Peter Sagan of Slovakia, wearing the best sprinter's green jersey crosses the finish line ahead of Norway’s Alexander Kristoff to win the sixteenth stage of the Tour de France cycling race over 209 kilometers (129.9 miles) with start in Moirans-en-Montagne and finish in Bern, Switzerland, Monday, July 18, 2016. (AP Photo/Christophe Ena)

Reigning world road race champion Peter Sagan is in good company as he practices for the men's mountain bike race on Sunday at the Summer Olympics.

Sagan says he is fulfilling a dream by switching to the mountain race. He's a former junior champion in the discipline.

Sagan decided in January to forego the road race at the Rio Games after deciding that course was too hilly for him to contend. So he's been focusing on the mountain bike since winning another best sprinter's green jersey at the Tour de France last month.

Two of the top contenders don't seem to mind one bit.



1st ride on the Olympic track. It was nice to ride with @petosagan

A video posted by Julien Absalon (@julien_absalon) on



Absalon and Kulhavy, though, will be starting in the first line. Absalon, who is ranked first in the world, won gold in 2004 and 2008. Kulhavy is the defending gold medalist.

But Sagan will be all the way in the back, since he's primarily a road racer and isn't ranked highly on the mountain bike. The International Cycling Union rankings can be found here.