The Rubber Manufacturers Association, or RMA, maintains specifications which, if met, designate tires as approved for use in snow and mud. These specifications have to do with the spacing, depth, and width of tread in the tire, as well as the resulting amount of surface area that's in contact with the road. Luckily, you don't need to learn the specifics about the snow and mud designation, because tires that meet the specification bear an emblem on their tire wall that reads "S+M", "S/M", "M+S" or "M/S". Just look for the emblem or ask Adirondack Tire for tires that are snow and mud rated.










