It was plain to see that speeds were high - 54.8 kilometers were covered in the first hour of racing - .
It was n't clear just how high they were until Cancellara tweeted after the stage that he had set a new flat road record for himself .
It was plain to see that speeds were high - 54.8 kilometers were covered in the first hour of racing - but it was n't clear just how high they were until Cancellara tweeted after the stage that he had set a new flat road record for himself .