Since I bought my bike, I try to ride it as often as I can, e.g. when I go to the university. But it seems my problem is that anytime my car is in reach I use it instead of the bike.
About two years ago, I had a serious accident while riding bike and the problem was that I didn't wear a helmet at that time. So I suffered a huge laceration on my head. Since then I wear a helmet when I ride my bike and I strongly advise everybody who's riding bike to wear a helmet.
Velocity 24 is a bike store in Darmstadt and I can only recommend it to everybody. They have a quite good service and they repaired my bike really quick.