"28 inches" could be a 700C tire/tube, ISO622mm (an oddball designation for a common size) or a British roadster tire/tube, ISO635mm (a rare but not unknown size in the USA).
tcs
Note to tcs: I misinterpreted your posting in my reply above this one. You were calling the 28" designation odd-ball, not the 622 ISO size designation, Sorry, I didn't mean to insult your interpretation since I agree that there are so many odd-ball names for what is basically the same thing. Thank God for ETRTO/ISO