Can I put 15-17 inch tires on a car that previously had 14 inch tires?

That idea makes no sense. The rims are too big for the tires and the small tires would never hold air, or even stay on the rims. With bigger rims, you'd need bigger tires, but ones with lower profile so they don't jamb up inside the fenders.

Save your money for something else that isn't such a waste. The lower the profile of the tire the harsher the ride. You said, "So please help".

I'm trying to help you not do something stupid.

Use some common sense here. Obviously you need to get bigger tires 17" tires to be exact.

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