sayang ang bagong gulong if you don't have it aligned, tsaka when you acquire 4 new tires, yun nga yung pinaka magandang time to have your car aligned kasi siguradong deretcho takbo nun. my experience before with old tires after alignment, hindi straight ang takbo so the mechanic kept rotating the tires until the car ran straight, sa gulong na daw kasi ang problem, might be the uneven thread wear