The Frankfurt 'Bier Bike'

OK... so while visiting in Frankfurt a while back we heard this big commotion and saw this giant bike with about 13 people pedaling it down the road. At first I thought it was just some stupid tour thing, but no... it is something much grander. Turns out that in the center of this giant bike is a bar with a couple kegs of beer on tap. I say we get a big group and sign up.