Tube replacement
Jim,
Where are you located?
I am in the Dallas, TX area and have a little experience with tube/tire replacement on small wheels. Never plastic but I did just pickup a used i2 to experiment on.
If you are close I am happy to help.
If not close, you do not need to remove the tire to replace the tube. Use a couple woodworking clamps or a towel and big channel lock pliers to squeeze the tire and unseat it from the rim on both sides.
You should be able to push in the valve stem and pull the tube out using your fingers.
If you are willing to get that far I can document getting the tube in also
David
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