Sa Calobra starts where the road ends: at a small cove on Mallorca's north-west coast, hemmed in by cliffs. From the water the road climbs straight back out, 10.1 km and 707 m to Coll dels Reis. There is no other way out of the cove, so every rider who goes down has to climb back up.
It is one of the most photographed roads in cycling. The tarmac folds over itself in a string of hairpins, and near the top it loops under itself in a full knot. Riders come from all over Europe every spring to time themselves on it.
The gradient barely changes. Around 7% from the bottom to the top, with no flat sections to recover on and no descents to steal time back. That steadiness is what makes it hard. You find a rhythm early and hold it for most of an hour. It is a long effort at any power, and a test of patience as much as strength.
In Atlas Indoor you ride the real road, corner for corner, with the gradient sent to your smart trainer. Use it to rehearse before a Mallorca trip, to benchmark your climbing through the winter, or to chase a ghost of your own best ride up to the top at 723 m.
How to ride Sa Calobra climb indoors
Start slower than feels right. The first two kilometres tempt you to push, and you pay for it in the knot near the top. Aim for a power you could hold for an hour, stay seated through the hairpins, and save anything left for the last kilometre to Coll dels Reis.
New to indoor riding? See the Atlas Indoor guide or how to connect your trainer.
Sa Calobra climb: questions
How long does Sa Calobra climb take to ride indoors?
About 1 h 10 min at 150 W, 55 min at 200 W, 45 min at 250 W. Estimates assume steady power and a 75 kg rider on an 8 kg bike, using the same physics as the ride itself.
How hard is Sa Calobra climb?
Atlas rates it very hard: 10.1 km with 707 m of climbing, an average climbing gradient of 7% and a steepest kilometre of about 8.8%.
Do I need a smart trainer?
A controllable smart trainer changes resistance with the road's gradient. A power meter or basic Bluetooth trainer also works for a recorded ride. Without either, you can explore the route with demo watts, but demo rides don't count towards results.