Passo San Michele

Overview

Passo San Michele is a category 2 climb that runs 12.9 km from a valley floor at 211 m up to a summit of 883 m. On paper the average gradient of 5.19% reads as approachable — a steady tempo effort rather than a wall — but the net elevation gain of 672 m over that distance means there is no free ground here. Every kilometre asks for a contribution. What separates San Michele from a simple false flat is its ceiling: a max gradient of 20.47% that hides somewhere in the middle of an otherwise moderate profile, waiting to break a rhythm you thought was settled.

How the Gradient Unfolds

The headline number to respect is the gap between the average and the maximum. A climb that averages 5.19% but spikes to 20.47% is not evenly graded; that 15-point spread tells you the road pitches and eases repeatedly rather than holding one honest slope. Expect stretches well below the average that let you recover, offset by ramps that climb far above it. The recorded total ascent of 659 m sits just below the net gain of 672 m, which confirms the profile is almost relentlessly upward — there is little to no descending inside the climb to give the legs a true break. You gain height nearly the whole way, so the recovery comes from shallower gradient, not from freewheeling.

Pacing Notes

Because the steepest ramp reaches 20.47%, a smooth, even effort is your best defence. Anchor your pacing to your FTP and hold the shallow sections comfortably under threshold so you keep a matchbook in reserve for the pitch that spikes toward 20%. Riders who burn themselves on the early kilometres of a 12.9 km climb rarely recover before the summit at 883 m. If you don't know your sustainable power, run the numbers through the FTP estimator first, then plan to spend the steep ramps a little above threshold and the flatter sections a little below — averaging out across the full 672 m of gain.

Gearing

The 5.19% average is manageable on almost any setup, but the 20.47% maximum is where gear choice earns its keep. A compact chainring is the sensible starting point. Pairing a 34-tooth inner ring with a 34×32 gives most riders enough range to spin the steady sections and survive the ramps. If you tend to grind, weigh less well, or simply want insurance on the steepest pitch, drop to a 34×34 — that extra sprocket keeps your cadence up when the road tilts toward 20% and spares your knees over a full 12.9 km. Err toward the easier ratio; you can always stay in a harder gear, but you can't invent one you didn't bring.

Summary

Passo San Michele rewards patience: a long, steady 12.9 km with a genuinely steep sting that punishes anyone who over-cooks the early slopes. Pace to threshold, gear for the 20.47% ramp, and let the moderate average carry you to the top.

Length: 12.9 km
Average gradient: 5.19%
Max gradient: 20.47%
Start: 211 m
Summit: 883 m
Net gain: 672 m
Total ascent: 659 m
Category: 2