And you CERTAINLY don't want to be riding a bicycle on a cobblestone street. You'll mess up your rims (if you're riding a racing bike) and hurt yourself in your private area if you don't stand up on the pedals - same as if you roll over a hole in the ground.

There are a few streets like this still around in New York. I don't know why on EARTH they haven't paved these damned things over with tar!! [Linked Image]