Team Sky mechanic Gary Blem admitted to Cyclingnews that he was worried that one of his riders could have a problem and so the British team has opted for a super low gear.
"We'll be using a compact 34 with a 32 cassette tooth sprocket on the rear. Not all the guys will perhaps use the 32 but the high-cadence guys like Richie Porte probably will," he explained.
"The challenge with that is the clearance of the pulley wheel of the rear derailleur and the 32 sprocket. Shimano doesn't have an 11-speed long-cage derailleur, so we've had to modify the derailleur ourselves to make it work."
"It's a challenge for us because we've never tried it in race conditions yet. We're under pressure to make sure it works because we're going into mountain bike gearing."