BTW. if you haven't tried yet, the tubless X-Lights holds on the standard Acront rims pretty well, (with an additional tube), even in very rocky terrain and low air pressure, (the pic shows the "autobahn" part during the trip).
What do you mean with an additional tube? Do you wrap another tube around the other? So far I have not been able to keep a tubeless type tire beaded all the way around the akron rim on my Bultaco.
2010 Montesa 4RT, 1972 Bultaco Sherpa T 250, 00' Kawasaki Super Sherpa 250 (Wife's)