Vee Tire Co. Speedster BMX Tire: 20" x 1-3/8" Folding Bead Black Tread Red Honeycomb center tread provides added traction and increased speed with very low rolling resistance; large diamond shaped side knobs give extra grip and cornering control Large diamond shaped side knobs give extra grip and cornering control Low Specific Gravity Compound is lightweight and designed for high speed ISO Diameter: 451/ 20 x 1-1/8", 1-3/8" ISO Width: 37