This neat commercial for Cycling Canada -- an organisation for the promotion of cycling in Canada -- shows a bunch of bikes riding themselves and having fun. The cyclist-less bikes appear drifting on dirt roads, descending mountains full speed and zooming across the city.
The commercial was made by director Mark Zibert and the effects house Alter Ego. They shot the cyclist riding the bikes dressed on chroma suits and removed them digitally. This is how they made it: