You need, large tyre levers (3), washing up liquid and two people. I take it you have removed the motor from the wheel.
Put the tyre and tube on the wheel. Spread the washing up liquid around the side of the tyre and push as much onto the wheel as you can. Whilst holding that in place have another person start feeding the tyre on with the tyre levers. When near completion you have to use brute force to get the last bit on.
Replaced loads at work so hopefully this will help you. Don’t use pushbike levers as you don’t get enough leverage, you need ones at least 12 inches long. Try not to pinch the tube.
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