A couple years ago after I sold my FS MTB, I was shopping for something else used. I came across a single speed mountain bike and I was really intrigued. It sold before I could get it, but I haven't forgotten it. I went on to get a decent mountain bike, but still think about having a sigle speed for simplicity/fun. I'm always picking up free bikes and a few days ago I got a Trek 7100 hybrid/comfort bike. The bike was rough, lots of stuff bent and damage, but the frame is straight, clean, and super beefy. Here it is how I found it: As I was tearing it down yesterday I kept thinking it would be a great single speed, great frame, large diameter tubing, after I removed the suspension seat post, and threw away the street shock, and removed almost everything else, this is what I will be starting with: I can see my first issue will be the vertical drop outs, but the bike I saw had a rear mounted chain tensioner, it looked like a derailer, but with just 1 cog. I have a set of 26" Araya MTB wheels I will be using, and I have a couple new BMX freewheels I can choose from to put on there, so wheels are covered. I have plenty of stems and bars, might have to source a seatpost or cut the suspension one, but that's not a big deal. As for a fork, I'd like to go suspension, nothing fancy, but something made for MTB, needs to be a 11/8 threaded based on what else I have to work with, but if I can't find anything cheap to free then I do have an old rigid Tange fork I think I can use. The paint is pretty on this bike, but after all the mismatched parts I will be ratting it out a little. so some rattlecan is in order.