I have a Schwinn "Sprint" and a ladies "World Tourist". Both sets of tires are like pototo chips! I need new ones all around. Suggestions? The Sprint has 27 X 1 1/4 sized what I believe are glued on lace up or tubeless (tubies?) and the W.T. has what appears to be regular tubee tires 27 Xx 1 3/8. I also ride a Mongoose and would like to get these old war horses rolling again. Where do I start for tires and can I do these myself?? AND, are they worth it??