the shimano tourney 7 speed stuff is 14t high gear. oh crap, its FREEWHEEL?!? ahh, but there's an 11-28T 7 speed, the MF-HG50
http://techdocs.shimano.com/media/te...9830612546.pdf

I can't seem to find those in anyones catalog, however, only this 13-28t 7 speed
http://www.amazon.com/Shimano-MF-HG3...=Shimano+MF-HG

here's a noname 11-30 7spd.
http://www.amazon.com/DNP-Epoch-Free...peed+freewheel

best of luck. not the warnings about requiring a special freewheel tool.