I have found that guys using tape to belt the tire are not having the problems with the foam tearing. It seems if the car diffs out and the tires expand the foam will let go because it cannot stretch. Taped tires stay flat and do not stretch so the foam does not tear. I'm going to grab a couple of sets where they have been used up to what condition they are in.
Regardless, we shouldn't have to tape the tire to get them to stay together.