The girl that everyone has had sex with, the analogy is the town bike that everyone gets a ride from.

A girl who acts as a surrogate sex partner shared by an anonymous group such as a town or province.
A girl who fucks so many men that she approaches the annual statistics of a public service like water or garbage utilities.

The sexual equivalent of a public urinal

A girl that is like a bike that belongs to the town everybody gets a ride

A girl of questionable virtue. i.e a dead cert for the price of a bag of chips and family size bottle of tizer.

A female who gets ridden by all comers (cummers). The word "comers" is a double entendre also meaning "cummers" - semen ejaculators.

A female who pedals (peddles) her ass around town or who is pedalled (peddled) around town. The word "pedal" is a double entendre also meaning "peddle" - to sell.