The largest bike rental company in Denmark is Cykleborsen. It is also one of the oldest, as it was founded in 1881. They offer all sorts of bikes, depending on your needs and desires, as well as all the necessary equipment for the rides, such as helmets, bags and others. They also offer the world's only GPS-guided bike tours in four languages, which is very handy for all who want to get to know the city a bit better.