Coll dels Reis is a mountain pass at an elevation of 658m (2,158ft) above the sea level, located on the northwest coast of the Spanish Balearic island of Mallorca. It’s one of the most visited by cyclists spots on the island.
The road to the summit, also known as Col de Cal Reis, is called Sa Calobra Road (officially designed MA-2141). It’s a single winding road very narrow with numerous hairpin bends (one that goes back on itself at 270 degrees) and short straights keep the gradients changing which make it difficult to get into a steady rhythm. The road was built in 1932 and includes many steep sections (up to 11%).