Primo Comet 20 x 1.35" Black/Black Tire Primo Comet 20" x 1.35" Wire Bead/High Pressure Recumbent Tire Start off the season with new tires ! The Primo Comet Road Recumbent tire has a steel bead and rates at a max of 100 PSI. ISO Diameter: 406 ISO Width: 37 mm PSI: 100 PSI 27 TPI