I bought a boxtop bike from WalMart; a GMC Denali by Kent. It has Kenda tires with pretty yellow stripes on the sides. There is actually some tread on them. I want to commute to/from work. I don't like flats. I bought some Slime tire liners to try to get some wear out of the Kenda 700c tires while avoiding flats. While installing the first one, I took my veteran diaper clip and stuck it through the Slime liner 2x. No problem. Am I just stupid or is this a gimmick for-which I paid 14.50/pr.?