At around 7.10pm on Tuesday 11 September a black VW Passat was driving along Trafford Road when it collided with a cyclist at the junction with Broadway.
The cyclist, an 18-year-old man, was thrown from his bike and remains in hospital with serious injuries.
The driver of the Passat remained at the scene to help officers with enquiries.
No arrests have been made so far.
PC Seamus Toal, from GMP’s Serious Collision Investigation Unit, said:
“The cyclist suffered multiple serious injuries and his family are under stably upset. We hope he makes a full recovery and our thoughts remain with them.
“Anyone who witnessed the collision, or believes they saw the cyclist and the car beforehand, is urged to get in touch.
“I’d also ask drivers to check their dash-cams to see if they have any footage on the incident.”
The Serious Collision Investigation Unit can be contacted on 0161 856 4741 quoting incident number 1781 of 11/09/18.