Neither: Toss them all and get five--not four--new ones.
Nice work. Did you put talc on the tubes?
Finally 1 vote to keep the old tires, this is what I was wanting to hear two weeks ago before I bought all new tires. But you are only one out of about 20 people who said keep the old tires.I have had over 100 cars & trucks and many of them very old. My personal opinion is the tire companies want you to replace tires as often as possible. I am still using some tires 30 or 40 years old without a problem, but I don't go very fast on crowded freeways with them. I know most of you will not agree with this.