I just purchased a Schwinn Sprint for my wife. I believe it is an '85 model according to the stamp on the rear forks (G0385). The frame looks good, with a small amount of rust. I need to get some new tubes and tires for it, but they are so worn down that I can not tell what sizes I need. The rim says 24x 1 1/4". Does anyone know what size tubes and tires I should purchase? I appreciate any help.