The one problem though is that as far as I know, current 5 and 6 speed freewheels of any make (except perhaps the IRD ones) are only available in a 14-28 combination, with the exception of "MegaRange" freewheels that are 11-34 or 14-34, with a whopping 26 to 34 jump at the low end. None of the major wholesale sources list anything but these that I can see. Some 7 speed can be found with 13-28, and there is a SunRace 7 speed with 13-24. But if you want something out of the 14-28 norm, it's not going to be easy to find new.