A new culture of young, inner city bikers has grown up over the past years in the UK. Young men and women have taken to the streets on dirt bikes, quads and all manner of motorbikes to perform stunts. Often hidden in the mazes of industrial estates, where they won't draw too much attention from the public or police, riders gather on weekends and perform tricks up and down a strip of tarmac. Photographer Spencer Murphy, who is continually interested in people who exist on the fringes of law and society, spent two years documenting these gangs of riders and quad bikes.