London mayor Boris Johnson said: "It has been the most incredible epoch in the history of cycling that any of us can remember; and I am absolutely delighted that the world's greatest cycling race is coming to the capital.
"People will see London framed by shooting velocipedes for what will be a fantastic spectacle of sport. I am going to be in the crowd and I hope thousands more will too."
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Scotland Yard said the male youths will appear in custody at Westminster Magistrates' Court on Saturday.
Windy this weekend with gales across northwestern parts of the UK. Rain spreading southeast.
Greater Manchester Police said "inquiries are ongoing to fully understand the circumstances of the incident."