There is a discussion on trials central twinshock page about if you can run a tubeless rear tire on a twinshock rim with a tube. Some say it is impossible on a Yam TY as the tire will not stay seated at low psi. I am on my 2nd "hand me down" Michelin X-11's on my Ty250 twinshock and have never had any problem even psi. so low i can hardly get a reading. i normally run at 4 lbs Anyone else have an opinion on this or am I missing something?