Three rows of longitudinal tread lugs, arranged in a directional V design to maximize traction on ice, snow and soft terrain The triangle arrangement of the studs makes the tire stable and maximizes traction for confident riding in all conditions 26x4.0 has 152 spikes while the 29x2.8 has 220 spikes Studs have a tungsten alloy tip with zinc plated steel base for longevity Studded 26x4.0 559 TBLS - Fold Bk/Blk 20 1404 120 60/68a No 152UPC/EAN/GTIN: 6927116116064