CST (Cheng Shin Tire) C-740 Road tire Wire Bead 700 x 28 All Black. CST - Cheng Shin Tire C-740 Road tire Wire Bead 700 x 28 All Black. Great Valve Road Tire ! Tough & Long Tread Life ! Grooved Tread with Directional Siping for Wet Conditions. Weighs only 400g.s 100 PSI 27 TPI