already in your smallest gear. If you need to estimate your sustainable power before attempting this climb, the FTP estimator can give you a working baseline.

Mental checkpoints:

• First third: Controlled, breathing comfortably, no hero moves
• Mid-climb: The gradient will test you — resist the urge to soft-pedal through any easier sections, use them to recover fractionally rather than to accelerate
• Final third: The maximum gradient section is here or close. Shift early, not in crisis

Gearing

For a climb that hits 27.8% at some point, a compact chainset (50/34) paired with at least an 11-32 cassette is the minimum sensible setup for most riders. If you are carrying any fatigue from earlier in a ride or racing a longer route with this climb embedded in it, a 34-tooth rear sprocket or larger is not an indulgence — it is practical. The 864 m of gain accumulated at this average gradient is a significant muscular load before you even reach the steepest pitch.

For context on how climbs of this category compare, see the Col du Granier climb page alongside other category 1 climbs in the Neverchill database.