A mainstay of the iconic La Marmotte gran fondo, the Glandon may lull cyclists in with its 4.8 per cent average gradient. But underestimate it at your peril
How to climb the Col du Glandon (video)
A mainstay of the iconic La Marmotte gran fondo, the Glandon may lull cyclists in with its 4.8 per cent average gradient. But underestimate it at your peril