The route could put off specialists against the clock like Tom Dumoulin, last year's popular runner-up, who had said earlier this month that he was targeting the 2019 edition of the race but would reserve judgement until the parcours was revealed.
"Mark Cavendish, the greatest sprinter in Tour history, showed past year the attitude our sprinters have", he said.
The 2019 race features a tough mountain programme, with three finishes above 2,000 metres.
British sprinter Mark Cavendish was eliminated from the 2018 Tour after missing the time cut on stage 11 but said the 2019 course should give him more chances to add to his 30 stage wins as he tries to beat Merckx's record of 34. "I haven't even seen the route for the Giro yet", he said.
There the peloton will again take on the Col du Tourmalet - where 100 years ago the first rider to wear the yellow jersey, Eugene Christophe, suffered a famous mechanical failure - before heading across to its brutal and decisive finale in the Alps. "It's got a bit of everything in it with some very high climbs indeed being the first thing that comes to mind", he said.
"It's going to be a tough, tough, tough race", said four-time champion Chris Froome.
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He said areas farther away from the coast could see some freezing rain and snow before the storm pushes out Saturday evening. Rain will cover NY and New England with rain - and in the far north with snow - on Saturday night.
"Froome remains an iconic leader for Sky, and Thomas has found his Holy Grail'".
Next year's 3460km route includes a record 30 mountain passes - climbs rated category two or higher - and five summit finishes, but Prudhomme noted there were fewer hors categorie climbs - the hardest ranking of all - than in previous years with the goal to encourage attacks on more punchy roads.
"Over the century, the yellow jersey has left its mark". "That's an extra kilometer at an average gradient of 9.5%". "Also with the time trial in Pau will be crucial so as always it will be a well-rounded rider and team". "It's on rolling terrain with a seven percent gradient hill, not as tough as the one a year ago, though", says race planner Thierry Gouvenou. This year's ascent is on a comparatively short stage of 117km.
July 25 - stage 18: Embrun - Valloire With summits sitting at over 2000 metres in altitude, the great Alpine classics of Vars, Izoard and Galibier speak for themselves. The peloton will then swing past the Tignes dam and start a 7.5km climb before a final, flat kilometer rounds out the stage in the thin mountain air.
Critics have suggested the introduction of the tool has led to Team Sky's dominance of Grand Tours, the power meters bringing in a negative, more measured approach as opposed to rider's racing on instinct.
After the tired peloton is flown toward Paris, the race ends the next day with its processional showcase stage on the Champs-Elysees.