The collision happened on the A6003 Stamford Road in Oakham, Rutland, at the roundabout with Burley Park Way at around 6pm on Thursday (March 20).
The rider of a black Triumph motorcycle - a man in his 20s - was pronounced dead at the scene.
No other vehicles are believed to have been involved in the incident, according to officers.
Leicestershire Police is appealing for witnesses and anyone with footage to come forward.
Detectives from the force's Serious Collision Investigation Unit (SCIU) say the family of the motorcyclist, who has not been named, has expressed their thanks to members of the public who stopped at the scene to provide first aid.
Police said they have already spoken to some witnesses, but are keen...