Originally Posted by jwc
couple of quick questions, but first a little background. My old Trek 400 is sitting in the shed, not being riden at all. I'm looking for a project and I thought...why not convert the Trek to SS? I've never done such a conversion, but I'm not afraid to give it a shot.
I know there are simple ways to convert a mulit-speed to a single-speed by reusing some of the original parts, but I'm really looking for something to do some tinkering on.

I also would like to keep the original setup intact in case I want to go back to multi setup.
First, how do I determine the best gearing for me? Take the Trek out as is and find a comfortable gear set up and start with that?
Any hints on parts that would work on this frame, but not kill me financially? I have to keep this on the cheap or the wife will have a fit. (I found a cheap conversion kit at Nashbar which I guess would be a starting point, then if I like riding SS, I could upgrade later).
I've been looking at parts at Harris Cyclery also, but don't want to start ordering parts until I know the basics of converting a bike to SS.
1. does it have horizontal drops? If so, its gonna be straightforward. If not, keep the deraileur on.
2. Is the rear a freewheel or cassette? If freewheel, buy a singlespeed freewheel and thread on. If cassette, go buy a single cassette cog and a bunch-0-spacers.
3. yes, find a comfortable gear and go with that.
4. 1., and 2. will work with the frame and not kill you financially (under 20 bucks). Dont spend money at Nashbar. You dont need a 'kit'.