Col de Bébour

What to Expect from Col de Bébour

Col de Bébour is a Category 2 climb sitting in the volcanic interior of Réunion Island, starting at 853 m elevation and finishing at a summit of 1,494 m. The road covers 10.4 km to deliver 1,003 m of total ascent — a figure that immediately signals this is no gentle tour through the foothills.

The average gradient of 6.18% is deceptively manageable on paper. In practice, that average is being compressed by the presence of a maximum gradient of 37.71% somewhere on the road — one of the steeper single pitches you will encounter on any categorised climb. That number is not a typo. When a climb carries a 37.71% ramp inside a 6.18% average, it means the road is doing something very uneven: long stretches of moderate climbing are punctuated by at least one section that is effectively a wall.

Gradient Breakdown

• Start elevation: 853 m
• Summit elevation: 1,494 m
• Length: 10.4 km
• Total ascent: 1,003 m
• Average gradient: 6.18%
• Maximum gradient: 37.71%

The math alone tells you the climb is front- or back-loaded with easier terrain, because the maximum spike is so far beyond the mean. Riders should treat the moderate sections as active recovery and resist the temptation to push above threshold while the road feels forgiving. That 37%+ ramp will arrive, and it demands something close to full effort regardless of how fresh your legs feel.

Pacing Strategy

For most riders, the governing principle here is FTP-based pacing with a hard ceiling on the easier pitches. Target somewhere in the range of 75–85% of FTP on the moderate gradients. If you don't know your current FTP, use the FTP estimator before attempting this climb at race pace.

When the gradient spikes sharply — and it will — shift your mental model from sustained power output to a short, maximal effort. Trying to spin through a 37% pitch at a steady tempo is not realistic for most gearing setups. Accept that power will spike, cadence will drop, and the goal is to clear the ramp without blowing up for the remaining descent back to the average.

Gearing Notes

The 37.71% maximum gradient is the controlling factor for gearing selection. A compact chainset (50/34 or smaller) paired with an 11-32 or 11-34 cassette is the minimum sensible setup. Riders on standard doubles or with limited cassette range risk being forced out of the saddle and grinding to a near-stop on the steepest pitch.

If you are riding this on a gravel bike or multigear setup already running a wide-range cassette, you are in a better position — but do not assume the lower gears are a crutch for the whole climb. Spinning too easy on the moderate sections wastes time and fails to prepare the legs for what's coming.

Character of the Climb

With over 1,000 m of ascent packed into 10.4 km, Col de Bébour is a genuine mountain effort. The Category 2 designation reflects that honestly. The volcanic terrain of Réunion means road surfaces can vary, ambient humidity is typically high, and cooling from wind is not always available in the sheltered interior sections. Factor heat and humidity into your nutrition and hydration planning — this is not an Alpine climb where temperature drops predictably with altitude.

For reference on how Bébour compares to other Category 2 climbs in terms of gradient profile, see other climb profiles on Neverchill.