Izpegi Pass

What to Expect on Izpegi Pass

Izpegi Pass is a Category 1 climb tucked into the French Basque Country. At 5.1 km with an average gradient of 9.88% and a net elevation gain of 500 m, it is short enough to feel like it should be manageable — and brutal enough to punish anyone who treats it that way.

The total ascent registered over the course is 661 m, which is meaningfully higher than the net gain of 500 m. That discrepancy signals the road is not a clean, uninterrupted ramp. There are micro-undulations and directional shifts baked in, which means the legs never get a genuine rest, but also that you can't simply lock into one effort level and hold it.

Gradient Profile

The headline number here is the maximum gradient: 37.04%. That is not a misprint. Somewhere on this 5.1 km road, the tarmac tips up to a pitch that most riders can only manage out of the saddle in the easiest gear available, and even then only if momentum and cadence are carefully managed going in.

With an average of 9.88%, the climb sits well above what most riders would consider a sustained hard effort from base to summit. For context on how average gradient translates to physiological demand, see the FTP glossary.

Key gradient characteristics:

• Average gradient: 9.88% — relentlessly steep throughout
• Maximum gradient: 37.04% — a severe ramp requiring specific preparation
• Total ascent: 661 m over 5.1 km, indicating the road kicks and rolls rather than ascending smoothly
• Net elevation gain: 500 m from start (158 m) to summit (658 m)

Pacing Strategy

The gap between total ascent (661 m) and net gain (500 m) tells you the climb does not deliver its difficulty in one clean block. Expect the hardest ramps to appear mid-climb or later, where fatigue compounds the gradient.

Start conservatively. The average of 9.88% means there is no flat or easy lower section to use as a warm-up. If you open at threshold, the steepest pitches — up to 37% — will break you before the summit.

Target an effort in the 85–90% of FTP range on the steadier sections, leaving reserve for the explosive pitches. Use the FTP estimator to anchor those numbers before you ride. On the 37% ramp, power output is largely irrelevant — survival and forward motion become the goal. Stay seated as long as possible to keep rear-wheel traction, then stand only when cadence drops to a stall point.

Gearing Notes

Do not underestimate the gearing requirement. A 34×32 or 34×34 compact setup is a minimum sensible choice. Riders on standard doubles (50/34 with an 11-28 cassette) will almost certainly be forced to a dead stop on the steepest pitch. A wide-range cassette — 32-tooth sprocket or larger — is strongly recommended.

If you are unsure how to match your gearing to gradient demands, review climbing gear ratios before heading out.

Bottom Line

Izpegi Pass is a genuine Category 1 test in a compact package. Its 5.1 km distance invites riders to treat it like a puncheur climb, but the 9.88% average and a 37.04% maximum gradient make that a mistake. Approach it with honest power data, the lowest gearing you can run, and a pacing plan built around the severity of its steepest sections rather than its manageable average.