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14 inch tires work on a 14 inch rim.
No!. It is very unsafe to mix tire and rim sizes.
14 inch
Brazilian vw beetles used 14 inch rim 4 lugs .
Probably not. The rim may not clear the brakes.
No.
yes
NoNo
You destroy the tire trying to stretch it around the rim.
Yes, as long as the 14" tire/wheel combination is the same diameter as the 15" you are removing.
No
Only if the bolt pattern is identical, and not generally a good practice.