Sky are one of the most scientifically advanced teams who are constantly monitoring their riders's fitness etc.
Especially with Bradley who I am sure, at 34 understands totally what condition he needs to be in to be competitive at the tour, especially after 2010 Tour. And as he is the team leader and his success (plus cav now) will effectively determine how succesful they will consider their season, I am sure they will be keeping an extra eye on him, so I have no doubt that sky + wiggins know what they're doing and he will reach the tour in top shape.