North Yorkshire Police say that it happened in Cropton near Pickering on Saturday, April 20
At about 3pm, three men were riding mountain bikes near Cropton Forest when a confrontation took place.
The victim, local resident Alan Cummings, was punched to the head and face by one of the men.
A police spokesman said: "The man who assaulted the victim is described as white, aged in his late 40s or 50, about 5ft 6ins tall, of muscular build with broad shoulders, with a bit of a ginger beard, and possibly tattoos. He was wearing bright-coloured designer mountain bike gear and was riding a yellow bike.
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