 For optimum winter traction performance, Cooper Tires Roadmaster brand has introduced the Roadmaster RM258 WDTM. Featuring an open shoulder design with four rows of lugs, the tire is Three-Peak Mountain Snowflake certified. Helping the tire achieve that rating are shoulder notches and chevron grooves for excellent bite in winter conditions. It was designed for regional applications, and comes in 11R22.5 and 11R24.5 sizes with load range H. 