Detective Sergeant Smith said police do not know the exact cause of the man's death at this stage, and they want to hear from anyone in the area about 1am.
The intersections between Victoria and Abbotsford, Victoria and Edgecumbe, Edgecumbe and Dyer Streets and the intersection of Victoria St and the Fairfield Bridge for traffic turning left into the city are likely to be closed for several hours.
Mr Smith said while the person's death is tragic, it is also a timely reminder for cyclists to always wear a helmet and have lights and reflectors on their bikes.
Anyone with any information on the incident should contact the Hamilton Central Police Station on 07 858 6200.
- Herald Online staff