Colle di Caf

Overview

Colle di Caf is an hors catégorie climb that earns its top rating on gradient alone. Over 8.4 km the road climbs from 280 m to 1241 m, a net gain of 961 m at an average of 11.38%. That average is the headline number here: most HC climbs sit several points lower, so double digits sustained for the better part of an hour puts Caf into rarefied territory. With a maximum pitch of 22.2%, there is no easy stretch to hide on — this is a climb defined by its uphill relentlessness rather than its length.

How the Gradient Unfolds

An 11.38% average across 8.4 km means the road rarely dips below a genuinely steep grade. The total ascent of 931 m sits just under the 961 m net gain, which tells you there is very little false-flat or descending relief mixed in — nearly every metre of forward progress is also a metre upward. The gradient peaks at 22.2%, more than double the average, so expect ramps that force you well out of any rhythm you've settled into. Practically, the climb behaves as one long, uniformly severe effort punctuated by short walls. There is no summit-finish flattening to recover on; the steepest sections can arrive at any point, so mentally you should treat the whole 8.4 km as a single sustained wall.

Pacing Notes

On a climb this steep, pacing discipline matters more than on gentler ascents because there is nowhere to soft-pedal and recover. Anchor your effort to your FTP and hold something a touch below threshold on the average grade, leaving headroom for the 22.2% ramps that will spike your power sharply. If you don't know your threshold number, run it through the FTP estimator before you plan this one. Going out too hard in the first kilometre is the classic error here — the 11.38% average will not forgive an early over-effort, and there's no shallow section later to claw back losses. Settle in early, keep cadence as high as your gearing allows, and save any surges for the final push to 1241 m.

Gearing

Gear for the steepest realistic pitch, not the average. With a 22.2% maximum and an 11.38% mean over 8.4 km, most riders will want the easiest cassette they can fit. A compact 34-tooth chainring paired with a 34×32 is a sensible floor for strong climbers, but on a wall this sustained a 34×34 is the smarter choice for most, giving you enough range to spin rather than grind through the steepest ramps. If your bike accepts a wider cassette than 34×34, don't hesitate — protecting your knees and cadence over 961 m of climbing pays off long before the summit.

Summary

Colle di Caf is a pure gradient test: 8.4 km, an 11.38% average, and 22.2% at its worst, hauling you 961 m up to 1241 m. Respect the average, gear generously, and pace from the bottom.

Length: 8.4 km
Average gradient: 11.38%
Max gradient: 22.2%
Start: 280 m
Summit: 1241 m
Net gain: 961 m
Total ascent: 931 m
Category: HC