I'm thinking of jumping on a stranger's bicycle and riding away.
You are overcomlicating things. Isn't that stealing?
Yes, I know it is but I don't really care.
It's wrong to steal other people's bike. It cost a lot of money and I am sure some of them developed some liking towards their property.
It's just a bike, it's not like I'm going to kill the owner, please don't get so worked up about it.
That person may need to that bike to get to work or home. Have you thought about buying your own bike and not stealing one?