Most riders favor one side on their slides. To help your edge wheels last longer, rotate them every so often. Identify your heel and toe edge wheels. To rotate your wheels properly you will need to cross the wheels in the shape of an X. This means that your rear heel edge wheel will now be your front toe edge. Your front heel edge wheel will become your rear toe side wheel, etc.
The center wheels normally do not need to be rotated often. If you do notice your rear center getting smaller than the front, switch them around to counter the wear.