The only real problem I have with mounting mini bike tires is when it is a split rim, you know, a right and a left piece that bolt together. I'm kinda like jordan, tire spoons don't scare me, so solid rims are O.K. by me. But the split rims tend to pinch the tube when the bolts are being pulled up. I have a pair of plywood pieces that have appropiately sized holes in them that, when C clamped on the tire/rim pushes the two tire beads together on one rim half. Then the bolts can be tightened without pinching the tube between the rim halfs. Does anyone have a better method?