Do I need to balance my wheels when I change tires?

I have a set of wheels that have on my car, I am in the process of purchasing new tires. Do I need to balance the tires once the new tires are installed?Do I need to balance my wheels when I change tires?
always
When you purchase new tires at a store and they are mounted for you the mechanic should always balance your tires before putting them on your car.

Watch him to make sure this is done. If he's lazy or in a hurry and starts mounting your new tires without balancing stop him and tell him he needs to balance them first.Do I need to balance my wheels when I change tires?
Yes. Possible even you may need the aligned again as well.
that should be a part of the tire installation process.Do I need to balance my wheels when I change tires?
just asked my mechanic fiance....answer yes! or you will get vibration