I had that same problem when I was running a detonator on the rear, going through like a tube a week. I never thought it was the tire that was doing it, however after I ran a thin strip of duct tape over the tire strip, the flats stopped happening. The Detonators do wear really well but you may want to spring the $35 for some gatorskins and all your tire problems will be solved. Also, 120 psi is way too high, you will probably be better off with half that