Intense MK2 Micro Knobby Folding Tire Intense MK2 20 x 1-3/8" (451 ISO) BMX Tire Aramid Bead/Folding All Black. The worlds #1 BMX tyre, has been improved with LSG material to reduce the overall weight, a new Drag Strip center ridge to get you rolling faster and decrease tire wear, all this matched with MicroKnobbys on the sides, the MK2 gives you our most advanced turning technology. The longer lasting MK2 tyre is not only the best value in BMX, it gives you ultimate traction and reduced rotational weight to help you go as fast as you can on the BMX track or trail. It features thousands of MicroKnobs, each having a ramped leading edge for the lowest rolling resistance possible. ISO Diamter: 451. ISO Width: 35mm. TPI: 72. PSI: 35 - 65 PSI. Weight: 250g.