Surveillance video shows the suspect punching and kicking the victim near Pitkin Avenue and Barbey Street in East New York on Saturday.
Police say the suspect approached the 68-year-old man who was riding a CitiBike and demanded property.
The suspect ran off with the victim's phone and silver necklace.
The victim suffered a broken wrist, a broken nose, and cuts.
ALSO READ | 5 killed in head-on collision on Long Island
* More Brooklyn news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube
Submit a News Tip