Intense Micro Knobby 24" x 1-1/8" (ISO 520) Aramid Bead/Folding BMX Tire. Intense Micro Knobby 24" x 1-1/8" (ISO 520) Aramid Bead/Folding BMX Tire. The Intense Micro Knobby tires have a smaller tread pattern for more control on hardpack conditions. 5000 Knobbies per tire. Ramped for fast rolling. Directional low knobs for fast hardpack conditions. C3 race rubber compound. Weight = 220 Grams.