Excellent public transportation, amazing high-end automobiles and BICYCLES by the thousands are every where in Frankfurt.  Streets have lanes dedicated to bicycle . . . and those are next to the bicycle-dedicated portions of the sidewalks.
Bicycle lock-up racks are also every where:

Park your bike here . . . if you can find a spot!!

It is a bit odd to see a Dad delivering up to three (3!) children hanging off the front/middle/back of his bike en route to schools.  This compares only to well-dressed women in 4 inch heals making their way to a day of work.