20" HYDRA TIRESFEATURES: The new HYDRA tire uses "SPARK" technology, s new Electro Discharge Machined Traction System on the center strip offering unrivaled traction with low rolling resistance and makes these tires super squeeeeaaky!. We use two different file patterns on the tires edges to provide traction so you can lay the hammer down. 20 x 2. 30" LP HP INFLATED WIDTH: 2. 32" (59mm) INFLATED DIAMETER: 20. 7" (526mm) MAX PRESSURE: LP: 55 65PSI, HP: 80 110 psi