My initial flat problems occurred right after I got the bike 1 year ago, probably due to pinch flats. I sometimes let the 700x25s get down close to 70 psi not realizing the problem I was causing. Keep in mind that before purchasing this bike I never had a tire much smaller than a 38mm. I ran thick bottomed, thorn proof tubes for about 6 months without a flat. I probably was only averaging 15 to 30 miles a week as I only did rides as substitutes for gym aerobics workouts. I doubt that these tires had 1000 miles on them - now they are in the garbage can!