It was a case of road rage on two wheels this week as a squadron of cyclists assaulted a motorist in Fitzroy.

The melee began on Tuesday in Mater Street, Collingwood, with a verbal altercation between the driver and four male cyclists and continued to the southern side of the intersection of Brunswick Street and Alexandra Parade in Fitzroy.

Police say the bicycles were similar in design to a BMX. Credit:Kylie Pitt

As the motorist waited at the traffic lights, two of the cyclists from the initial group approached his vehicle.



One of the men produced what police say was a metal bike lock and started hitting the car, shattering the windscreen.



He then started hitting the driver's side window, which also shattered and caved in.



The two men then rode off east down Alexandra Parade.



The driver was not injured during the incident.



Northcote police are investigating the assault and are keen to speak with anyone who witnessed the incident.



Police say the male cyclist who attacked the car is Caucasian, with long hair, a beard and a missing front tooth.



The bicycles are similar in design to the Australian childhood favourite, the BMX.



Anyone who witnessed the incident or with any information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential crime report at www.crimestoppersvic.com.au.