I rode a bicycle everywhere for about 14 years. It was a 21-speed MTB. I registered it with the city and they issued a sticker with a unique number. I used tw

I rode a bicycle everywhere for about 14 years. It was a 21-speed MTB. I registered it with the city and they issued a sticker with a unique number. I used two locks: a cable lock and a U-lock. Furthermore, the bicycle had quick-release for both the front wheel and the seat. So what I usually did is secure the front wheel to the rest of bike and/or the stand, secure the rear wheel to the stand, and then I released the seat to bring it along with me. I suppose that carrying the seat around made me look menacing, because it would be a good blunt weapon in a fight, which never happened. I imagine that thieves were deterred by not being able to ride off with a seat attached. Someone did manage to steal only the seat once, which was only a minor annoyance. When I was done using the bicycle, I wanted to give it to a friend. I'm not sure he really wanted it, but I wrote a letter of transfer so it would be known that the registered bicycle was legally handed over. By that time, the city had changed their registration procedures anyway, probably to an electronic method.