"Contrail is a tool for developing bicycle communities". It attaches on the wheels of a bike that applies a thin layer of colored chalk to a bike's tire. As you ride, contrail leaves a faint chalk line behind your bike. This concept created by Studio Gelardi.
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March 21st, 2009 at 10:51 am
Interesting as a concept, but useful for … what, exactly? Getting your butt crack powdered by colored chalk?