Yeti SnowMX SkagDescription YETI SnowMX ski skag (aka skeg carbide runner wear bar). Inspect Replace notes: You should visually inspect your skag every couple rides or so. I would suggest it should be replaced if there is less than 1 8" (3mm) or so left of the vertical steel edges, for both handling reasons and safety reasons a worn skag can contribute to a loss of control on the trail ride back to the truck. Depending on the amount of trail riding you do and the