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Getting the tire past this, mounting and dismounting, is the hassle with ATV tire changing. They do work very well.
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When taking a tire off the rim or putting it on the first big problem is the bead, stuck, rusted, etc. Seating the bead to hold air is the second hardest (soapy water helps). But when putting the tire on or off most people let the tire bead lay on the rim when they are trying to pry on the top bead (with the tire laying flat on the ground that is). If you keep the beads in the center of the rim(center has a smaller diameter than the outter bead portion), you can almost put the tire on by hand. Same with bike tires and everything. It took me 40 years to learn and remember this, but when I see someone fighting with a tire it's always a pleasure to help. /forums/images/graemlins/grin.gif