dont bother.. crackheads will steal any bike and real thieves woudn't steal a walmart bike no matter if it's SS or not
to do it ultra-cheap, if you are lucky, one of the existing chainrings and cogs will give you the "magic ratio" that you need. if you can get a magic gear ratio, all you will need is a chain breaker and tools to remove the shifters.
otherwise you will probably have to buy new chainring and or cog and it will be too expensive to justify doing
why do you want to SS it? just to do it? honestly mickey_'s advice is the best
and converting to single speed will not give you a fixed gear bike...
Last edited by frantik; 04-12-11 at 03:14 AM.