Maniac bashes NYC bike shop worker with helmet before he’s stabbed by another man and bites cop: wild video

Wild surveillance video captures the moment a maniac bashed a Queens bike shop worker over the head with a helmet — before he was stabbed by another man who intervened, according to police.

The melee began just before 1 p.m. Monday when the 35-year-old man flew into a rage outside the Fly E-Bike shop on 42nd Street near Broadway in Astoria, authorities said. 

Footage obtained by The Post captured the moment the brute – who appeared to have been yelling at the 28-year-old worker – suddenly walloped him over the head with the helmet. 

A second later, another man sprinted out of the store and chased the aggressor into the street, the video shows.

Someone from within the store stabbed the helmet-wielding suspect in the stomach, cops said. It wasn’t immediately clear if it was the man seen running after him.

Despite being wounded, the first aggressor then could be seen on video slamming the helmet into the window of the shop.

Police responded to the scene and tried to cuff the unhinged man when he bit one of the cops on the hand, authorities said.

The clip shows officers having a hard time getting the man to put his hands behind his back – a struggle that ends with them grappling on the floor. 

The stabbed man was taken to the Elmhurst Hospital Center, where he was listed in stable condition. 

Charges are pending against him. 

The officer was also taken to the hospital for his injury, cops said. 

The man who had stabbed the first attacker did not face any charges by Monday evening. 

It is unclear whether he is also an employee of the shop, or a customer who happened to intervene, police said.