Funny, I had a similar conversation with another rider last year discussing what is "vintage"...at a time when (depending on the series) many twin-shock bikes are considered not. When I first started riding twinshock/vintage events in the mid eighties, my Honda TL was only ten years old. The "old" British bikes riding around then were often newer at the time then early air cooled monoshocks are today! Ironically it was the arrival of those latter bikes that changed the sport and preciptated that twinshock series way back...as a glut of bikes from the 1970's trials "boom" suddenly became uncompetitve. Maybe things are starting to come full circle? Good to see the older monos starting to get a little more love out there!