Gestelenpass

Overview

The Gestelenpass is a Category 1 climb that earns its rank the honest way: through sheer duration. Over 17.5 km the road lifts you from a valley floor at 684 m all the way to a 1850 m summit, a net elevation gain of 1166 m. The total ascent registers at 1143 m, meaning the profile is almost relentlessly upward with only the faintest reprieves along the way. At an average gradient of 6.68% this is a climb that rewards patience over aggression, and the 15.71% maximum pitch is a reminder that the average hides some genuinely steep moments.

How the Gradient Unfolds

An average of 6.68% across 17.5 km tells you the workload is spread thin and long rather than concentrated in a single wall. But the gap between that 6.68% average and the 15.71% maximum is wide — roughly nine points — so the climb is not uniform. Expect long stretches that sit close to the average, punctuated by sharper ramps that spike well above it before easing back. Because the total ascent of 1143 m sits just below the net gain of 1166 m, there is virtually no descending to recover on; nearly every metre gained is a metre you keep. Treat the steep pitches as the crux and everything around them as the place to breathe.

Pacing Notes

On a climb this long, discipline beats bravado. Anchor your effort to your FTP and hold something in reserve for the 15.71% ramps, where power will spike whether you like it or not. A sensible target is to settle just below threshold on the average-gradient sections so you have headroom when the road kicks up. If you do not know your threshold number yet, run the numbers through the FTP estimator before you tackle 17.5 km of sustained work. The single biggest mistake here is going out too hard in the first few kilometres; with 1166 m still to climb, an early overreach turns the final third into damage control.

Gearing

With 17.5 km at 6.68% and pitches touching 15.71%, gear low and stay seated wherever you can. A compact 34-tooth chainring is the starting point. Pair it with at least a 34×32 for the steady sections — that gives you a workable cadence at the 6.68% average. But for the 15.71% ramps, a 34×34 is the smarter choice; that extra sprocket keeps your cadence up and your knees intact when the gradient nearly triples. If your bike can take it, fit the 34×34 and be grateful for it on the way up to 1850 m.

Summary

The Gestelenpass is a test of endurance and pacing more than raw power: long, steady, and topped off with ramps that demand respect. Gear low, start conservatively, and let the numbers do the talking.

Length: 17.5 km
Average gradient: 6.68%
Max gradient: 15.71%
Start: 684 m
Summit: 1850 m
Net gain: 1166 m
Total ascent: 1143 m
Category: 1