The sophisticated bicycle has attracted fans in Europe and the U.S., but repairs under warranty have bled the company of money.

A cherished city institution is adapting to keep the love of cycling going strong. Naked cycling, that is — Philadelphia's annual Naked Bike Ride is asking participants to mask up for safety.

Atlanta police are cracking down on scooters after at least one death and hundreds of injuries. It's illegal to ride them on sidewalks or to violate...