A 28-year-old man suffered a broken arm after he was knocked off his bike by a hit and run driver.
The incident happened along the A17 between Kirkby le Thorpe and Heckington at around 7.30am on Saturday, January 2.
The cyclist from Sleaford was knocked off his bike and the driver failed to stop, police said.
The cyclist suffered a broken arm in the incident and is currently being treated at Boston Pilgrim hospital.
Police said he is likely to be detained in hospital overnight.
There is no description of the vehicle involved at this stage.
Any witnesses or anyone with information about the vehicle and/or the driver involved is asked to contact Lincolnshire Police on the 101 non-emergency number quoting incident 51 of 2/1/16.
Alternatively they can call Crimestoppers anonymously on 0800 555111.