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Creating a spare tire

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I see their are spare tires you can purchase from Modern Spare for around $400-500.

However, if I wanted to create a more affordable spare for travel use, how could I do this. I currently have a setup with induction rims. Could I purchase 18" rims and tires with sidewalls tall enough to make the 20" profile of the other wheels and tires? If so, how would I go about measuring and making sure they'd be similar in size?