My Trek 7K has an ENO eccentric hub and its the jam. I love this frame and can rock 32-18 freewheel for the trails and a 15t cog fixed for the street.

My Rincon is in need of a new rear wheel and its getting a flip-flop hub to replace the shot, converted STX rear hub. No tensioner is needed because it has horizontal drop outs. It went from an entry level 7 spd mtb I bought when I was 13 to a killer SS bar bike in '99 and the frame is going strong 14 years later.

Look for old steel HTs, usually base models. Chances are they have horizontal drops and a bolt-on freewheel or 7sp cassette. Most are high-ten. steel but some are full 4130 chro-mo. Excluding the original purchase price in 1993, I built my Giant for around $70 including a Surly chainring and rear freehub cog, an old cassete for spacers, and a new chain.

Unfortunately I am sans camera at the moment, so I know, this post is worthless w/out pics

Craig