2:30 in 55k? if he doesn't lose close to 4 minutes it'll be a miracle. Based on last year's tour he could conceivably lose 5 minutes.
Last years Tour?What?Wiggins was in form of his life and Henao wasnt there.How can you compare these?
Firstly,its extra technical TT,up and downs,lot of corners,Henao explosivness is tailor made for this TT,he can sprint off the corners etc.Secondly,there is 3k hill in the end,which will be pretty decisive,last km is more than 10%,so this is again for Henao.I say 2'30 - at max. 3'00 on Wiggins.
Henao lost 3'15" to Tony Martin in a 34.8km ITT earlier this season.
Losing 5 minutes to Wiggins in a 54.8 ITT won't be surprising.
And there is the OTHER ITT in the Giro. Henao won't lose as much time seeing as it is an MTT, but he will still lose time.
Oh yeah he lost it at mighty Algarve in which Matin wanted desperately to win.
It was first stage race of the year for him and Martin is natural TT and he is better than Wiggins imo.
Other arguments are in the 1.part of this post.
MTT-imo he will gain on Wiggins couple of seconds,he is better climber