Kenda Kid Block 20x2.1 Tire Wire SRC BlackThe Kenda Kid Block 20x2.1 Tire uses a micro knurled block style tread that extends onto the upper sidewall with a fast rolling center line. Additionally, the knurled block-shaped non-directional design benefits both acceleration and traction. The Standard Rubber Compound, or SRC, combines the best attributes of low rolling resistance, extreme durability and tread longevity. The 4 Ply Casing gives a robust durable tire and reduced chance of flats from pinches and punctures. This its is best between 40-60 PSI and has 60 TPI. Weighs around 670g. Available in Black.047853608298