hi,
I have actually ran some down to the core, some tires have kevlar belts and will not be a problem,
cheeper tires seem to have numerous flats, I only ride on folding tires because I have trouble with wire beads when I am on the road and need to change.
I recently tried some Serfas folding very resonable priced very durable, they are a little heavier than my high end tires but they seem to wear very well, no flats to date with the serfas belted tires. not sure if I spelled it right.
some guy on ebay sold me 2 plus tubes and wheel tape for the price of one folding at my LBS, I ve been riding the heck out of the back one and it still looks new.
Doug
here's the ones I like I believe i only paid 40.00 for two with tubes and tape free shippin on BBAy.
http://www.serfas.com/product_details.asp?ID=248