Chief Superintendent Anwyl said most biker deaths were avoidable
The number of motorcyclists killed on the roads of north Wales this year is the highest number ever recorded.
North Wales Police Chief Superintendent Geraint Anwyl said the number of motor bikers who have died so far this year is 18.
In nine-out-of-10 cases it was the riders themselves who were responsible for their own deaths, he said.
"The overwhelming number of riders killed are white men, aged 35 or over, living in north west England or the Midlands, who die on left-handed bends," he said.
He added that statistics show the majority drive high-powered machines and are likely to die on a Sunday afternoon when the weather is sunny.
Chief Superintendent Anwyl said: "Many of them are 'born again bikers' with inappropriate skills who've got more cash and bought themselves powerful motorcycles.
"They haven't got the skills to get themselves out of trouble."
He said: "I would advise anyone considering going back to biking to sign back up for some training from the many courses available."
"What makes it even more tragic is that these accidents are avoidable."
Chief Superintendent Anwyl said most accidents happened on unrestricted country roads and a particular black spot was the Padog bend near Corwen.
"It is not just a serious problem in north Wales and the Dyfed-Powys area has had a significant increase."
The number of motorbike deaths in north Wales last year was seven and the figure was ten in 2001.
In June, Alyn and Deeside MP Mark Tami called for warning signs to be put up for bikers and said many roads had become known as notorious black spots.