The two were riding against traffic when the crash occurred at the corner of Main and Hadley Avenues around 8 p.m. Tuesday, Clifton Lt. Robert Bracken said.
One was taken to St. Joseph's Medical Center with a head injury, while the other rode away on his bike, Bracken said.
An investigation was ongoing as of Wednesday morning. No summonses had been issued.
Click here to follow Daily Voice Paramus and receive free news updates.