Early days - above and below, a two page advertisement featured in "Look-In" magazine, 13/12/1980. THE RACE IS ON BMX is the bike-racing sport that has swept across America. The action-packed event that's tougher, faster and more exciting than anything you've ever seen before. Now Puch Murray and Halfords bring BMX to Britain. And there's never been a better time to take off with a brand-new sport. Bicycle Motocross is no place for toy bikes or tame riding. You race on a dirt-track downhill…