one word of warning... im my experience ramped cogs out back are not to be trusted!

the chain will derail on you when you least want it too!

buy one of these! save you knees from slamming the bars when you pop out of gear on a steep climb.



and unlike what it says on the package, it will work on any shimano type hub.

oh, one more thing... the most singlspeed mtb advice i have found on the internet is over here:
http://forums.mtbr.com/forumdisplay.php?f=46

not that these guys here aren't lovely, just most of them ride fixed gear bikes on the mean streets.