Hello I am Glenn Roberts new to this forum, as you can probably tell, I used to race all through the 70's mostly on a special monoshock framed Triumph Trident. Recently I purchased a 1984 TZ250 Juchem Yamaha, through the person I purchased from we have found out this was the very bike that had the Juchem chassis made especially for Martin Wimmer. When he finished with it it was sold to Bernd Steif. I am trying to find a way to contact either of these gentleman, can anyone help please?