In reply to kevin stephens:
Wiggo's got nothing left to prove in Grand Tours -- he's ridden 12 since 2005, (crashed out of 3) and had 3 podium places including overall win in the TDF. He knows in his own mind that he's little chance of winning another one unless they have more ITT km, and some less brutal and punchy climbs. He also knows the effort that is required to get his body down the sort of weight he was when he won in 2012 - and it doesn't get easier the older you get. Whilst he's certainly got the 'engine' to ride many more grand tours, he's a 'winner' and I do not see him accepting a super domestique role, or that of a solo brekaway specialist like Jensie - particularly when he's other unfulfilled ambitions like the Worlds ITT, and another Olympic Gold. I am a little surprised that he's not going for the Commonwealth ITT, for if he won it, he would only be one step away from completing the equivalent of the Time Trial 'Grand Slam' of National, Olympic, Commonwealth and World titles. With the Worlds course in Spain this year being a fairly lumpy one, it might suit Wiggo better than Tony Martin.
On another level, he's a family man with kids - and I know from personal experience how hard it can be to spend large chunks of the year away from them over many years - particularly when the kids are in their teens. Being more track focussed he has the opportunity of spending a lot more time based at home - and within riding distance of the Manchester Velodrome.