Why does Chris Froome use Osymetric chainrings and do they work?

Bradley Wiggins and Chris Froome both used non-round chainrings on their way to winning the Tour de France. But do they really help?

(Image credit: Watson)

Five years after Sir Bradley Wiggins became the first Briton to win the Tour de France riding oval rings, Chris Froome continues to use Osymetric chainrings on his Team Sky bike.

Wiggins reverted to round rings towards the end of his career and continued to win at the highest level, including the World Championship time trial. Froome has ridden them since 2011, and has since won three Tour titles using the Osymetric rings.

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