Three rows of longitudinal tread lugs, arranged in a directional V design to maximize traction on ice, snow and soft terrainThe triangle arrangement of the studs makes the tire stable and maximizes traction for confident riding in all conditions26x4.0 has 152 spikes while the 29x2.8 has 220 spikesStuds have a tungsten alloy tip with zinc plated steel base for longevityStudded29x2.8622WireBk/Blk3511866068aNo220