From the NY Times:
The outcry has become even more pitched since Sept. 29, when a pack of motorcyclists was involved in an altercation on the Henry Hudson Parkway with a man driving an S.U.V. The police said some of the motorcyclists pulled the driver from his vehicle and beat him. One motorcyclist was hospitalized, and this month 11 men, including an undercover police officer, were indicted in connection with the attack; all but one were charged with gang assault. And while helmet-cam videos do not show dirt bikers in that melee, bikers say the authorities are intent on shutting down their urban sport.
Back in Harlem, they unloaded the bikes and rode off into the streets. Fire trucks and police cruisers showed up almost instantly. It is illegal to ride a dirt bike on New York City streets.
“This is why we rip and run in the streets,” Joseph Middleton, 31, a biker from Harlem, said. “There really is nowhere to ride.”
So far this year in the city, there have been at least 437 motorcyclist and dirt biker arrests: nearly 200 for reckless endangerment or reckless driving, and 5,498 summonses for license plate violations and other infractions. Joseph A. McCormack, the chief of vehicular crimes at the Bronx district attorney’s office, said prosecutors there had seen a sharp rise in the number of cases involving dirt bikes and all-terrain vehicles in recent years. There were more than 200 cases — including reckless driving, vehicle violations and, in a few instances, striking pedestrians — this summer alone.