Boyfriend has them, loves them. He's a jerk, doesn't have to set his tire pressure before a race. Doesn't flat out (I got a DNF at Idaho ISDE qualifier day two because of a flat so I'm a little bitter). They are more difficult to install than a tube (naturally) but a stand will help.
I'm not 100% that you can use the tire balls with the trials tire though because they're a different size of tire... You might look around in Thumpertalk or KTMtalk if no one else here has experience with that combo.
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