cyclock / bicycle lock

We tie up with a bicycle on a wall, and you prepare to theft.
A bicycle lock stops bicycle theft.
when you don't use lock...
You hang it to a handle or you will wind up on a saddle.
A bicycle lock is burdensome when you don't use it.
There is a lock to have been built in to the back wheel.
However, the thing cannot stop that a thief moves bicycle everyone.
The reason is bicycle wasn't bound.
I propose the lock which isn't burdensome, and is safe.