im trying to figure out what size tires fit some old road bikes ive come upon one is a old huffy omni 10 speed the others are free spirits ive found 4 of them i could possibly get going and i wanna put some tires on one of them but every single one of them has the tires rotted off so bad i cant find a size lol its really pitiful anywho ive never ridden a road bike before and am ready to give it a shot anywho i put one tire up next to a 26 inch wheel and it was bigger then it maybe its a 700c or 27 inch... 28 ???? someone please tell me so i dont have to buy several tires lol