. If you cannot find the items are looking for on site, our specialists will be more than happy to help parts require. Since the carbide is harder, it wears less and steel on sides wear a little more. If you have any questions or concerns about your purchase please... 000-00000 Snowtracker U-blade Carbide Runner 0.0(00.0% similar) Product must be in original package with tags, and new re-saleable condition 00 day return policy. If you have any questions about your tracking number or order, email us at . The runners always sharpens itself as you ride. 00 self-sharpening happens when the steel of runner wears... 000-00000 Snowtracker U-blade Carbide Runner 0.0(00.0% similar) This is especially so, when you cross roads and gravelly or paved areas. 