Coll de s'Heura from Son Serralta

The carretera de Sobremunt / Ma-1041 crosses coll de s'Heura at 324 m. Climbed from Son Serralta it is 9.6 km long and gains 222 m, an average of 2.3%.

Its steepest kilometre averages 14.1%, starting at km 2.6 — steeper than the 7.1% median of every climb measured here. Of the 75 climb-sides in this catalogue it is the 29th biggest by height gained — more than the 193 m median — and the 3rd steepest over a kilometre.

Son Serralta is not the foot of the climb: 5.8 km of road separates the village from the lowest point, and that distance is not in any figure on this page. The climb is measured from where the road stops going down — which on this one means you will have ridden 5.8 km before the numbers below start.

The shape of it

Length

9.6 km

from 101 m at the foot to 324 m at the top

Height gained

222 m

summit minus the lowest point on the road — not a running total of every rise

Average gradient

2.3%

height gained over length

Steepest kilometre

14.1%

from km 2.6

Kilometre by kilometre

The hardest whole kilometre in the table below runs from km 3.0, at 14.0% — lower than the 14.1% steepest kilometre above, because that window slides ten metres at a time and does not have to begin where a kilometre does. The profile is not monotonic — at least one kilometre of this climb goes downhill, which is why the height gained is smaller than the total ascent of 512 m. Every figure below is read off the same elevation series, sampled every 10 m and smoothed over 50 m.

Where it stands, in a set measured the same way

Ranks are the reason this catalogue exists. Anywhere else, comparing two Mallorcan climbs means comparing one person's bike computer with another site's copy of a third site — here both sides of every row below came off the same script, measure-climbs.mjs, so the comparison is the part you can trust even where you argue with an individual number.

The gear it asks for

The number that decides whether you ride up a climb or walk it is not its average. It is the steepest sustained kilometre, which here is 14.1% — so that is what this calculator is wired to. It opens on this climb; change the chainring, the cassette and your weight and it will tell you what cadence that gear actually turns.

The other side

Coll de s'Heura is measured from both sides, so the two can be put beside each other — which is the comparison most climb lists cannot make, because they list a pass once, from whichever direction someone happened to ride it.

What else is close

The nearest measured climbs, straight-line between summits. Straight-line and not by road, deliberately: in the Tramuntana the road between two summits four kilometres apart can be fifteen, and a figure that looks like a riding distance but is not one is worse than an honest approximation.

Or go back to the whole atlas, where all 75 climb-sides can be filtered and sorted at once.

How this was measured, and what it does not know

• The inventory is queried from OpenStreetMap rather than written down: every named pass on a paved road, and every named summit a paved road dead-ends at above 150 m. Each entry carries the OSM id of its top and of the village it starts from.
• Ways tagged as closed to the public — private, no, customers, permit — are removed from the road network before anything is routed, so no climb here is measured up somebody’s drive. A road shut to cars but open to bicycles is kept.
• The road is the OpenStreetMap centreline of whichever road actually crosses the pass — not a GPS trace of one ride, so no rider’s wander or lost signal is in the number.
• Elevation is sampled every 10 m from the Spanish national 5 m terrain model, and interpolated in a straight line through tunnels and over bridges, where a terrain model reads the mountain above or the valley below.
• The foot of the climb is the lowest point on that road between the summit and the named village. The distance from the village to the foot is reported separately, because on several of these climbs it is kilometres.
• Height gained is summit minus foot. It is not a running total of every rise, which depends entirely on the sampling interval and is the single biggest reason published figures disagree.
• Average gradient is height gained over length — not the mean of the per-sample gradients, which over-weights the flat bits.
• The steepest kilometre is the largest height gain over any 1,000 m window on the climb, sliding 10 m at a time.

How we got this Inventory queried from OpenStreetMap; the road walked from Son Serralta to coll de s'Heura on the filtered island road graph; elevation sampled every 10 m and smoothed over 50 m. Comarca from OpenStreetMap admin_level=7 boundaries by point-in-polygon.Computed from OpenStreetMap road centrelines (ODbL) and IGN Elevacion4258_5, Spain’s 5 m national terrain model (CC BY 4.0 scne.es).Computed 5 August 2026.

Sources, because these licences require the attribution: road geometry © OpenStreetMap contributors (ODbL); elevation from the Instituto Geográfico Nacional (CC BY 4.0 scne.es); comarca boundaries from OpenStreetMap admin_level=7. This climb clears the 100 m the atlas requires of an entry; the ones that do not are listed there with their figures.

Getting here: Son Serralta is the village the climb starts from, so it is the sensible place to stay the night before if you want the road to yourself, and a hire car is how most riders reach this part of the island from Palma. Both links are marked and pay us if you use them. We have no arrangement with any Mallorcan bike-hire company, so there is nothing to recommend there and we are not going to invent one.