A group of motorcyclists have attacked a 59-year-old man out for a morning cycle in western Sydney.

The bikers rode up next to the cyclist on Saturday as he was riding up The Northern Road in Luddenham. As they drew close one of them kicked him in the leg, toppling the cyclist.

The bikers did not stop to assist the injured man before riding off in the direction of Penrith.

The cyclist suffered cuts to his face and body. The bikers did not stop to assist the injured man before riding off in the direction of Penrith.

Police are appealing for information about the incident as they continue to search for the group of motorcyclists, particularly from drivers who may have been in the area.

They have been described as being dressed in black clothing and riding black Harley Davidson motorbikes with chrome-coloured handlebars.

Police have urged anyone who may have witnessed the incident to contact Crime Stoppers.