Around 4am a collision occurred on the A259 Grand Parade at the junction with Warrior Square between a Ford Focus and a pedal cyclist.
After colliding with the cycle the car continued for a short distance before stopping on the A259.
A number of men were seen to get out of the car and run away.
The 23-year old local man riding the cycle died at the scene.
Three men and a 17-year-old boy were later arrested all on suspicion of causing death by dangerous driving.
They were a 33-year old from Bexhill, a 24-year old from Hastings, a 24-year old from Bexhill, and a 17-year old from Bexhill
Two of them, the 33-year old from Bexhill and the 24-year old from Hastings, were also arrested on suspicion of driving while unfit through drunk or drugs.
The 24-year-old man from Bexhill was also arrested on suspicion of aggravated vehicle taking.
Sergeant Phil Duffy of the Sussex Road Policing Unit said: “Officers undertook detailed collision investigation work and the A259 was closed until lunchtime.
“We appreciate the patience of drivers whose journeys would have been delayed as a result.
“Any witnesses to the collision or to the Focus stopping afterwards are asked to contact us via [email protected] or by calling 101, quoting Operation Ashdon.”