Places to rent bicycles in Berlin
12:35 AMGoing around Berlin by bike is a nice alternative. It could be a little bit dangerous if you are not used to but it is also a lot of fun. Besides reducing some calories after eating some famous "curry wurst" ;-)
The standard tourist price is 10€ but you can find them for less. Here are some options: You usually need to leave your id card or passport for the rent.
https://www.facebook.com/RentABike44/info
http://www.berlinfahrradverleih.com/
http://www.helloworldberlin.com/
http://www.bike-rent-berlin.de/