Classic one day Cyclo Sportive, perhaps the hardest. 175kms with over 5,000 meters of climbing (17,000ft). Four classic climbs of Tour d'France, Col de la Croix de Fer, Col du Telegraph, Col du Galibier and finish at the top of 21 hairpin switchbacks of Alpe D'Hurez!
http://www.sportcommunication.com/GT/index.php?langue=1