I have a pair of N50-15 meats from the 80's that I have mounted on 15 x 10 centerlines that I drive on. if you see any separation or dry rot at the bead, wall or in the footprint, then toss them. but you have to have air in them to see it. I have used a bunch of tires that were 7 , 8 even 10 years old not including the N50's. you have to look over them real good while inflated.
