When artist Jimmy Kuehnle decided to invent an invisible bicycle, man, does he go (almost) all the way. Notice the invisible clothing and invisible helmet. Just be thankful he didn't invent invisible underpants!
Yes, the cycle is completely transparent, except for the chain and bearings. Constructed of Lexan or "bullet proof glass," the bike exists in a dual reality as sculpture and transportation. Once again the outfit compliments the bicycle sculpture this time as a clear vinyl suit. Citizens of Austin and San Antonio saw all or nothing since the bike and the suit were "invisible."
From Jimmy's 2005 project Invisible Bike: Link - via Design Dautore