I now feel vibrations after a recent tire change. What can be causing this?

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I recently had a flat tire. I changed the tire,now I can feel the car vibrating especially at higher speeds. I had no issues prior to the tire change. I checked to make sure that all the tires were the same size and sure enough all four say 170/225/r14. Trying not to drive but this is my only vehicle and i need it to get back and forth to work. This vibrates only when driving cannot feel anything when stopped