Bunderchrinde Pass

Bunderchrinde Pass cycling climb profile

Bunderchrinde Pass is not long in the classic alpine sense, but the numbers make the character very clear. At 8.9 km with an average gradient of 15.11%, this is an HC climb because the difficulty is concentrated rather than spread out. Starting at 1019 m and topping out at 2358 m, it gains 1339 m net from bottom to summit, which tells you the road gives very little away.

That average gradient is the defining feature. On many climbs, an average hides easier linking sections or a few steep ramps. Here, with the available profile reduced to whole-climb data and no separate maximum gradient supplied, the safest tactical read is simple: treat the entire ascent as severe from the start. If you ride into it expecting a conventional warm-up phase, you will likely be forced above target power before the climb has properly begun.

How the gradient feels

The climb should be approached as a sustained low-speed effort where torque management matters as much as aerobic capacity. A 15.11% average over 8.9 km means the limiting factor is not just /glossary/ftp, but whether you can keep the pedals turning smoothly without repeatedly spiking above threshold.

Because the climb rises from 1019 m to 2358 m, the effort also becomes progressively less forgiving as you climb. The profile does not need a documented maximum gradient to be hard. The average already sits in the range where cadence drops, seated climbing becomes muscular, and small pacing errors are expensive.

Pacing and gearing notes

Start below the effort you think you can hold. On a climb this steep, the first few minutes can feel artificially controlled simply because speed is low and there is no obvious acceleration. That is the trap. Power spikes on steep gradients do not always feel dramatic in the moment, but they accumulate quickly.

Practical approach:

• Use your easiest gear from the lower slopes rather than saving it for later.
• Keep cadence as stable as the gradient allows, even if that means accepting a very slow road speed.
• Avoid repeated standing surges unless they are used briefly to unload the legs.
• Pace by sustainable effort, not by speed, because speed will be heavily suppressed by the gradient.
• If riding with power, cap early efforts below target rather than chasing momentum.

For gearing, this is the kind of climb where a compact setup or very low climbing gear is not conservative - it is the rational choice. The cost of being over-geared is high because the climb is both steep and long enough to punish muscular overload. If you are estimating whether your current gearing is suitable, anchor the decision around the average gradient, not the distance. An 8.9 km climb at 15.11% is a very different physiological problem from a longer climb at a more moderate grade.

Bottom line

Bunderchrinde Pass is a compact Swiss HC ascent defined by density of difficulty. The road gains 1339 m net in just 8.9 km, so there is little tactical complexity to hide behind. Ride it with discipline, gear for torque control, and assume the climb will demand patience from the first pedal stroke to the summit.