Abandoned bikes

Let me spell it out for you in a more succinct way.

Gaining the permission of anyone to re-appropriate ownership or property which is not theirs to give away is called theft (Even if you do earn gutter rent working as an "honest barman" in one of this cities fine establishments).

ABANDONED, anyway, if an owner exists he will find out the whereabouts of his frame. re check your concept of stealing i'm sure that that brain of yours would be glad to be given a bit of exercise...don't forget the telekinesis whilst your at it