My pool cleaner wasn't moving very well and I was seeing tire wear so I ordered these replacements. Great price, quick delivery, easy installation. I was expecting an improvement but WOW! as if the whole block was new! As an engineer, I was curious as to why this improved things so much. What I've found is that as the old wheels wear out, neither the front fascia nor the rear fender slide on the underbody as intended because the gap becomes too small. In addition, the device itself begins toβ¦