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The Mainline is S&Ms trail tire. Available in wire bead only with a mid weight high pressure casing. The 2.1 has a micro knurled surface on a directional tread designed to go on the rear. It features a center tread with a V-notched edge for accelerating and a flat edge for braking. The 2.425 front tire size is a nod to the old 2.125 Comp III we grew up riding in the front. Additional angular raised sections on three rows of knobs help keep the larger Mainline in front.