On Friday September 29 at 6pm roads policing officers attended Rivelin Valley Road, between Hollins Lane and Hagg Hill in Sheffield for reports of a crash involving a car and 55-year-old man on a bike.
A white coloured Mazda 3 was travelling towards Sheffield when it collided with a 55-year-old cyclist travelling in the opposite direction, police said.
The victim was taken to hospital with serious injuries and remains in a life-threatening condition.
The driver of the Mazda, a 31-year-old man, is assisting officers with their enquiries.
A spokesperson for South Yorkshire Police said: “We’re keen to hear from anyone who witnessed the collision or may have dashcam footage of the Mazda prior to the collision, between the junction of Manchester Road and Malinbridge.”