I have run minion and high roller in single ply with no problem. I am running Larsen TT and advantage in single ply with hassle. I also run big bettys with issue. All these tires come in under 850g I think. The time I hand trouble was with the single ply rear getting a side wall puncture from sharp rocks on my back yard DH run. Changed to the bettys for no weight gain and no problems since. For normal rocky sections single have been fine, these one are just sharp and stick into the trail and awkward angles literally stabbing the wheelset.