"The Creepy Crawler rear trials tire provides discerning riders with ultimate control for edging, smearing and all around trials dominance." (^^^ quote from http://www.maxxis.com/products/bicycle/product_detail.asp?id=303 ) Edging? Smearing? Is edging and smearing something I already do, and just don't know what to call it? Is it some secret euro thing that I need to learn?