Wiggins was one minute down on Nibali at the first time check, climbs 3 seconds better than Nibali so took 68 seconds on the 'flat' section, give or take a 34 [with a flat section of 18 kilometres] minute effort. Perhaps even more when you take into account there was another section of downhilling in that effort.
Including that mechanical - lets say 20 seconds - and his again descending like a scared little kid he would have put Nibali on two and a half minutes, minimum. On a course that definitely suited Nibali, who must have descended like a Nibali, too bad the RAI cameras had only eye for Wiggo.
What is interesting is Wiggins only took 7 seconds on Dowsett on the 'flat' part.