This is my bicycle lock. It uses a key, and doesn't lock the bicycle to anything. It just prevents the rear wheel from turning.
Compared to the U.S., Japan has very few car parking lots, but lots of bicycle parking! Bicycles line the front and side of the grocery store where Itsumi and I shop. An attendant constantly reorganizes the bicycles to make room for more. Side streets are crowded with bicycles but have few cars. Just think how much oil is being saved by every person who is not driving a car. This is how it should be!
I bought a helmet (special ordered it, because it's unfortunately not common for adults to wear bicycle helmets in Japan), I'm looking for a bicycle map of Tokyo in English, and I'm enjoying finding my way around Tokyo by bicycle!