The Tioga Powerblock S-Spec tire is a lightweight race tire with low profile directional side lugs for excellent cornering on hard pack surfaces, smooth center tread for less rolling resistance and a Cyclex casing with Kevlar bead to help save weight.Folding Bead. FEATURES:Center band with textured blocks Lateral crampons notched and textured at 45 Textured sidewalls CYLEX 120 TPI Ultralight Casing Soft UTC Rubber Compound Usage: BMX Race Rear use Bead: Foldable TPI: 120 Weight: 310g (20×1.75) MORE DESCRIPTION Weight:20 x 2.1 :11.64oz; 330g20 x 1.95 :10.76oz; 305g20 x 1.75 :10.05oz; 285g20 x 1.60 :8.47oz; 240g20 x 1-3/8 :8.99oz; 255g20 x 1-1/8…