Borobike I don't know if I had a different freewheel on my older Denali but sunrace 12-28 does sound familiar. It didn't even have a lock ring, just a threaded top cog that screwed the whole thing down. Taking it off I used a vice grip and some chain, and it's reverse threaded. The Shimano 13-28 is what I replaced it with (I incorrectly said 26 or something like that earlier), and so far no complaints at all.

A forum member (I don't know if he wants to be anonymous so I won't say who) sold me his Denali bottom bracket when he upgraded (thanks btw), and not a moment too soon. My cranks had been flopping around for the last few days and when I pulled the bottom bracket out, my drive side bearings cage had completely disintegrated. So if anyone's keeping track, 10-12 thousand miles would be about the life-span of the stock bottom bracket, given no maintenance. Of course, I'll be greasing this one periodically.

BTW, I noticed that nfmisso is recommending the Mach1 EXE rear wheel and I thought I'd mention that I just a week ago replaced my front wheel with the matching Mach1. It isn't any lighter than the Denali wheel but for $28, not bad.