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I have installed 100's of tires on every type wheel and/or style motorcycle and if you are fighting to mount/dismount the tire you are doing it wrong. Its not NoMar or any other tire machines fault, its your technique.
I've never needed more than 40-50 PSI to seat a tire. As I recall my Pirelli Scorpion tire installation on my Griso went very smoothly. Perhaps you gouged the rim enough to cause a problem. Check the shoulders and get a little more lube on before trying to seat the tire again. That said, I've seen others reporting bad tires so you may well have a defect on your hands.
Put the tools down, take a break and come back at it with a fresh set of eyes, always helps me when I'm stuck and frustrated. It'll come, good luck and stay safe
where as the new one says, "Made in China," so who knows if it's even round?
All great if you want to pay the premium. I get tires 40 to 60% less than what local dealers charge and an hour of my labor to change them at my convenience. My tire machine has paid for itself 10X over.
I have a box that has a piece of glass on one side . Placing the tyre in the box and setting it in the Sun for the solar gain results in a nicely warmed tyre. then use the zip tie method to mount the tyre over the rim . Warmed up and stretched slightly , the tyre almost seats its self . Dusty
I'll give it rest for now. Ordered one of those "clip-lock" air chucks which will certainly help. I do think the tire might be a bit undersized. The bead seats about two-thirds of the way around on both side of the tire, but the remaining bead just pulls down tight into the drop center and won't budge. It's a 120/70-17, but one would swear it's too small by the fight it's giving me.