La Marmotte Alpes Cyclo Sportive is one of the toughest one-day cycling events in the world.The official route covers 174 km with over 5,000 metres of climbing, finishing on the legendary Alpe d’Huez. This page supports the La Marmotte flyby route video, helping you visualise the course, understand where riders struggle, and prepare more intelligently … Continue reading La Marmotte Alps Route Guide – Flyby, Distance, Climbs & GPX