Puerto del Arenal

Overview

Puerto del Arenal is a category 1 climb that does not bother easing you in. Over just 8 km it averages a brutal 9.14%, dragging you from a start elevation of 625 m to a 1357 m summit. That is 732 m of net elevation gain packed into a short distance, with 689 m of total ascent — meaning the road climbs almost relentlessly, giving back very little in false flat or descent. The headline number that will stay with you, though, is the maximum gradient of 22.82%, a wall steep enough to threaten your traction and your composure in equal measure.

How the Gradient Unfolds

A 9.14% average across 8 km already places this among the genuinely hard climbs, but averages hide the story. With a max of 22.82% — more than twice the average — the road clearly pitches into savage ramps that spike well above what your legs settle into. Expect the gradient to swing violently: stretches near or below the average that let you find a rhythm, punctuated by kicks that force you out of the saddle or deep into your easiest gear. Because total ascent (689 m) sits below net gain (732 m) only in the sense that the profile climbs almost purely upward, there is no recovery to bank on. Every metre you lose to a steep ramp must simply be endured, not spun out.

Pacing Notes

On a climb this steep and this short, discipline in the first two kilometres decides everything. Anchor your effort to your FTP and resist the temptation to chase the early gradient — the 22.82% ramps will punish anyone who arrives already over threshold. Aim to climb the shallower sections just below FTP so you have headroom to surge over the walls without blowing apart. If you are unsure of your current number, run it through the FTP estimator before you plan your target. A 9.14% average sustained for 8 km is a long time at a hard tempo, so treat the summit at 1357 m as a target to reach intact, not a sprint.

Gearing

Gear for the walls, not the average. A 9.14% mean gradient with pitches to 22.82% demands a wide, forgiving cassette. A compact 34-tooth chainring paired with a 34×32 setup is a sensible floor for strong climbers, but on ramps this steep most riders will be grateful for a 34×34. If your frame and derailleur can take even more range, take it — you cannot spin too easily when the road tilts past 20%, and grinding a gear that is too big over a 22.82% wall is how you stall, unclip, or cook your legs before the 1357 m summit.

Summary

Puerto del Arenal is short, savage and unforgiving: 8 km that never lets up, a 9.14% average that hides walls of 22.82%, and 732 m of net height to be earned the hard way. Pace it to your FTP, gear it generously, and respect the ramps.

Length: 8 km
Average gradient: 9.14%
Max gradient: 22.82%
Start: 625 m
Summit: 1357 m
Net gain: 732 m
Total ascent: 689 m
Category: 1