Hi, I have just bought a bike a few days ago with 700c x 38 FV (Hybrid). My father pump it to about 40 psi (while it is recommended b/w 50-85 psi) and I took a ride. Then the next day, I tried to pump it to about 60 psi as I thought it would be alright and after a few minutes, the front tube exploded (nothing got into the tyre). So would you please tell me what the problem is? Should I stay below 40 psi or should I go to the recommended tyre pressure?