A brazen bicyclist knocked a Hasidic Jewish man’s fedora off his head as he walked down a Brooklyn street this week, cops said.

And they’re treating it as a hate crime.

The 27-year-old victim, wearing traditional Jewish clothing, was walking along Flushing Avenue near Nostrand Avenue at 2:25 p.m. Wednesday when the passing cyclist slapped off the black hat and peddled away, according to police.

Cops said the suspect was wearing red headphones, a gray and black jacket and riding a silver BMX bike.