Katrin Schultheis and Sandra Sprinkmeier from Germany, the four times World-Champions. Unless you like techno music, I would recommend turning down your speakers on your computer . Music is Erol Alkan and Boys Noize- Lemonade.
More information on Kunstradfahren here.
Via Bicycle 
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I was told that they cook and clean too!
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Thanks very much for sharing this valuable information. I would definitely like.
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