Hi, thanks ladies. The psi is something loke 45-80 (I am awful with numbers, please bear with me... I thought 702 was 501 the other day). The pump is fine-- initially I thought that was the problem so I used a store's pump and the same thing happened. I don't know where the holes are happening because I started getting self-healing slime tubes (they don't work... slime just goes everywhere). But the tires explicitly state that they shouldn't carry more than 180lbs.