Yeah i doubt i could pinch a super thick tube though they often weigh 30oz + which is twice my tire.
yeah… i put the tube in my trials and inflated it to 3/4 or so the size of the tire and i could ride it and not pinch it.
I’ve pinch platted a Primo Wall tire at 55psi… 
Bad landing off a 5 set. (On a bike) I’m about 160 pounds.
2.80 was done by Peter VB in 2006 at the NZ unicycle Weekend. As Peter said, its the biggest done under official IUF rules and conditions. I cant wait for the results form the uninats as peter vb and joe dyson are going to be there, i think either of them could beat the record
Dan