So a couple years ago, I got a wally world 18 speed Roadmaster MTB. I know. Anyway, within the first 20 miles, I totaled the rear wheel, and threw on a rather nice wheel that I got from a biking-friend (used it on my past 4 MTB's, along with the front...). Not too sure of the make anymore of that particular wheel. Regardless, it's got a Shimano 6 speed freewheel (with a quickrelease axle), and I can't even use 1st gear, because it's too steep (the derailleur cogs hit the gear in 1st). So, I was thinking, would it be a decent bike to make into a single speed? I've already upgraded the brakes, the shifting mechanism is garbage, and it's pretty solid, for what it is...

Also, what would be the easiest way to do this - DIY spacers, or buying one of those kits online?

BTw, it would probably get the gears of a BMX bike, if I went the DIY route...