Čertovica

Overview

Čertovica is a long-haul category-2 climb that rewards patience over punch. Over 21.6 km it lifts you from 477 m at the base to a 1234 m summit, a net gain of 757 m. The average gradient of 3.51% sits firmly in tempo territory, but the total ascent of 740 m confirms what your legs will tell you: this is a climb of accumulation, not a single crushing wall. The distance is the real difficulty here. At 21.6 km, Čertovica demands sustained effort for the better part of an hour, and the challenge lies in holding a rhythm steady enough to reach the top without blowing up.

How the Gradient Unfolds

The shape of Čertovica is defined by the gap between its 3.51% average and its 7.53% maximum. That 4.02-point spread tells you the road is not uniform. Long stretches of shallow, rolling ascent are punctuated by steeper ramps that briefly touch the maximum before easing off again. Because the average is so moderate, the flatter sections likely sit well below 3.51%, which means the steeper pitches carry more of the 757 m of vertical gain than their length suggests. Expect to shift between two rhythms all day: an efficient tempo grind on the gentle grades, and a firmer, more deliberate push whenever the gradient rears toward that 7.53% ceiling.

Pacing Notes

On a climb this long, pacing discipline is everything. The 21.6 km distance is far too long to attack from the bottom, so anchor your effort to your sustainable power. Riding at or just under your FTP will let you absorb the steeper ramps without going into the red on the shallow sections. If you don't know your threshold, the FTP estimator will give you a working number to plan around. The key is to spend your matches on the pitches approaching 7.53% and recover actively on the flatter 3.51%-and-below stretches, rather than burning energy trying to hold a constant speed that the changing gradient won't allow.

Gearing

Because the average gradient is a manageable 3.51%, you won't need ultra-low ratios, but the 7.53% ramps arriving 15 to 20 km deep into the effort change the math. Fatigue turns a moderate ramp into a hard one. A compact 34-tooth chainring paired with a 34×32 low gear is a sensible baseline for most riders, giving you enough range to spin the steeper sections without grinding. If you climb at a lower cadence, carry extra load, or simply want insurance for the back half of a 21.6 km climb, step up to a 34×34. The larger sprocket costs you nothing on the flat and buys valuable comfort when the total ascent of 740 m has already drained your legs.

Summary

Čertovica is a classic endurance climb: long, steady, and defined more by its 21.6 km distance than by any single steep section. Ride it with a controlled tempo, respect the 7.53% ramps, and let the gearing carry you through the final kilometers to the 1234 m summit.

Length: 21.6 km
Average gradient: 3.51%
Max gradient: 7.53%
Start: 477 m
Summit: 1234 m
Net gain: 757 m
Total ascent: 740 m
Category: 2