Try dropping your tyre pressure down to 15 psi or so, and ride round on the tyre for ten minutes. Makes it warm and therefore softer and more pliable. Then take the wheel off and lay it on the ground, suitably padded to protect the hub and disc. Then stand on the tyre sidewalls with both feet, and try to break the bead with your bodyweight and boots. Dont worry, you won't buckle the wheel. The G clamp suggestion is a good one but they're heavy bits of equipment to lug around with you. You can use the sidestand of your bike instead...have fun(!)
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