Cheng Shin C1218 Street Tire, 26 x 2.125" Wire Bead All Black. Cheng Shin C1218 Street Tire, 26 x 2.125" Wire Bead All Black. Great Street/Urban tire for MTB, Fixies and Cruisers. Thick Heavy, Long Lasting Tread with Deep Siping Grooves Perfect for Commuting or Cruising ! ISO 559 / 26". ISO 53mm / 2.125". PSI 45-65 . This also comes in all Red and all Blue !