Police are investigating a bike crash on Jamaica Bay Greenway that has a man fighting for his life.

Authorities say a 34-year-old man was riding his bike down the bike path Wednesday on 103rd Street as a 67-year-old man was standing next to his parked e-bike on the bike path.

The 34-year-old allegedly struck the older man and his unoccupied e-bike, causing the man to fall and suffer severe head trauma.

He's currently in critical condition at a hospital. The other man has minor injuries.

The NYPD's Highway Collision Investigation Squad is investigating the incident.