Coll de Vimboca

Overview

Coll de Vimboca is a Category 1 climb that demands respect from the first pedal stroke. Over 15.4 km it averages 7.13%, dragging you from a start elevation of 696 m up to a summit at 1796 m. That is a net elevation gain of 1100 m, with a total ascent of 1055 m once the small recoveries and dips are accounted for. This is not a wall you sprint at and blow up on — it is a long, sustained effort where the challenge is holding a steady output as the metres tick by. On the five-tier scale (HC hardest, then 1, 2, 3, 4), Category 1 places Vimboca firmly among the serious mountain tests, one rung below the hors catégorie monsters.

How the Gradient Unfolds

The defining feature here is consistency. A 7.13% average over 15.4 km means there is very little true respite; the road is almost always tilted against you. With a net gain of 1100 m but a total ascent of 1055 m, the difference tells you the profile stays honest — there are no long descents to give the legs a break and then punish you again. Expect the gradient to hover around that average for long stretches, occasionally steepening on the ramps and easing only slightly on the shallower pitches. Treat the whole 15.4 km as one continuous block rather than a series of separate efforts.

Pacing Notes

The single most important number on Vimboca is your sustainable power. A climb of 15.4 km at 7.13% will take most riders well beyond half an hour, so this is a threshold-and-below effort, not a maximal one. Anchor your pacing to your FTP: riding at or just under it for the full climb will get you to the top intact, while going over it early on a 7.13% grade almost guarantees you fade badly in the final kilometres. If you do not know your threshold, run the numbers through the FTP estimator before you tackle this one. Start conservatively, settle into a rhythm you could hold to the summit, and only lift the pace once the 1796 m sign is in reach.

Gearing

With 15.4 km at a 7.13% average and 1100 m to climb, gearing is about protecting your cadence over the long haul. For most riders a compact chainring paired with a wide-range cassette is the right call. A 34×32 will get you up if you are strong and comfortable grinding, but on a sustained Category 1 climb like this many riders will be happier with a 34×34, which buys enough extra range to keep the legs spinning rather than labouring when the gradient nudges above average. If your bike accepts it, err toward the easier ratio — you can always stay in a harder gear, but you cannot invent a gear you did not bring.

Summary

Coll de Vimboca rewards patience: 15.4 km of steady 7.13% gradient, 1100 m of vertical, and a summit at 1796 m that comes only to riders who paced the whole thing. Bring the right gearing, respect your threshold, and it becomes a rhythm climb rather than a fight.

Length: 15.4 km
Average gradient: 7.13%
Max gradient: n/a
Start: 696 m
Summit: 1796 m
Net gain: 1100 m
Total ascent: 1055 m
Category: 1