I've picked up an old mountain bike to be my winter commuter that I'd guess is from sometime in the 90s (grip shift, non-cartridge BB, quill stem, etc.). This bike has a set of 26 inch wheels with formula hubs - and I'm sure they aren't the best hubs because this is a pretty low-end bike. The cones aren't in the best shape (one is pretty bad). I'd like to replace them but wouldn't even know where to start finding cones for these hubs. Could I replace with any old cones for MTBs? I'm not sure how much difference there is between cones. Even if it isn't perfect, I'd imagine it still be better than the old cones in there. If I can, I'd prefer not to replace the wheels, which are otherwise fine. Any thoughts?