A 47-year-old cyclist was smacked in the face three times in the horrific daytime incident, which was captured on CCTV.
Detectives investigating the assault in Barking, east London, have released the footage of the October 4 incident, in a bid to try to trace the driver of a silver Audi A4.
The cyclist spoke to the driver as he had narrowly escaped being clipped, but according to police the driver took offence before landing three massive blows on the side of his head.
A spokesperson for the Met Police said: “As the suspect got out of his car, the victim approached him and asked why he was driving in such a way.
“The suspect then went into the shop. The victim remained outside waiting to speak to the motorist.