SIPING is done by placing your tires (new or used) on a specially
designed machine that rotates your tires while making small virtually
invisible 90 degree cuts in your tread. Don't be alarmed! Although
the process is actually cutting your tread, it doesn't harm your
tire in any way, it improves on it. Only under very close inspection
can the SIPES even be seen, and you're more likely to tell by your
improved driving experience than by visual inspection. Show
me a video. You may be wondering if SIPING can weaken your tread
see this animated
presentation designed to answer this question.