The 35-year-old Swiss, who won gold in the 2008 men's time trial in Beijing, announced the news after Wednesday's stage 17 from his home city of Berne to Finhaut-Emosson.
The 35-year-old Swiss, who won gold in the 2008 men's time trial in Beijing, announced the news after Wednesday's stage 17 from his home city of Berne to Finhaut-Emosson.