San Bernardino Pass

Overview

San Bernardino Pass sits in the Swiss Alps and earns its Category 2 rating through a combination of sustained gradient and a maximum ramp that reaches 31.23% — one of the sharpest single pitches you'll encounter on a paved alpine road. The climb runs 8.9 km from start to summit, gaining 513 m net in elevation. The total ascent of 934 m against a net gain of 513 m tells you immediately that the road is not a clean, linear grind — there are undulations, and the terrain gives and takes throughout.

The start elevation of 1,553 m means you're already well above the valley floor before you turn a pedal. Thin air is a genuine factor here, particularly for riders who have driven or transferred to the base rather than ascending gradually from lower elevations.

How the Gradient Unfolds

The 5.75% average is genuinely average in the truest sense — it describes the climb as a whole but masks significant variation. With total ascent nearly double the net elevation gain, expect sections that relax toward false flat or brief descent, followed by ramps that drive well above the average.

The 31.23% maximum gradient is the number that demands respect. A pitch that steep on a loaded climbing bike requires:

• Full commitment to gear selection before you hit it. Attempting to shift under extreme load at 30%+ risks chain drops or missed shifts.
• Line choice. On steep hairpins, the outside of the bend adds distance but softens the effective gradient fractionally. Take it.
• Standing cadence management. Most riders will need to stand on pitches above 20%, but uncontrolled surging on a 30%+ ramp creates an FTP-busting effort that compromises the remaining climb.

The gap between the average and maximum gradient also implies that the hardest sections are concentrated — likely on specific hairpins or a distinct steep middle or upper sector rather than distributed evenly. Treat the gentler sections as recovery, not opportunity to accelerate.

Pacing Notes

Because the total ascent (934 m) is so much larger than the net gain (513 m), average power output will understate the physiological demand. Riders who pace by gradient or feel will cope better than those locked to a flat watts-per-kilogram target derived from a simpler climb.

Recommended approach:

• Ride the lower, gentler sections at or slightly below threshold — conserve without going cold.
• Identify the steep pitches early and pre-select your lowest gear before the gradient kicks. There is no benefit to holding a bigger gear into a 30%+ wall.
• If your bike is geared for 28–30% maximum — which many compact or 1x setups are not — double-check before you start. A 31.23% pitch on an undergeared bike means unclipping. Use the FTP estimator to calculate realistic power targets for the gradient range you'll face.
• The summit sits at 2,066 m. Altitude-related fatigue compounds quickly above 2,000 m if you've burned matches early.

Gearing

For a climb with a 31.23% maximum gradient, a compact chainset (50/34) with an 11-32 or 11-34 cassette is the practical minimum. Riders on semi-compact or standard setups should carry a 34-tooth or larger rear cog, or seriously reconsider the gear choice. A 1x drivetrain needs a wide-range cassette — 10-42 or 10-46 — to cover this range without being spun out on the flatter approach sections.

Category 2 status means this climb is hard but not at the ceiling of alpine difficulty. Fit riders with appropriate gearing and disciplined pacing will summit in control. Riders who underestimate the maximum gradient or start too hard on the gentler lower slopes will pay for it on the steep pitches above.