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how does the bike stand by itself?!
If only there was some kind of software to digitally alter photographs...
In all seriousness; probably just used Photoshop to remove the object that's holding the bike up. It's quite easy to do (especially with such a background).
Actually; in the first image I think the hand that's holding the seat has been removed: http://puu.sh/kY9yb/f9f7e2e262.png. I can tell by the pixels!
This is one of my favorite shopped bicycle images, because you can still see the shadow of the person holding the bike up.
This makes my brain explode, how does the bike stand by itself?!