He was cycling in a group when the incident occurred at Ballywilliam shortly before 1pm Irish time.
The man was treated by emergency services but was pronounced dead at the scene a short time later.
Diversions were in place to allow for a technical examination by Garda Forensic Collision Investigators.
Gardaí are appealing for witnesses to come forward and to those with camera footage, including dash-cam, to make it available to them.
Anyone with information is asked to contact New Ross Garda Station 051 426030, the Garda Confidential Line on 1800 666 111, or any garda station.
