Police were called to the incident on Friday evening
The 31-year-old biker was taken to an east London hospital with serious injuries.
Police were called at approximately 10:50pm on Friday, 1 November to the incident on Lea Bridge Road, at the junction with Northumberland Road.
Officers and the London Ambulance Service attended.
The driver of the car stopped at the scene.
Anyone with information should call the Serious Collision Investigation Unit based in Chadwell Heath on 020 8597 4874 or via 101 quoting reference Cad 9432/01Nov.
There have been no arrests and enquiries continue.
Tags: Waltham Forest