PAU, France, July 8 : The Tour de France favourites are set to face their first major high-altitude test on Thursday as the 113th edition of the race passes over the legendary Col du Tourmalet in the final stage of the Pyrenees segment.The peloton will ride 186.2km between Pau and Gavarnie-Gedre during stage six, tackling 4,100 metres of climbing across five categorised climbs including the uphill finish. The Col du Tourmalet summit is located 38km from the finish line.Race organisers lightened the Pyrenean route compared with previous editions, as they want the race to remain undecided until the very end. For that reason, the Alps will offer much harder stages in the Tour's third and last week.Nonetheless, the Col du Tourmalet — one of the most storied climbs in Tour history — remains a k