I restored and have been riding an '87 Bridgestone Radac but the gearing was intended for the Flat and alas, I live in the Mountains. I'm looking to swap out my original 600 MF-6208 6-speed 13-22 corncob for something with a little more range. Ideally I'm hoping to find 13-28 since I do like the 13t but it seems most of the Shimano freewheels I find online are 14 and up. My biggest question, though, is; what freewheels out there are compatible? I've seen Suntour and Shimano HyperGlide come up in searches and wonder if any of those would fit, also the crazy looking Shimano "Mega Range" with the big 34t on it.
If 14 is the lowest I can go then it's a sacrifice I'll have to make. With the grades I'm climbing, I just have to get a bit more range.