Interestingly, in Germany there are some bicycle "hub" cities the prototypical example would be the city of Münster. My very unscientific feeling is that it's mostly mid sized cities with a university campus (especially if it's a multilocation campus spread across the entire city like in Münster).
Apart from the cities, there's also some pretty nice longer distance bike tracks. I belive Germany has one of the best bike route network/infrastructure. There's the so called D-Route (12 sections): http://www.radnetz-deutschland.de/en/d-routen.html
But the Dutch are #1 when it comes to bikes (imo).
Fun sidenote: The German term for what is typically known as a roadster bike is even "Hollandrad". In the Netherlands it's known as "Omafiets" which roughly translates to grandma-bike :)
its the same in karsruhe, Germany. Medium sized and a university campus (though not that many bicycles, it think 28% of all movement in the city is done by bicycle), but we are improving :D
In Münster it's 40% (number of trips). About two bicycles per citizen. 7% don't own a bicycle, 45% own two or more. Also highest rate of bicycle theft (10 per day). There's a longer abstract in German discussion the reasons why the ratio is so high https://de.wikipedia.org/wiki/Radverkehr_in_M%C3%BCnster. Basically university town, no hills and historically lots of road infrastructure that favors cyclists.
Apart from the cities, there's also some pretty nice longer distance bike tracks. I belive Germany has one of the best bike route network/infrastructure. There's the so called D-Route (12 sections): http://www.radnetz-deutschland.de/en/d-routen.html
But the Dutch are #1 when it comes to bikes (imo).
Fun sidenote: The German term for what is typically known as a roadster bike is even "Hollandrad". In the Netherlands it's known as "Omafiets" which roughly translates to grandma-bike :)