A highly versatile front and rear race tire option that strikes a balance between speed and control with Tioga's GripPod technology and Nano Knob tread design. Features: Low profile race tire with ultra-smooth centerline and pressure sensitive side tread that increases corner traction when pushed to the limits Special chemical surface etching applied to center tread creates fine surface texture that enhance traction on wider variety of track surfaces Nano knobs in varying angles, shapes, and sizes strategically integrated within the outer tread zones provide additional traction on track surfaces with loose fine grains Minimal rolling resistance without negatively affecting corner grip Specifications:Bead: WireWeight: 12 oz (20 x 1.75")TPI: 60tpiColor: Black The FASTR-X is our most versatile race tire to date. Increased strategical placement of Grip-Pods matched to multi-facet Nano Knobs on shoulder and sides, capped off with friction enhancing chemical etching over the central tread, FASTR-X strikes the rarefied balance of speed and control like none before. Material:Cyclex 120 TPI Ultralight CasingUTC Rubber CompoundFolding Bead Weight:20 x 1.75: 300g; 10.58 Oz20 x 1.60: 280g; 9.88 Oz20 x 1-3/8: 270g; 9.52 Oz20 x 1-1/8: 225g; 7.93 Oz