02 alero rear struts rub tires - 2002 Oldsmobile Alero

SOURCE: 2001 Pontiac Grand Am SE rear tires and struts scraping

struts frozen or not will not control how close the tires are to the strut. The tire and lower portion of the strut move of one. The compresson/rebound point is about the strut base

SOURCE: rear strut almost rubs tire

It can be a bent strut or just an alignment issue.
first if you can put the car on a left or jack stands(on the rear but not on the suspention) you can then loosen the 2 bolts at the bottom of the strut at this point you can move the top of the wheel out. then tighten the bolts lower the car and see if that moved the wheel enough. is it did get an alignment and if not replace the strut.

SOURCE: Will the tire size 235/40/R18 fit on my 2000 Oldsmobile Alero?

Take your Alero to any reputable tire dealer and they will assist you in hopes of selling you something. Just tell them you want an estimate and that you want to be sure you won't have a rubbing problem with this change.

SOURCE: tire shop says tire wear is due to bad rear struts

you need to replace only the shock cartridges.  Also have the tires rebalanced.
When you receive advice from this website you have to understand that without the item in front of us, we are only able to provide "a best guess" as to what the problem might be based on you description of the defect.  If you haven't described a clear and precise description of the defect you decrease the chances of an accurate reply.  Thank you. 

SOURCE: My back tires are rubbing

There are a couple of things that can cause this. worn parts used for aligning the rear wheels can cause it (they're kinda like tie rods, but don't tie the wheels together) or, the wheel bearings are going out. neither are extremely expensive, but are very important. The wheel bearings are the most likely, as they will allow the tops of the tires to tilt towards the inside. Jack up your car so that the rear wheels are off the ground. Can you make the wheel wobble all directions(even if only a small bit)? If so, then you need to change those rear wheel bearings.