Mallorca is the most ridden island in the world for one reason. The Serra de Tramuntana runs the whole northwest coast, a wall of limestone that rises straight out of the Mediterranean, and through it winds a network of roads built by hand in another century. The climbs are long enough to matter and never brutal for the sake of it. The tarmac is some of the smoothest in Europe. And when you crest a col, the reward is usually the sea.
The island owes its two most famous roads to one man. Antonio Parietti was the engineer who drew the road to Cap de Formentor in 1925 and then, in 1932, the descent to Sa Calobra, 26 hairpins coiling down to a cove that can only be reached by that road or by boat. He designed them for the pleasure of travelling them, which is why they feel like they were built for bicycles.
Winter is the point. From late January the professional peloton moves in, the Challenge Mallorca opens the European season, and the roads around Port de Pollença fill with team kit. By April the Mallorca 312 sends thousands of riders around the whole range in a day. Summer belongs to the beaches. Riders come back when the air cools in October.