Los Angeles police say bike riders who go wild will find themselves with a ticket or a trip to jail.
The Los Angeles Times says the LAPD vowed this week to cite or arrest bikers who break the law during mass rides.
That follows a Friday night incident in the Venice area where hundreds of cyclists broke away from the main pack and swarmed a supermarket parking lot.
Police say some riders drank and smoked marijuana while a half-dozen rode through the store aisles.
Three people were cited and one person was arrested on suspicion of hitting a police officer.
Information from: Los Angeles Times
Copyright 2010 The Associated Press.