I go through a few low-end tires over the summer on each of my bikes. I found my tires lasting much longer after learning to skid ambidextrously (because you aren't always skidding the same part of the tire when you alternate). Just bought a 'skidproof' tire/tube combo (I know they are not authentically skid proof but they are more durable, apparently) and it has been treating me well for about a month..